HEMISPHERX BIOPHARMA INC
S-3, 1998-12-08
DRUGS, PROPRIETARIES & DRUGGISTS' SUNDRIES
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    As filed with the Securities and Exchange Commission on December 8, 1998
                                                     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.
                         (Name of Issuer in its charter)

                                    Delaware
         (State or other jurisdiction of incorporation or organization)

            (Primary Standard Industrial Classification Code Number)

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

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

                               1617 JFK Boulevard
                        Philadelphia, Pennsylvania 19103
                                 (215) 988-0080
              (Address and telephone number of principal executive
                    offices and principal place of business)

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

                William A. Carter, M.D., Chief Executive Officer
                           Hemispherx Biopharma, Inc.
                               1617 JFK Boulevard
                        Philadelphia, Pennsylvania 19103
                                 (215) 988-0080
            (Name, address and telephone number of agent for service)

                        Copies of all communications to:
                            Michael H. Freedman, Esq.
                   Silverman, Collura, Chernis & Balzano, P.C.
                        381 Park Avenue South, Suite 1601
                            New York, New York 10016
                                 (212) 779-8600

<PAGE>

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

      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, as amended  ("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. [ ]

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


                                       ii

<PAGE>

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
==============================================================================================
                                                Proposed        Proposed 
                                                Maximum          Maximum 
  Title of Each Class of      Amount to be   Offering Price     Aggregate       Amount of
Securities to be Registered   Registered(1)   Per Share(2)   Offering Price  Registration Fee
==============================================================================================
<S>                              <C>             <C>           <C>              <C>      
Common Stock(3)                  750,000         $6.50         $4,875,000       $1,477.27
- ----------------------------------------------------------------------------------------------
Common Stock(4)                  250,000         $6.50         $1,625,000         $492.42
- ----------------------------------------------------------------------------------------------

- ----------------------------------------------------------------------------------------------
TOTAL                          1,000,000                       $6,500,000       $1,969.70
==============================================================================================
</TABLE>

(1)   Pursuant to Rule 416 of the Securities Act of 1933, as amended,  there are
      also being registered such  indeterminate  number of additional  shares of
      Common Stock as may become  issuable  upon exercise of warrants to prevent
      dilution   resulting  from  stock  splits,   stock  dividends  or  similar
      transactions.

(2)   Common Stock price per share  calculated in accordance with Rule 457(c) of
      the  Securities  Act  using the last sale  price for the  Common  Stock on
      December 7, 1998.

(3)   Common Stock held by Selling Securityholders.

(4)   Common Stock underlying warrants held by Selling Securityholders.

      The Registrant hereby amends this  Registration  Statement on such 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  ("Securities  Act"),  or  until  the
Registration Statement shall become effective on such date as the Securities and
Exchange Commission, acting pursuant to said Section 8(a), may determine.


                                      iii

<PAGE>

      Information  contained  herein is subject to completion  or  amendment.  A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  Prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of any offer to buy nor shall there be any sale of these securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any State.

                                   PROSPECTUS

                  DATED DECEMBER 8, 1998 SUBJECT TO COMPLETION

                           HEMISPHERx BIOPHARMA, INC.

                         750,000 SHARES OF COMMON STOCK
               250,000 SHARES OF COMMON STOCK UNDERLYING WARRANTS

      This  Prospectus  relates to the  possible  resale  from time to time by a
selling securityholder ("Selling Securityholder") of up to (i) 750,000 shares of
Hemispherx  Biopharma,  Inc.  ("Company") common stock, $.001 par value ("Common
Stock");   and  (ii)  250,000  shares  of  Common  Stock   underlying   warrants
("Warrants").  The  Common  Stock  and  shares of Common  Stock  underlying  the
Warrants  are  collectively  referred  to  herein  as  the  "Securities".   This
Prospectus  also relates to such  presently  indeterminate  number of additional
shares of Common Stock as may be issuable upon  exercise of the Warrants,  based
upon stock splits, stock dividends or similar  transactions,  in accordance with
Rule 416 under the Securities Act of 1933, as amended ("Securities Act").

      The Company will not receive any proceeds from the possible resales by the
Selling Securityholders of their respective Securities. The Company will receive
gross proceeds of up to $1,600,000  upon exercise of the Warrants.  There can be
no assurance that any Warrants will be exercised.

      The Selling  Securityholders  may sell their Securities from time to time,
in market  transactions,  in  negotiated  transactions,  through  the writing of
options,  or a combination of such methods of sale, at fixed prices which may be
changed,  at market prices  prevailing at the time of sale, at prices related to
such   prevailing   market   prices  or  at  negotiated   prices.   The  Selling
Securityholders  may effect such  transactions by selling their Securities to or
through broker-dealers,  and such broker-dealers may receive compensation in the
form of discounts,  concessions or commissions from the Selling  Securityholders
and/or the purchasers of such Securities for whom such  broker-dealer may act as
agents or to whom they may sell as principals, or both (which compensation as to
a particular  broker-dealer  might be in excess of customary  commissions.)  The
Company has agreed to bear all expenses in connection  with the  registration of
the Securities to which this Prospectus relates.

      The Company's Common Stock and Class A Warrants are quoted on the American
Stock  Exchange  ("AMEX")  under the symbols HEB and  HEB/WS,  respectively.  On
November  27, 1998 the last sale price of the Common  Stock and Class A Warrants
as reported on AMEX was $7.125 and $3.625, respectively.

THESE  SECURITIES  ARE HIGHLY  SPECULATIVE.  THEY INVOLVE A HIGH DEGREE OF RISK.
THEY SHOULD BE PURCHASED  ONLY BY PERSONS WHO CAN AFFORD TO SUSTAIN A TOTAL LOSS
OF THEIR ENTIRE INVESTMENT (SEE "RISK FACTORS")

<PAGE>

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION, OR ANY STATE SECURITIES COMMISSION,  NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                The date of this Prospectus is December __, 1998


                                       2
<PAGE>

                              AVAILABLE INFORMATION

      The Company is subject to the informational requirements of the Securities
Exchange Act of 1934 (the  "Exchange  Act") and in accordance  therewith,  files
reports, proxy statements and other information with the Securities and Exchange
Commission  (the  "Commission").   Such  reports,  proxy  statements  and  other
information  can be  inspected  and  copied  at the  Commission  at  Room  1024,
Judiciary  Plaza,  450 Fifth Street,  N.W.,  Washington,  D.C. 20549, and at the
Commission's  regional offices at Room 1204,  Everett McKinley Dirksen Building,
219 South Dearborn  Street,  Chicago,  Illinois 60604; and 7 World Trade Center,
Suite  1300,  New York,  New York  10048.  Copies of such  material  can also be
obtained at prescribed rates from the Public Reference Section of the Commission
at its principal office at 450 Fifth Street, N.W., Washington, D.C. 20549.

      This  Prospectus  does not contain all of the information set forth in the
Registration Statements of which this Prospectus is a part and which the Company
has filed with the  Commission.  For  further  information  with  respect to the
Company and the securities offered hereby, reference is made to the Registration
Statement,  including the exhibits filed as a part thereof,  copies of which can
be  inspected  at, or obtained  at  prescribed  rates from the Public  Reference
Section of the  Commission at the address set forth above.  Additional  updating
information  with  respect to the Company may be provided in the future by means
of appendices or supplements to the Prospectus.

      The Company hereby  undertakes to provide without charge to each person to
whom a copy of this  Prospectus  is  delivered,  upon written or oral request of
such person,  a copy of any and all of the  information  that has been or may be
incorporated  herein by reference  (other than exhibits to such documents unless
such exhibits are  specifically  incorporated by reference into such documents).
Requests should be directed to Hemispherx  Biopharma,  Inc., 1617 JFK Boulevard,
Philadelphia, Pennsylvania 19103 (215) 988-0080.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

      The  documents  listed  below  have  been  filed by the  Company  with the
Commission and are incorporated herein by reference:

      (a) The  Company's  Annual  Report on Form 10-K for its fiscal  year ended
December 31, 1997;

      (b) The  Company's  Quarterly  Reports on Form 10-Q for the periods  ended
March 31, 1998, June 30, 1998 and September 30, 1998;

      (c) The Company's  Registration Statement on Form S-3, File No. 333-45677,
which was declared effective by the Commission on February 18, 1998;


                                       3
<PAGE>

      (d) The Company's 1998 Proxy Statement dated May 19, 1998;

      (e)  The  description  of the  Company's  Common  Stock  contained  in the
Company's Registration Statement on Form S-1, Registration No. 33-93314; and

      (h) All other reports  filed by the Company  pursuant to Section 13(a) and
15(d) of the Exchange  Act since the  Company's  fiscal year ended  December 31,
1997.

      All  documents  filed by the  Company  with  the  Commission  pursuant  to
sections 13, 14 or 15(d) of the Exchange Act subsequent hereto, but prior to the
termination  of the  offering of  securities  made by this  Prospectus  shall be
deemed to be incorporated  by reference  herein and to be part hereof from their
respective dates of filing.

      Any statement  contained in a document  incorporated  by reference  herein
shall be deemed to be modified or superseded for purposes of this Prospectus, to
the extent that a statement  contained herein or in any other subsequently filed
document  which  also is or is deemed to be  incorporated  by  reference  herein
modifies  or  supersedes  such  statement.  Any such  statement  so  modified or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Prospectus.


                                       4
<PAGE>

                               PROSPECTUS SUMMARY

      The  following  summary is qualified in its entirety by the more  detailed
information  and  the  Consolidated   Financial  Statements  and  Notes  thereto
appearing  elsewhere or incorporated by reference  elsewhere in this Prospectus,
including information under "Risk Factors".

                                   THE COMPANY

      Hemispherx  Biopharma,  Inc.  ("Company")  has  developed  a large body of
knowledge  in the  development  and  testing of  therapeutic  products  based on
nucleic   acid   technologies.   Ampligen,   its  lead   compound,   a  type  of
double-stranded  RNA,  is in advanced  human  clinical  development  for various
therapeutic indications.  It has been clinically evaluated as an investigational
drug in over 350 patients for different  therapeutic  indications.  The clinical
profile that is emerging from these studies is that the drug has  broad-spectrum
antiviral and immune modulating activity and is generally well tolerated.

      The Company is currently  conducting  Phase III human clinical  trials for
the  therapeutic  treatment of Myalgic  Encephalomyelitis  also known as Chronic
Fatigue  Syndrome  (ME/CFS).  Ampligen  is  also  under  investigation  for  the
treatment of HIV infection. Other disease indications, including hepatitis B and
certain  cancers,  are  targeted  for  further  investigation.  Clinical  trials
conducted in the early 1990's  indicate that Ampligen may have  potential in the
treatment of metastatic  renal cell cancer and malignant  melanoma.  The Company
plans to explore the possibility of partnerships for the further  development in
the treatment of these diseases.

      The Company expects to continue its research and clinical  efforts for the
next  several  years with  significant  benefit  accruing as a result of certain
revenues  expected from various cost  recovery  treatment  programs,  notably in
Canada,  Belgium and the United  States.  However,  the Company may  continue to
incur losses over the next several years due to clinical  costs  incurred in the
continued  development of Ampligen 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  Belgium,  Canada and the United  States.  The
Company is also pursuing similar programs in other countries,  especially within
the  European  Union where  resources  have been  substantially  increased  with
respect to pursuing regulatory approvals.

      As part of its  research  and  development  activities,  the  Company  has
entered  into various  collaborative  and  sponsored  research  agreements  with
researchers,  universities  and government  agencies.  The Company believes that
these  agreements  provide the Company with access to physicians  and scientists
with expertise in the fields of clinical medicine,  virology, molecular biology,
biochemistry, immunology and cellular biology.

      The  Company's  policy  is to file or  license  patent  applications  on a
worldwide basis to protect  technology,  inventories and  improvements  that are
considered  important to the  


                                       5
<PAGE>

development  of its  business.  Over  the  years,  the  Company  has  secured  a
significant  patent estate  consisting  of more than 25 issued U.S.  patents and
over 300 derivative  international  filings. Nine additional U.S. patent filings
are pending along with their international counterparts. These patents primarily
cover the Company's  technology platform that involves  modifications of nucleic
acid polymers to achieve specifically configured base pairs, or to alter nucleic
acid structures to trigger dormant components of the body's own immune/antiviral
system  and/or to inhibit  selectively  certain  human viruses such as hepatitis
viruses,  herpes  viruses,  etc.  Included is a large set of issued  patents and
patent applications from Temple University ("Oragen Technology") which have been
licensed by the Company on an exclusive basis.

      The  development of the Company's  products has required and will continue
to require the commitment of substantial resources to conduct the time-consuming
research,  preclinical  development,  and  clinical  trials  necessary  to bring
pharmaceutical  products  to market  and  establish  commercial  production  and
marketing  capabilities.  Accordingly,  the Company may need to raise additional
funds through  additional equity or debt financing,  collaborative  arrangements
with corporate  partners,  off balance sheet  financing or form other sources in
order to complete the  necessary  clinical  trials and the  regulatory  approval
processes and begin commercializing its products.

Product Development

      In the second  quarter of 1998, the Company  initiated the  recruitment of
clinical  investigators  and ME/CFS  patients  to  participate  in the Phase III
confirmatory  placebo-controlled  clinical study of Ampligen in the treatment of
persons suffering from ME/CFS. The Company has a target of eventually  enrolling
230 patients with the severely debilitating form of ME/CFS. As of November 1998,
the  Company had engaged the  services of six  clinical  investigators  to start
enrolling  patients in the Phase III ME/CFS clinical trial.  The Company expects
to engage  the  services  of eight to ten  investigators  in total by the end of
March 1999.  ME/CFS patients who are not eligible for the Phase III trial in the
United Sates may seek treatment under the ME/CFS Cost Recovery Treatment Program
now authorized by the Food and Drug Administration ("FDA").

      The  Company  has  entered  into  research  agreements  with  LabCorp.,  a
subsidiary  of  Laboratory   Corporation  of  America   (NYSE:LH)  and  Workwell
Corporation  ("Workwell")  to provide  high quality  diagnostic  data during the
Phase III study.  LabCorp will carry out laboratory  diagnostic tests on samples
sent from  clinical  trial sites to its location in Raritan,  NJ.  Workwell will
monitor treadmill oxygen consumption at each clinical trial center. Research and
testing for a specific  biochemical marker (RNase L), an antiviral enzyme,  will
be done by R.E.D.  Laboratories in Brussels.  Initial  research data indicates a
high degree of  correlation  between  levels of this enzyme and the  severity of
ME/CFS. These clinical research partners will help provide  scientifically valid
and quality assured Phase III data in support of securing FDA approval.


