As filed with the Securities and Exchange Commission on September 15, 2004
                                                Registration No. 333-___________

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   ----------

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                   ----------

                           HEMISPHERX BIOPHARMA, INC.
             (Exact name of registrant as specified in its charter)

                                    Delaware
         (State or other jurisdiction of incorporation or organization)

                                   52-0845822
                      (I.R.S. Employer Identification No.)

                                   ----------

                               1617 JFK Boulevard
                        Philadelphia, Pennsylvania 19103
                                 (215) 988-0080

    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                                   ----------

                William A. Carter, M.D., Chief Executive Officer
                           Hemispherx Biopharma, Inc.
                               1617 JFK Boulevard
                        Philadelphia, Pennsylvania 19103
                                 (215) 988-0080

 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                        Copies of all communications to:
                              Richard Feiner, Esq.
                        Silverman Sclar Shin & Byrne PLLC
                        381 Park Avenue South, Suite 1601
                            New York, New York, 10016
                                 (212) 779-8600
                               Fax (212) 779-8858

Approximate date of proposed sale to the public: From time to time or at one
time after the effective date of this Registration Statement.




      If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

      If any of the securities being registered on this Form are to be offered
on a delayed or continuous basis pursuant to Rule 415 under the Securities Act
of 1933 ("Securities Act"), other than securities offered only in connection
with dividend or reinvestment plans, check the following box. [X]

      If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]

      If this form is a post-effective amendment filed pursuant to 462(c) under
the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering.[ ]

      If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

--------------------------------------------------------------------------------
                         CALCULATION OF REGISTRATION FEE



====================================================================================================================================
                                                                     Proposed Maximum       Proposed Maximum
Title of Each Class of Securities to be       Amount to be           Offering Price Per     Aggregate Offering      Amount of
Registered                                    Registered             Share(4)               Price                   Registration Fee
====================================================================================================================================

                                                                                                           
Common Stock                                  3,617,306(1)               $2.56                 $ 9,260,303             $1,173.28
====================================================================================================================================

Common Stock                                  1,085,193(2)(3)            $2.86                 $ 3,103,652             $  393.23
====================================================================================================================================

Common Stock                                    150,480(2)(3)            $2.08                 $   312,998             $   39.66
====================================================================================================================================

Total Registration Fee                                                                                                 $1,606.17
====================================================================================================================================



                                       ii


(1)   Represent shares owned by certain selling stockholders.

(2)   Represent shares issuable upon exercise of warrants owned by certain
      selling stockholders.

(3)   Pursuant to Rule 416 of the Securities Act of 1933, there are also being
      registered an indeterminate number of additional shares of common stock as
      may become offered, issuable or sold to prevent dilution resulting from
      stock splits, stock dividends or similar transactions.

(4)   Estimated solely for the purpose of computing the registration fee in
      accordance with Rules 457(c) of the Securities Act based on the closing
      price of the shares of common stock of the Registrant reported on the
      American Stock Exchange on September 8, 2004.

The Registrant hereby amends this registration statement on the date or dates as
may be necessary to delay its effective date until the Registrant shall file a
further amendment which specifically states that this registration statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933, as amended, or until the registration statement shall
become effective on a date as the Securities and Exchange Commission, acting
pursuant to said Section 8(a), may determine.


                                      iii


The information in this prospectus is not complete and may be amended. Neither
we nor the selling stockholders may sell these securities until the registration
statement filed with the Securities and Exchange Commission is effective. This
prospectus is not an offer to sell these securities and it is not soliciting an
offer to buy these securities in any state where an offer or sale is not
permitted.

                              Subject to Completion
                Preliminary Prospectus Dated September 15, 2004

                           HEMISPHERX BIOPHARMA, INC.

                        4,852,979 Shares of Common Stock

                                   ----------

The Offering:

      This prospectus covers 4,852,979 shares of common stock that may be
offered for resale by the selling stockholders named in on page 16 of this
prospectus and the persons to whom such selling stockholders may transfer their
shares. No securities are being offered or sold by us pursuant to this
prospectus. The selling stockholders acquired the common stock and the warrants
to purchase common stock directly from us in transactions exempt from the
registration requirements of federal and state securities laws. We will not
receive any of the proceeds from the sale of these shares by the selling
stockholders, but we will receive proceeds from the cash exercise of warrants,
if any.

      Our common stock is listed on the American Stock Exchange under the symbol
HEB. The reported last sale price on the American Stock Exchange on September
14, 2004 was $2.46.

      The selling stockholders may sell their shares from time to time on the
American Stock Exchange or otherwise, in one or more transactions at fixed
prices, at prevailing market prices at the time of sale or at prices negotiated
with purchasers. The selling stockholders will be responsible for any
commissions or discounts due to brokers or dealers. We will pay substantially
all expenses of registration of the shares covered by this prospectus.

                                   ----------

      Please see the risk factors beginning on page 3 to read about certain
factors you should consider before buying shares of common stock.

                                   ----------

      Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined that
this prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                The date of this prospectus is September __, 2004




                               PROSPECTUS SUMMARY

      This prospectus is part of a registration statement that we filed with the
Securities and Exchange Commission, or SEC, utilizing a "shelf" registration
statement. The selling stockholders may from time to time sell their shares of
our common stock in one or more transactions. This prospectus provides you with
a general description of the common stock being offered. You should read this
prospectus, including all documents incorporated herein by reference, together
with additional information described under the heading "Where You Can Find More
Information."

      The registration statement that contains this prospectus, including the
exhibits to the registration statement, contains additional information about us
and the securities being offered under this prospectus. You should read the
registration statement and the accompanying exhibits for further information.
The registration statement and exhibits can be read and are available to the
public over the Internet at the SEC's website at http://www.sec.gov as described
under the heading "Where You Can Find More Information."

About Hemispherx

      In the course of almost three decades, we have established a strong
foundation of laboratory, pre-clinical and clinical data with respect to the
development of nucleic acids to enhance the natural antiviral defense system of
the human body and the development of therapeutic products for the treatment of
chronic diseases. Our strategy is to obtain the required regulatory approvals
which will allow the progressive introduction of Ampligen(R) (our proprietary
drug) for treating Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome
("ME/CFS"), HIV, Hepatitis C ("HCV") and Hepatitis B ("HBV") in the U.S.,
Canada, Europe and Japan. We recently completed a phase III clinical trial in
the U.S. for use of Ampligen in treatment of ME/CFS and are in the process of
assembling and analyzing the obtained data preparatory to completing and filing
a New Drug Application("NDA") with the U.S. Food and Drug Administration("FDA").
We are also testing Ampligen in Phase IIb Clinical Trials in the U.S. for the
treatment of newly emerging multi-drug resistant HIV, and for the induction of
cell mediated immunity in HIV patients that are under control using potentially
toxic drug cocktails.

      Our proprietary drug technology utilizes specifically configured
ribonucleic acid ("RNA") and is protected by more than 250 patents worldwide,
with over 16 additional patent applications pending to provide further
proprietary protection in various international markets. Certain patents apply
to the use of Ampligen(R) alone and certain patents apply to the use of
Ampligen(R) in combination with certain other drugs. Some compositions of matter
patents pertain to other new RNA compounds, which have a similar mechanism of
action.

      In March 2003 we obtained from Interferon Sciences, Inc. ("ISI") all of
its raw materials, work-in-progress and finished product ALFERON N Injection(R),
together with a limited license to sell ALFERON N Injection(R), a natural alpha
interferon that has been approved for commercial sale for the intralesional
treatment of refractory or recurring external condylomata


                                       2


acuminata ("genital warts") in patients 18 years of age or older in the United
States. In March 2004, we acquired from ISI the balance of ISI's rights to its
product as well as ISI's production facility. We are marketing the ALFERON N
Injection(R) in the United States through sales facilitated via third party
agreements. Additionally, we intend to implement studies testing the efficacy of
ALFERON N Injection(R) in multiple sclerosis and other chronic viral diseases.
In this regard, the FDA recently authorized a Phase II clinical study designed
to investigate the activity and safety of Alferon LDO(R) in early stage HIV
positive patients.

      Our principal executive offices are located at One Penn Center, 1617 JFK
Boulevard, Philadelphia, Pennsylvania 19103, and its telephone number is
215-988-0080.

Securities Offered

      We are registering for resale by the selling stockholders 3,617,306 shares
of our common stock initially acquired directly from us in transactions exempt
from the registration requirements of federal and state securities laws. In
addition, we are registering for resale 1,235,673 shares of our common stock
issuable upon exercise of warrants outstanding on the date hereof. We are also
registering for resale any additional shares of common stock which may become
issuable by reason of any stock dividend, stock split, recapitalization or other
similar transaction effected without the receipt of consideration, which results
in an increase in the number of outstanding shares of our common stock.

                                  RISK FACTORS

                Special Note Regarding Forward-Looking Statements

      Certain statements in this prospectus constitute "forwarding-looking
statements" within the meaning of Section 27A of the Securities Act of 1933, as
amended, and Section 21E of the Securities and Exchange Act of 1995
(collectively, the "Reform Act"). Certain, but not necessarily all, of such
forward-looking statements can be identified by the use of forward-looking
terminology such as "believes," "expects," "may," "will," "should," or
"anticipates" or the negative thereof or other variations thereon or comparable
terminology, or by discussions of strategy that involve risks and uncertainties.
All statements other than statements of historical fact, included in this
prospectus regarding our financial position, business strategy and plans or
objectives for future operations are forward-looking statements. Without
limiting the broader description of forward-looking statements above, we
specifically note that statements regarding potential drugs, their potential
therapeutic effect, the possibility of obtaining regulatory approval, our
ability to manufacture and sell any products, market acceptance or our ability
to earn a profit from sales or licenses of any drugs or our ability to discover
new drugs in the future are all forward-looking in nature.

