BOSTON LIFE SCIENCES INC /DE
S-3/A, 1996-05-10
PHARMACEUTICAL PREPARATIONS
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<PAGE>
 
    
221515.002 (B&F)     
    
     As filed with the Securities and Exchange Commission on April __, 1996     
    
                                                           Registration No.     
    
333-2730     
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, DC  20549
         
                                  ----------
                                    
                                AMENDMENT No. 1     
                                       To
                                    Form S-3
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
         
                                   ----------
                           BOSTON LIFE SCIENCES, INC.
               (Exact name of registrant as specified in charter)

            Delaware                                   87-0277826
   (State or other jurisdiction of                  (I.R.S. Employer
    incorporation or organization)                Identification Number)

                               1601 Trapelo Road
                          Waltham, Massachusetts 02154
                                 (617) 890-8263
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)

                                S. David Hillson
                     President and Chief Executive Officer
                           Boston Life Sciences, Inc.
                               1601 Trapelo Road
                          Waltham, Massachusetts 02154
                                 (617) 890-8263
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
        
                                   ----------
                                   Copies to:
                             Raymond D. Agran, Esq.
                            Gerald J. Guarcini, Esq.
                       Ballard Spahr Andrews & Ingersoll
                         1735 Market Street, 51st Floor
                            Philadelphia, PA  19103
                                 (215) 665-8500

   Approximate date of commencement of proposed sale to the public:  As soon as
    practicable after this Registration Statement is declared effective.
   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, other than securities offered only in connection with dividend or
    interest reinvestment plans, check the following box. [X]
        
                                   ----------

       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 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.
======================================
<PAGE>
 
                        
                   SUBJECT TO COMPLETION, DATED MAY __, 1996     


     PROSPECTUS


                               48,072,758 Shares

                           Boston Life Sciences, Inc.

                           Common Stock and Warrants

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


     The securities offered hereby consist of (i) 48,072,758 shares of common
     stock, $.01 par value per share (the "Common Stock"), and (ii) 5,997,782
     warrants (the "Warrants"), each of which entitles the holder thereof to
     purchase one share of Common Stock of Boston Life Sciences, Inc., a
     Delaware corporation ("BLSI" or the "Company"), which are owned by the
     selling stockholders listed herein under "Selling Stockholders"
     (collectively, the "Selling Stockholders") (the Common Stock and Warrants
     offered hereby are collectively referred to as the "Shares").  The Shares
     may be offered from time to time by the Selling Stockholders.  All expenses
     of registration incurred in connection herewith are being borne by the
     Company, but all selling and other expenses incurred by a Selling
     Stockholder will be borne by that Selling Stockholder.  The Company will
     not receive any of the proceeds from the sale of the Shares by the Selling
     Stockholders.

     The Selling Stockholders have not advised the Company of any specific plans
     for the distribution of the Shares covered by this Prospectus, but it is
     anticipated that the Shares will be sold from time to time primarily in
     transactions (which may include block transactions) on the Nasdaq SmallCap
     Market of The Nasdaq Stock Market, Inc. (the "Nasdaq SmallCap Market") at
     the market price then prevailing, although sales may also be made in
     negotiated transactions or otherwise.  The Selling Stockholders and the
     brokers and dealers through whom sale of the Shares may be made may be
     deemed to be "underwriters" within the meaning of the Securities Act of
     1933, as amended (the "Securities Act"), and their commissions or discounts
     and other compensation may be regarded as underwriters' compensation.  See
     "Plan of Distribution."
         
     The Company's Common Stock is traded on the Nasdaq SmallCap Market under
     the symbol "BLSI."  On May __, 1996, the last reported closing price of the
     Common Stock was $__________ per share.     

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


     An investment in the Common Stock and Warrants offered hereby involves a
     high degree of risk.  See "Risk Factors" beginning on page 5 of this
     Prospectus.

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

    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 May __, 1996.     
<PAGE>
 
     No dealer, salesman or other person has been authorized to give any
     information or to make any representation not contained in or incorporated
     by reference in this Prospectus and, if given or made, such information or
     representation must not be relied upon as having been authorized by the
     Company, the Selling Shareholders or any other person.  This Prospectus
     does not constitute an offer to sell or a solicitation of an offer to buy
     any of the securities offered hereby in any jurisdiction to any person to
     whom it is unlawful to make such an offer in such jurisdiction.  Neither
     the delivery of this Prospectus nor any sale made hereunder shall, under
     any circumstances, create any implication that the information herein is
     correct as of any time subsequent to the date hereof or that there has been
     no change in the affairs of the Company since that date.


                             AVAILABLE INFORMATION

     This Prospectus, which constitutes a part of a Registration Statement on
     Form S-3 (the "Registration Statement") filed by the Company with the
     Securities and Exchange Commission (the "Commission") under the Securities
     Act, omits certain of the information set forth in the Registration
     Statement.  Reference is hereby made to the Registration Statement and to
     the exhibits thereto for further information with respect to the Company
     and the securities offered hereby.  Copies of the Registration Statement
     and the exhibits thereto are on file at the offices of the Commission and
     may be obtained upon payment of the prescribed fee or may be examined
     without charge at the public reference facilities of the Commission
     described below.