                                       6
<PAGE>

      In the first quarter of 1998, the FDA  authorized  expansion of the ME/CFS
cost recovery treatment program. This open treatment protocol with cost recovery
has been  ongoing  since  mid-1997  under the  auspices  of the FDA.  Under this
protocol, the enrolled patients pay for the Ampligen administered,  which totals
about $7,000 for a 24 week treatment course.

      At the end of October  1998,  patients  were also being treated in Belgium
and Austria  pursuant to ME/CFS Cost Recovery  Treatment  Programs.  The Belgium
program was authorized and initiated in 1994. Since inception,  over 60 patients
have  been  treated  in this  program,  which is  similar  to the cost  recovery
treatment program now in process in the United States.  The Company is currently
reviewing the records of new patients for possible inclusion in the program. The
ME/CFS Cost  Recovery  Program was  initiated  in Austria in  September  1998. A
similar ME/CFS Cost Recovery Treatment Program is ongoing in Canada.

Manufacturing

      In 1994,  the Company  entered  into an  agreement  with  Bioclones,  Ltd.
("Bioclones"),  a subsidiary of South African  Breweries,  Ltd., with respect to
the  co-development  of  various  RNA  drugs,   including  Ampligen  ("Bioclones
Agreement").  Pursuant to the Bioclones Agreement,  Ribotech, Ltd. ("Ribotech"),
was  formed in 1994 to produce  the raw  materials  for  Ampligen.  Ribotech  is
jointly owned by Bioclones (75.1%) and the Company (24.9%).

      Ribotech  has  produced raw  materials  that were  accepted for use in the
manufacture  of Ampligen.  The Drug Master File (DMF) has been  submitted to the
FDA.  Ribotech  presently has the capacity to produce the materials  required to
treat approximately  2,000 patients.  Plans for a new production plant are being
developed.  The planned facility will have the capacity to produce the materials
needed to treat up to 50,000 patients.

      A liquid formulation process for Ampligen was initiated at Cook Imaging, a
U.S.  based  facility for  preparing the large volume  parenteral  drug products
under GMP (Good Manufacturing  Practice).  This liquid process is more efficient
and allows for greater volume manufacturing  production needed to meet projected
requirements.  Results  with  the  product  liquid  format  to  date  have  been
encouraging with respect to product  stability and ease of handling.  The liquid
formulation format also eliminates the need for a major pharmacy function nearby
the clinical treatment site.

      In the third  quarter,  the Company  informed the FDA of its  intention to
switch  certain  patients from the labor  intensive  lyophilized  dosage form of
Ampligen  to the more  convenient  ready-to-infuse  liquid  formulation  for the
treatment of patients in clinical trials.  In addition,  the Company submitted a
report  demonstrating  the equivalence of the lyophilized  product to the liquid
product.  This report was based on extensive testing of the liquid product. This
liquid  product  can  be  manufactured  more  efficiently  and  allows  for  the
production  of greater  volumes of the  product.  The Company  will  continue to
produce lyophilized product for further clinical development.


                                       7
<PAGE>

      Ribotech  currently produces the majority of the biochemicals used for the
Company's  drug  substances  and has initiated a program to produce  liquid dose
product.  Ribotech  announced the  completion of their first pilot run of liquid
product  in the  third  quarter.  Product  produced  by  this  run is  currently
undergoing  extensive testing.  In addition to the liquid product,  five lots of
Ampligen were produced in the third quarter. The Company used these five lots to
produce nearly 1,000 doses of lyophilized  product and approximately 3,000 doses
of liquid product.  These doses are to be used in the CFS Cost Recovery Clinical
Treatment Programs in the U.S., Canada,  Belgium and Austria,  as well as in the
U.S. Phase III CFS clinical trials.

      The Company also  received,  tested and released for use in the production
of Ampligen 4 kilograms of raw material from  Pharmacia  Biotech  ("Pharmacia").
Pharmacia was formerly a division of Upjohn and has been a long time supplier of
raw material used in the production of Ampligen. Pharmacia's production capacity
compliments  the  existing  capacity at Ribotech.  Pharmacia  has a small equity
position in the Company.

      The  Company  completed  six (6)  months  of  accelerated  and  long  term
stability  studies on the liquid  formulation  product produced by Cook Imaging.
These stability studies on liquid formulated product are required by the FDA.

      Management has initiated  efforts to identify and locate additional liquid
formulation  capacity in the U.S.  and  Europe.  The  Company  anticipates  that
additional production capacity will be needed in the future.

Distribution/Marketing

      In February 1998, the Company entered into an agreement with Kimberly Home
Health Care,  Inc.  d/b/a Olsten  Health  Services  ("Olsten").  This  agreement
appoints  Olsten as a distributor of products to U.S.  patients  enrolled in the
ME/CFS cost  recovery  protocol  ("AMP 511").  Olsten will  maintain an Ampligen
inventory  for use in treating  these  patients.  In addition,  Olsten agreed to
provide  initially up to $500,000 of support for other clinical  program efforts
including  identification  of the  potential  medical and  economic  benefits to
patients receiving Ampligen. The Company agreed to compensate Olsten for certain
services in connection with conducting certain aspects of the clinical programs.

      Olsten has the  capability  to deliver  treatment  and services to chronic
disease patients  including  infusion  services,  home nursing and other medical
services through a national network of more than 500 locations. Olsten will also
provide various patient education and clinical support services to assist ME/CFS
patients in dealing more effectively  with this disease.  The Company feels that
Olsten's participation completes the product delivery process and uniquely meets
the needs of ME/CFS patients.

      The Company is presently  exploring the  possibility of  distribution  and
marketing relationships for the Western European market.  Negotiations are under
way with a France based multinational pharmaceutical firm.


                                       8
<PAGE>

Europe

      A wholly owned  subsidiary  named  Hemispherx  Biopharma Europe NV/S.A has
been formed in Europe. This European subsidiary is presently based in Antwerp to
serve the needs of the  Company  in  pursuing  ME/CFS  clinical  tests,  related
clinical  treatments  and new drug  marketing  approval  in  Belgium  and  other
European  (European  Union)  countries.  The Company has engaged the services of
several senior  executives and leading  medical experts to pursue this task. The
Company experts to file final drug marketing  approval documents in the European
Union during 1998.

      The European Union ("EU") countries,  consisting of 15 members, are in the
process of establishing a  comprehensive  policy with respect to authorizing the
marketing of new pharmaceutical  products.  Instead of the historical  procedure
whereby  individual  countries  grant  national   authorizations,   the  EU  has
established two systems based on (i) the mutual  recognition of  authorizations;
and (ii) one  single  authorization  to be valid for the 15 member  states.  The
Company is  preparing a submission  to the EU  authorities  (European  Medicines
Evaluation  Agency - EMEA) for approval of Ampligen  specifically  to be used in
the EU for treatment of patients with ME/CFS.  This  submission will contain all
available  information  on the  quality,  safety and  efficacy of Ampligen  with
respect to ME/CFS in the United States and Europe as of a specific date in 1998.
The Company  intends to submit this  application  to the EMEA in December  1998,
following an earlier submission of certain summary documents.

      The  Company  is  also  evaluating  various  European   facilities  to  be
responsible  for  affirming  overall  product  quality  for use in the EU.  This
program may involve  the packing and  distribution  of the product to be used in
the European  Union,  including  product  labeling in the different EU languages
required.

Recent Developments

      On September 14, 1998, VMW, Inc. filed a complaint  against the Company in
the United States District Court,  Southern  District of New York. The complaint
alleges that the Company  failed to fulfill its  financial  obligations  to VMW,
Inc. with respect to a certain  letter  agreement  pertaining to services.  VMW,
Inc.  claims  damages  of less than  $100,000.  The  Company  is  opposing  this
complaint.

      Ell & Co., and the Northern Trust  Company,  as Trustee of the AT&T Master
Pension Trust filed a complaint  against the Company in the Court of Chancery of
the State of Delaware in and for New Castle County on September  23, 1998.  This
complaint  alleges that the Company breached its contractual  obligations as set
forth in the Certificate of Powers, Designations,  Preferences and Rights of the
Series E Convertible Stock of the Company.  The plaintiffs seek to enforce their
rights to convert 1,500 shares of Series E Preferred  Stock into 750,000  shares
of freely traded common stock.  The Company  maintains  that the 1,500 shares of
Series E Preferred  Stock had been  properly  redeemed and that the plaintiff is
not contractually able to effect a proper conversion into common shares.


                                       9
<PAGE>

      The  Company  filed a  complaint  against  Manual  P.  Asensio,  Asensio &
Company,  Inc. and others in the United  States  District  Court for the Eastern
District of Pennsylvania on September 30, 1998. The Company alleges the unlawful
manipulation  and short selling by defendants of the common stock of the Company
on the  American  Stock  Exchange on or about  September  15,  1998  through the
present.   The  Company  alleges,   among  other  things,  that  the  defendants
distributed  materially false information  concerning the Company to the public,
thereby damaging the Company and its shareholder equity.

The Year 2000

      The Company's Year 2000 Compliance Program  ("Program") is steadily moving
forward. The Program was implemented in the spring of 1998 with the objective of
(i) updating and/or  replacing aging  hardware/software;  (ii)  establishing new
platforms  for data bases;  and (iii)  assuring  company-wide  Year 2000 ("Y2K")
compliance.

      With respect to Y2K  compliance,  the Program is  addressing  the issue of
computer  programs  and  embedded  computer  chips being  unable to  distinguish
between  the year 1900 and the year 2000.  The  Program  is  divided  into three
groups:  clinical,   manufacturing  and  financial.   Outside  hardware/software
consultants  have been  employed to review all hardware and software in terms of
Y2K compliance,  as well as upgrades for certain aged equipment.  In most cases,
it appears that the upgrades will solve the Company's potential Y2K problem.

      Solutions for the Company's  clinical  group issues have been  identified.
Management is presently  preparing to present the clinical group proposal to the
Board of Directors at its upcoming 1998 meeting now scheduled in December  1998.
Upon approval,  the  recommendations  could be implemented and in place by March
30, 1999.

      The   Company's    manufacturing    group   has   also    identified   the
hardware/software  to be upgraded to be Y2K  compliant.  The Company has engaged
the  services of a developer  of  integrated  systems to review  these needs and
determine the  hardware/software  best suited to serve the manufacturing process
and  data  base.  The  developer's   recommendations  are  to  be  available  by
mid-December 1998, at which time the Company will take the appropriate  actions.
The Company believes that the  manufacturing  group will be Y2K compliant by May
30, 1999.

      The Company's  financial group has identified minor Y2K  hardware/software
problems and expects to be compliant by December 31, 1998.

      Certain major vendors and suppliers  have been contacted and have provided
certification  that they are Y2K compliant or have provided  reports  reflecting
the status of their Y2K programs.  By mid-December  1998, the Company expects to
have contacted all major vendors with respect to this matter.

      The total cost of the  Program is  unknown at this time,  but the  Company
expects that the cost will range from $150,000 to $200,000.


                                       10
<PAGE>

      The  failure  to  correct  a  material  Y2K  problem  could  result  in an
interruption   in,  or  failure  of,  certain  normal  business   activities  or
operations.  Such failures could  materially and adversely  affect the Company's
results of  operations,  liquidity and financial  condition.  Due to the general
uncertainty inherent in the Y2K problem,  resulting in part from the uncertainty
of the Y2K  readiness of  third-party  suppliers and  customers,  the Company is
unable to determine at this time whether the  consequences  of Y2K failures will
have a material  impact on the Company's  results of  operations,  liquidity and
financial  condition.  The  Program  is  expected  to  significantly  reduce the
Company's level of uncertainty  about the Y2K problem and, in particular,  about
the Y2K compliance and readiness of its material  external  agents.  The Company
believes that, with the implementation of new business systems and completion of
the Program as scheduled, the possibility of significant interruptions of normal
operations should be reduced.


                                       11
<PAGE>

                                  RISK FACTORS

      AN  INVESTMENT IN THE  SECURITIES  OFFERED  HEREBY IS HIGHLY  SPECULATIVE,
INVOLVES  A HIGH  DEGREE OF RISK AND  SHOULD BE MADE ONLY BY  INVESTORS  WHO CAN
AFFORD THE LOSS OF THEIR ENTIRE  INVESTMENT.  PROSPECTIVE  PURCHASERS,  PRIOR TO
MAKING AN  INVESTMENT  DECISION,  SHOULD  CAREFULLY  CONSIDER,  ALONG WITH OTHER
MATTERS REFERRED TO HEREIN, THE FOLLOWING RISK FACTORS:

1.    Dependence on Ampligen; Manufacture of Ampligen; Expiration of Patents.

      The  Company's  principal  development  efforts are  currently  focused on
Ampligen.  While  clinical  trials of Ampligen have to date  produced  favorable
results,  additional  trials  sponsored  by  the  Company  are  planned,  and no
assurance can be given that the drug will  ultimately be demonstrated to be safe
or  efficacious.  In addition,  while  Ampligen has been  authorized  for use in
clinical  trials in the United States and other  countries,  no assurance can be
given that additional clinical trials approvals will be authorized in the United
States or in other countries in a timely fashion or at all or that such clinical
trials  will be  completed  by the  Company.  No  assurance  can be  given  that
commercialization  of Ampligen in any countries  where  Ampligen may be approved
will prove successful. The Company believes that its extensive patent estate may
hinder any  competitors  from testing and  developing  Ampligen  for  particular
indications  since the Company has patented the use of Ampligen for many disease
indications.  The  Company  further  believes  that  the  available  market  for
non-patented  disease  indications  for  Ampligen  which might be  available  to
competitors is minimal since the Company  believes,  based on laboratory  tests,
that Ampligen may not be effective against such disease indications; however, no
assurances  can be given.  Willful  infringement  of the Company's  patents by a
competitor  could result in significant  monetary  damages to the Company in the
event that such  infringement was not enjoined by a court of law.  Nevertheless,
in the event  that the  Company's  patent  protection  is not  adequate  for all
relevant disease  indications,  competitors  might be able to test,  develop and
commercialize Ampligen. Additionally, as a result of the Company's dependence on
Ampligen,  the failure to demonstrate  the drug's safety and efficacy in planned
clinical trials,  to conduct the planned clinical trials,  to obtain  additional
approvals for the drug or to  successfully  commercialize  the drug would have a
materially adverse effect on the Company.