      Such forward-looking statements involve known and unknown risks,
uncertainties and other factors, including but not limited to, the risk factors
discussed below, which may cause the


                                       3


actual results, performance or achievements of Hemispherx and its subsidiaries
to be materially different from any future results, performance or achievements
expressed or implied by such forward-looking statements and other factors
referenced in this prospectus. We do not undertake and specifically decline any
obligation to publicly release the results of any revisions which may be made to
any forward-looking statement to reflect events or circumstances after the date
of such statements or to reflect the occurrence of anticipated or unanticipated
events.

      The following cautionary statements identify important factors that could
cause our actual result to differ materially from those projected in the
forward-looking statements made in this prospectus. Among the key factors that
have a direct bearing on our results of operations are:

No assurance of successful product development

      Ampligen(R) and related products. The development of Ampligen(R) and our
other related products is subject to a number of significant risks. Ampligen(R)
may be found to be ineffective or to have adverse side effects, fail to receive
necessary regulatory clearances, be difficult to manufacture on a commercial
scale, be uneconomical to market or be precluded from commercialization by
proprietary right of third parties. Our products are in various stages of
clinical and pre-clinical development and, require further clinical studies and
appropriate regulatory approval processes before any such products can be
marketed. We do not know when, if ever, Ampligen(R) or our other products will
be generally available for commercial sale for any indication. Generally, only a
small percentage of potential therapeutic products are eventually approved by
the U.S. Food and Drug Administration ("FDA") for commercial sale.

      ALFERON N Injection(R). Although ALFERON N Injection(R) is approved for
marketing in the United States for the intralesional treatment of refractory or
recurring external genital warts in patients 18 years of age or older, to date
it has not been approved for other indications. We face many of the risks
discussed above, with regard to developing this product for use to treat other
ailments such as multiple sclerosis and cancer.

      Our drug and related technologies are investigational and subject to
regulatory approval. If we are unable to obtain regulatory approval, our
operations will be significantly affected.

      All of our drugs and associated technologies other than ALFERON N
Injection(R) are investigational and must receive prior regulatory approval by
appropriate regulatory authorities for general use and are currently legally
available only through clinical trials with specified disorders. At present,
ALFERON N Injection(R) is only approved for the intralesional treatment of
refractory or recurring external genital warts in patients 18 years of age or
older. Use of ALFERON N Injection(R) for other indications will require
regulatory approval. In this regard, Interferon Sciences, Inc. ("ISI"), the
company from which we obtained our rights to ALFERON N Injection(R), conducted
clinical trials related to use of ALFERON N Injection(R) for treatment of HIV
and Hepatitis C. In both instances, the FDA determined that additional studies
were necessary in order to fully evaluate the efficacy of ALFERON N Injection(R)
in the treatment of


                                       4


HIV and Hepatitis C diseases. We have no obligation or immediate plans to
conduct these additional studies at this time.

      Our products, including Ampligen(R), are subject to extensive regulation
by numerous governmental authorities in the U.S. and other countries, including,
but not limited to, the FDA in the U.S., the Health Protection Branch ("HPB") of
Canada, and the European Medical Evaluation Agency ("EMEA") in Europe. Obtaining
regulatory approvals is a rigorous and lengthy process and requires the
expenditure of substantial resources. In order to obtain final regulatory
approval of a new drug, we must demonstrate to the satisfaction of the
regulatory agency that the product is safe and effective for its intended uses
and that we are capable of manufacturing the product to the applicable
regulatory standards. We require regulatory approval in order to market
Ampligen(R) or any other proposed product and receive product revenues or
royalties. We cannot assure you that Ampligen(R) will ultimately be demonstrated
to be safe or efficacious. In addition, while Ampligen(R) is authorized for use
in clinical trials in the United States and other countries, we cannot assure
you that additional clinical trial approvals will be authorized in the United
States or in other countries, in a timely fashion or at all, or that we will
complete these clinical trials. If Ampligen(R) or one of our other products does
not receive regulatory approval in the U.S. or elsewhere, our operations most
likely will be materially adversely affected.

We may continue to incur substantial losses and our future profitability is
uncertain.

      We began operations in 1966 and last reported net profit from 1985 through
1987. Since 1987, we have incurred substantial operating losses, as we pursued
our clinical trial effort and expanded our efforts in Europe. As of June 30,
2004 our accumulated deficit was approximately $127,841,000. We have not yet
generated significant revenues from our products and may incur substantial and
increased losses in the future. We cannot assure that we will ever achieve
significant revenues from product sales or become profitable. We require, and
will continue to require, the commitment of substantial resources to develop our
products. We cannot assure that our product development efforts will be
successfully completed or that required regulatory approvals will be obtained or
that any products will be manufactured and marketed successfully, or be
profitable.

We may require additional financing which may not be available.

      The development of our products will require the commitment of substantial
resources to conduct the time-consuming research, preclinical development, and
clinical trials that are necessary to bring pharmaceutical products to market.
As of June 30, 2004, we had approximately $9,433,000 in cash and cash
equivalents and short-term investments. We believe that these funds plus 1) the
gross proceeds received from the exercise of warrants and the Additional
Investment Rights of approximately $4,198,980 on July 13, 2004, 2) the gross
proceeds from the August 2004 Private Placement of equity securities on August
5, 2004 of approximately $7,500,000, 3) the projected net cash flow from the
sale of ALFERON N Injection(R) and 4) the proceeds from licensing agreements
should be sufficient to meet our operating cash requirements including debt
service for the next 24 months. We may need to raise additional funds through
additional equity


                                       5


or debt financing or from other sources in order to complete the necessary
clinical trials and the regulatory approval processes and begin commercializing
Ampligen(R) products. There can be no assurances that we will raise adequate
funds from these or other sources, which may have a material adverse effect on
our ability to develop our products.

We may not be profitable unless we can protect our patents and/or receive
approval for additional pending patents.

      We need to preserve and acquire enforceable patents covering the use of
Ampligen(R) and Alferon N Injection(R) for a particular disease in order to
obtain exclusive rights for the commercial sale of such drug for such disease.
Our success depends, in large part, on our ability to preserve and obtain patent
protection for our products and to obtain and preserve our trade secrets and
expertise. Certain of our know-how and technology is not patentable,
particularly the procedures for the manufacture of our drug product which are
carried out according to standard operating procedure manuals. We have been
issued certain patents including those on the use of Ampligen(R) and Ampligen(R)
in combination with certain other drugs for the treatment of HIV. We also have
been issued patents on the use of Ampligen(R) in combination with certain other
drugs for the treatment of chronic Hepatitis B virus, chronic Hepatitis C virus,
and a patent which affords protection on the use of Ampligen(R) in patients with
Chronic Fatigue Syndrome. We have not yet been issued any patents in the United
States for the use of Ampligen(R) as a sole treatment for any of the cancers,
which we have sought to target. With regard to ALFERON N Injection(R), we have
acquired from ISI its patents for natural alpha interferon produced from human
peripheral blood leukocytes and its production process. We cannot assure that
our competitors will not seek and obtain patents regarding the use of similar
products in combination with various other agents, for a particular target
indication prior to our doing such. If we cannot protect our patents covering
the use of our products for a particular disease, or obtain additional patents,
we may not be able to successfully market our products.

The patent position of biotechnology and pharmaceutical firms is highly
uncertain and involves complex legal and factual questions.

      To date, no consistent policy has emerged regarding the breadth of
protection afforded by pharmaceutical and biotechnology patents. There can be no
assurance that new patent applications relating to our products or technology
will result in patents being issued or that, if issued, such patents will afford
meaningful protection against competitors with similar technology. It is
generally anticipated that there may be significant litigation in the industry
regarding patent and intellectual property rights. Such litigation could require
substantial resources from us and we may not have the financial resources
necessary to enforce the patent rights that we hold. No assurance can be made
that our patents will provide competitive advantages for our products or will
not be successfully challenged by competitors. No assurance can be given that
patents do not exist or could not be filed which would have a materially adverse
effect on our ability to develop or market our products or to obtain or maintain
any competitive position that we may achieve with respect to our products. Our
patents also may not prevent others from developing competitive products using
related technology.


                                       6


There can be no assurance that we will be able to obtain necessary licenses if
we cannot enforce patent rights we may hold. In addition, the failure of third
parties from whom we currently license certain proprietary information or from
whom we may be required to obtain such licenses in the future, to adequately
enforce their rights to such proprietary information, could adversely affect the
value of such licenses to us.

      If we cannot enforce the patent rights we currently hold we may be
required to obtain licenses from others to develop, manufacture or market our
products. There can be no assurance that we would be able to obtain any such
licenses on commercially reasonable terms, if at all. We currently license
certain proprietary information from third parties, some of which may have been
developed with government grants under circumstances where the government
maintained certain rights with respect to the proprietary information developed.
No assurances can be given that such third parties will adequately enforce any
rights they may have or that the rights, if any, retained by the government will
not adversely affect the value of our license.

There is no guarantee that our trade secrets will not be disclosed or known by
our competitors.

      To protect our rights, we require certain employees and consultants to
enter into confidentiality agreements with us. There can be no assurance that
these agreements will not be breached, that we would have adequate and
enforceable remedies for any breach, or that any trade secrets of ours will not
otherwise become known or be independently developed by competitors.

If our distributors do not market our products successfully, we may not generate
significant revenues or become profitable.