     Statements contained herein concerning the provisions of documents are
     necessarily summaries of such documents, and each statement is qualified in
     its entirety by reference to the copy of the applicable document filed with
     the Commission.

     The Company is subject to the informational requirements of the Securities
     Exchange Act of 1934, as amended (the "Exchange Act"), and, accordingly,
     files reports, proxy statements and other information with the Commission.
     Such reports, proxy statements and other information can be inspected and
     copied at the public reference facilities maintained by the commission at
     Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549,
     and at the Commission's Regional Offices located at Seven World Trade
     Center, New York, New York 10048 and Northwestern Atrium Center, 500 West
     Madison Street, Suite 1400, Chicago, Illinois 60661.  Copies of such
     documents may also be obtained from the Public Reference Section of the
     Commission at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C.
     20549, at prescribed rates.  In addition, reports and proxy statements
     concerning the Company can be inspected at the offices of the National
     Association of Securities Dealers, Inc., 1735 K Street, N.W., Washington,
     D.C. 20006.


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents or portions of documents filed by the Company (File
     No. 0-6533) with the Commission are incorporated hereby by reference:
             
         (a) Annual Report on Form 10-K for the fiscal year ended December 
             31, 1995.     
             
         (b) Annual Report on Form 10-K, as amended by Form 10-K/A, for the 
             fiscal year ended December 3, 1994.     
             
         (c) Current Report on Form 8-K filed February 23, 1996.     
             
         (d) Current Report on Form 8-K filed March 7, 1996.     
             
         (e) The description of the Company's Common Stock which is
     contained in the Company's Registration Statement on Form 8-A filed under
     the Exchange Act, including any amendment or reports filed for the purpose
     of updating such description.     

     All reports and other documents subsequently filed by the Company pursuant
     to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the
     filing of a post-effective amendment which indicates that all securities
     offered hereby have been sold or which deregisters all securities remaining
     unsold, shall be deemed to be incorporated by reference in this Prospectus
     and to be a part hereof from the date of the filing of such reports or
     documents.  Any statement 

                                       2
<PAGE>
 
     contained in a document, all or a portion of which is incorporated by
     reference herein, shall be deemed to be modified or superseded for purposes
     of this Prospectus to the extent that a statement contained or incorporated
     by reference herein modifies or supersedes such statement. Any statement so
     modified or superseded shall not be deemed, except as so modified or
     superseded, to constitute a part of this Prospectus.
         
     Upon request, the Company will provide without charge to each person to
     whom this Prospectus is delivered a copy of any or all of such documents
     which are incorporated herein by reference (other than exhibits to such
     documents unless such exhibits are specifically incorporated by reference
     into the documents that this Prospectus incorporates).  Written or oral
     requests for copies should be directed to Marc E. Lanser, M.D., Executive
     Vice President and Chief Scientific Officer, 1601 Trapelo Road, Waltham,
     Massachusetts 02154, telephone number (617) 890-8263.     

                                       3
<PAGE>
 
                                  THE COMPANY


     Boston Life Sciences, Inc. ("BLSI" or the "Company") is the result of a
     merger (the "Merger") between BLSI and Greenwich Pharmaceuticals, Inc.
     ("Greenwich").  The Merger took place on June 15, 1995 and resulted in a
     publicly traded company managed by the Board of Directors and management of
     Boston Life Sciences, Inc. ("Old BLSI"), the company existing prior to the
     merger.

     BLSI is a development stage biotechnology company engaged in the research
     and development of novel therapeutic and diagnostic products to treat
     chronic debilitating diseases, such as cancer, Parkinson's Disease, central
     nervous system (CNS) disorders and autoimmune diseases.  With the exception
     of the technologies originating with Greenwich, all of BLSI's technologies
     currently under development were invented or discovered by researchers
     working at Harvard University and/or its affiliated hospitals ("Harvard and
     its Affiliates").  In addition, as a result of the merger, BLSI in the case
     of THERAFECTIN(R) amiprilose HC1 ("THERAFECTIN"), expects to commence a
     Phase III trial in the second quarter of 1996.

     Corporate Strategy

     The Company intends to (i) fund the early development of its compounds in
     preclinical development and (ii) enter into corporate partnering
     arrangements with established pharmaceutical or biotechnology companies to
     support the continued development of BLSI's compounds and potential
     marketing of any products following government approvals.  Additionally,
     BLSI does not currently own any laboratory or manufacturing facilities and
     intends to contract out such services.

     With the addition of Greenwich's carbohydrate technologies acquired in the
     Merger, BLSI will also be formulating a strategy to address the potential
     future requirements of THERAFECTIN with the ultimate objective of obtaining
     U.S. Food and Drug Administration (FDA) approval.  See "Recent
     Developments."  There can be no assurances, however, that the
     implementation of any strategy would ultimately result in the approval of
     THERAFECTIN by FDA.