2.    No Assurance of Regulatory Approval; Government Regulation.

      The Company's research, preclinical development,  clinical trials, and the
manufacturing and marketing of its products are subject to extensive  regulation
by numerous governmental authorities in the U.S. and other countries, including,
but not limited to, the Food and Drug  Administration  ("FDA") in the U.S.,  the
Health Protection Branch of Canada's Department of Health and Welfare ("HPB"), a
federal  regulatory agency in Canada, and the European Medical Evaluation Agency
("EMEA") in Europe.  None of the  Company's  products has been approved for full
commercial  sale by the FDA, the HPB, the EMEA or any other  foreign  regulatory


                                       12
<PAGE>

authority  and the  Company  does not  expect to achieve  profitable  operations
unless  Ampligen  receives  final  regulatory  approval  and  is  commercialized
successfully. In order to obtain final regulatory approval of a new drug product
for an  indication,  the Company must  demonstrate  to the  satisfaction  of the
regulatory  agency that such product is safe and effective for its intended uses
and that the Company is capable of  manufacturing  the product to the applicable
regulatory standards.  The process of obtaining required regulatory approvals is
rigorous  and  lengthy  and has  required  and  will  continue  to  require  the
expenditure of substantial resources. There can be no assurance that the Company
will  be able to  obtain  the  necessary  regulatory  approvals.  Unsatisfactory
clinical  trial  results,  clinical  trials not  conducted  in  accordance  with
applicable protocol requirements and/or delays in obtaining regulatory approvals
would  prevent the marketing of products  developed by the Company,  and pending
the receipt of such approvals,  the Company will not receive product revenues or
royalties.

      Pharmaceutical  products  and their  manufacture  are subject to continued
review following regulatory approval,  and later discovery of previously unknown
problems may result in the imposition of  restrictions on such products or their
manufacture,  including  withdrawal of the products from the market.  Failure to
comply with applicable regulatory requirements could, among other things, result
in  fines,  suspension  of  regulatory  approvals,  operating  restrictions  and
criminal prosecution.  The Company cannot predict the extent to which current or
future  government  regulations  might have a materially  adverse  effect on the
production,  marketing and sale of the Company's products.  Such regulations may
delay or prevent clinical trials,  regulatory  approval,  and the manufacture or
marketing of the Company's potential products. In addition,  such regulation may
impose costly procedures upon the Company's  activities or furnish a competitive
advantage to other  companies more  experienced  in regulatory  affairs than the
Company and may deplete the Company's liquidity and capital resources.

3.    Additional Financing Requirements.

      The development of the Company's products has required and may continue to
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  and  to  establish  commercial-sale
production and marketing capabilities.  Based on its current operating plan, the
Company  anticipates  that  projected  cash flow from  operations  and currently
available  financing  arrangements  will be  sufficient  to meet  the  Company's
capital  requirements  for  approximately  30  months  from  the  date  of  this
Prospectus.  The Company's  current cash flow should be sufficient to enable the
Company to complete the necessary clinical trials or regulatory approval process
for Ampligen for any indication or, if any such approval were obtained, to begin
manufacturing or marketing  Ampligen on a commercial  basis. If not, the Company
may need to raise substantial additional funds through additional equity or debt
financing, collaborative arrangements with corporate partners, off balance sheet
financing  or from other  sources in order to complete  the  necessary  clinical
trials and the  regulatory  approval  processes  and begin  commercializing  its
products. If adequate funds are not available from operations and other sources,
and if the  Company  is not able to raise  additional  financing  on  acceptable
terms, the Company's business could be materially adversely affected.


                                       13
<PAGE>

      Moreover, because of the Company's long-term capital requirements,  it may
seek to access the public equity market whenever conditions are favorable,  even
if it does not have an immediate need for additional capital at that time. There
can be no assurance that any additional funding will be available to the Company
on terms acceptable to the Company, if at all. Any additional funding may result
in significant dilution and could involve the issuance of securities with rights
which are senior to those of  existing  stockholders.  The Company may also need
additional funding earlier than anticipated, and the Company's cash requirements
in general may vary  materially from those now planned,  for reasons  including,
but not limited to, changes in the Company's research and development  programs,
clinical trials, competitive and technological advances, the regulatory process,
and higher than anticipated  expenses and lower than  anticipated  revenues from
certain  of the  Company's  clinical  trials  as to  which  cost  recovery  from
participants has been approved.

4.    Uncertainty Regarding Patents and Proprietary Rights.

      The Company's success will depend, in large part, on its ability to obtain
patent  protection  for its  products  and to obtain  and  preserve  proprietary
information  and trade secrets.  Consequently,  the Company's  ability to obtain
exclusive rights for the commercial sale of Ampligen is subject to the Company's
acquisition of enforceable patents covering the use of the drug for a particular
indication.  The Company has been issued certain  patents on the use of Ampligen
alone and Ampligen in combination  with certain other drugs for the treatment of
human  immunodeficiency virus ("HIV"). The Company has also been issued a patent
on the use of Ampligen in combination with certain other drugs for the treatment
of chronic hepatitis B virus ("HBV") and chronic hepatitis C virus ("HCV") and a
patent which affords  protection on the use of Ampligen in patients with myalgic
encephalomyetis,  also know as chronic fatigue syndrome ("ME/CFS"). To date, the
Company has not been  issued any patents in the U.S.  for the use of Ampligen as
monotherapy  for HBV or for any of the  cancers  which the Company has sought to
target.  The Company's  applications for U.S. patents for the use of Ampligen as
monotherapy for HBV and in the treatment of renal cell carcinoma and lung cancer
are  currently  pending,  although no  assurances  can be given that any of such
applications will be approved.  No assurances can be given that competitors will
not seek and obtain patents  regarding the use of Ampligen in  combination  with
various other agents (including AZT) for a particular target indication prior to
the Company.  The Company believes that the existence of the Company's treatment
indication  patents  precludes a competitor from selling an identical or similar
product for the same treatment  indication without infringing upon the Company's
issued patents.  No assurance can be given,  however,  that the Company's patent
protection  will be adequate to prevent the entry into the market of competitors
for all of the Company's treatment indications.

      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. Accordingly, there can be no assurance
that patent  applications  relating to the Company's 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  


                                       14
<PAGE>

anticipated that there may be significant  litigation in the industry  regarding
patent and other  intellectual  property rights and that such  litigation  could
consume substantial resources of the Company. No assurance can be given that the
Company's patents will provide  competitive  advantages for its products or will
not be successfully challenged or circumvented by its competitors.  No assurance
can be given that  patents do not exist or could not be filed which would have a
materially  adverse effect on the Company's ability to market its products or to
obtain or maintain any competitive position the Company may achieve with respect
to its  products.  The  Company's  patents  also  may not  prevent  others  from
developing  competitive  products  using  related  technology.  Other  companies
obtaining patents covering products or processes useful to the Company may bring
infringement  actions  against the Company.  There can be no assurance  that the
Company will have the financial  resources necessary to enforce patent rights it
may hold.  As a result,  the Company may be  required  to obtain  licenses  from
others to develop, manufacture or market its products. There can be no assurance
that the  Company  would be able to obtain  any such  licenses  on  commercially
reasonable   terms,  if  at  all.  The  Company  licenses  certain  patents  and
proprietary   information  from  third  parties,   some  of  which  patents  and
proprietary  information  may have been developed with  government  grants under
circumstances where the government maintained certain rights with respect to the
patents/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 the
Company's  license.  Certain of the  Company's  know-how and  technology  is not
patentable,  particularly  the procedures  for the  manufacture of the Company's
drug product  which are carried out  according to standard  operating  procedure
manuals.  To protect its rights,  the Company has since 1991 required  employees
and consultants to enter into confidentiality agreements with the Company. There
can be no assurance that these agreements will not be breached, that the Company
would have adequate and enforceable  remedies for any breach,  or that any trade
secrets of the  Company  will not  otherwise  become  known or be  independently
developed by competitors.

5.    Disputes and Legal Proceedings Related to Patent Rights.

      The Company's  ownership of one of its patents for the use of Ampligen for
the  treatment  of HIV is the subject of a dispute.  Vanderbilt  University  has
advised the Company of its position that  employees of the  University  were the
inventors of the patent at issue.  The Company does not believe the University's
position to have merit, and if the University filed a claim against the Company,
the Company would vigorously defend against such an action. If such a claim were
filed and if such a claim  were found to have  merit,  the loss of the patent at
issue would not have a materially  adverse  effect on the  Company's  long range
business  since  the  University  would  be able to limit  or  prevent  only the
Company's  use of Ampligen in  combination  with AZT in the treatment of HIV. In
the event that the University  obtained  ownership of the disputed  patent,  the
University  could  license  a third  entity  to  sell  Ampligen  for a  specific
combinational  treatment.  However,  without the Company's consent,  the Company
believes  that the  commercialization  process by a third  party  would  require
substantial   expenditure  to  repeat   clinical  trials  and  establish  a  new
manufacturing  protocol  acceptable to  regulatory  agencies and would require a
license  from  the  Company  for  the  use of  Ampligen  as a  component  of the


                                       15
<PAGE>

combinational requirement. Furthermore, the loss of this patent would not affect
the  Company's  ability  to  market  Ampligen  as a  monotherapy  for HIV  which
treatment the Company has tested and expects to continue to develop.

6.    History of Losses; Future Profitability Uncertain.

      The Company  began  operations  in 1966 and last  reported net profit from
1985 through 1987.  Since 1987, the Company has incurred  substantial  operating
losses and as of  December  31,  1997,  the  Company's  accumulated  deficit was
approximately  $54  million.  The  Company  has  not yet  generated  significant
revenues from its products and could incur  substantial and increased  losses in
the future.  Such losses may  fluctuate  significantly  from quarter to quarter.
There  can be no  assurance  that the  Company  will  ever  achieve  significant
revenues  from product  sales or become  profitable.  The  Company's  ability to
achieve  profitable  operations  is dependent,  in large part,  on  successfully
developing  products,  obtaining  regulatory  approvals on a timely  basis,  and
making the transition  from a research and  development  firm to an organization
producing commercial products or entering into joint ventures or other licensing
arrangements.  No assurance can be given that the Company's product  development
efforts will be successfully  completed,  required regulatory  approvals will be
obtained,  any  products  will be  manufactured  and marketed  successfully,  or
profitability will be achieved.

7.    No Assurance of Successful Product Development.

      The development of new  pharmaceutical  products is subject to a number of
significant  risks.  Potential  products that appear to be promising at an early
stage of  research  or  development  may not  reach the  market  for a number of
reasons.  Potential  products 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  rights of third parties.  The Company's
products are in various stages of clinical and  pre-clinical  development;  each
will  need  to  progress   through  further  clinical  studies  and  appropriate
regulatory  approval  processes  before  any  such  products  can  be  marketed.
Generally,  only a  small  percentage  of  potential  therapeutic  products  are
eventually  approved by the FDA for commercial sale. The transition from limited
production of  pre-clinical  and clinical  research  quantities to production of
commercial quantities of the Company's 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 the Company's efforts 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.

8.    Manufacturing Experience and Capacity.

      Ampligen  is  currently  produced  only  for use in its  clinical  trials,
including the Cost Recovery Clinical Treatment Programs, however, the Company is
engaged with its partner,  Bioclones (as defined  below) and other  suppliers to
increase production capacity.  To be 


                                       16
<PAGE>

successful, the Company's products must be manufactured in commercial quantities
in compliance with regulatory requirements and at acceptable costs. Although the
Company  has  entered  into  an  agreement  with  Bioclones  Proprietary,   Ltd.
("Bioclones"),  a  biopharmaceutical  company  which is  associated  with  South
African Breweries,  Ltd.  (together with Bioclones,  "SAB")(the "SAB Agreement")
which provides for the construction of a new commercial  manufacturing  facility
by a company  which is 24.9% owned by the Company,  no assurance can be given as
to the timing of such construction, and therefore the Company may continue to be
dependent on third  parties for a portion of the  manufacturing  and  production
process.  A pilot  facility  in South  Africa is being  expanded  to  provide an
increased  supply of Ampligen raw material.  The  construction of the commercial
facility is dependent upon the regulatory  status of Ampligen (or other products
covered by the Company's  patents) in various global  markets,  and no assurance
can be given with  respect to when,  and if,  construction  will be initiated or
completed. The Company intends to utilize third-party facilities if and when the
need  arises or, if it is unable to do so, to build or acquire  commercial-scale
manufacturing  facilities.  The  Company  will  need to comply  with  regulatory
requirements  for such  facilities,  including  those of the FDA,  HPB and EMEA,
pertaining to Good Manufacturing Practices ("GMP") regulations.  There can be no
assurance that such  facilities can be used,  built, or acquired on commercially
acceptable  terms, that such facilities,  if used,  built, or acquired,  will be
adequate for the Company's long-term needs. Moreover, 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  manufacture  may affect the chemical  structure of
Ampligen and other such RNA drugs, as well as their safety and efficacy. Changes
in methods of  manufacture,  including  commercial  scale-up,  can,  among other
things,   require  new   clinical   studies  and  affect   orphan  drug  status,
particularly, market exclusivity rights, if any, under the Orphan Drug Act.

9.    Marketing Experience and Capacity.

      The Company currently has limited marketing or sales capability and to the
extent that the Company determines not to, or is unable, to enter into marketing
agreements or third party distribution agreements for its products,  significant
additional  resources may be required to develop a sales force and  distribution
organization.  The Company's  present agreement with Olsten offers the potential
to provide significant marketing and distribution capacity in the United States.
Pursuant to the SAB Agreement,  the corporate  partner will be  responsible  for
fielding  an adequate  sales force in South  America,  Africa,  United  Kingdom,
Australia  and New Zealand.  Nevertheless,  there can be no  assurance  that the
Company will be able to establish such arrangements,  under the SAB Agreement or
otherwise,  on terms  acceptable to the Company,  if at all, or that the cost of
establishing such  arrangements  will not exceed any product  revenues,  or that
such arrangements will be successful. To the extent that the Company enters into
co-marketing  or other  licensing  arrangements,  any  revenues  received by the
Company will be dependent on the efforts of third  parties,  and there can be no
assurance that such efforts will be successful.


                                       17
<PAGE>

10.   Rapid Technological Change and Substantial Competition.

      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 the Company,  as well as  substantial  marketing,  financial and managerial
resources,  and represent significant  competition for the Company.  Acquisition
of, or investments in,  competing  companies by large  pharmaceutical  companies
could increase such competitors' financial, marketing and other resources. There
can be no assurance  that  developments  by others will not render the Company's
products or technologies  obsolete or noncompetitive or that the Company will be
able to keep pace with technological developments. Competitors have developed or
are in the process of developing technologies that are, or in the future may be,
the basis for competitive products.  Some of these products may have an entirely
different  approach or means of  accomplishing  similar  therapeutic  effects to
products being developed by the Company.  These  competing  products may be more
effective and less costly than the Company's products. In addition, conventional
drug therapy,  surgery and other more familiar treatments will offer competition
to the Company's products.  Furthermore,  many of the Company's competitors have
significantly  greater  experience than the Company in pre-clinical  testing and
human clinical trials of pharmaceutical products and in obtaining FDA, HPB, EMEA
and  other  regulatory  approvals  of  products.   Accordingly,   the  Company's
competitors  may succeed in obtaining  FDA, HPB and EMEA product  approvals more
rapidly than the Company.  If any of the Company's  products receive  regulatory
approvals for any indication and the Company  commences  commercial sales of its
products, it will also be competing with respect to manufacturing efficiency and
marketing capabilities,  areas in which it has limited experience. The Company's
competitors  may  possess  or obtain  patent  protection  or other  intellectual
property rights that prevent,  limit or otherwise adversely affect the Company's
ability to develop or exploit its products.