      We have limited marketing and sales capability. We are dependent upon
existing and, possibly future, marketing agreements and third party distribution
agreements for our products in order to generate significant revenues and become
profitable. As a result, any revenues received by us will be dependent on the
efforts of third parties, and there is no assurance that these efforts will be
successful. Our agreement with Accredo offers the potential to provide some
marketing and distribution capacity in the United States while agreements with
Bioclones (Proprietary), Ltd., Biovail Corporation and Laboratorios Del Dr.
Esteve S.A. may provide a sales force in South America, Africa, United Kingdom,
Australia and New Zealand, Canada, Spain and Portugal.

      We cannot assure that our domestic or foreign marketing partners will be
able to successfully distribute our products, or that we will be able to
establish future marketing or third party distribution agreements on terms
acceptable to us, or that the cost of establishing these arrangements will not
exceed any product revenues. The failure to continue these arrangements or to
achieve other such arrangements on satisfactory terms could have a materially
adverse effect on us.


                                       7


There are no long-term agreements with suppliers of required materials. If we
are unable to obtain the required raw materials, we may be required to scale
back our operations or stop manufacturing ALFERON N Injection.

      A number of essential materials are used in the production of ALFERON N
Injection(R), including human white blood cells. We do not have long-term
agreements for the supply of any of such materials. There can be no assurance we
can enter into long-term supply agreements covering essential materials on
commercially reasonable terms, if at all. If we are unable to obtain the
required raw materials, we may be required to scale back our operations or stop
manufacturing ALFERON N Injection(R). The costs and availability of products and
materials we need for the commercial production of ALFERON N Injection(R) and
other products which we may commercially produce are subject to fluctuation
depending on a variety of factors beyond our control, including competitive
factors, changes in technology, and FDA and other governmental regulations and
there can be no assurance that we will be able to obtain such products and
materials on terms acceptable to us or at all.

There is no assurance that successful manufacture of a drug on a limited scale
basis for investigational use will lead to a successful transition to
commercial, large-scale production.

      Small changes in methods of manufacturing may affect the chemical
structure of Ampligen(R) and other RNA drugs, as well as their safety and
efficacy. Changes in methods of manufacture, including commercial scale-up may
affect the chemical structure of Ampligen(R) and can, among other things,
require new clinical studies and affect orphan drug status, particularly, market
exclusivity rights, if any, under the Orphan Drug Act. The transition from
limited production of pre-clinical and clinical research quantities to
production of commercial quantities of our products will involve distinct
management and technical challenges and will require additional management and
technical personnel and capital to the extent such manufacturing is not handled
by third parties. There can be no assurance that our manufacturing will be
successful or that any given product will be determined to be safe and
effective, capable of being manufactured economically in commercial quantities
or successfully marketed.

We have limited manufacturing experience and capacity.

      Ampligen(R) is currently produced only in limited quantities for use in
our clinical trials and we are dependent upon certain third party suppliers for
key components of our products and for substantially all of the production
process. The failure to continue these arrangements or to achieve other such
arrangements on satisfactory terms could have a material adverse affect on us.
Also, to be successful, our products must be manufactured in commercial
quantities in compliance with regulatory requirements and at acceptable costs.
To the extent we are involved in the production process, our current facilities
are not adequate for the production of our proposed products for large-scale
commercialization, and we currently do not have adequate personnel to conduct
commercial-scale manufacturing. We intend to utilize third-party facilities if
and when the need arises or, if we are unable to do so, to build or acquire
commercial-scale manufacturing facilities. We will need to comply with
regulatory requirements for such facilities, including those of the FDA and HPB
pertaining to current Good Manufacturing Practices


                                       8


("cGMP") regulations. There can be no assurance that such facilities can be
used, built, or acquired on commercially acceptable terms, or that such
facilities, if used, built, or acquired, will be adequate for our long-term
needs.

      The purified drug concentrate utilized in the formulation of ALFERON N
Injection(R) is manufactured in ISI's facility and ALFERON N Injection(R) is
formulated and packaged at a production facility operated by Abbott Laboratories
located in Kansas. In March 2004 we acquired ISI's New Brunswick, NJ facility.
We still will be dependent upon Abbott Laboratories and/or another third party
for product formulation and packaging.

We may not be profitable unless we can produce Ampligen(R) or other products in
commercial quantities at costs acceptable to us.

      We have never produced Ampligen(R) or any other products in large
commercial quantities. Ampligen(R) is currently produced for use in clinical
trials. We must manufacture our products in compliance with regulatory
requirements in large commercial quantities and at acceptable costs in order for
us to be profitable. We intend to utilize third-party manufacturers and/or
facilities if and when the need arises or, if we are unable to do so, to build
or acquire commercial-scale manufacturing facilities. If we cannot manufacture
commercial quantities of Ampligen(R) or enter into third party agreements for
its manufacture at costs acceptable to us, our operations will be significantly
affected. Also, each production lots of Alferon N Injection(R) is subject to FDA
review and approval prior to releasing the lots to be sold. This review and
approval process could take considerable time, which would delay our having
product in inventory to sell. Alferon N Injection(R) has a shelf life of 18
months after having been bottled.

Rapid technological change may render our products obsolete or non-competitive.

      The pharmaceutical and biotechnology industries are subject to rapid and
substantial technological change. Technological competition from pharmaceutical
and biotechnology companies, universities, governmental entities and others
diversifying into the field is intense and is expected to increase. Most of
these entities have significantly greater research and development capabilities
than us, as well as substantial marketing, financial and managerial resources,
and represent significant competition for us. There can be no assurance that
developments by others will not render our products or technologies obsolete or
noncompetitive or that we will be able to keep pace with technological
developments.

Our products may be subject to substantial competition.

      Ampligen(R). Competitors may be developing technologies that are, or in
the future may be, the basis for competitive products. Some of these potential
products may have an entirely different approach or means of accomplishing
similar therapeutic effects to products being developed by us. These competing
products may be more effective and less costly than our products. In addition,
conventional drug therapy, surgery and other more familiar treatments may offer
competition to our products. Furthermore, many of our competitors have
significantly greater experience than us in pre-clinical testing and human
clinical trials of pharmaceutical


                                       9


products and in obtaining FDA, HPB and other regulatory approvals of products.
Accordingly, our competitors may succeed in obtaining FDA, HPB or other
regulatory product approvals more rapidly than us. There are no drugs approved
for commercial sale with respect to treating ME/CFS in the United States. The
dominant competitors with drugs to treat HIV diseases include Gilead
Pharmaceutical, Pfizer, Bristol-Myers, Abbott Labs, Glaxo Smithkline, Merck and
Schering-Plough Corp. These potential competitors are among the largest
pharmaceutical companies in the world, are well known to the public and the
medical community, and have substantially greater financial resources, product
development, and manufacturing and marketing capabilities than we have. Although
we believe our principal advantage is the unique mechanism of action of
Ampligen(R) on the immune system, we cannot assure that we will be able to
compete.

      ALFERON N Injection(R). Many potential competitors are among the largest
pharmaceutical companies in the world, are well known to the public and the
medical community, and have substantially greater financial resources, product
development, and manufacturing and marketing capabilities than we have. ALFERON
N Injection(R) currently competes with Schering's injectable recombinant alpha
interferon product (INTRON(R) A) for the treatment of genital warts. 3M
Pharmaceuticals also received FDA approval for its immune-response modifier,
Aldara(R), a self-administered topical cream, for the treatment of external
genital and perianal warts. ALFERON N Injection(R) also competes with surgical,
chemical, and other methods of treating genital warts. We cannot assess the
impact products developed by our competitors, or advances in other methods of
the treatment of genital warts, will have on the commercial viability of ALFERON
N Injection(R). If and when we obtain additional approvals of uses of this
product, we expect to compete primarily on the basis of product performance. Our
potential competitors have developed or may develop products (containing either
alpha or beta interferon or other therapeutic compounds) or other treatment
modalities for those uses. In the United States, three recombinant forms of beta
interferon have been approved for the treatment of relapsing-remitting multiple
sclerosis. There can be no assurance that, if we are able to obtain regulatory
approval of ALFERON N Injection(R) for the treatment of new indications, we will
be able to achieve any significant penetration into those markets. In addition,
because certain competitive products are not dependent on a source of human
blood cells, such products may be able to be produced in greater volume and at a
lower cost than ALFERON N Injection(R). Currently, our wholesale price on a per
unit basis of ALFERON N Injection(R) is higher than that of the competitive
recombinant alpha and beta interferon products.

      General. Other companies may succeed in developing products earlier than
we do, obtaining approvals for such products from the FDA more rapidly than we
do, or developing products that are more effective than those we may develop.
While we will attempt to expand our technological capabilities in order to
remain competitive, there can be no assurance that research and development by
others or other medical advances will not render our technology or products
obsolete or non-competitive or result in treatments or cures superior to any
therapy we develop.

Possible side effects from the use of Ampligen(R) or ALFERON N Injection(R)
could adversely affect potential revenues and physician/patient acceptability of
our product.


                                       10


      Ampligen(R). We believe that Ampligen(R) has been generally well tolerated
with a low incidence of clinical toxicity, particularly given the severely
debilitating or life threatening diseases that have been treated. A mild
flushing reaction has been observed in approximately 15% of patients treated in
our various studies. This reaction is occasionally accompanied by a rapid heart
beat, a tightness of the chest, urticaria (swelling of the skin), anxiety,
shortness of breath, subjective reports of "feeling hot," sweating and nausea.
The reaction is usually infusion-rate related and can generally be controlled by
slowing the infusion rate. Other adverse side effects include liver enzyme level
elevations, diarrhea, itching, asthma, low blood pressure, photophobia, rash,
transient visual disturbances, slow or irregular heart rate, decreases in
platelets and white blood cell counts, anemia, dizziness, confusion, elevation
of kidney function tests, occasional temporary hair loss and various flu-like
symptoms, including fever, chills, fatigue, muscular aches, joint pains,
headaches, nausea and vomiting. These flu-like side effects typically subside
within several months. One or more of the potential side effects might deter
usage of Ampligen(R) in certain clinical situations and therefore, could
adversely affect potential revenues and physician/patient acceptability of our
product.