     Strategic Alliances

     In June 1995, BLSI entered into a research and development collaboration
     agreement with Zeneca Pharmaceuticals, Ltd. ("Zeneca") for all indications,
     on a worldwide basis, of BLSI's MHC Class II Inhibition technology.  The
     collaboration calls for Zeneca to fund approximately the first two years of
     research and for BLSI to receive payments from Zeneca as lead compounds
     reach traditional clinical development milestones.  In addition, BLSI will
     receive royalties payable on the sale of any products originating from the
     collaboration.

     BLSI is also a party to two collaborations for THERAFECTIN with different
     pharmaceutical companies for various geographic regions in the world.
     Those development and license agreements are with (i) Kissei Pharmaceutical
     Co., Ltd. ("Kissei") for all indications of amiprilose HCl in the Far East
     and Russia and (ii) Irotec Laboratories of Cork, Ireland ("Irotec") to
     market amiprilose HCl in the territories of the Republic of Ireland and the
     Netherlands.  Unless BLSI obtains marketing approval for THERAFECTIN in the
     United States and Kissei and Irotec obtain marketing approval of amiprilose
     HCl in their respective regions, the future milestone payments from Kissei
     and Irotec will not be received.

     Products Under Development And Research Programs

            Compounds Approved for Clinical Development

     THERAFECTIN.  The Company currently expects to commence a Phase III
     clinical trial for THERAFECTIN in the second quarter of 1996.  THERAFECTIN
     previously formed the foundation of Greenwich's drug development efforts.
     Early work on THERAFECTIN revealed potent pharmacologic effects, e.g.
     enhancement of killing and clearance of intracellular pathogens (including
     bacteria, fungi, viruses, parasites) and anti-tumor activity.  Further work
     supported the immunostimulatory effects of THERAFECTIN.  As the significant
     anti-inflammatory effects of other known 

                                       4
<PAGE>
 
     immunostimulants (levamisole and muramyl dipeptide) were well documented,
     investigations of the potential anti-inflammatory activity of THERAFECTIN
     were initiated.

     Since the Merger, the Company has actively been engaged in a review of the
     THERAFECTIN preclinical and clinical data, including the IND and NDA
     filings made with FDA, correspondence between Greenwich and FDA, and the
     transcripts of the Arthritis Advisory Committee meetings.  The Company has
     sought input from outside independent regulatory affairs consultants and
     reviewed the preclinical and clinical data with certain of Greenwich's
     scientific and regulatory affairs personnel.  Based on its analysis, the
     Company concluded that there was sufficient evidence of therapeutic
     efficacy and that further investigation of the clinical development of
     THERAFECTIN was warranted.  To this end, the Company has assembled a panel
     comprised of expert academic clinical rheumatologists and enlisted the aid
     of medical, regulatory, and statistical consultants to assist BLSI in
     formulating a clinical strategy for THERAFECTIN.  The Company held a
     consensus meeting with the entire panel and its consultants to discuss such
     strategy (including potential protocols for any possible additional
     clinical study) for THERAFECTIN.  In November, the Company submitted to FDA
     a draft protocol for a proposed Phase III study of THERAFECTIN.  The draft
     protocol is for a double-blind, placebo-controlled, multi-center study
     similar to a successful Phase III study (RA-9) previously performed by
     Greenwich.   The Company has met with FDA to discuss the protocol and
     currently intends to commence the study in the second quarter of 1996.

     ALTROPANE (Parkinson's Disease-Diagnostic Agent).  BLSI is developing a
     nuclear medicine imaging agent, Altropane, that it believes will be useful
     in the early diagnosis of Parkinson's Disease at its early stages, prior to
     the onset of specific symptoms.  Since administration of currently
     available therapies in the early stages of Parkinson's Disease may delay
     the progression of the disease, early definitive diagnosis may be of
     substantial benefit.  ALTROPANE is currently undergoing Phase I/II clinical
     testing under a physician-sponsored IND.

            Preclinical Development Programs

     CDI (Cartilage-Derived Inhibitor).  BLSI is developing a factor derived
     from cartilage called CDI, which inhibits new blood vessel formation.
     Angiogenesis (new blood vessel formation) plays a role in the growth and
     spread of solid tumors throughout the body because cancerous tumors require
     new blood vessels in order to grow and metastasize.  The Company's
     collaborating scientists have isolated and cloned CDI, and the Company
     currently anticipates commencing large-scale animal testing in the second
     quarter of 1996.  BLSI plans to develop CDI for the treatment of solid
     tumors and other diseases of neovascularization, including rheumatoid
     arthritis and numerous eye diseases.