11.   Dependence upon Qualified and Key Personnel.

      Because of the specialized nature of the Company's business, the Company's
success will depend,  among other  things,  on its ability to attract and retain
qualified management and scientific personnel. Competition for such personnel is
intense.  There can be no assurance that the Company will be able to continue to
attract or retain such persons.  The Company currently depends upon the services
of Dr. William A. Carter, its President, Chief Executive Officer and Chairman of
the Board,  Robert E.  Peterson,  its Chief  Financial  Officer and Dr. Carol A.
Smith, the Company's Director of Manufacturing and Process Development.  Certain
key  individuals  upon whom the Company  currently  depends,  including  but not
limited to the Company's Medical Director,  Dr. David Strayer, are not employees
of the  Company.  In  addition,  Dr.  Smith  does not have a written  employment
agreement  with the Company.  The continued  availability  to the Company of the
services of these  individuals  is subject to the  policies  of the  institution
which employs them;  any change in such policies may have an adverse effect upon
the Company's  continued  retention of the services of these individuals.  While
the Company has an  employment  


                                       18
<PAGE>

agreement with Dr. William A. Carter,  and has secured key man life insurance in
the amount of $2 million on the life of Dr.  Carter,  the loss of Dr.  Carter or
other key personnel or of the services of such employees of collaborators or the
failure to  recruit  additional  personnel  as needed  could  have a  materially
adverse  effect  on  the  Company's  ability  to  achieve  its  objectives.  12.
Dependence on Third Parties.

12.   Dependence on Third Parties.

      The Company's strategy for research,  development and commercialization is
to  rely  in  part  upon  collaborative   arrangements  with  third  parties  in
appropriate  circumstances.  The  Company's  strategy  has led it to enter  into
various arrangements with universities,  research groups,  licensors and others.
The  Company  is  dependent  on a number of  important  arrangements  with third
parties.  In  particular,  the Company  utilizes  the  services of  employees at
Allegheny  University  and has  obtained  certain of its  technology  for Oragen
products  through a license  with Temple  University.  There can be no assurance
that the Company will be able to negotiate  additional third party  arrangements
or continue any existing  arrangements on terms acceptable to the Company, if at
all, or that key researchers upon whom the Company is dependent will continue to
be associated with such universities  and/or to work on the Company's  products.
The  loss of any  such  existing  arrangement  or key  researcher  could  have a
materially  adverse  effect on the Company.  The Company may seek a  significant
portion of its future capital requirements from arrangements with pharmaceutical
companies or others  pursuant to arrangements  under which,  among other things,
the  Company  would  receive  payment  for  certain   research  and  development
activities in exchange for future  royalty  payments.  There can be no assurance
that any such  arrangements  will be  established  on a basis  acceptable to the
Company,  if at all, or if established,  will be  scientifically or commercially
successful. The failure to achieve such arrangements on satisfactory terms could
have a materially  adverse effect on the Company.  The Company is dependent upon
certain third party  suppliers for key  components of its proposed  products and
for  substantially  all of the  production  process.  The  failure  to  continue
arrangements  with  such  third  parties  or  obtain   satisfactory   substitute
arrangements could have a materially adverse effect on the Company.

13.   Impact  of  Potential  AMEX  Delisting  on  Marketability  of  Securities;
      Broker-Dealer Sales of the Company's Securities.

      The Company's  Common Stock and Class A Warrants  trade on AMEX.  AMEX has
rules which establish  criteria for the continued listing of securities on AMEX.
Generally,  AMEX will consider delisting or suspending a company based on, among
other things, the following criteria:  stockholders'  equity,  operating losses,
reduced market value of publicly held shares, substantial disposition of assets,
and total number of shareholders.

      If the Company  were to continue to incur  operating  losses,  it might be
unable to maintain the standards for continued listing and the listed securities
could be subject  to  delisting  from  AMEX.  If the  Company's  securities  are
delisted,  an investor  would find it more difficult to dispose of the Company's
securities  or to obtain  accurate  quotations  as to the price of the Company's
securities  and it  could  have  an  adverse  effect  on the  coverage  of  news
concerning 


                                       19
<PAGE>

the Company. In addition, if the Company's securities were delisted,  they would
likely be subject to a rule that imposes additional sales practice  requirements
on  broker-dealers  who sell such  securities to persons other than  established
customers and accredited investors  (accredited  investors are generally persons
having net worth in excess of $1,000,000 or annual income exceeding $200,000, or
$300,000  together with a spouse).  For  transactions  covered by this rule, the
broker-dealer  must make a special  suitability  determination for the purchaser
and must have received the purchaser's  written consent to the transaction prior
to sale,  as well as  disclosing  certain  information  concerning  the risks of
purchasing   low-priced   securities   on  the  market   for  such   securities.
Consequently,  delisting, if it occurred,  would adversely affect the ability of
broker-dealers  to sell the  Company's  securities  and  would  make  subsequent
financing more difficult.

14.   Product Liability Exposure.

      As with most  pharmaceutical  companies,  the  Company  faces an  inherent
business risk of exposure to product  liability claims in the event that the use
of its products  results in adverse  effects.  Such liability  might result from
claims made directly by patients,  hospitals,  clinics or other consumers, or by
pharmaceutical  companies or others manufacturing such products on behalf of the
Company.  While  the  Company  will  continue  to  attempt  to take  appropriate
precautions,  there can be no assurance that it will avoid  significant  product
liability  exposure.  The Company currently maintain worldwide product liability
insurance coverage.

15.   Uncertainty of Health Care Reimbursement and Potential Legislation.

      The  Company's  ability to  successfully  commercialize  its 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.  The Company
cannot  predict  what,  if any,  legislation  will  ultimately be adopted or the
impact  of  such  legislation  on the  Company.  Reimbursement  from  government
agencies may become more restricted in the future.  The Company also understands
that there is  increasing  political  pressure  in Canada to limit  health  care
costs; no assurances can be given that the legislative or regulatory results, if
any,  of  such  pressure  will  not  have  an  adverse  impact  on the  Company.
Furthermore, there can be no assurance that third party insurance companies will
allow the Company to charge and receive payments for its products  sufficient to
realize an  appropriate  return on its  investment in product  development.  The
Company's  potential products  represent a new mode of therapy,  and the Company
expects that the costs associated with purchasing and administering its products
will be  substantial.  There can be no  assurance  that the  Company's  proposed
products,  if  successfully  developed,  will be  considered  cost  effective to
third-party payers, that reimbursement will be available or, if available,  that
the timing and amount of such payors'  reimbursement  will not adversely  affect
the Company's ability to sell its products on a profitable basis.


                                       20
<PAGE>

16.   Hazardous Materials.

      The Company's business involves the controlled use of hazardous materials,
carcinogenic chemicals and various radioactive  compounds.  Although the Company
believes that its 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,  the Company could be held liable for any
damages that result,  and any such liability could be  significant.  The Company
does not maintain  insurance  coverage against such liabilities.  The Company is
also  subject  to a variety of laws and  regulations  relating  to  occupational
health and safety,  environmental  protection,  hazardous substance control, and
waste  management  and  disposal.  The  failure  to  comply  with  any  of  such
regulations could subject the Company to, among other things, third party damage
claims, civil penalties and criminal liability.

17.   Possible Volatility of Stock Price.

      The stock market in general and biotechnology and pharmaceutical stocks in
particular  have  from time to time  experienced  significant  price and  volume
fluctuations  that may be unrelated to the operating  performance  of particular
companies.  The market  price of the Common Stock and  Warrants,  like the stock
prices  of  many  publicly  traded  biotechnology  and  smaller   pharmaceutical
companies, may be highly volatile.  Announcements of technological  innovations,
regulatory matters or new commercial products by the Company or its competitors,
developments  or disputes  concerning  patent or proprietary  rights,  publicity
regarding  actual or  potential  medical  results  relating  to  products  under
development by the Company or its competitors,  regulatory  developments in both
the  U.S.  and  foreign   countries,   public   concern  as  to  the  safety  of
pharmaceutical   products,    economic   and   other   external   factors,   and
period-to-period  fluctuations  in  financial  results,  may have a  significant
impact on the market price of the Common Stock and Warrants.

18.   Shares Eligible for Future Sale; Registration Rights.

      A  substantial  amount  of the  Company's  outstanding  Common  Stock  are
restricted securities, as that term is defined in Rule 144 promulgated under the
Securities Act ("Rule 144"). Absent registration under the Securities Act or the
availability  of an exemption  under the Securities Act, the sale of such shares
is subject to Rule 144. In general,  under Rule 144, subject to the satisfaction
of certain other  conditions,  a person,  including an affiliate of the Company,
who has beneficially  owned  restricted  shares of Common Stock for at least one
year is entitled to sell, within any three-month period, a number of shares that
does not exceed the greater of 1% of the total number of  outstanding  shares of
the same class, if the Common Stock is quoted on a stock  exchange,  the average
weekly  trading  volume  during the four  calendar  weeks  preceding the sale. A
person who presently is not and who has not been an affiliate of the Company for
at least three months  immediately  preceding the sale and who has  beneficially
owned the shares of Common Stock for at least two years is entitled to sell such
shares  under  


                                       21
<PAGE>

Rule 144(k), without regard to any of the volume limitations described above. In
addition, the Company has issued warrants to purchase 2,750,000 shares of Common
Stock ("Rule 701  Warrants") in reliance upon the  provisions of Rule 701 of the
Securities  Act,  pursuant  to which,  in certain  circumstances,  such Rule 701
Warrants  may be sold.  Certain  holders of Common Stock have  executed  lock up
agreements with the Company.  The sale, or availability for sale, of substantial
amounts of the  Company's  securities  in the public  market  subsequent to this
Prospectus,  including the securities  issued  pursuant to Rule 144, Rule 701 or
otherwise, could adversely affect the market price of the Common Stock and could
impair the Company's ability to raise additional capital through the sale of its
equity  securities or debt financing.  The availability of Rule 144 and Rule 701
to the holders of restricted  securities of the Company would be conditioned on,
among other factors,  the availability of certain public information  concerning
the Company.

19.   Exercise of Warrants May Have Dilutive Effect on Market.

      The Warrants provide for, during their term, an opportunity for the holder
to profit from a rise in the market price, of which there is no assurance,  with
resulting  dilution in the  ownership  interest in the Company  held by the then
present  stockholders.  Holders of the Warrants  most likely would  exercise the
Warrants and purchase the underlying Common Stock at a time when the Company may
be able to  obtain  capital  by a new  offering  of  securities  on  terms  more
favorable  than those  provided  by such  Warrants,  in which event the terms on
which the Company  may be able to obtain  additional  capital  would be affected
adversely.

20.   Conflicts of Interest.

      All of the members of the Company's Scientific Advisory Board are employed
other than by the Company and may have  commitments to or consulting or advisory
contracts  with other  entities  (which may include  competitors of the Company)
that may limit  their  availability  to the  Company.  While each  member of the
Company's   Scientific   Advisory  Board  does  execute  a  non-disclosure   and
non-competition  agreement  with  respect  to  proprietary  data  that he or she
receives from the Company,  there can be no assurance that these agreements will
absolutely  protect  the Company  from the results of such data being  revealed,
accidentally or otherwise, by a member of its Scientific Advisory Board.

21.   Historic Absence of Dividends.

      The Company  intends to retain future  earnings,  if any, to provide funds
for the operations of its business and, accordingly,  does not anticipate paying
any cash dividends on its Common Stock in the reasonably foreseeable future. The
last cash dividend was paid to shareholders in 1989.

22.   The Year 2000.

      The use of computer  systems  that rely on  two-digit  programs to perform
computations  or other  functions  may cause such  systems to  malfunction  with
respect to the year 2000 and subsequent  years.  Like many other  entities,  the
Company is currently  assessing its computer  software and database with respect
to its  functionality  beyond the turn of the century.  The 


                                       22
<PAGE>

extent  and  estimated  cost of the  modifications  which will be  required  are
expected to be $150,000 to $200,000, these expenditures will not have a material
effect on the  financial  condition  and results of  operations  of the Company.
There can be no assurance,  however, that the year 2000 problem will be resolved
successfully and in a timely fashion or that any failure or delay by the Company
or any third  parties  which  interact  with the Company in achieving  year 2000
compliance will not have an adverse effect on its operations.


                                       23
<PAGE>

                                 USE OF PROCEEDS

      The  Company  will not  receive  proceeds  from any resale of the  Selling
Securityholder  Securities.  The proceeds to be received by the Company from the
exercise of the Warrants  (assuming all of such securities are exercised),  will
be $1,600,000.  The Company  intends to use such proceeds for general  corporate
purposes.  Pending  use of the  proceeds,  they will be  invested in short term,
interest bearing securities or money market funds.

                                    DILUTION

      The following  discussion is based on the issuance of the Common Stock and
assumes that all of the Warrants are exercised:

      As of September 30, 1998, the net tangible book value of the Common Stock,
based on the balance sheet at September 30, 1998,  was  $14,774,800  or $.60 per
share.  Net tangible book value per share  represents  the amount of the assets,
$17,016,416,  less intangible  assets of $1,325,474 and liabilities of $916,142,
divided by the number of shares  outstanding,  24,692,340.  Without  taking into
account any other  changes in the net tangible  book value of the Company  after
September  30,  1998,  upon the issuance of the Common Stock and the exercise of
the Warrants,  and the receipt of the net proceeds therefrom  ($1,600,000),  the
pro forma net tangible  book value of the Common  Stock,  would be  $16,374,800.
Upon  dividing the pro forma net tangible  book value by the pro forma amount of
Common Stock outstanding (24,942,340), the pro forma net tangible book value per
share is $.66 per share,  representing an immediate increase in the net tangible
book  value  of $.06 per  share to the  present  shareholders.  Dilution  to new
investors,  since new investors will purchase  shares at varying and fluctuating
prices,  represents the difference  between the market price of the Common Stock
and the pro forma net  tangible  book value per share after the  issuance of all
the shares of Common Stock issuable upon exercise of the Warrants.


                                       24
<PAGE>

                       RESALES BY SELLING SECURITYHOLDERS

      This   Prospectus   relates  to  the   proposed   resale  by  the  Selling
Securityholders of the Securities. The following table sets forth as of November
18, 1998 certain information with respect to the persons for whom the Company is
registering  the  Securities  for sale to the public except as footnoted  below.
None of such  persons  has had a  material  relationship  with or has  held  any
position or office with the Company or any of its affiliates within three years,
other than as footnoted  below. The Company will not receive any of the proceeds
from the sale of the  Securities.  If the  Warrants are  exercised,  the Company
would receive $1,600,000.