      ALFERON N Injection(R). At present, ALFERON N Injection(R) is only
approved for the intralesional (within the lesion) treatment of refractory or
recurring external genital warts in adults. In clinical trials conducted for the
treatment of genital warts with ALFERON N Injection(R), patients did not
experience serious side effects; however, there can be no assurance that
unexpected or unacceptable side effects will not be found in the future for this
use or other potential uses of ALFERON N Injection(R) which could threaten or
limit such product's usefulness.

We may be subject to product liability claims from the use of Ampligen(R) or
other of our products which could negatively affect our future operations.

      We face an inherent business risk of exposure to product liability claims
in the event that the use of Ampligen(R) or other of our products results in
adverse effects. This liability might result from claims made directly by
patients, hospitals, clinics or other consumers, or by pharmaceutical companies
or others manufacturing these products on our behalf. Our future operations may
be negatively affected from the litigation costs, settlement expenses and lost
product sales inherent to these claims. While we will continue to attempt to
take appropriate precautions, we cannot assure that we will avoid significant
product liability exposure. Although we currently maintain product liability
insurance coverage, there can be no assurance that this insurance will provide
adequate coverage against Ampligen and/or Alferon N Injection product liability
claims. A successful product liability claim against us in excess of Ampligen's
$1,000,000 in insurance coverage; $3,000,000 in aggregate, or in excess of
Alferon's $5,000,000 in insurance coverage; $5,000,000 in aggregate; or for
which coverage is not provided could have a negative effect on our business and
financial condition.

The loss of Dr. William A. Carter's services could hurt our chances for success.


                                       11


      Our success is dependent on the continued efforts of Dr. William A. Carter
because of his position as a pioneer in the field of nucleic acid drugs, his
being the co-inventor of Ampligen(R), and his knowledge of our overall
activities, including patents and clinical trials. The loss of Dr. Carter's
services could have a material adverse effect on our operations and chances for
success. We have secured key man life insurance in the amount of $2 million on
the life of Dr. Carter and we have an employment agreement with Dr. Carter that,
as amended, runs until May 8, 2008. However, Dr. Carter has the right to
terminate his employment upon not less than 30 days prior written notice. The
loss of Dr. Carter or other personnel, or the failure to recruit additional
personnel as needed could have a materially adverse effect on our ability to
achieve our objectives.

Uncertainty of health care reimbursement for our products.

      Our ability to successfully commercialize our products will depend, in
part, on the extent to which reimbursement for the cost of such products and
related treatment will be available from government health administration
authorities, private health coverage insurers and other organizations.
Significant uncertainty exists as to the reimbursement status of newly approved
health care products, and from time to time legislation is proposed, which, if
adopted, could further restrict the prices charged by and/or amounts
reimbursable to manufacturers of pharmaceutical products. We cannot predict
what, if any, legislation will ultimately be adopted or the impact of such
legislation on us. There can be no assurance that third party insurance
companies will allow us to charge and receive payments for products sufficient
to realize an appropriate return on our investment in product development.

There are risks of liabilities associated with handling and disposing of
hazardous materials.

      Our business involves the controlled use of hazardous materials,
carcinogenic chemicals and various radioactive compounds. Although we believe
that our safety procedures for handling and disposing of such materials comply
in all material respects with the standards prescribed by applicable
regulations, the risk of accidental contamination or injury from these materials
cannot be completely eliminated. In the event of such an accident or the failure
to comply with applicable regulations, we could be held liable for any damages
that result, and any such liability could be significant. We do not maintain
insurance coverage against such liabilities.

The market price of our stock may be adversely affected by market volatility.

      The market price of our common stock has been and is likely to be
volatile. In addition to general economic, political and market conditions, the
price and trading volume of our stock could fluctuate widely in response to many
factors, including:

o     announcements of the results of clinical trials by us or our competitors;
o     adverse reactions to products;
o     governmental approvals, delays in expected governmental approvals or
      withdrawals of any prior governmental approvals or public or regulatory
      agency concerns regarding the safety or effectiveness of our products;
o     changes in U.S. or foreign regulatory policy during the period of product
      development;


                                       12


o     developments in patent or other proprietary rights, including any third
      party challenges of our intellectual property rights;
o     announcements of technological innovations by us or our competitors;
o     announcements of new products or new contracts by us or our competitors;
o     actual or anticipated variations in our operating results due to the level
      of development expenses and other factors;
o     changes in financial estimates by securities analysts and whether our
      earnings meet or exceed the estimates;
o     conditions and trends in the pharmaceutical and other industries;
o     new accounting standards; and
o     the occurrence of any of the risks described in these "Risk Factors."

      Our common stock is listed for quotation on the American Stock Exchange.
For the 12-month period ended August 15, 2004, the price of our common stock has
ranged from $1.82 to $5.40 per shares. We expect the price of our common stock
to remain volatile. The average daily trading volume of our common stock varies
significantly. Our relatively low average volume and low average number of
transactions per day may affect the ability of our stockholders to sell their
shares in the public market at prevailing prices and a more active market may
never develop.

      In the past, following periods of volatility in the market price of the
securities of companies in our industry, securities class action litigation has
often been instituted against companies in our industry. If we face securities
litigation in the future, even if without merit or unsuccessful, it would result
in substantial costs and a diversion of management attention and resources,
which would negatively impact our business.

Our stock price may be adversely affected if a significant amount of shares,
primarily those registered herein and in a prior registration statement, are
sold in the public market.

      As of September 13, 2004, approximately 5,023,323 shares of our common
stock, constituted "restricted securities" as defined in Rule 144 under the
Securities Act of 1933. 4,941,120 of these shares are registered herein or in a
prior registration statement pursuant to agreements between us and the holders
of these shares. In addition, we have registered 10,843,964 shares issuable (i)
upon conversion of approximately 135% of Debentures that we issued in 2003 and
2004; (ii) as payment of 135% of the interest on all of the Debentures; (iii)
upon exercise of 135% of an aggregate of 3,390,514 warrants that we issued in
January, May and July 2004; and (iv) upon exercise of certain other warrants and
stock options. Registration of the shares permits the sale of the shares in the
open market or in privately negotiated transactions without compliance with the
requirements of Rule 144. To the extent the exercise price of the warrants is
less than the market price of the common stock, the holders of the warrants are
likely to exercise them and sell the underlying shares of common stock and to
the extent that the conversion price and exercise price of these securities are
adjusted pursuant to anti-dilution protection, the securities could be
exercisable or convertible for even more shares of common stock. We also may
issue shares to be used to meet our capital requirements or use shares to
compensate employees, consultants and/or directors. We are unable to estimate
the amount, timing or nature of future sales of outstanding common stock. Sales
of substantial amounts of our common stock in the public market could cause


                                       13


the market price for our common stock to decrease. Furthermore, a decline in the
price of our common stock would likely impede our ability to raise capital
through the issuance of additional shares of common stock or other equity
securities.

Provisions of our Certificate of Incorporation and Delaware law could defer a
change of our management which could discourage or delay offers to acquire us.

      Provisions of our Certificate of Incorporation and Delaware law may make
it more difficult for someone to acquire control of us or for our stockholders
to remove existing management, and might discourage a third party from offering
to acquire us, even if a change in control or in management would be beneficial
to our stockholders. For example, our Certificate of Incorporation allows us to
issue shares of preferred stock without any vote or further action by our
stockholders. Our Board of Directors has the authority to fix and determine the
relative rights and preferences of preferred stock. Our Board of Directors also
has the authority to issue preferred stock without further stockholder approval.
As a result, our Board of Directors could authorize the issuance of a series of
preferred stock that would grant to holders the preferred right to our assets
upon liquidation, the right to receive dividend payments before dividends are
distributed to the holders of common stock and the right to the redemption of
the shares, together with a premium, prior to the redemption of our common
stock. In this regard, in November, 2002 we adopted a stockholder rights plan
and, under the Plan, our Board of Directors declared a dividend distribution of
one Right for each outstanding share of Common Stock to stockholders of record
at the close of business on November 29, 2002. Each Right initially entitles
holders to buy one unit of preferred stock for $30.00. The Rights generally are
not transferable apart from the common stock and will not be exercisable unless
and until a person or group acquires or commences a tender or exchange offer to
acquire, beneficial ownership of 15% or more of our common stock. However, for
Dr. Carter, our chief executive officer, who already beneficially owns 10.6% of
our common stock, the Plan's threshold will be 20%, instead of 15%. The Rights
will expire on November 19, 2012, and may be redeemed prior thereto at $.01 per
Right under certain circumstances.

      Because the risk factors referred to above could cause actual results or
outcomes to differ materially from those expressed in any forward-looking
statements made by us, you should not place undue reliance on any such
forward-looking statements. Further, any forward-looking statement speaks only
as of the date on which it is made and we undertake no obligation to update any
forward-looking statement or statements to reflect events or circumstances after
the date on which such statement is made or reflect the occurrence of
unanticipated events. New factors emerge from time to time, and it is not
possible for us to predict which will arise. In addition, we cannot assess the
impact of each factor on our business or the extent to which any factor, or
combination of factors, may cause actual results to differ materially from those
contained in any forward-looking statements. Our research in clinical efforts
may continue for the next several years and we may continue to incur losses due
to clinical costs incurred in the development of Ampligen(R) for commercial
application. Possible losses may fluctuate from quarter to quarter as a result
of differences in the timing of significant expenses incurred and receipt of
licensing fees and/or cost recovery treatment revenues in Europe, Canada and in
the United States.