     Autoimmune Diseases  (Inhibition of the Expression of MHC Molecules).
     Autoimmune diseases are characterized by the production of antibodies
     directed against the body's own tissues, and the consequent destruction of
     those tissues by the body's immune cells.  Central to the pathogenesis of
     these diseases is the expression of MHC (Major Histocompatibility Complex)
     class II DR molecules on the surface of antigen-presenting cells that are
     found within the tissues that are attacked in autoimmune disease.  The
     Company is developing a means to specifically inhibit MHC DR expression.
     Inhibition of DR expression might provide a specific treatment for
     autoimmune diseases, because of its specificity, this treatment might be
     relatively free of side effects.  In June 1995, BLSI entered into a
     research and development collaboration agreement with Zeneca for all
     indications, on a worldwide basis, of BLSI's MHC Class II Inhibition
     technology.  See "Summary of Offering Memorandum -- Strategic Alliances."

     Cancer  (Tumor Targeting).  Monoclonal antibodies (MAbs) have high
     specificity and high affinity and/or avidity for their antigens.  Because
     of this, MAbs have been considered particularly attractive as selective
     carriers of diagnostic and therapeutic products.  Recently, problems such
     as low per cent maximum injected dose per gram of target tissue and slow
     clearance and nonuniform distribution within tumors have led many to
     question the future of MAbs in radioimmunodiagnosis and radioimmunotherapy.
     There is thus a need for new methods for directing therapeutic molecules to
     tumors that do not rely upon strict structural integrity of all MAb
     molecules used, and could insure delivery of sufficient doses of
     radiotherapy to tumors without harming normal tissues.  The Company is
     presently developing such a system to target radiotherapy to solid tumors.
     This system is comprised of sequential specific binding pairs of reagents
     that are injected in such a manner that the binding between functional
     groups is specific and the results are maximally amplified.

                                       5
<PAGE>
 
     Central Nervous System  (Axogenesis Factor 1).  Axogenesis Factor 1 (AF-1)
     is a recently discovered nerve growth factor that has the unique
     characteristic of being the only factor identified so far that promotes
     axon outgrowth from central nervous system (CNS) cells (i.e. CNS
     regeneration).  This property is significant, since the zone of partial
     injury surrounding the central necrotic zone of a stroke contains live but
     damaged nerve cells that have lost their axons.  AF-1 would therefore
     potentially salvage these partially injured cells, resulting in some
     recovery of function.  The same phenomena occurs in brain injury and in
     spinal cord trauma.  The Company hopes that AF-1 could provide the first
     truly "regenerative" treatment for these conditions.  Since the discovery
     of AF-1 one year ago, AF-1 has been purified and amino acid composition has
     been obtained.  AF-1 is a peptide having 5 amino acids, which could make it
     relatively simple to manufacture.  Following amino acid sequencing of AF-1,
     the Company believes that quantities sufficient for in vitro and in vivo
     testing could be made without difficulty and at a reasonable price.  This
     material will then be tested in an animal model of spinal cord injury and
     stroke.  If the animal models are successful, then reformulation to
     maximize crossing of the blood-brain barrier would have to be done prior to
     filing of an IND.  The Company believes that an IND could be filed within
     three years although there can be no assurance to that effect.

            Parkinson's Disease Therapy

     The Company's interest in developing novel therapeutic agents for
     Parkinson's Disease continues.  However, based on recent insights into the
     structure-function relationship of the D1 receptor-dopamine interaction,
     the Company's emphasis has shifted toward the development of new molecules
     that have been designed to mimic dopamine's action on the D1 receptor.  The
     Company has entertained inquiries from potential corporate partners, and
     intends to pursue this R&D effort if a corporate partnership is secured.
     There can be no assurances that a corporate partner will be secured or, if
     secured, that the partnership will be successful.


     CAPITAL INVESTMENT SINCE JANUARY 1, 1996

     Pursuant to Regulation D of the Act, in January and February 1996, the
     Company sold pursuant to certain subscription agreements approximately 240
     units (each, a "Unit") for net proceeds to the Company of approximately
     $20.8 million.  Each Unit consists of (i) 1,000 shares of Series A
     Convertible Preferred Stock, stated value $100 per share (the "Preferred
     Stock"), and (ii) warrants to purchase 25,000 shares of Common Stock at
     $.6708 per share at any time over a ten-year period.  The Preferred Stock
     is initially convertible at any time at the option of the holder into
     shares of the Company's Common Stock pursuant to a ratio of 175.3771 shares
     of Common Stock for each share of Preferred Stock.  This initial conversion
     ratio is subject to adjustment in February 1997 (the "Adjustment Date") if
     the fair market value on the Adjustment Date of the Company's Common Stock
     issuable upon conversion of one share of the Preferred Stock is less than
     $130.00.

     The proceeds from the Regulation S and Regulation D offers described above
     are expected to be sufficient to fund the Company's current development
     programs at their present levels of expenditure through 1997.


     NAME CHANGE

     The Company was incorporated in Delaware in 1972 under the name Greenwich
     Pharmaceuticals Incorporated ("Greenwich") and, effective June 15, 1995
     changed its name to Boston Life Sciences, Inc.  Effective June 15, 1995,
     Old BLSI merged with and into Greenwich.  The Company's principal executive
     offices are now located at Reservoir Place, 1601 Trapelo Road, Waltham,
     Massachusetts, and its telephone number at that location is (617) 890-8263.