                               Securities                         Securities
                              Owned Prior       Securities          Owned
                             to Offering(1)   Offered Herein    After Offering
                             --------------   --------------    --------------
Name of Selling            Common                
Securityholders            Stock    Warrants   Common Stock     Amount      %
- ---------------            -----    --------   ------------     ------     ---

Value Management and      750,000    250,000   1,000,000(2)        0        0
 Research AG

(1)   For purposes of this table, a person or group of persons is deemed to have
      "beneficial ownership" of any shares of Common Stock which such person has
      the right to acquire  within 60 days of November 18, 1998. For purposes of
      computing  the  percentage of  outstanding  shares of Common Stock held by
      each  person or group of persons  named  above,  any  security  which such
      person or  persons  has or have the right to acquire  within  such date is
      deemed  to be  outstanding  but is not  deemed to be  outstanding  for the
      purpose of computing the percentage ownership of any other person.  Except
      as  indicated in the  footnotes  to this table and pursuant to  applicable
      community  property  laws,  the  Company  believes  based  on  information
      supplied by such  persons,  that the persons named in this table have sole
      voting and  investment  power with  respect to all shares of Common  Stock
      which they beneficially own.

(2)   Includes (i) 200,000 shares of Common Stock  underlying the Warrants.  The
      Warrants are exercisable  during the five year period commencing April 30,
      1998, at exercise prices ranging from $4.00 to $10.00 per share;  and (ii)
      50,000 shares of Common Stock underlying a Warrant  exercisable during the
      five year period commencing July 10, 1998 at an exercise price of $4.00.


                                       25
<PAGE>

                              PLAN OF DISTRIBUTION

      The Selling  Securityholders may offer and sell shares of Common Stock and
Warrants from time to time in the discretion of the Selling  Securityholders  on
AMEX or in the over-the-counter  market or otherwise at prices and at terms then
prevailing  or at  prices  related  to the  then  current  market  price,  or at
negotiated  prices.  The distribution of the shares of Common Stock and Warrants
may be effected from time to time in one or more transactions including, without
limitation: (a) a block trade in which the broker-dealer so engaged will attempt
to sell the Common  Stock and  Warrants as agent,  but may position and resell a
portion of the block as principal to facilitate the  transaction;  (b) purchases
by a broker or dealer as  principal  and resale by such broker or dealer for its
account pursuant to this  Prospectus;  (c) ordinary  brokerage  transactions and
transactions in which the broker solicits  purchasers;  and (d)  face-to-face or
other direct  transactions  between the Selling  Securityholders  and purchasers
without  a   broker-dealer   or  other   intermediary.   In   effecting   sales,
broker-dealers or agents engaged by the Selling  Securityholders may arrange for
other broker-dealers or agents to participate. From time to time, one or more of
the Selling Securityholders may pledge, hypothecate or grant a security interest
in some or all of the common  Stock  owned by them,  and the  pledgees,  secured
parties or persons to whom such securities have been  hypothecated  shall,  upon
foreclosure  in the event of  default,  be deemed to be Selling  Securityholders
hereunder.  In addition, the Selling  Securityholders may from time to time sell
short the Common Stock of the Company,  and in such  instances,  this Prospectus
may be delivered in connection with such short sale and the Common Stock offered
hereby may be used to cover such short sale.

      Sales of Selling  Securityholders'  Common  Stock and Warrants may also be
made  pursuant  to Rule 144 under the  Securities  Act,  where  applicable.  The
Selling  Securityholders' shares may also be offered in one or more underwritten
offerings,  on a firm commitment or best efforts basis. The Company will receive
no proceeds from the sale of Common Stock by the Selling Securityholders.

      To the extent required under the Securities  Act, the aggregate  amount of
Selling  Securityholders'  Common Stock and Warrants being offered and the terms
of the offering, the names of any such agents, brokers,  dealers or underwriters
and any  applicable  commission  with respect to a particular  offer will be set
forth in an  accompanying  Prospectus  supplement.  Any  underwriters,  dealers,
brokers or agents  participating  in the  distribution  of the Common  Stock and
Warrants  may  receive  compensation  in the  form  of  underwriting  discounts,
concessions, commissions or fees from a Selling Securityholder and/or purchasers
of Selling  Securityholders'  shares of Common Stock and/or  Warrants,  for whom
they may act. In addition,  sellers of Selling Securityholders' shares of Common
Stock and/or Warrants may be deemed to be underwriters  under the Securities Act
and any profits on the sale of Selling  Securityholders'  shares of Common Stock
or  Warrants  by them may be deemed to be  discounts  or  commissions  under the
Securities Act. Selling  Securityholders  may have other business  relationships
with the Company and its  subsidiaries  or affiliates in the ordinary  course of
business.


                                       26
<PAGE>

      From  time  to time  each of the  Selling  Securityholders  may  transfer,
pledge,  donate or assign  Selling  Securityholders'  shares of Common Stock and
Warrants to lenders,  family members and others and each of such persons will be
deemed to be a "Selling  Securityholder"  for purposes of this  Prospectus.  The
number  of  Selling   Securityholders'  shares  of  Common  Stock  and  Warrants
beneficially  owned by those Selling  Securityholders  who so transfer,  pledge,
donate or assign  Selling  Securityholders'  shares of Common  Stock or Warrants
will decrease as and when they take such actions.  The plan of distribution  for
Selling Securityholders' shares of Common Stock and Warrants sold hereunder will
otherwise remain  unchanged,  except that the transferees,  pledgees,  donees or
other successors will be Selling Securityholders hereunder.

      Including,   and  without  limiting  the  foregoing,  in  connection  with
distributions  of the  Common  Stock,  a Selling  Securityholder  may enter into
hedging  transactions with  broker-dealers  and the broker-dealers may engage in
short  sales of the Common  Stock in the course of hedging  the  positions  they
assume with such Selling Securityholder. A Selling Securityholder may also enter
into option or other transactions with  broker-dealers that involve the delivery
of the Common  Stock to the  broker-dealers,  who may then  resell or  otherwise
transfer such Common Stock. A Selling Securityholder may also loan or pledge the
Common Stock to a broker-dealer  and the broker-dealer may sell the Common Stock
so loaned or upon  default may sell or  otherwise  transfer  the pledged  Common
Stock.

      Under  applicable rule and regulations  under the Exchange Act, any person
engaged  in the  distribution  of the Common  Stock may not bid for or  purchase
shares of Common  Stock  during a period  which  commences  one  business day (5
business  days,  if the  Company's  public float is less than $25 million or its
average  daily  trading  volume is less than  $100,000)  prior to such  person's
participation  in the  distribution,  subject to exceptions for certain  passive
market making activities.  In addition and without limiting the foregoing,  each
Selling  Securityholder will be subject to applicable provisions of the Exchange
Act and the rules and regulations  thereunder,  including,  without  limitation,
Regulation M which  provisions  may limit the timing of  purchases  and sales of
shares of the Company's Common Stock by such Selling Securityholder.

      The  Company is bearing  all costs  relating  to the  registration  of the
shares of Common  Stock  (other  than fees and  expenses,  if any, of counsel or
other advisors to the Selling  Securityholders).  Any commissions,  discounts or
other fees payable to  broker-dealers  in connection with any sale of the shares
of Common Stock and Warrants will be borne by the Selling Securityholder selling
such shares of Common Stock or Warrants.

                          TRANSFER AGENT AND REGISTRAR

      The Transfer  Agent and Registrar for the Common Stock and Warrants of the
Company is  Continental  Stock  Transfer & Trust Co., 2 Broadway,  New York, New
York 10004.


                                       27
<PAGE>

                                 LEGAL MATTERS

      The  legality  of the shares  offered  hereby has been passed upon for the
Company by Silverman,  Collura,  Chernis & Balzano, P.C., 381 Park Avenue South,
Suite 1601, New York, New York 10016.

                                    EXPERTS

      The consolidated  financial  statements of the Company and subsidiaries as
of  December  31,  1996 and 1997,  and for each of the  years in the three  year
period ended December 31, 1997, have been  incorporated  by reference  herein in
reliance upon the report of KPMG Peat Marwick LLP, independent  certified public
accountants,  also incorporated by reference  herein,  and upon the authority of
said firm as experts in accounting and auditing.

              DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION
                         FOR SECURITIES ACT LIABILITIES

      Insofar as  indemnification  for liabilities  arising under the Securities
Act may be permitted to  directors,  officers,  and  controlling  persons of the
Company, the Company has been advised that in the opinion of the Commission such
indemnification  is against public policy as expressed in the Securities Act and
is,  therefore  unenforceable.  In the event  that a claim  for  indemnification
against  such  liabilities  (other  than the  payment by the  Company of expense
incurred or paid by a director, officer, or controlling person of the Company in
the  successful  defense of any action,  suit or proceeding) is asserted by such
director,  officer or controlling  person of the Company in connection  with the
securities  being  registered,  the Company  will,  unless in the opinion of its
counsel  the matter has been  settled by a  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 and will be
governed by the final adjudication of such issues.


                                       28
<PAGE>

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

No  dealer,  salesman  or any  other  person  has  been  authorized  to give any
information or to make any  representations  other than those  contained in this
Prospectus in connection with the offer made by this Prospectus and, if given or
made, such information or representations must not be relied upon as having been
authorized by the Company.  Neither the delivery of this Prospectus nor any sale
made hereunder shall under any  circumstances  create any implication that there
has been no change in the affairs of the  Company  since the date  hereof.  This
Prospectus  does not  constitute  an  offer or  solicitation  by  anyone  in any
jurisdiction  in which such offer or  solicitation is not authorized or in which
the person  making such offer or  solicitation  is not  qualified to do so or to
anyone to whom it is unlawful to make such offer or solicitation.

                               TABLE OF CONTENTS

                                                                            Page
                                                                            ----
Available Information........................................................  3
Prospectus Summary...........................................................  5
Risk Factors................................................................. 12
Use of Proceeds.............................................................. 24
Dilution..................................................................... 24
Resales by Selling Securityholders........................................... 25
Plan of Distribution......................................................... 26
Transfer Agent............................................................... 27
Legal Matters................................................................ 28
Experts...................................................................... 28
Disclosure of Commission Position on Indemnification......................... 28
                                           
                              --------------------

Until , 1998 all dealers  effecting  transactions in the registered  securities,
whether or not participating in this distribution,  may be required to deliver a
Prospectus.  This  delivery  requirement  is in  addition to the  obligation  of
dealers to deliver a Prospectus when acting as underwriters  and with respect to
their unsold allotments or subscriptions.


                                       29
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

      SEC Registration Fee                                     $ 2,159.09
      Printing                                                 $ 2,500*
      Legal Fees and Expenses                                  $ 10,000*
      Accounting Fees and Expenses                             $ 2,500*
      Miscellaneous Expenses (including travel     
      and promotional expenses)                                $ 1,000*
               TOTAL                                           $18,159*
                                                
      *Estimated

      The  Selling  Securityholders  will not pay any  portion of the  foregoing
expenses of issuance and distribution.

Item 15. Indemnification of Directors and Officers.

      The  Restated  Certificate  of  Incorporation  of the Company  provides as
follows:

            No person  who is or was a  director  of this  Corporation  shall be
      personally  liable to the  Corporation  or its  stockholders  for monetary
      damages for the breach of any fiduciary  duty as a director,  unless,  and
      only to the extent that, such director is liable (i) for any breach of the
      director's duty of loyalty to the Corporation or its stockholder, (ii) for
      acts or omissions not in good faith or that involve intentional misconduct
      or a knowing  violation  of law,  (iii)  under  Section 174 of the General
      Corporation Law of the State of Delaware, or (iv) for any transaction form
      which the director derived an improper personal benefit.

      Section  145  of the  Delaware  General  Corporation  Law  gives  Delaware
corporations  the power to indemnify  each of the  Company's  present and former
officers and directors under certain circumstances, if such person acted in good
faith and in a manner which he reasonably  believed to be in, or not opposed to,
the best interests of the  corporation.  The Company's  Restated  Certificate of
Incorporation generally requires the Company to indemnify directors and officers
to the fullest extent permissible under Delaware law.

      The Company has entered into  indemnification  agreements with its current
directors  and certain of its  executive  officers.  These  agreements  have the
practical  effect in certain cases of eliminating the ability of stockholders to
collect monetary damages from such individuals.


                                      II-1
<PAGE>

Item 16. Exhibits and Financial Statement Schedule

      (a) The following exhibits are filed herewith:

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

        (1)1.1          Form of Underwriting Agreement

        (1)1.2          Form of Selected Dealer Agreement

        (1)1.3          Form of Agreement Among Underwriters

        (1)3.1          Amended and Restated  Certificate  of  Incorporation  of
                        Registrant,  as  amended,  along  with  Certificates  of
                        Designations, Rights and Preferences of Series A1, A2, B
                        and C Preferred Stock, as amended

        (1)3.2          By-laws of Registrant, as amended

        (2)3.3          Certificate of Designations of Series D Preferred Stock

        (2)3.4          Certificate of Correction to Certificate of Designations
                        of Series D Preferred Stock

        (3)3.5          Certificate of Designations of Series E Preferred Stock

        (1)4.1          Specimen  certificate  representing  Registrant's Common
                        Stock

        (1)4.2          Form of Class A Redeemable Warrant Certificate

        (1)4.3          Form of Underwriter's Unit Option Purchase Agreement

        (1)4.4          Form  of  Class  A  Redeemable  Warrant  Agreement  with
                        Continental Stock Transfer and Trust Company

        5.1             Opinion  of  Silverman,  Collura &  Chernis,  P.C.  with
                        respect to legality of the  securities of the Registrant
                        being registered

        (1)10.1         Registration Rights Agreement, dated as of May 9, 1989

        (1)10.2         Subordination Agreement, dated as of September 18, 1992

        (1)10.3         Series  A1  and  Series  A2  Preferred   Stock  Purchase
                        Agreement, dated as of January 22, 1991

        (1)10.4         Sixth Amendment  Agreement,  dates as of March 31, 1994,
                        amending  the  Series A1 and Series A2  Preferred  Stock
                        Purchase Agreement


                                      II-2
<PAGE>

        (1)10.5         Seventh  Amendment  Agreement,  dated as of  January  1,
                        1995,  amending  the Series A1 and  Series A2  Preferred
                        Stock Purchase Agreement

        (1)10.6         Form of Series C Preferred Stock Subscription Agreement,
                        dated as of June 22, 1993

        (1)10.7         Form of Series C Debt Subscription  Agreement,  dates as
                        of June 30, 1993