                                       14


                              SELLING STOCKHOLDERS

      The following table provides information regarding the selling
stockholders and the number of shares of common stock they are offering, which
includes shares issuable upon exercise of warrants held by the selling
stockholders. Under the rules of the SEC, beneficial ownership includes shares
over which the indicated beneficial owner exercises voting or investment power.
Shares of common stock subject to warrants and options that are currently
exercisable or will become exercisable within 60 days are deemed outstanding for
computing the percentage ownership of the person holding the options but are not
deemed outstanding for computing the percentage ownership of any other person.
Notwithstanding the foregoing, certain of the selling stockholders elected, at
the time of the initial issuance of the warrants, to include provisions in the
warrant, which provide that the warrants may not be exercised if such action
would result in the holder, together with its affiliates, beneficially owning
more than 4.999% of our common stock for purposes of Section 13(d) of the
Exchange Act, unless the holder of the warrant waives the restriction in which
case the restriction is lifted on the 61st day after the waiver. In addition,
certain of the selling stockholders elected, at the time of the initial issuance
of the warrants, to include provisions in the warrant, which provide that the
warrants may not be exercised if such action would result in the holder,
together with its affiliates, beneficially owning more than 9.999% of our common
stock for purposes of Section 13(d) of the Exchange Act, which restriction
cannot be waived by the holder. These restrictions do not apply to mergers or
other business combinations or reclassifications.

      Unless otherwise indicated in the footnotes below, we believe that the
persons and entities named in the table have sole voting and investment power
with respect to all shares beneficially owned. The information regarding shares
beneficially owned after the offering assumes the sale of all shares offered by
each of the selling stockholders. The percentage ownership data is based on
49,110,571 shares of our common stock issued and outstanding as of September 13,
2004, including 3,617,306 shares of our common stock covered by this prospectus.

      The shares of common stock covered by this prospectus may be sold by the
selling stockholders, by those persons or entities to whom they transfer,
donate, devise, pledge or distribute their shares or by other successors in
interest. We are registering the shares of our common stock for resale by the
selling stockholders defined below. The shares are being registered to permit
public secondary trading of the shares, and the selling stockholders may offer
the shares for resale from time to time. See "How The Shares May Be Distributed"
below

      On August 5, 2004, pursuant to the Securities Purchase Agreement dated
July 30, 2004, we issued and sold 3,617,306 shares of our common stock and
warrants exercisable for up to 1,085,193 additional shares of our common stock
at a combined unit price of $2.08 per unit in a private placement transaction
(the "Private Placement") for aggregate gross cash proceeds to us of
approximately $7.5 million. The warrant issued to each selling stockholder in
the Private Placement is exercisable for up to 30% of the number of shares of
our common stock purchased by such selling stockholder at an exercise price
equal to $2.86 per share. In addition, we issued a warrant to Jefferies &
Company, Inc. exercisable for up to 150,480 shares of our common stock.


                                       15


Each warrant has a term of five years, is fully exercisable from the date of
issuance. The selling stockholders acquired the common stock and warrants to
purchase common stock to which this prospectus relates directly from us in
transactions exempt from the registration requirements of the federal and state
securities laws. All of the securities were issued and sold solely to accredited
investors, as defined in Rule 501 of Regulation D pursuant to the Securities
Act.

      In connection with the Private Placement, we agreed to file the
registration statement of which this prospectus forms a part with the SEC
covering the resale of the offered shares. We also agreed to prepare and file
all amendments and supplements necessary to keep the registration statement
effective until the earlier of two years after the date that this registration
statement is declared effective by the SEC, subject to extension as set forth in
the registration rights agreement, the date on which the selling stockholders
may resell all the shares covered by the registration statement without volume
restrictions pursuant to Rule 144 under the Securities Act or any successor rule
of similar effect and the date on which the selling stockholders have sold all
the shares covered by the registration statement.

      The following table has been prepared based solely upon information
furnished to us as of the date of this prospectus by the selling stockholders
listed below. The selling stockholders identified below may have sold,
transferred or otherwise disposed of, in transactions exempt from the
registration requirements of the Securities Act, all or a portion of their
shares since the date on which the information in the following table is
presented.

      None of the selling stockholder has had any position, office or other
material relationship with us or any of our affiliates within the past three
years, other than as a stockholder.



                                                 Common Stock                                Common Stock
                                                 Owned Prior            No. of  Shares        Owned After
Selling Stockholder                              To Offering            Being Offered        The Offering
-------------------                              -----------            -------------        ------------
-----------------------------------------------------------------------------------------------------------
                                                                                         
Portside Growth & Opportunity Fund*(1)            4,474,524               1,250,000               --
-----------------------------------------------------------------------------------------------------------
UBS O'Connor LLC(2)                                 130,000                 130,000               --
-----------------------------------------------------------------------------------------------------------
Kingsbridge Capital Ltd.(3)                         125,000                 125,000               --
-----------------------------------------------------------------------------------------------------------
Fennmore Holdings(4)                                156,250                 156,250               --
-----------------------------------------------------------------------------------------------------------
Smithfield Fiduciary, LLC*(5)                       312,499                 312,499               --
-----------------------------------------------------------------------------------------------------------
Spectra Investments, LLC*(6)                        156,250                 156,250               --
-----------------------------------------------------------------------------------------------------------
Gemini Master Fund, Ltd. (7)                         31,249                  31,249               --
-----------------------------------------------------------------------------------------------------------
Provident Premier Master Fund, Ltd. (8)             156,250                 156,250               --
-----------------------------------------------------------------------------------------------------------
Asset Managers International(9)                   1,249,999               1,249,999               --
-----------------------------------------------------------------------------------------------------------
JMG Capital Partners, LP(10)                        312,501                 312,501               --
-----------------------------------------------------------------------------------------------------------
JMG Triton Offshore Fund, Ltd. (11)                 312,501                 312,501               --
-----------------------------------------------------------------------------------------------------------
Winton Capital Holdings, Ltd. (12)                  260,000                 260,000               --
-----------------------------------------------------------------------------------------------------------
Iroquois Capital LP(13)                             249,999                 249,999               --
-----------------------------------------------------------------------------------------------------------
Jefferies & Company, Inc. (14)                      150,480                 150,480               --
-----------------------------------------------------------------------------------------------------------


*     This selling stockholder has identified itself as an affiliate of a
      registered broker-dealer. The selling stockholder has informed us that it
      acquired the common stock in the ordinary


                                       16


      course of its business for its own account for investment purposes only
      and not with a view to, or for, distributing the securities and, at the
      time of purchase, it did not have any agreements, plans or understandings,
      directly or indirectly, with any person or entity to distribute the
      securities.

(1)   Shares offered represent (a) 961,538 shares and an additional 288,462
      shares issuable upon exercise of warrants issued in the Private Placement.
      The balance of the shares beneficially owned by the selling stockholder
      have been registered in prior registration statements and are eligible for
      resale pursuant to a separate prospectus. These shares represent (a) up to
      1,321,690 shares of common stock issuable upon conversion of Debentures
      issued in January and July 2004, (b) up to 1,695,257 shares of common
      stock issuable upon exercise of additional outstanding warrants, and (c)
      207,577 shares of common stock. Ramius Capital Group, LLC ("Ramius
      Capital") is the investment adviser of Portside Growth & Opportunity Fund
      ("Portside") and consequently has voting control and investment discretion
      over securities held by Portside. Ramius Capital disclaims beneficial
      ownership of the shares held by Portside. Peter A. Cohen, Morgan B. Stark,
      Thomas W. Strauss and Jeffrey M. Solomon are the sole managing members of
      C4S& Co., LLC, the sole managing member of Ramius Capital. As a result,
      Messrs. Cohen, Stark, Strauss and Solomon may be considered beneficial
      owners of any shares deemed to be beneficially owned by Ramius Capital.
      Messrs. Cohen, Stark, Strauss and Solomon disclaim beneficial ownership of
      these shares.

(2)   Shares offered and owned includes 30,000 shares issuable upon exercise of
      warrants issued in the Private Placement. The shares are beneficially
      owned by O'Connor PIPES Corporate Strategies Master Ltd. UBS O'Connor LLC
      is the investment manager for O'Connor PIPES Corporate Strategies Master
      Ltd. UBS O'Connor LLC is a wholly owned subsidiary of UBS AG, which is
      traded on the NYSE.

(3)   Shares offered and owned includes 28,846 shares issuable upon exercise of
      warrants issued in the Private Placement. The selling stockholder has
      identified Adam Gurney, as a natural person with voting and investment
      control over shares of our common stock beneficially owned by the selling
      stockholder.

(4)   Shares offered and owned includes 36,058 shares issuable upon exercise of
      warrants issued in the Private Placement. The selling stockholder has
      identified Mark Nordlicht, as a natural person with voting and investment
      control over shares of our common stock beneficially owned by the selling
      stockholder. Mr. Nordlicht disclaims beneficial ownership of the
      securities held by Fennmore.