                                       6
<PAGE>
 
                                  RISK FACTORS

     In addition to the other information appearing elsewhere or incorporated by
     reference in this Prospectus, prospective investors should consider the
     following factors in evaluating the Company and its business before
     purchasing any of the Shares offered hereby.

     DEVELOPMENT STAGE

     Each of BLSI and Greenwich prior to the Merger had net operating losses
     since their respective inceptions.  Further, the Company has not generated
     revenues to date from product sales.  Presently, the Company is expected to
     incur substantial additional operating losses for the foreseeable future.
     The Company's ability to achieve profitability will depend, among other
     things, on a combination of one or more of the following factors:  the
     Company's ability to obtain significant additional financing; the Company's
     ability to obtain regulatory approvals for, and successfully complete the
     development and commercialization of, its product candidates, preclinical
     compounds and technologies; the time and cost of obtaining regulatory
     approvals for its products; the Company's ability to protect its
     proprietary rights, including its patent claims and the patent claims of
     its licensors and collaborators; the Company's licensors' and
     collaborators' ability to protect their patent claims; the Company's
     ability to enter into agreements for product development and
     commercialization; competing technological and market developments;
     manufacturing costs associated with its products and product candidates;
     and the costs of commercializing its products.  There can be no assurance
     that the Company will obtain required regulatory approvals, or successfully
     develop, manufacture and market its products or that the Company will
     achieve profitability.

     STATUS OF LITIGATION

     The Company was served with five complaints during 1992, which complaints
     were subsequently consolidated and granted class action status, alleging
     violations of the Federal securities laws and common law.  On April 12,
     1995, the Court entered a Final Judgment and Order of Dismissal pursuant to
     Rule 23(e) of the Federal Rules of Civil Procedure approving the Class
     Action Settlement and on April 25, 1995 the Court of Chancery of the State
     of Delaware for New Castle County entered an Order and Final Judgment
     pursuant to Rule 23.1 of the Rules of the Court of Chancery approving the
     Derivative Action Settlement. During the 30-day period following such court
     orders, appeals of the settlements are permitted.  No appeals were accepted
     and the orders approving the Class Action Settlement and the Derivative
     Action Settlement are final.

     EARLY STAGE OF BLSI'S PRODUCTS; NO MARKETING EXPERIENCE

     None of the Company's product candidates, preclinical compounds and
     technologies have been approved for marketing by FDA or FDA's international
     equivalent.  The evaluation, research and development of any of the
     Company's product candidates, preclinical compounds or technologies
     requires further extensive laboratory and clinical testing prior to
     regulatory approval.  There can be no assurance that any of the Company's
     product development efforts will be successfully completed, that any
     required regulatory approvals will be obtained, that any such product
     candidates will be capable of being manufactured in commercial quantities
     at reasonable cost or that any new products, if introduced, will achieve
     market acceptance.  Also, there can be no assurance that the Company will
     not cease (i) all efforts to obtain approval of its technologies or (ii)
     the research and development of any of its current compounds in preclinical
     development.

     In addition, BLSI has had no experience in marketing pharmaceutical
     products.  In order to achieve commercial success for any product
     candidates, the Company will be required to either enter into arrangements
     with third parties with respect to the marketing of the Company's products
     or develop such marketing experience internally.  There can be no assurance
     that the Company will be able to enter into marketing agreements with
     others on acceptable terms, if at all, or that it will successfully develop
     such experience.

     DEPENDENCE UPON HARVARD AND ITS AFFILIATES

     BLSI currently conducts a substantial portion of its research and
     development through Harvard and its Affiliates pursuant to sponsored
     research agreements.  Virtually all of BLSI's current technologies under
     development were 

                                       7
<PAGE>
 
     invented or discovered by researchers working for Harvard and its
     Affiliates (the "BLSI Technologies"). A substantial portion of the
     Company's business is thus dependent upon (i) the continuing research and
     development performed by Harvard and its Affiliates pursuant to sponsored
     research agreements with BLSI relating to BLSI's technologies, and (ii) the
     licenses granted to BLSI with respect to the BLSI Technologies by, or the
     licenses that it is seeking to acquire from, Harvard Medical School,
     Harvard School of Public Health and The Children's Medical Center
     Corporation. As a result of such dependence, the success of the Company
     depends, in large part, upon its maintaining its sponsored research
     agreements with Harvard and its Affiliates. There can be no assurances that
     the Company will be successful in this regard or that Harvard and its
     Affiliates will continue to provide access to their resources.

     There can be no assurance that any research performed by Harvard and its
     Affiliates and sponsored by the Company will ever result in any proprietary
     technology which is patentable by Harvard and its Affiliates or that any
     issued patents will provide the Company with any competitive advantages or
     will not be successfully challenged by any third parties.  Moreover, the
     Company will not own licenses to all of the Company's technologies.  There
     can be no assurance that the Company will be able to obtain any required
     licenses or that any patent applications which are the subject of such
     licenses will result in the issuance of any patents.