        (1)10.8         Form  of Note  issued  with  respect  to  Series  C Debt
                        Subscription Agreement, dated as of June 30, 1993

        (1)10.9         Form of  Warrant  issued  with  respect to Series C Debt
                        Subscription Agreement, dated as of June 30, 1993

        (1)10.10        Cohn Restructuring Agreement, dated as of March 31, 1994

        (1)10.11        Form   of   Warrant   issued   with   respect   to  Cohn
                        Restructuring Agreement, dated as of March 31, 1994

        (1)10.12        Note   issued   with   respect  to  Cohn   Restructuring
                        Agreement, dated as of March 31, 1994

        (1)10.13        Letter  Agreement,  dated  April 14,  1994  between  the
                        Registrant and Maryann Charlap and Promissory Notes

        (1)10.14        Letter  Agreement,  dated July 13, 1994  between  Bridge
                        Ventures, Inc. and the Registrant

        (1)10.15        Letter   Agreement  dated  September  20,  1994  between
                        Maryann Charlap and Lloyd DeVos

        (1)10.16        Letter  Agreement,  dated  November  1,  1994  among the
                        Registrant, Bridge Ventures, Inc. and Myron Cherry

        (1)10.17        Form of Bridge Loan Agreement and Promissory Note

        (1)10.18        [Intentionally left blank]

        (1)10.19        Form of Registration Rights Agreement issued pursuant to
                        1994 Common Stock Financing Subscription Agreement

        (1)10.20        Form of  Proxy  issued  pursuant  to 1994  Common  Stock
                        Financing Subscription Agreement

        (1)10.21        Standby  Financing  Agreement,  dated June 2,  1995,  as
                        amended September 20, 1995


                                      II-3
<PAGE>

        (1)10.22        Tisch/Tsai   Entities  Stock  Pledge  Agreement,   dated
                        February 28, 1995

        (1)10.23        Tisch/Tsai Entities Settlement Agreement, dated February
                        28, 1995

        (1)10.24        Form of Promissory Note with Tisch/Tsai Entities

        (1)10.25        Form of Warrant with Tisch/Tsai Entities

        (1)10.26        Letter  Agreement,   dated  May  4,  12995  between  the
                        Registrant and Gerald Brauser

        (1)10.27        Brauser Note, dated May 2, 1995

        (1)10.28        1990 Stock Option Plan

        (1)10.29        1992 Stock Option Plan

        (1)10.30        1993 Employee Stock Purchase Plan

        (1)10.31        Form  of  Confidentiality,   Invention  and  Non-Compete
                        Agreement

        (1)10.32        Form of Clinical Research Agreement

        (1)10.33        Form of Collaboration Agreement

        (1)10.34        Employment  Agreement by and between the  Registrant and
                        John R. Rapoza, dated May 18, 1992

        (1)10.35        Employment  Agreement by and between the  Registrant and
                        James R. Owen, dated September 21, 1992

        (1)10.36        Amended and Restated Employment Agreement by and between
                        the  Registrant  and Dr.  William A. Cater,  dated as of
                        July 1, 1993

        (1)10.37        Employment  Agreement  by  and  between  Registrant  and
                        Harris Freedman, dated August 1, 1994

        (1)10.38        Employment  Agreement by and between the  Registrant and
                        Sharon Will, dated August 1 1994

        (1)10.39        License  Agreement by and between the Registrant and the
                        Johns Hopkins University, dated December 31, 1980

        (1)10.40        Technology Transfer, Patent License and Supply Agreement
                        by   and   between   the   Registrant,   Pharmacia   LKB
                        Biotechnology Inc.,  Pharmacio P-L Biochemicals Inc. and
                        E.I. du Pont de Nemours and Company,  dated November 24,
                        1987


                                      II-4
<PAGE>

        (1)10.41        Pharmaceutical   Use  Agreement,   by  and  between  the
                        Registrant and Temple University, dated August 3, 1988

        (1)10.42        Assignment and Research Support Agreement by and between
                        the  Registrant,  Hahnemann  University  and  Dr.  David
                        Strayer,  Dr. Isadore  Brodsky and Dr. David  Gillespie,
                        dated June 30, 1989

        (1)10.43        Lease Agreement  between the Registrant and Red Gate III
                        Limited Partnership, dated November 1, 1989, relating to
                        the Registrant's Rockville, Maryland facility

        (1)10.44        Fee Agreement between the Registrant and Choate,  Hall &
                        Stewart, dated January 27, 1993

        (1)10.45        Settlement and Release  Agreement between the Registrant
                        and Lloyd DeVos, dated August 18, 1994

        (1)10.46        Agreement   between   the   Registrant   and   Bioclones
                        (Proprietary) Limited

        (1)10.47        Licensing Agreement with Core BioTech Corp.

        (1)10.48        Licensing Agreement with BioPro Corp.

        (1)10.49        Licensing Agreement with BioAegean Corp.

        (1)10.50        Letter  Agreement,  dated  may  12,  1992,  between  the
                        Registrant and Dr. Werner E.G. Muller

        (1)10.51        Amendment,  dated August 3, 1995,  to Agreement  between
                        the  Registrant  and  Bioclones   (Proprietary)  Limited
                        (contained in Exhibit 10.46)

        (1)10.52        Agreement,  dated July 16, 1995, between the Registrant,
                        Vernacular Communications,  Inc. Gerald Souham, Mitchell
                        L. Reisman, Craig S. O'Keefe and Robert C. Conaboy

        (1)10.53        Agreement,  dated June 27, 1995,  between the Registrant
                        and The Sage Group

        (1)10.54        Form of Indemnification Agreement

        (1)10.55        Agreement,   dated  September  13,  1995,   between  the
                        Registrant and River Pharma Inc.

        (2)10.56        Series D Preferred Stock Subscription  Agreement,  dated
                        June 28, 1996

        (2)10.57        Series D Preferred Stock Registration  Rights Agreement,
                        dated June 28, 1996


                                      II-5
<PAGE>

        (2)10.58        GFL  Advantage   Fund  Limited   Common  Stock  Purchase
                        Warrant, dated June 28, 1996

        (3)10.59        Series E Preferred Stock Registration Rights Agreement

        10.60           Value Management & Research,  AG Subscription  Agreement
                        dated July 20, 1998

        (1)11           Calculation of Earnings Per Share

        (1)14.1         Material Foreign Patents

        (1)21           Subsidiaries of the Registrant

        23.1            Consent of Silverman,  Collura,  Chernis & Balzano, P.C.
                        (included in Exhibit 5.1)

        23.2            Consent of KMPG Peat Marwick LLP


(1)   Incorporated  by reference  from the Company's  Registration  Statement on
      Form S-1 (Registration No. 33-93314)  declared effective by the Securities
      and Exchange Commission on November 2, 1995.

(2)   Incorporated  by reference  from the Company's  Registration  Statement on
      Form S-1 (Registration No. 333-8941)  declared effective by the Securities
      and Exchange Commission on September 16, 1996.

(3)   Incorporated  by reference  from the Company's  Registration  Statement on
      Form S-1 (Registration No. 333-24983) declared effective by the Securities
      and Exchange Commission on April 18, 1997.

      b.    Financial Statement Schedules.

      All schedules are omitted from this  Registration  Statement  because they
are not required or the  required  information  is included in the  Consolidated
Financial Statement or the Notes thereto.

Item 17. Undertakings.

      (a)   Rule 415 Offerings.

      The undersigned issuer hereby undertakes that it will:

      (1) File,  during  any  period in which it offers or sells  securities,  a
post-effective amendment to this Registration Statement to:


                                      II-6
<PAGE>

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

      (ii) Reflect in the prospectus any facts or events which,  individually or
      together,  represent  a  fundamental  change  in  the  information  in the
      Registration Statement; and

      (iii) Includes any additional or changed material  information on the plan
      of distribution.

provided,  however,  the paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
Registration  Statement is on Form S-3 or Form S-8, and the information required
in a  post-effective  amendment  by those  paragraphs  is  contained in periodic
reports filed by the  Registrant  pursuant to Section 13 or Section 15(d) of the
Securities  Exchange  Act of 1934  that are  incorporated  by  reference  in the
Registration Statement.

      (2) For  determining  liability  under  the  Securities  Act,  treat  each
post-effective  amendment  as a new  registration  statement  of the  securities
offered,  and the offering of the securities at that time to be the initial bona
fide offering.

      (3) File a post-effective amendment to remove from registration any of the
securities that remain unsold at the end of the offering.

      (b)   Request for acceleration of effective date.

      (1)  Insofar  as  indemnification   for  liabilities   arising  under  the
Securities Act, may be permitted to directors,  officers and controlling persons
of the small business issuer pursuant to the foregoing provisions, or otherwise,
the issuer 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 and is, therefore,  unenforceable.  In the event that a claim for
indemnification  against such liabilities  (other than the payment by the issuer
of expenses incurred or paid by a director, officer or controlling person of the
issuer in the successful defense of any action, suit or proceedings) is asserted
by  such  director,  officer  or  controlling  person  in  connection  with  the
securities  being  registered,  the issuer  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 and will be governed by
the final adjudication of such court.

      (2) For  determining  any liability  under the Securities  Act, treat each
post-effective   amendment   that  contains  a  form  of  prospectus  as  a  new
registration statement for the securities offered in the registration statement,
and that  offering  of the  securities  at that  time as the  initial  bona fide
offering of those securities.


                                      II-7
<PAGE>

                                   SIGNATURES

      In accordance with the  requirements of the Securities Act, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements of filing on Form S-1 and authorized this registration statement to
be signed on its behalf by the undersigned,  in the City of Philadelphia,  State
of Pennsylvania, on November 30, 1998.

                                    HEMISPHERX BIOPHARMA, INC.

                                    By: /s/ William A. Carter
                                        ----------------------------------------
                                        William A. Carter, President and CEO

      In  accordance   with  the   requirements  of  the  Securities  Act,  this
Registration statement was signed by the following persons in the capacities and
on the dates stated.

      Signature                      Title                           Date
      ---------                      -----                           ----

                           Principal Executive Officer
                           and Chairman of the Board
/s/ William A. Carter      and as Power of Attorney
- ------------------------   for Members of the Board            November 30, 1998
William A. Carter, M.D.

/s/ Robert E. Peterson     Principal Financial Officer and
- ------------------------   Principal Accounting Officer        November 30, 1998
Robert E. Peterson

/s/ Richard C. Piani       Director                            November 23, 1998
- ------------------------
Richard C. Piani

/s/ Ransom W. Etheridge    Director                            November 25, 1998
- ------------------------
Ransom W. Etheridge

/s/ William Mitchell       Director                            November 24, 1998
- ------------------------
William Mitchell


                                      II-8


                                                                     Exhibit 5.1

           [Letterhead of Silverman, Collura, Chernis & Balzano P.C.]

                                       December 8, 1998

Hemispherx Biopharma, Inc.
1617 JFK Boulevard
Philadelphia, Pennsylvania 19103

         Re: Registration Statement on Form S-3

Gentlemen:

      We have acted as counsel to  Hemispherx  Biopharma,  Inc.  ("Company"),  a
Delaware corporation,  pursuant to Registration  Statement on Form S-3, as filed
with the Securities and Exchange  Commission on December 8, 1998  ("Registration
Statement"),  covering (i) 750,000 shares of the Company's  common stock,  $.001
par value ("Common  Stock");  and (ii) 250,000 shares of Common Stock underlying
warrants.

      In acting as counsel  for the  Company  and  arriving  at the  opinions as
expressed below, we have examined and relied upon originals or copies, certified
or otherwise  identified  to our  satisfaction,  of such records of the Company,
agreements and other instruments,  certificates of officers and  representatives
of the Company,  certificates of public officials and other documents as we have
deemed necessary or appropriate as a basis for the opinions expressed herein.

      In connection  with our examination we have assumed the genuineness of all
signatures,  the authenticity of all documents tendered to us as originals,  the
legal capacity of natural  persons and the  conformity to original  documents of
all documents submitted to us as certified or photostated copies.

      Based on the foregoing,  and subject to the qualifications and limitations
set forth herein, it is our opinion that:

         1. The Company has  authority  to issue the Common  Stock in the manner
and under the terms set forth in the Registration Statement.

         2. The Common  Stock has been duly  authorized  and is validly  issued,
fully paid and  non-assessable.  The Common Stock  underlying  the warrants have
been duly authorized 

<PAGE>

Hemispherx Biopharma, Inc.
December 8, 1998
Page 2


and when issued,  delivered and paid for in accordance  with the warrants' terms
terms, will be validly issued, fully paid and non-assessable.

      We  express no  opinion  with  respect to the laws other than those of the
State of New York and  Federal  Laws of the  United  States of  America,  and we
assume no responsibility as to the applicability thereto, or the effect thereon,
of the laws of any other jurisdiction.

      We hereby  consent  to the filing of this  opinion  as Exhibit  5.1 to the
Registration Statement and its use as part of the Registration Statement.

      We are  furnishing  this opinion to the Company  solely for its benefit in
connection with the Registration  Statement.  It is not to be used,  circulated,
quoted or otherwise  referred to for any other purpose.  Other than the Company,
no one is entitled to rely on this opinion.

                                Very truly yours,

                                SILVERMAN, COLLURA, CHERNIS
                                        & BALZANO, P.C.

                                /s/ Silverman, Collura, Chernis & Balzano P.C.



                                                                   Exhibit 10.60

                               ACCREDITED INVESTOR
                             SUBSCRIPTION AGREEMENT

                         Subscription Agreement for the
               Purchase of Hemispherx Biopharma, Inc. Common Stock

      Subject to the terms and conditions  hereof,  Value  Management & Research
("Undersigned"),  hereby  irrevocably  subscribes  for and agrees to purchase an
aggregate  of  750,000  shares  ("Shares")  of the  common  stock of  Hemispherx
Biopharma,  Inc.  ("Company")  at a  purchase  price of  $3.00  per  Share.  The
Undersigned  agrees to purchase  400,000 of the Shares as of the date hereof and
350,000  of the  Shares  no later  than  September  15,  1998.  The  Undersigned
irrevocably  agrees to tender payment in the amount of $1,200,000 to the Company
for the payment of 400,000 Shares upon execution of this Subscription Agreement,
and $1,050,000, representing payment for 350,000 Shares, no later than September
15,  1998.  Time is of the essence.  The purchase  price shall be paid by check,
subject  to  collection,  or by wire  transfer,  made  payable  to the  order of
"Silverman,  Collura, Chernis & Balzano, Escrow Account". The Company shall have
the right to reject this subscription in whole or in part. In the event that the
Company  rejects the  subscription  in whole or in part, the Company shall cause
the entire  purchase  price (if the  subscription  is rejected in whole) or that
portion  thereof   corresponding  to  the  Shares  not  sold  pursuant  to  this
subscription  agreement (if the subscription is rejected in part) to be returned
to the Undersigned forthwith.