(5)   Shares offered and owned includes 72,115 shares issuable upon exercise of
      warrants issued in the Private Placement. Highbridge Capital Management,
      LLC is the trading manager of Smithfield Fiduciary LLC and consequently
      has voting control and investment discretion over securities held by
      Smithfield. Glenn Dubin and Henry Swieca control Highbridge. Each of
      Highbridge, Glenn Dubin and Henry Swieca disclaims beneficial ownership of
      the securities held by Smithfield.


                                       17


(6)   Shares offered and owned includes 36,058 shares issuable upon exercise of
      warrants issued in the Private Placement. The selling stockholder has
      identified Greg Porges, as a natural person with voting and investment
      control over shares of our common stock beneficially owned by the selling
      stockholder. Mr. Porges disclaims beneficial ownership of the securities
      held by Spectra.

(7)   Shares offered and owned includes 7,211 shares issuable upon exercise of
      warrants issued in the Private Placement. Shares listed as owned and
      offered excludes shares beneficially owned by Provident Premier Master
      Fund, Ltd. The Investment Manager of Gemini Master Fund, Ltd. is Gemini
      Investment Strategies, LLC. The Managing Members of Gemini Investment
      Strategies, LLC are Messrs. Steven W. Winters and Mr. Richard S. Yakomin.
      As such, Messrs. Winters and Yakomin may be deemed beneficial owners of
      the shares. Messrs. Winters and Yakomin, however, disclaim beneficial
      ownership of such shares.

(8)   Shares offered and owned includes 36,058 shares issuable upon exercise of
      warrants issued in the Private Placement. Shares listed as owned and
      offered excludes shares beneficially owned by Gemini Master Fund, Ltd. The
      Investment Advisor to Provident Premier Master Fund, Ltd. is Gemini
      Investment Strategies, LLC. The Managing Members of Gemini Investment
      Strategies, LLC are Messrs. Steven W. Winters and Mr. Richard S. Yakomin.
      As such, Messrs. Winters and Yakomin may be deemed beneficial owners of
      the shares. Messrs. Winters and Yakomin, however, disclaim beneficial
      ownership of such shares.

(9)   Shares offered and owned includes 288,461 shares issuable upon exercise of
      warrants issued in the Private Placement. The selling stockholder has
      identified Adam Benowitz, as a natural person with voting and investment
      control over shares of our common stock beneficially owned by the selling
      stockholder. Mr. Benowitz disclaims beneficial ownership of the securities
      held by Asset Managers International.

(10)  Shares offered and owned includes 72,116 shares issuable upon exercise of
      warrants issued in the Private Placement. Shares listed as owned and
      offered excludes shares beneficially owned by JMG Triton Offshore Fund,
      Ltd. JMG Capital Partners, L.P. ("JMG Partners") is a California limited
      partnership. Its general partner is JMG Capital Management, LLC (the
      "Manager"), a Delaware limited liability company and an investment adviser
      registered with the Securities and Exchange Commission. The Manager has
      voting and dispositive power over JMG Partners' investments, including the
      Registrable Securities. The equity interests of the Manager are owned by
      JMG Capital Management, Inc., ("JMG Capital") a Delaware corporation, and
      Asset Alliance Holding Corp., a Delaware corporation. Jonathan M. Glaser
      is the Executive Officer and Director of JMG Capital and has sole
      investment discretion over JMG Partners' portfolio holdings.


                                       18


(11)  Shares offered and owned includes 72,116 shares issuable upon exercise of
      warrants issued in the Private Placement. Shares listed as owned and
      offered excludes shares beneficially owned by JMG Capital Partners, L.P.
      JMG Triton Offshore Fund, Ltd. (The "Fund") is an international business
      company under the laws of the British Virgin Islands. The Fund's
      investment manager is Pacific Assets Management LLC, a Delaware limited
      liability company (the "Manager"). The Manager is an investment adviser
      registered with the Securities and Exchange Commission and has voting and
      dispositive power over the Fund's investments, including the Registrable
      Securities. The equity interests of the Manager are owned by Pacific
      Capital Management, Inc., a Delaware company ("the Pacific") and Asset
      Alliance Holding Corp., a Delaware company. The equity interests of
      Pacific are owned by Messrs. Roger Richter, Jonathan M. Glaser and Daniel
      A. David and Messrs. Glaser and Richter have sole investment discretion
      over the fund's portfolio holdings.

(12)  Shares offered and owned includes 60,000 shares issuable upon exercise of
      warrants issued in the Private Placement. The selling stockholder has
      identified Marc Belzberg, as a natural person with voting and investment
      control over shares of our common stock beneficially owned by the selling
      stockholder.

(13)  Shares offered and owned includes 57,692 shares issuable upon exercise of
      warrants issued in the Private Placement. The selling stockholder has
      identified Joshua Silverman, as a natural person with voting and
      investment control over shares of our common stock beneficially owned by
      the selling stockholder. Mr. Silverman disclaims beneficial ownership of
      the shares held by Iroquois Capital LP.

(14)  Represents 150,480 shares issuable upon exercise of immediately
      exercisable warrants. Jefferies acted as the sole placement agent in the
      financing and is a registered broker-dealer. Based upon representations
      made to us by Jefferies, the warrant to purchase common stock were
      acquired in the ordinary course of its business for its own account for
      investment purposes only and not with a view to, or for, distributing the
      warrant or the shares of common stock issuable upon exercise thereof.
      Jefferies does not have any agreements, plans or understandings, directly
      or indirectly, with any person or entity to distribute the warrant to
      purchase common stock or the shares of common stock issuable upon exercise
      of the warrant.

      THE SELLING STOCKHOLDERS HAVE NOT BEEN EMPLOYED BY, HELD OFFICE IN, OR HAD
ANY OTHER MATERIAL RELATIONSHIP WITH US OR ANY OF OUR AFFILIATES WITHIN THE PAST
THREE YEARS EXCEPT AS DESCRIBED ABOVE IN THE FOOTNOTES ABOVE.


                                       19


                       HOW THE SHARES MAY BE DISTRIBUTED

      The Selling Stockholders and any of their pledgees, donees, assignees and
successors-in-interest may, from time to time, sell any or all of their shares
of Common Stock on any stock exchange, market or trading facility on which the
shares are traded or in private transactions. These sales may be at fixed or
negotiated prices. The Selling Stockholders may use any one or more of the
following methods when selling shares:

o     ordinary brokerage transactions and transactions in which the
      broker-dealer solicits purchasers;

o     block trades in which the broker-dealer will attempt to sell the shares as
      agent but may position and resell a portion of the block as principal to
      facilitate the transaction;

o     purchases by a broker-dealer as principal and resale by the broker-dealer
      for its account;

o     an exchange distribution in accordance with the rules of the applicable
      exchange;

o     privately negotiated transactions;

o     short sales;

o     broker-dealers may agree with the Selling Stockholders to sell a specified
      number of such shares at a stipulated price per share;

o     a combination of any such methods of sale; and

o     any other method permitted pursuant to applicable law.

      The Selling Stockholders may also sell shares under Rule 144 under the
Securities Act, if available, rather than under this prospectus.

      Broker-dealers engaged by the Selling Stockholders may arrange for other
brokers-dealers to participate in sales. Broker-dealers may receive commissions
or discounts from the Selling Stockholders (or, if any broker-dealer acts as
agent for the purchaser of shares, from the purchaser) in amounts to be
negotiated. The Selling Stockholders do not expect these commissions and
discounts to exceed what is customary in the types of transactions involved.

      The Selling Stockholders may from time to time pledge or grant a security
interest in some or all of the Shares owned by them and, if they default in the
performance of their secured obligations, the pledgees or secured parties may
offer and sell shares of Common Stock from time to time under this prospectus,
or under an amendment to this prospectus under Rule 424(b)(3) or other
applicable provision of the Securities Act of 1933 amending the list of selling
stockholders to include the pledgee, transferee or other successors in interest
as selling stockholders under this prospectus.

      Upon our being notified in writing by a Selling Stockholder that any
material arrangement has been entered into with a broker-dealer for the sale of
Common Stock through a block trade, special offering, exchange distribution or
secondary distribution or a purchase by a


                                       20


broker or dealer, a supplement to this prospectus will be filed, if required,
pursuant to Rule 424(b) under the Securities Act, disclosing (i) the name of
each such Selling Stockholder and of the participating broker-dealer(s), (ii)
the number of shares involved, (iii) the price at which such the shares of
Common Stock were sold, (iv)the commissions paid or discounts or concessions
allowed to such broker-dealer(s), where applicable, (v) that such
broker-dealer(s) did not conduct any investigation to verify the information set
out or incorporated by reference in this prospectus, and (vi) other facts
material to the transaction. In addition, upon our being notified in writing by
a Selling Stockholder that a donee or pledge intends to sell more than 500
shares of Common Stock, a supplement to this prospectus will be filed if then
required in accordance with applicable securities law.

      The Selling Stockholders also may transfer the shares of common stock in
other circumstances, in which case the transferees, pledgees or other successors
in interest will be the selling beneficial owners for purposes of this
prospectus.

      The Selling Stockholders and any broker-dealers or agents that are
involved in selling the shares may be deemed to be "underwriters" within the
meaning of the Securities Act in connection with such sales. In such event, any
commissions received by such broker-dealers or agents and any profit on the
resale of the shares purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act. Each Selling Stockholders has
represented and warranted to us that it does not have any agreement or
understanding, directly or indirectly, with any person to distribute the Common
Stock.

      We have advised the Selling Stockholders that they are required to comply
with Regulation M promulgated under the Securities and Exchange Act during such
time as they may be engaged in a distribution of the shares. The foregoing may
affect the marketability of the common stock.

      We are required to pay all fees and expenses incident to the registration
of the shares. We have agreed to indemnify the Selling Stockholders against
certain losses, claims, damages and liabilities, including liabilities under the
Securities Act.