     RELIANCE UPON FUTURE COLLABORATIONS; CERTAIN PRIOR RELATIONSHIPS

     The Company expects its strategy for the development, clinical testing,
     manufacturing and commercializing of its product candidates, preclinical
     compounds and technologies will include entering into various
     collaborations with corporate partners, joint venturers, licensors, sub-
     licensees and others.  There can be no assurance that the Company will be
     able to negotiate any such collaborative arrangements on acceptable terms,
     if at all, that such arrangements will be successful or that the Company
     will realize any revenues pursuant to such arrangements.  Even if the
     Company is able to negotiate collaborative arrangements on acceptable
     terms, there can be no assurance that such collaborations will be
     completed, will be successful or that disputes will not arise with respect
     to the ownership rights to any technology which may be developed pursuant
     to such collaborations.

     In the event that the Company enters into collaborative arrangements, the
     amount and timing of resources which the other parties to such
     collaborations devote to these activities will not necessarily be within
     the control of the Company.  There can be no assurance that such parties
     will perform their obligations as expected.   If any of the Company's
     collaborators breaches or terminates its agreement with the Company or
     otherwise fails to conduct its collaborative activities in a timely manner,
     the development or commercialization of the product candidate or technology
     subject to such collaboration agreement may be delayed, and the Company may
     be required to undertake unforeseen additional responsibilities or to
     devote unforeseen additional resources to such development or
     commercialization, or such development or commercialization could be
     terminated.  The termination or cancellation of collaborative arrangements
     could also adversely affect the Company's financial condition, intellectual
     property position and operations.

     In addition, the Company expects to rely on third parties to manufacture
     its product candidates.  There can be no assurance that the Company will be
     able to contract with manufacturers that meet the Company's requirements
     for quality, quantity and timeliness, or that the Company would be able to
     find substitute manufacturers, if necessary.  Such inability to contract
     for manufacturing capabilities on acceptable terms may adversely affect the
     Company's ability to conduct preclinical and clinical testing and may
     result in delays in obtaining regulatory approvals, which also may
     adversely affect the Company.  In addition, the manufacture by the Company
     of its products on a commercial scale will require significant start-up
     expenses and expansion of facilities and personnel, and no assurance can be
     given that the Company can develop such manufacturing capability or hire
     and train qualified personnel.

     To the extent that the Company is not able to establish collaborative
     arrangements, it will face increased capital requirements to undertake
     research and development activities at its own expense and may encounter
     significant delays in introducing its products into certain markets or find
     that the development, manufacture or sale of its products in such markets
     is adversely affected by the absence of such collaborative arrangements.

                                       8
<PAGE>
 
     UNCERTAINTY REGARDING PATENTS AND PROPRIETARY RIGHTS

     Even though patent protection will be sought for proprietary technologies
     either by the Company, its collaborators or the inventors or owners of such
     technologies which are subject to licenses granted to the Company, the
     patent application and issuance process can be expected to take several
     years and may entail considerable expense without any assurance that any
     patent will issue.  The Company's ability to obtain protection for any of
     its product candidates, preclinical compounds and technologies could be
     delayed or adversely affected if the United States Patent and Trademark
     Office (the "USPTO") requires clinical data demonstrating efficacy of
     potential therapeutic agents.  The failure to obtain patent protection on
     the Company's product candidates, preclinical compounds and unpatented
     technologies may have a material adverse effect on the Company's
     competitive position and business prospects.  Further, even if patents can
     be obtained, there can be no assurance that any such patents will provide
     the Company with any competitive advantage, that others will not
     independently develop similar technologies or products or duplicate any
     technology developed by or on behalf of the Company or, if patents are
     issued, design around the patented aspects of any technology or products
     developed by or on behalf of the Company, or that any such patent will not
     be successfully challenged by a third party.  It is also possible that
     patented technologies or products of the Company or its licensors or
     collaborators may infringe on patents or other rights owned by others,
     licenses to which may not be available to the Company.  The Company may
     have to alter its products or processes, pay licensing fees or cease
     certain activities altogether because of patent rights of third parties,
     thereby causing additional unexpected costs and delays to the Company.

     Patent law relating to the scope of claims in the fields of healthcare and
     biosciences is still evolving, and the Company's patent rights will be
     subject to this uncertainty.  The Company's patent rights on its products
     therefore might conflict with the patent rights of others, whether existing
     now or in the future.  For the same reasons, the products of others could
     infringe the patent rights of the Company.  The defense and prosecution of
     patent claims is both costly and time-consuming, even if the outcome is
     favorable to the Company.  The failure of any existing or future patents
     owned by or licensed to the Company or its collaborators to provide the
     Company protection against competitors, including without limitation
     protection against a claim of patent infringement, could subject the
     Company to significant liabilities to third parties, require disputed
     rights to be licensed from third parties, require the Company to alter its
     products or processes or require the Company to cease selling its products.