1. The Undersigned,  in order to induce the Company to accept this  subscription
agreement represents, warrants and covenants to the Company as follows:

      (a) The Undersigned acknowledges that the Shares being purchased hereunder
have  not  been  registered  under  the  Securities  Act  of  1933,  as  amended
("Securities  Act"),  or the  securities  laws  of any  State;  (ii)  absent  an
exemption  from  registration  contained in those laws, the issuance and sale of
the Shares require registration;  and (iii) the Company's reliance upon any such
exemption  is   invariably   based  upon  the   Undersigned's   representations,
warranties,  and agreements  contained in the Subscription  Agreement.

      (b) The Undersigned  agrees that this Subscription  Agreement is and shall
be irrevocable unless it has not been accepted by the Company.

      (c) The  Undersigned  has carefully read and  considered  all  disclosures
contained  in the  Company's  Annual  Report  on Form  10-K for the  year  ended
December  31,  1997 and the  Company's  Quarterly  Report  on Form  10-Q for the
quarterly period ended March 31, 1998 (collectively the "Exchange Act Reports").
The  undersigned  understands  that an investment in 

<PAGE>

the Shares or a speculative  investments with a high degree of risk of loss, and
there are substantial  restrictions on the  transferability  of the Shares.  The
Undersigned  acknowledges  that no  offering  memorandum  has  been  distributed
regarding the Shares and that the  Undersigned has been given the opportunity to
ask questions of, and receive answers from, the Company concerning the terms and
conditions of this Subscription  Agreement and to obtain such additional written
information, to the extent the Company possesses such information or can acquire
it without  unreasonable effort or expense,  necessary to verify the accuracy of
same,  as the  Undersigned  desires in order to  evaluate  the  investment.  The
Undersigned   further   acknowledges   that  the  Undersigned  has  received  no
representations or warranties from the Company, or their respective employees or
agents in making this investment decision.

      (d) The Undersigned acknowledges that the Undersigned has investigated the
Company's  business,  financial  conditions,  current state of affairs,  planned
business and other  matters  necessary in order for the  Undersigned  to make an
informed investment decision regarding the purchase of the Shares.

      (e) The  Undersigned  acknowledges  that the Undersigned is purchasing the
Shares without being  furnished any prospectus,  offering  memorandum or written
description of the Company, its business and/or its future plans, and has relied
solely upon the Exchange  Act Reports and the  Undersigned's  own  investigation
into the Company and its proposed operations.

      (f) The  Undersigned  is  aware  that  the  purchase  of the  Shares  is a
speculative  investment  involving  a high  degree of risk and that  there is no
guarantee that the Undersigned will realize any gain from this  investment,  and
that the entire investment could be lost.

      (g) The Undersigned  understands  that no federal or state agency has made
any finding or  determination  regarding the fairness of this  Offering,  or any
recommendation or endorsement of this Offering.

      (h) The  Undersigned  is purchasing the Shares for the  Undersigned's  own
account, with the intention of holding the Security with no present intention of
dividing or allowing others to participate in this investment or of reselling or
otherwise  participating,  directly  or  indirectly,  


                                       2
<PAGE>

in a distribution  of the Security,  and shall not make any sale,  transfer,  or
pledge thereof without  registration under the Securities Act and any applicable
securities  laws of any  state or  unless  an  exemption  from  registration  is
available under those laws.

      (i) The Undersigned will not sell short in any manner the Shares.

      (j) The Undersigned is financially  able to bear the economic risk of this
investment, including the ability to hold the Shares indefinitely or to afford a
complete loss of the Undersigned's investment in the Shares.

      (k) The Undersigned  represents that the Undersigned's  overall commitment
to investments which are not readily marketable is not  disproportionate  to its
net worth,  and the  investment  in the  Securities  will not cause such overall
commitment to become excessive.  The Undersigned  understands that the statutory
basis on which the Shares are being sold to the  Undersigned to others would not
be available if the Undersigned's  present intention were to hold the Shares for
a fixed  period or until the  occurrence  of a certain  event.  The  Undersigned
realizes that in the view of the Securities and Exchange Commission,  a purchase
now with a  present  intent  to  resell  by  reason  of a  foreseeable  specific
contingency or any  anticipated  change in the market value, or in the condition
of the Company,  or that of the industry in which the business of the Company is
engaged or in connection with a contemplated  liquidation,  or settlement of any
loan obtained by the  Undersigned  for the  acquisition  of the Shares,  and for
which such Shares may be pledged as security or as  donations  to  religious  or
charitable institutions for the purpose of securing a deduction on an income tax
return,  would, in fact,  represent a purchase with an intent  inconsistent with
the  Undersigned's  representations  to the  Company,  and  the  Securities  and
Exchange  Commission  would then regard such sale as one for which no  exemption
from  registration is available.  The Undersigned  will not pledge,  transfer or
assign this Subscription Agreement.

      (l) The Undersigned represents that the funds provided for this investment
are either separate  property of the Undersigned,  other property over which the
Undersigned  has the right of control,  or are  otherwise  funds as to which the
Undersigned has the sole right of management.


                                       3
<PAGE>

      (m) The address shown under the Undersigned's signature at the end of this
Subscription  Agreement is the  Undersigned's  principal  business  address if a
corporation or other entity.

      (n) The  Undersigned  has such  knowledge and  experience in financial and
business  matters  as to be  capable  of  evaluating  the merits and risks of an
investment in the Shares.

      (o) The Undersigned  acknowledges that the certificates for the securities
comprising the Shares which the  Undersigned  will receive will contain a legend
substantially as follows:

      THE SECURITIES  WHICH ARE  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT BEEN
      REGISTERED  UNDER THE SECURITIES  ACT OF 1933, AS AMENDED.  THE SECURITIES
      HAVE BEEN  ACQUIRED FOR  INVESTMENT  PURPOSES  ONLY AND NOT WITH A VIEW TO
      DISTRIBUTION OR RESALE, AND MAY NOT BE SOLD, TRANSFERRED,  MADE SUBJECT TO
      A SECURITY INTEREST, PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF UNLESS
      AND UNTIL REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR AN
      OPINION OF COUNSEL FOR THE COMPANY IS RECEIVED  THAT  REGISTRATION  IS NOT
      REQUIRED UNDER SUCH ACT.

      (p) This Subscription  Agreement and all  representations,  warranties and
statements made by the Undersigned herein are true,  complete and correct in all
material respects.

      (q) The  Undersigned  acknowledges  that the Company,  except as set forth
below, is under no obligation to register the Shares under the Securities Act or
any state  securities laws, or to take any action to make any exemption from any
such registration provisions available.


                                       4
<PAGE>

      (r) This  Subscription  Agreement is a legally  binding  obligation of the
Undersigned in accordance with its terms.

      (s) The  Undersigned is an "accredited  investor," as such term is defined
in Regulation D of the Rules and Regulations promulgated under the Act.

      (t) If the  Undersigned  is a  partnership,  corporation,  trust  or other
entity,  (i) the  Undersigned  has  enclosed  with this  Subscription  Agreement
appropriate   evidence  of  the  authority  of  the  individual  executing  this
Subscription  Agreement to act on its behalf (e.g., if a trust, a certified copy
of the trust  agreement;  if a  corporation,  a certified  corporate  resolution
authorizing the signature and a certified copy of the articles of incorporation;
or if a partnership,  a certified copy of the partnership  agreement),  (ii) the
Undersigned represents and warrants that it was not organized or reorganized for
the specific purpose of acquiring Shares, and (iii) the Undersigned has the full
power and  authority  to execute this  Subscription  Agreement on behalf of such
entity and to make the representations and warranties made herein on its behalf,
and (iv) this investment in the Company has been  affirmatively  authorized,  if
required,  by the  governing  board of such entity and is not  prohibited by the
governing documents of the entity.

      (u) The Undersigned expressly  acknowledges and agrees that the Company is
relying upon the  Undersigned's  representation  contained  in the  Subscription
Agreement.   The  Undersigned  subscriber   acknowledges  that  the  Undersigned
understands  the  meaning  and legal  consequences  of the  representations  and
warranties which are contained  herein and hereby agrees to indemnify,  save and
hold the Company, and their respective officers,  directors and counsel harmless
from and  against  any and all claims or actions  arising out of a breach of any
representation,  warranty or acknowledgement of the Undersigned contained in the
Subscription Agreement. Such indemnification shall be deemed to include not only
the specific  liabilities or obligation  with respect to which such indemnity is
provided, but also all reasonable costs, expenses,  counsel fees and expenses of
settlement  relating  thereto,  whether or not any such  liability or obligation
shall have been reduced to judgment.

      (v) Except as  otherwise  specifically  provided for  hereunder,  no party
shall be deemed to have  waived  any of his or her or its  rights  hereunder  or
under  any other  agreement,  instrument  or  papers  signed by any of them with
respect to the subject  matter hereof unless such waiver is in writing signed by
the party  waiving said right.  A waiver on any one occasion with 


                                       5
<PAGE>

respect to the subject  matter  hereof  shall not be  construed  as a bar to, or
waiver of, any right or remedy on any future  occasion.  All rights and remedies
with respect to the subject matter hereof,  whether  evidenced  hereby or by any
other agreement,  instrument, or paper, will be cumulative, and may be exercised
separately or concurrently.

      (w) The  parties  have not made any  representations  or  warranties  with
respect to the subject matter hereof not set forth herein, and this Subscription
Agreement,  together  with any  instruments  executed  simultaneously  herewith,
constitutes the entire agreement between them with respect to the subject matter
hereof.  All  understandings  and agreements  heretofore had between the parties
with  respect to the  subject  matter  hereof  are  merged in this  Subscription
Agreement and any such  instrument,  which alone fully and completely  expresses
their agreement.

      (x) This Agreement may not be changed, modified,  extended,  terminated or
discharged orally,  but only by an agreement in writing,  which is signed by all
of the parties to this Agreement.

      (y) The  parties  agree to  execute  any and all such  other  and  further
instruments  and  documents,  and to  take  any  and all  such  further  actions
reasonably required to effectuate this Subscription Agreement and the intent and
purposes hereof.

      (z) This  Subscription  Agreement  shall be governed by and  construed  in
accordance  with the laws of the  State of New York and the  Undersigned  hereby
consents to the  jurisdiction  of the courts of the State of New York and/or the
United States District Court for the Southern District of New York.

      (aa) The  Undersigned  understands  that this  subscription is not binding
upon the Company until the Company  accepts it, which  acceptance is at the sole
discretion of the Company and is to be evidenced by the  Company's  execution of
this Subscription  Agreement where indicated.  This Subscription Agreement shall
be null and void if the Company does not accept it as aforesaid.


                                       6
<PAGE>

      (bb)  The  Undersigned  understands  that  the  Company  may,  in its sole
discretion,  reject this  subscription  and,  in the event that the  offering to
which this Subscription  relates is oversubscribed,  reduce this subscription in
any amount and to any extent, whether or not pro rata reductions are made of any
other investor's subscription.

      (cc)  Neither  this  Subscription  Agreement  nor any of the rights of the
Undersigned hereunder may be transferred or assigned by the Undersigned.

      (dd) Please  check  whether one or more of the  following  definitions  of
"accredited  investor," if any, applies to you. If none of the following applies
to you, please leave a blank.

         (i) A Bank as defined in Section  3(a)(2) of the Securities Act, or any
savings  and loan  association  or  other  institution  as  defined  in  Section
3(a)(5)(A) of the  Securities  Act whether acting in its individual or fiduciary
capacity;  any  broker  or  dealer  registered  pursuant  to  Section  15 of the
Securities  Exchange Act of 1934, as amended (the "Exchange  Act"); an insurance
company as defined in Section 2(13) of the Securities Act; an investment company
registered  under the Investment  Company Act of 1940 or a business  development
company as defined in Section 2(a)(48) of that act; a Small Business  Investment
Company licensed by the U.S. Small Business  Administration under Section 301(c)
or (d) of the Small Business  Investment Act of 1958; any plan  established  and
maintained  by a  state,  or  its  political  subdivisions,  or  any  agency  or
instrumentality of a state or its political  subdivisions for the benefit of its
employees,  if such plan has total assets in excess of $5,000,000;  any employee
benefit plan within the meaning of the Employee  Retirement  Income Security Act
of 1974, if the investment  decision is made by a plan fiduciary,  as defined in
Section 3(21) of such act, which is either a bank, savings and loan association,
insurance company, or registered  investment advisor, or if the employee benefit
plan has total assets in excess of $5,000,000 or, if a self-directed  plan, with
investment decisions made solely by persons that are Accredited Investors.

         (ii) A Private  Business  Development  Company  as  defined  in Section
202(a)(22) of the Investment Advisers Act of 1940.

         (iii) An  organization  described in Section  501(c)(3) of the Internal
Revenue  Code or  corporation,  Massachusetts  or  similar  business  trust,  or
partnership,  not formed for the specific  purpose of acquiring  the  securities
offered, with total assets in excess of $5,000,000.


                                       7
<PAGE>

         (iv) A natural person whose  individual  net worth,  or joint net worth
with that person's spouse, at the time of purchase exceeds $1,000,000.

         (v) A natural person who had an individual income in excess of $200,000
in each of the two most recent years or joint income with that  person's  spouse
in excess of $300,000 in each of those years and has a reasonable expectation of
reaching the same income level in the current year.

         (vi) Any trust,  with total assets in excess of $5,000,000,  not formed
for the specific purpose of acquiring the Shares,  whose purchase is directed by
a sophisticated person as described in Rule 506(b)(2)(ii) of Regulation D.

         (vii) Any  entity  in which all of the  equity  owners  are  Accredited
Investors.