      Under the securities laws of certain states, the shares may be sold in
those states only through registered or licensed broker-dealers. In addition,
the shares may not be sold unless the shares have been registered or qualified
for sale in the relevant state or unless the shares qualify for an exemption
from registration or qualification.

                                USE OF PROCEEDS

      We will not receive any proceeds from the sale of the shares of common
stock offered by the selling stockholders. Proceeds from the exercising of the
Warrants will be used for conducting clinical trials and related activities,
research and development and general corporate purposes.


                                       21


                       WHERE YOU CAN FIND MORE INFORMATION

      We file annual, quarterly and special reports, proxy statements and other
information with the Securities and Exchange Commission. You may read and copy
any document we file at the Securities and Exchange Commission's public
reference rooms at 450 Fifth Street, N.W., Washington, D.C. 20549. Please call
the Securities and Exchange Commission at 1-800-SEC-0330 for further information
on the public reference rooms. Many of our Securities and Exchange Commission
filings are also available to the public from the Securities and Exchange
Commission's Website at "http://www.sec.gov."

      We have filed with the Securities and Exchange Commission a registration
statement (which contains this prospectus) on Form S-3 under the Securities Act
of 1933. The registration statement relates to the securities offered by the
selling stockholders. This prospectus does not contain all of the information
set forth in the registration statement and the exhibits and schedules to the
registration statement. Please refer to the registration statement and its
exhibits and schedules for further information with respect to us, the common
stock and the Warrants. Statements contained in this prospectus as to the
contents of any contract or other document are not necessarily complete and, in
each instance, we refer you to the copy of that contract or document filed as an
exhibit to the Registration Statement. You may read and obtain a copy of the
registration statement and its exhibits and schedules from the SEC, as described
in the preceding paragraph.

                      INFORMATION INCORPORATED BY REFERENCE

      The Commission allows us to "incorporate by reference" the information
that we file with them, which means that we can disclose important information
to you by referring you to those documents. The information incorporated by
reference is considered to be part of this prospectus, and later information
that we file with the Commission will automatically update and supercede this
information. We incorporate by reference the following documents and any future
filing made with the Commission under Sections 13(a), 14 or 15(d) of the
Securities Exchange Act of 1934 until we and the selling stockholders sell all
the securities included in this prospectus:

(a)   Our amended annual report on Form 10-K for our fiscal year ended December
      31, 2003, SEC File No. 1-13441.

(b)   Our quarterly report on Form 10-Q for the quarterly period ended March 31,
      2004, SEC File No. 1-13441.

(c)   Our proxy statement on schedule 14A for our 2004 annual meeting, SEC File
      No. 1-13441.

(d)   Our current report on Form 8-K filed on July 15, 2004, SEC File No.
      1-13441.

(e)   Our current report on Form 8-K filed on August 2, 2004, SEC File No.
      1-13441.


                                       22


(f)   Our current report on Form 8-K filed on August 6, 2004, SEC File No.
      1-13441.

(g)   Our quarterly report on Form 10-Q for the quarterly period ended June 30,
      2004, SEC File No. 1-13441.

(h)   A description of our common stock contained in our registration statement
      on Form S-1, SEC File No. 33-93314, and any amendment or report filed for
      the purpose of updating this description filed subsequent to the date of
      this prospectus and prior to the termination of this offering.

(i)   Our Form S-1 Registration Statement, SEC File No. 333-117178, declared
      effective by the SEC on August 2, 2004.

(j)   Our current report on Form 8-K filed on September 15, 2004, SEC File No.
      1-13441.

      You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address: Hemispherx Biopharma, Inc., 1617 JFK
Boulevard, Philadelphia, Pennsylvania 19103, telephone number 215-988-0080.

      You should rely only on the information incorporated by reference or
provided in this prospectus or any supplement. We have not authorized anyone
else to provide you with different information. We and the selling stockholders
will not make offers to these shares in any state where the offer is not
permitted. You should not assume that the information in this prospectus or any
supplement is accurate as of any date other that the date on the front of those
documents.

                                  LEGAL MATTERS

      The validity of the common stock offered in this prospectus has been
passed upon for us by Silverman Sclar Shin & Byrne PLLC, 381 Park Avenue South,
Suite 1601, New York, New York 10016.

                                     EXPERTS

      Our financial statements incorporated by reference in this Prospectus
which are included in our Annual Report of Form 10-K/A for the year ended
December 31, 2003 have been audited by BDO Seidman, LLP, independent registered
public accountants, to the extent and for the periods set forth in their report,
and are included in reliance upon such report given upon the authority of said
firm as experts in auditing and accounting.

      The financial statements of Interferon Sciences, Inc. incorporated by
reference in this Prospectus which are included in our registration statement on
Form S-1 (SEC file no. 333-117178) have been audited by Eisner LLP, independent
registered public accountants, to the extent and for the periods set forth in
their report, and are included in reliance upon such report given upon the
authority of said firm as experts in auditing and accounting.


                                       23


--------------------------------------------------------------------------------

No dealer, salesman or any other person is authorized to give any information or
to represent anything not contained in this prospectus. You must not rely on any
unauthorized information or representations. This prospectus is an offer to sell
these securities and it is not a solicitation of an offer to buy these
securities in any state where the offer or sale is not permitted. The
information contained in this Prospectus is current only as of this date.

                                TABLE OF CONTENTS

                                                                            Page

Prospectus Summary ........................................................    2
Risk Factors ..............................................................    3
Selling Stockholders ......................................................   15
How the Shares May
Be Distributed ............................................................   20
Use of Proceeds ...........................................................   21
Where you can find
More information ..........................................................   22
Information Incorporated
By Reference ..............................................................   22
Legal Matters .............................................................   23
Experts ...................................................................   23

================================================================================

--------------------------------------------------------------------------------

                               4,852,979 SHARES OF
                                  COMMON STOCK

                           HEMISPHERX BIOPHARMA, INC.

                                   ----------

                                   PROSPECTUS

                                   ----------

                               September ___, 2004

================================================================================




                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

SEC Filing Fees ............................................   $ 1,606.17
American Stock Exchange Listing Fee* .......................   $22,500.00
Printing and Engraving Expenses* ...........................   $ 4,000.00
Accounting Fees and Expenses* ..............................   $10,000.00
Legal Fees and Expenses* ...................................   $12,500.00
Transfer Agent and Registrar Fees* .........................   $ 1,500.00
Miscellaneous* .............................................   $ 1,893.83

 Total Expenses* ...........................................   $54,000.00

----------
* Estimated.

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

The Registrant's Amended and Restated Certificate of Incorporation provides that
the Registrant shall indemnify to the extent permitted by Delaware law any
person whom it may indemnify thereunder, including directors, officers,
employees and agents of the Registrant. Such indemnification (other than an
order by a court) shall be made by the Registrant only upon a determination that
indemnification is proper in the circumstances because the individual met the
applicable standard of conduct. Advances for such indemnification may be made
pending such determination. In addition, the Registrant's Amended and Restated
Certificate of Incorporation eliminates, to the extent permitted by Delaware
law, personal liability of directors to the Registrant and its stockholders for
monetary damages for breach of fiduciary duty as directors.

The Registrant's authority to indemnify its directors and officers is governed
by the provisions of Section 145 of the Delaware General Corporation Law, as
follows:

(a)   A corporation shall have the power to indemnify any person who was or is a
      party or is threatened to be made a party to any threatened, pending or
      completed action, suit or proceeding, whether civil, criminal,
      administrative or investigative (other than action by or in the right of
      the corporation) by reason of the fact that he is or was a director,
      officer, employee or agent of the corporation, or is or was serving at the
      request of the corporation as a director, officer, employee or agent of
      another corporation, partnership, joint venture, trust or other
      enterprise, against expenses (including attorneys' fees), judgments, fines
      and amounts paid in settlement actually and reasonably incurred by the
      person in connection with such action, suit or proceeding if he acted in
      good faith and in a manner he reasonably believed to be in or not opposed
      to the best interests of the corporation, and, with respect to any
      criminal action or proceeding, had no reasonable cause to believe his
      conduct was unlawful. The termination of


                                      II-1


      any action, suit or proceeding by judgment, order, settlement, conviction,
      or upon a plea of nolo contendere or its equivalent, shall not, of itself,
      create a presumption that the person did not act in good faith and in a
      manner which he reasonably believed to be in or not opposed to the best
      interests of the corporation, and, with respect to any criminal action or
      proceeding, had reasonable cause to believe that the person's conduct was
      unlawful.

(b)   A corporation shall have the power to indemnify any person who was or is a
      party or is threatened to be made a party to any threatened, pending or
      completed action or suit by or in the right of the corporation to procure
      a judgment in its favor by reason of the fact that he is or was a
      director, officer, employee or agent of the corporation, or is or was
      serving at the request of the corporation as a director, officer, employee
      or agent of another corporation, partnership, joint venture, trust or
      other enterprise against expenses (including attorneys' fees) actually and
      reasonably incurred by the person in connection with the defense or
      settlement of such action or suit if he acted in good faith and in a
      manner he reasonably believed to be in or not opposed to the best
      interests of the corporation and except that no indemnification shall be
      made in respect of any claim, issue or matter as to which such person
      shall have been adjudged to be liable to the corporation unless and only
      to the extent that the Court of Chancery or the court in which such action
      or suit was brought shall determine upon application that, despite the
      adjudication of liability but in view of all the circumstances of the
      case, such person is fairly and reasonably entitled to indemnity for such
      expenses which the Court of Chancery or such other court shall deem
      proper.