     The Company relies on trade secrets and proprietary know-how, which it
     seeks, and will continue to seek, to protect in part by confidentiality
     agreements with their collaborators, employees and consultants.  There can
     be no assurance that these agreements will not be breached, that the
     Company will have adequate remedies for any such breach or that the
     Company's trade secrets will not otherwise become known or be independently
     developed by competitors.

     To the extent that consultants, key employees or other third parties apply
     technological information independently developed by them or by others to
     the Company's product candidates, preclinical compounds or technologies,
     disputes may arise as to the proprietary rights to such information which
     may not be resolved in favor of the Company.  The Company's scientific
     advisors and other consultants are each employed by, and may have
     consulting agreements with, third parties and any inventions discovered by
     such individuals are not likely to become property of the Company.

     POTENTIAL NEED FOR ADDITIONAL KEY PERSONNEL

     Should the Company determine to undertake the research and development of
     any of the product candidates or preclinical compounds, such research and
     development and the resultant preclinical and clinical testing of its
     various product candidates and preclinical compounds, the governmental
     approval process and the marketing of its product candidates may require
     the addition of key management and scientific personnel, in addition to
     those presently employed by the Company, in areas such as research and
     development, preclinical testing, clinical investigation, regulatory
     affairs, manufacturing and, to the extent applicable, marketing and product
     sales.  The failure of the Company to attract, or to gain access to, such
     personnel could have a material adverse effect on the Company's ability to
     develop such product candidates, preclinical compounds and technologies.
     The Company will face intense competition for such personnel from other
     companies, research and academic institutions, government entities and
     other organizations.  There can be no assurance that the Company will be
     successful in hiring, retaining or otherwise gaining access to the
     personnel required for such activities.

                                       9
<PAGE>
 
     POTENTIAL DIFFICULTY IN OBTAINING FDA AND OTHER GOVERNMENTAL APPROVALS

     The Company's products and its manufacturing and research activities will
     be subject to varying degrees of regulation by a number of government
     authorities in the United States and other countries, including FDA
     pursuant to the Federal Food, Drug and Cosmetic Act.  FDA regulates
     pharmaceutical products, including their manufacture and labeling.  Prior
     to marketing, any product developed by the Company must undergo an
     extensive regulatory approval process, which includes preclinical and
     clinical testing of such product to demonstrate its safety and efficacy.
     This regulatory process can require many years and the expenditure of
     substantial resources.  Data obtained from preclinical and clinical trials
     are subject to varying interpretations, which can delay, limit or prevent
     FDA approval.  See "Development Stage."

     None of the Company's product candidates, preclinical compounds and
     technologies have been approved for marketing by FDA or FDA's international
     equivalent.  The Company cannot accurately predict all relevant regulatory
     requirements or issues.  Changes in existing laws, regulations, policies or
     interpretations of prior events could prevent the Company or its licensees,
     licensors or collaborators from, or could affect the timing of, achieving
     compliance with regulatory requirements, including obtaining current and
     future regulatory clearances, where necessary.  Federal and state laws,
     regulations and policies are always subject to change, with possible
     retroactive effect, and depend heavily on administrative policies and
     interpretations.  There can be no assurance that any changes with respect
     to Federal and state laws, regulations and policies, and, particularly,
     with respect to FDA and other such regulatory bodies, will not have a
     material adverse effect on the Company.

     The process of obtaining FDA clearances can be time-consuming and
     expensive, and there is no assurance that such clearances will be granted
     or that the FDA review process will not involve delays that materially and
     adversely affect the testing, marketing and sale of the Company's products.
     Similar delays may be encountered in foreign countries.  Moreover,
     regulatory clearances for new products, even if granted, may include
     significant limitations on the uses for which such products may be
     marketed.  In addition, even if regulatory approval is obtained, any
     marketed product and its manufacturer are subject to continual review and
     any discovery of previously unrecognized problems with a product or
     manufacturer could result in suspension or limitation of approvals.  There
     can be no assurance that any clearances that are required, once obtained,
     will not be withdrawn or that compliance with other regulatory requirements
     can be maintained, to the degree that the Company may have already
     complied.

     LIMITED PUBLIC MARKET FOR COMMON STOCK; POSSIBLE VOLATILITY OF PRICES, NO
     DIVIDENDS

     Historically, the Common Stock has experienced low trading volumes.  The
     market price of the Common Stock also has been highly volatile and it may
     continue to be highly volatile as has been the case with the securities of
     other public biotechnology companies.  Factors such as announcements by the
     Company or its competitors concerning technological innovations, results of
     clinical trials, new commercial products or procedures, proposed government
     regulations and developments of disputes relating to patents or proprietary
     rights may have a significant effect on the market price of the Company
     securities.  The securities markets have experienced volatility that
     particularly effects prices of equity securities of biotechnology companies
     and which often is unrelated to the performance of such companies.  Thus,
     changes in the market price of the Common Stock may bear no relation to the
     Company's actual operations or financial results.  The Company does not
     expect to pay any dividends on its capital stock for the foreseeable
     future.