2.    REGISTRATION RIGHTS

      a.    The  Company  agrees to utilize  its best  efforts to  register  the
            Shares   under   the  Act  by   filing  a   Registration   Statement
            ("Registration   Statement")   with  the   Securities  and  Exchange
            Commission ("the  "Commission") on a form deemed  appropriate by the
            Company's  counsel as  expeditiously  as is  reasonably  practicable
            after the date that this  Subscription  Agreement is accepted by the
            Company, but in no event later than 90 days after such date.

      b.    The  Undersigned  will cooperate with the Company in all respects in
            connection  with  the  Registration  Statement,   including,  timely
            supplying all  information  reasonably  requested by the Company and
            executing  and  returning  all  documents  reasonably  requested  in
            connection with the registration and sale of the Shares.

      c.    The  Company  will use its best  efforts  to cause the  Registration
            Statement to become  effective  within 60 days of the filing thereof
            with the  Commission  and to remain  effective  for a period of nine
            months.

      d.    The  Company  will  prepare  and  file  with  the  Commission   such
            amendments and supplements (including post-effective


                                       8
<PAGE>

            amendments) to the Registration Statement and the prospectus used in
            connection  therewith as may be  necessary to keep the  Registration
            Statement  effective  and to comply with the  provisions  of the Act
            with respect to the sale or other  disposition of the Shares covered
            by the Registration Statement for a period of nine months.

      e.    The  Company  shall  furnish  to  the  Undersigned  such  number  of
            conformed  copies  of the  Registration  Statement  and of each such
            amendment  and  supplement  thereto  (in  each  case  including  all
            exhibits),  such number of copies of the prospectus  included in the
            Registration  Statement  (including each preliminary  prospectus and
            any summary prospectus),  in conformity with the requirements of the
            Securities  Act,  such  documents  incorporated  by reference in the
            Registration Statement or prospectus,  and such other documents,  as
            the  Undersigned  may reasonably  request in order to facilitate the
            sale or disposition of the Shares.

      f.    The  Company  shall use its best  efforts to register or qualify the
            Shares  and  any  other  securities   covered  by  the  Registration
            Statement  under  such other  securities  or "blue sky" laws of such
            jurisdictions as the Undersigned  shall reasonably  request,  and do
            any and all other acts and things  that may be  necessary  to enable
            the Undersigned to consummate the disposition in such  jurisdictions
            of the  Shares,  except  that  the  Company  shall  not for any such
            purpose be required to qualify generally to do business as a foreign
            corporation in any jurisdiction  wherein it is not so qualified,  or
            to subject  itself to taxation  in respect of doing  business in any
            such  jurisdiction,  or to consent to general  service of process in
            any such jurisdiction.

      g.    The Company shall  immediately  notify the  Undersigned  at any time
            when a prospectus relating to the Shares is required to be delivered
            under the Securities  Act, of the happening of any event as a result
            of which the prospectus including in the Registration  Statement, as
            then in effect,  includes an untrue  statement of a material fact or
            omits to state any material  fact  required to be stated  therein or
            necessary to make the statements therein not misleading in the light
            of the circumstances then existing or if it is necessary to amend or
            supplement such prospectus to comply with law, and at the request of
            the  Undersigned  shall  prepare  and furnish to the  Undersigned  a
            reasonable  number of copies of a  supplement  to or an amendment of
            such prospectus as may be necessary so that, as thereafter delivered
            to the purchasers of the Shares or other securities, such prospectus
            shall not include an untrue  statement of a material fact or omit to
            state a material fact required to be stated  therein or necessary to
            make the  statements 


                                       9
<PAGE>

            therein  not  misleading  in the  light  of the  circumstances  then
            existing and shall  otherwise  comply in all material  respects with
            law and so that such prospectus,  as amended or  supplemented,  will
            comply with applicable law.

      h.    The Company shall  cooperate with the  Undersigned to facilitate the
            timely  preparation  and delivery of  certificates  (not bearing any
            restrictive  legends)  representing  securities to be sold under the
            Registration  Statement,  and enable such  securities  to be in such
            denominations  and registered in such names as the  Undersigned  may
            request.

      i.    The Company shall notify the  Undersigned  immediately,  and confirm
            the notice in writing (A) when the  Registration  Statement,  or any
            post-effective  amendment thereto,  shall have become effective,  or
            any supplement to the prospectus or any amendment  prospectus  shall
            have  been  filed,  (B) of the  receipt  of any  comments  from  the
            Commission,  (C) of any  request  of the  Commission  to  amend  the
            Registration  Statement or amend or supplement the prospectus or for
            additional information, and (D) of the issuance by the Commission of
            any stop order  suspending  the  effectiveness  of the  Registration
            Statement or of any order  preventing or  suspending  the use of any
            preliminary prospectus, or of the suspension of the qualification of
            the Registration Statement for offering or sale in any jurisdiction,
            or of the  institution or threatening of any  proceedings for any of
            such purposes.

      j.    The  Company  shall make  every  reasonable  effort to  prevent  the
            issuance  of any stop  order  suspending  the  effectiveness  of the
            Registration  Statement or of any other preventing or suspending the
            use of any preliminary  prospectus and, if any such order is issued,
            to obtain the withdrawal of any such order at athe earliest possible
            moment.

      k.    All expenses  incurred in connection  with the  registration  of the
            Shares under this Agreement shall be paid by the Company, including,
            without  limitation,  printing  expenses,  fees and disbursements of
            counsel  for the  Company  and  expenses  of any audits to which the
            Company  shall  agree or which  shall be  necessary  to comply  with
            governmental  requirements in connection with any such registration,
            all  registration  and filing fees for the Shares under  Federal and
            State securities laws;  provided,  however, the Company shall not be
            liable for (a) any discounts or  commissions  to any  underwriter or
            broker/dealer; (b) any stock transfer taxes incurred with respect to
            Shares or (c) the fees and  expenses of counsel  and/or  accountants
            for the Undersigned.


                                       10
<PAGE>

      l.    The Company shall indemnify and hold harmless each Undersigned,  its
            directors  and  officers and if such  Undersigned  is a portfolio or
            investment  fund, its investment  advisors and each person,  if any,
            who  controls the  Undersigned  within the meaning of the Act or the
            Securities  Exchange Act of 1934 (the  "Exchange  Act") (each of the
            Undersigned and each such officer, director,  investment advisor (if
            applicable) and controlling person, an "Indemnified Party"), against
            any losses,  claims,  damages or  liabilities  (joint or several) to
            which they may become  subject  under the Act,  the  Exchange Act or
            other federal or state law, insofar as such losses,  claims, damages
            or liabilities  (or actions in respect  thereof) arise out of or are
            based upon any of the following statements,  omissions or violations
            (collectively  a "Violation"):  (i) any untrue  statement or alleged
            untrue  statement of a material fact contained in such  registration
            statements including any preliminary  prospectus or final prospectus
            contained therein or any amendments or supplements thereto, (ii) the
            omission  or  alleged  omission  to state  therein a  material  fact
            required to be stated  therein,  or necessary to make the statements
            therein,  in light of the circumstances  under which they were made,
            not  misleading,  (iii) any  violation  or alleged  violation by the
            Company of the Act, the Exchange  Act, or (iv) any state  securities
            law or any  rule  or  regulation  promulgated  under  the  Act,  the
            Exchange  Act or any state  securities  law,  and the Company  shall
            reimburse  each  Indemnified  Party for any legal or other  expenses
            incurred by them in connection with  investigating  or defending any
            such loss, claim, damage,  liability or action;  provided,  however,
            that the Company shall not be liable to any  Undersigned in any such
            case for any such loss,  claim,  damage,  liability or action to the
            extent  that it arises  out of or is based  upon a  Violation  which
            occurs in reliance upon and in conformity  with written  information
            furnished  expressly for use in connection with such registration by
            the  Undersigned.  Such  indemnity  shall  remain in full  force and
            effect regardless of any  investigation  made by or on behalf of any
            Indemnified  Party and shall  survive the  transfer of any Shares by
            the Undersigned.

      m.    Promptly  after  receipt  by an  Indemnified  Party of notice of the
            commencement of any action or proceeding (including any governmental
            investigation)  involving a claim referred to in this paragraph (l),
            such Indemnified  Party will, if a claim in respect thereof is to be
            made against the Company,  give written  notice to the latter of the
            commencement of such action; provided,  however, that the failure of
            any  Indemnified  Party to give notice as provided  herein shall not
            relieve the Company of its  obligations  under this  paragraph  (l),
            except to the extent that the company is actually prejudiced by such
            failure to give notice.  In case any such action


                                       11
<PAGE>

            is brought against an Indemnified Party,  unless in such Indemnified
            Party's  reasonable  judgment a conflict  of interest  between  such
            Indemnified Party and the Company may exist in respect of such claim
            (in which  case,  the  Company  shall not be liable for the fees and
            expenses of more than one counsel for all Indemnified Parties),  the
            Company will be entitled to participate in and to assume the defense
            thereof  to the  extent  that it may wish  with  counsel  reasonably
            satisfactory to such  Indemnified  Party,  and after notice from the
            Company to such  Indemnified  Party of its election so to assume the
            defense thereof,  the Company will not be liable to such Indemnified
            Party for an legal or other  expenses  subsequently  incurred by the
            latter in connection with the defense thereof. The Company shall not
            consent to entry of any judgment or enter into any settlement  which
            does not include as an unconditional term thereof, the giving by the
            claimant or  plaintiff to such  Indemnified  Party of a release from
            all liability in respect to such claim or litigation.


                                       12
<PAGE>

3.    JURISDICTIONAL NOTICES

      THE  SECURITIES  OFFERED  PURSUANT TO THE TERM SHEET  HEREBY HAVE NOT BEEN
REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933 OR THE SECURITIES LAWS
OF ANY  STATES OF THE  UNITED  STATES OR ANY  OTHER  JURISDICTION  AND ARE BEING
OFFERED AND SOLD IN RELIANCE UPON EXEMPTIONS FROM THE REGISTRATION  REQUIREMENTS
OF SAID ACT AND SUCH  LAWS.  THE  SECURITIES  ARE  SUBJECT  TO  RESTRICTIONS  ON
TRANSFERABILITY  AND  RESALE  AND MAY NOT BE  TRANSFERRED  OR  RESOLD  EXCEPT AS
PERMITTED  UNDER SAID ACT AND SUCH LAWS  PURSUANT TO  REGISTRATION  OR EXEMPTION
THEREFROM.  INVESTORS  SHOULD BE AWARE  THAT THEY WILL BE  REQUIRED  TO BEAR THE
FINANCIAL  RISKS OF THIS  INVESTMENT  FOR AN  INDEFINITE  PERIOD  OF  TIME.  THE
SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE UNITED STATES SECURITIES
AND EXCHANGE COMMISSION, ANY STATE SECURITIES COMMISSION OR ANY OTHER REGULATORY
AUTHORITY, NOR HAVE ANY OF THE FOREGOING AUTHORITIES PASSED UPON OR ENDORSED THE
MERITS OF THIS  OFFERING OR THE  ACCURACY  OR  ADEQUACY  OF THE TERM SHEET.  ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.  IT IS THE  RESPONSIBILITY
OF ANY  SUBSCRIBER  WISHING TO PURCHASE  THE SHARES TO SATISFY  ITSELF AS TO THE
FULL OBSERVANCE OF THE LAWS OF ANY RELEVANT  TERRITORY OUTSIDE THE UNITED STATES
IN  CONNECTION  WITH  ANY  SUCH  PURCHASE,   INCLUDING  OBTAINING  ANY  REQUIRED
GOVERNMENTAL OR OTHER CONSENTS OR OBSERVING ANY OTHER APPLICABLE FORMALITIES.

4.    COUNTERPARTS

      This agreement may be executed in one or more counterparts,  each of which
when executed  shall be deemed an original and all of which taken together shall
constitute but one and the same document.  Delivery by telecopier of an executed
signature  page hereto  shall be  effective  as delivery of a manually  executed
counterpart hereof.


                                       13
<PAGE>

      IN  WITNESS  WHEREOF,  the  Undersigned  has  executed  this  Subscription
Agreement on this 20th day of July, 1998

    750,000 (Number of Shares Subscribed for) x $3.00 per share = $ 2,250,000

    Value Management & Research, AG
- --------------------------------------------------------------------------------
                     Exact Name in Which Title is to be Held

    S/ Florian Homm
- --------------------------------------------------------------------------------
                                  (Signature)

    Florian Homm
- --------------------------------------------------------------------------------
                               Name (Please Print)

    Managing Partner
- --------------------------------------------------------------------------------
                       Title of Person Executing Agreement

    Flughafen Strasse 21
- --------------------------------------------------------------------------------
                           Address: Number and Street

    Neu-Isenburg            Germany                         63263
- --------------------------------------------------------------------------------
        City                Country                          Code

    None
- --------------------------------------------------------------------------------
                            Tax Identification Number

    Offenbach / Main - Germany
- --------------------------------------------------------------------------------
                          Jurisdiction of Incorporation

    Accepted this 20th day of July, 1998, on behalf of

                                            HEMISPHERX BIOPHARMA, INC.

                                            BY:  S/ William A. Carter


                                       14
<PAGE>

FORM OF RECEIPT

                   SILVERMAN, COLLURA, CHERNIS & BALZANO, P.C.

The undersigned  hereby  acknowledges  receipt from Value  Management & Research
("VMR") of the amount of US  $1,200,000,  representing  the  purchase  price for
400,000 shares (the "Shares") of the common stock of Hemispherx Biopharma,  Inc.
(the "Company") in accordance with the  subscription  agreement dated as of July
___,  1998 (the  "Agreement")  between the Company and VMR. The  undersigned  is
aware that the Agreement (i) permits the Company to reject, in whole or in part,
the  subscription by VMR for the Shares and (ii) in the event of such rejection,
requires  the  Company  of cause  the  return  to VMR of all or the  appropriate
portion of the  purchase  price,  as the case may be. The  undersigned  confirms
that,  upon  instruction  by the Company,  it shall return to VMR forthwith such
purchase price or portion thereof, as the case may be.

                                                SILVERMAN, COLLURA, CHERNIS
                                                      & BALZANO, P.C.

                                                By:_____________________________
                                                    Name:
                                                    Title:


                                       15
<PAGE>

FORM OF RECEIPT

                   SILVERMAN, COLLURA, CHERNIS & BALZANO, P.C.

The undersigned  hereby  acknowledges  receipt from Value  Management & Research
("VMR") of the amount of US  $1,050,000,  representing  the  purchase  price for
350,000 shares (the "Shares") of the common stock of Hemispherx Biopharma,  Inc.
(the "Company") in accordance with the  subscription  agreement dated as of July
___,  1998 (the  "Agreement")  between the Company and VMR. The  undersigned  is
aware that the Agreement (i) permits the Company to reject, in whole or in part,
the  subscription by VMR for the Shares and (ii) in the event of such rejection,
requires  the  Company  of cause  the  return  to VMR of all or the  appropriate
portion of the  purchase  price,  as the case may be. The  undersigned  confirms
that,  upon  instruction  by the Company,  it shall return to VMR forthwith such
purchase price or portion thereof, as the case may be.

                                                SILVERMAN, COLLURA, CHERNIS
                                                      & BALZANO, P.C.

                                                By:_____________________________
                                                    Name:
                                                    Title:


                                       16



                                  EXHIBIT 23.1

                           (INCLUDED IN EXHIBIT 5.1)



                                                                    Exhibit 23.2

                       Consent of Independent Accountants

The Board of Directors
Hemispherx Biopharma, Inc.:

We consent to the use of our reports incorporated herein by reference and to the
reference to our firm under the heading "Experts" in the prospectus.

                                                 KPMG Peat Marwick LLP

Philadelphia, Pennsylvania
December 7, 1998



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