(c)   To the extent that a present or former director or officer of a
      corporation has been successful on the merits or otherwise in defense of
      any action, suit or proceeding referred to in subsections (a) and (b) of
      this section, or in defense of any claim, issue or matter therein, such
      person shall be indemnified against expenses (including attorneys' fees)
      actually and reasonably incurred by such person in connection therewith.

(d)   Any indemnification under subsections (a) and (b) of this section (unless
      ordered by a court) shall be made by the corporation only as authorized in
      the specific case upon a determination that indemnification of the present
      or former director, officer, employee or agent is proper in the
      circumstances because he has met the applicable standard of conduct set
      forth in subsections (a) and (b) of this section. Such determination shall
      be made, with respect to a person who is a director or officer at the time
      of such determination (1) by a majority vote of the directors who are not
      parties to such action, suit or proceeding, even though less than a
      quorum, or (2) by a committee of such directors designated by majority
      vote of such directors, even though less than a quorum, or (3) if there
      are no such directors, or if such directors so direct, by independent
      legal counsel in a written opinion, or (4) by the stockholders.

(e)   Expenses (including attorneys' fees) incurred by an officer or director in
      defending a civil or criminal action, suit or proceeding may be paid by
      the corporation in advance of the final disposition or such action, suit
      or proceeding upon receipt of an undertaking by or on behalf of such
      director or officer to repay such amount if it shall ultimately be
      determined that such person is not entitled to be indemnified by the
      corporation as authorized in this section. Such expenses incurred by
      former directors and officers and other employees and agents may be so
      paid upon such terms and conditions, if any, as the corporation deems
      appropriate.

(f)   The indemnification and advancement of expenses provided by, or granted
      pursuant to, the other subsections of this section shall not be deemed
      exclusive of any other rights to which those seeking indemnification or
      advancement of expenses may be entitled under any by, agreement, vote of
      stockholders or disinterested directors or otherwise, both as to action in
      such person's


                                      II-2


      official capacity and as to action in another capacity while holding such
      office.

(g)   A corporation shall have power to purchase and maintain insurance on
      behalf of any person who is or was a director, officer, employee or agent
      of the corporation, or is or was serving at the request of the corporation
      as a director, officer, employee or agent of another corporation,
      partnership, joint venture, trust or other enterprise against any
      liability asserted against such person and incurred by such person in any
      such capacity, or arising out of his status as such, whether or not the
      corporation would have the power to indemnify such person against such
      liability under this section.

(h)   For purposes of this section, references to the "corporation" shall
      include, in addition to the resulting corporation, any constituent
      corporation (including any constituent of a constituent) absorbed in a
      consolidation or merger which, if its separate existence had continued,
      would have had the power and authority to indemnify its directors,
      officers, and employees or agents, so that any person who is or was a
      director, officer, employee or agent of such constituent corporation, or
      is or was serving at the request of such constituent corporation as a
      director, officer, employee or agent of another corporation, partnership,
      joint venture, trust or other enterprise, shall stand in the same position
      under this section with respect to the resulting or surviving corporation
      as such person would have with respect to such constituent corporation if
      its separate existence had continued. (i) For purposes of this section,
      references to "other enterprises" shall include employee benefit plans,
      references to "fines" shall include any excise taxes assessed on a person
      with respect to any employee benefit plan, and references to "serving at
      the request of the corporation" shall include any service as a director,
      officer, employee, or agent with respect to any employee benefit plan, its
      participants or beneficiaries, and a person who acted in good faith and in
      a manner such person reasonably believed to be in the interest of the
      participants and beneficiaries of any employee benefit plan shall be
      deemed to have acted in a manner "not opposed to the best interests of the
      corporation" as referred to in this section.

(j)   The indemnification and advancement of expenses provided by, or granted
      pursuant to, this section shall, unless otherwise provided when authorized
      or ratified, continue as to a person who has ceased to be a director,
      officer, employee or agent and shall inure to the benefit of the heirs,
      executors and administrators of such a person.

(k)   The Court of Chancery is hereby vested with exclusive jurisdiction to hear
      and determine all actions for advancement of expenses or indemnification
      brought under this section, or under any bylaw, agreement, vote of
      stockholders or disinterested directors, or otherwise. The Court of
      Chancery may summarily determine a corporation's obligation to advance
      expenses (including attorneys' fees).

      ITEM 16. EXHIBITS.

      Exhibit No.       Description
      -----------       -----------

      4.1               Securities Purchase Agreement, dated July 30, 2004, by
                        and among the Company and the Purchasers named therein.*

      4.2               Form of Warrant for Common Stock of the Company.*


                                      II-3


      4.3               Registration Rights Agreement, dated July 30, 2004, by
                        and among the Company and the Purchasers named therein.*

      5.1               Opinion of Silverman Sclar Shin & Byrne PLLC, legal
                        counsel.

      23.1              Consent of BDO Seidman, LLP, independent registered
                        public accountants.

      23.2              Consent of Eisner LLP, independent registered public
                        accountants.

      23.2              Consent of Silverman Sclar Shin & Byrne PLLC, legal
                        counsel (included in Exhibit 5.1).

      24.1              Powers of Attorney (included in Signature Pages to this
                        Registration Statement on Form S-3).

----------

* Incorporated by reference from the exhibits to the Registrant's Current Report
on Form 8-K (SEC File No. 1-13441) filed on August 6, 2004.

ITEM 17. UNDERTAKINGS

A. The undersigned registrant hereby undertakes:

(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

      (i) To include any prospectus required by Section 10(a)(3) of the
      Securities Act of 1933;

      (ii) To reflect in the prospectus any facts or events arising after the
      effective date of the registration statement (or the most recent
      post-effective amendment thereof) which, individually or in the aggregate,
      represent a fundamental change in the information set forth in the
      registration statement. Notwithstanding the foregoing, any increase or
      decrease in volume of securities offered (if the total dollar value of
      securities offered would not exceed that which was registered) and any
      deviation from the low or high end of the estimated maximum offering range
      may be reflected in the form of prospectus filed with the Commission
      pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
      price represent no more than 20 percent change in the maximum aggregate
      offering price set forth in the "Calculation of Registration Fee" table in
      the effective registration statement;

      (iii) To include any material information with respect to the plan of
      distribution not previously disclosed in the registration statement or any
      material change to such information in the registration statement.


                                      II-4


(2) That, for the purpose of determining any liability under the Securities Act
of 1933, each such post-effective amendment shall deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

(3) To remove from registration by means of a post-effective amendment any of
the securities being registered which remain unsold at the termination of the
offering.

B. The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

C.Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions or otherwise, the registrant has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act of
1933 and is therefore unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act of 1933, and will be governed by the final adjudication of such issue.


                                      II-5


                                   SIGNATURES

Pursuant to the requirement of the Securities Act of 1933, this Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of Philadelphia, Commonwealth of Pennsylvania, on the 9th
day of September, 2004.

HEMISPHERX BIOPHARMA, INC.
--------------------------
 (Registrant)

 By:  s/William A. Carter
      ------------------------------
      William A. Carter, M.D.,
      Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this registration
statement has been signed by the following persons in the capacities indicated
on the dates indicated.

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below
constitutes and appoints William A. Carter acting alone, his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for such person in his name, place and stead, in any and all capacities, in
connection with the Registrant's registration statement on Form S-3 under the
Securities Act of 1933, including, without limiting the generality of the
foregoing, to sign the registration statement in the name and on behalf of the
Registrant or on behalf of the undersigned as a director or officer of the
Registrant, and any and all amendments or supplements to the registration
statement, including any and all stickers and post-effective amendments to the
registration statement, and to file the same, with all exhibits thereto, and
other documents in connection therewith, with the Securities and Exchange
Commission and any applicable securities exchange or securities self-regulatory
body, granting unto said attorney-in-fact and agents, each acting alone, full
power and authority to do and perform each and every act and thing requisite and
necessary to be done in and about the premises, as fully to all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that said attorneys-in-fact and agents, or their substitutes or substitute, may
lawfully do or cause to be done by virtue hereof.



        Signature                                                Title                                      Date
        ---------                                                -----                                      ----
                                                                                                
/s/William A. Carter                            Chairman of the Board, Chief Executive                September 9, 2004
--------------------------------                Officer (Principal Executive) and Director
William A. Carter, M.D.

                                                Director

/s/Richard C. Piani                                                                                   September 9, 2004
--------------------------------
Richard C. Piani

/s/Robert E. Peterson                                                                                 September 9, 2004
--------------------------------
Robert E. Peterson                              Chief Financial Officer and Chief
                                                Accounting Officer



                                      II-6




        Signature                                                Title                                      Date
        ---------                                                -----                                      ----
                                                                                                
/s/Ransom W. Etheridge                          Secretary, General Counsel And Director
--------------------------------
Ransom W. Etheridge                                                                                   September 9, 2004

/s/William M. Mitchell                          Director
--------------------------------
William M. Mitchell, M.D., Ph.D.                                                                      September 9, 2004

                                                Director
--------------------------------
Iraj-Eqhbal Kiani, M.D.                                                                               September _, 2004

/s/Antoni Esteve                                Director
--------------------------------
Antoni Esteve, Ph.D.                                                                                  September 9, 2004



                                      II-7


Hemispherx Biopharma, Inc.
Form S-3
Index to Exhibits

Exhibit No.       Description
-----------       -----------

5.1               Opinion of Silverman Sclar Shin & Byrne PLLC, legal counsel.

23.1              Consent of BDO Seidman, LLP, independent registered public
                  accountants.

23.2              Consent of Eisner LLP, independent registered public
                  accountants.


                                      II-8