     BROKER-DEALER SALES OF COMPANY SECURITIES

     The Common Stock currently is, and in the future may continue to be,
     subject to a Commission rule that imposes additional sales practice
     requirements on broker-dealers who sell certain securities to persons other
     than established customers and accredited investors (generally institutions
     with assets in excess of $5,000,000 or individual with net worth in excess
     of $1,000,000 or annual income exceeding $200,000, or $300,000 jointly with
     his or her spouse).  For transactions covered by the rule, the broker-
     dealer must make a special suitability determination for the purchaser and
     receive the purchaser's written agreement to the transaction before the
     sale.  Consequently, the rule may affect the ability of broker-dealers to
     sell the Common Stock issuable upon conversion of the Preferred Stock and
     also may affect the ability of purchasers in the Offering to sell the
     Preferred Stock in the secondary market.

                                       10
<PAGE>
 
     OUTSTANDING OPTIONS AND WARRANTS

     As of December 31, 1995, the Company had granted stock options and warrants
     to purchase approximately 25.8 million shares of its Common Stock at
     exercise prices ranging from $.01 - $8.91 per share.  Many of these
     previously granted options and warrants were issued at exercise prices
     substantially below the conversion price of the Preferred Stock.  To the
     extent that such previously issued outstanding stock options and warrants
     are exercised, dilution to the percentage interest of the Company's
     stockholders will occur.  Moreover, the terms upon which the Company would
     be able to obtain additional equity capital may be affected adversely since
     the holders of such outstanding options and warrants can be expected to
     exercise them at a time when the Company would, in all likelihood, be able
     to obtain any needed capital on terms more favorable to the Company than
     those provided in the outstanding options and warrants.

     TECHNOLOGICAL CHANGE AND COMPETITION

     The Company operates in rapidly evolving fields.  Competition from larger,
     more experienced and better capitalized companies will be intense.  There
     can be no assurance that developments by others will not render the
     Company's product candidates, preclinical compounds or technologies
     obsolete or noncompetitive or that the Company will be able to keep pace
     with any new technological developments.  In addition, if the Company
     commences sales of products, manufacturing efficiency and marketing
     capabilities are likely to be significant competitive factors.  The Company
     has no sales force or marketing experience.  In addition, many of the
     Company's competitors and potential competitors have substantially greater
     capital resources, manufacturing experience, research and development
     staffs and production facilities than the Company.  Many of these
     competitors also may have significantly greater experience than the Company
     in undertaking preclinical and clinical testing of new pharmaceutical
     products and obtaining FDA and other regulatory approvals of products for
     use in health care.

     A substantial number of patents have been applied for by and issued to
     other pharmaceutical and biotechnology companies, and other companies may
     have filed applications for patents, may have been issued patents or may
     have obtained additional patents and proprietary rights relating to
     products or processes competitive with those of the Company.  Patent
     applications in the United States are maintained in secrecy until patents
     based thereon issue, and since publication of discoveries in the scientific
     or patent literature often lags behind actual discoveries, the Company
     cannot be certain that it or any of its licensors or collaborators were the
     first creator of inventions covered by pending patent applications or that
     it or any of such licensors or collaborators were the first to file patent
     applications for such inventions.  Consequently, there can be no assurance
     that existing patents of the Company or any patents that may be issued to
     the Company or its licensors or collaborators in the future will provide
     protection against competitive products or otherwise be commercially
     valuable.

     POTENTIAL PRODUCT LIABILITY CLAIMS

     The use of the Company's product candidates in clinical trials and the sale
     of any resulting products may expose the Company to liability claims
     resulting from the use of such candidates or products.  These claims might
     be made directly by consumers or by pharmaceutical companies or other
     sellers of such products.  While the Company currently has product
     liability insurance, there can be no assurance that such insurance will be
     sufficient to satisfy any liabilities that may arise for the Company.
     Moreover, such coverage is becoming increasingly expensive and difficult to
     obtain.  The existing coverage will not be adequate as the Company's
     product development activities progress.  There can be no assurance that
     adequate insurance coverage will be available to the Company in the future
     at an acceptable cost, if at all.  An inability to obtain sufficient
     insurance coverage at an acceptable cost or otherwise to protect against
     potential product liability claims could prevent or limit the
     commercialization of any products by the Company.  In addition, there can
     be no assurance that any product liability claims will not materially and
     adversely affect the business or financial condition of the Company.

     UNCERTAINTY OF PHARMACEUTICAL PRICING AND RELATED MATTERS; UNCERTAIN
     AVAILABILITY OF HEALTH CARE REIMBURSEMENT

     The Company's business may be materially adversely affected by the
     continuing efforts of government and third-party payors to contain or
     reduce the costs of health care through various means.  For example, in
     certain foreign markets, pricing or profitability of prescription
     pharmaceuticals is subject to government control. In the United States,
     there

                                       11
<PAGE>
 
     have been a number of federal and state proposals to implement similar
     government control. Over the last eighteen months, a number of bills
     proposing comprehensive health care reform have been introduced in
     Congress. In general, such proposals are designed to reform the health care
     system to, among other things, (i) control or reduce public and private
     spending on health care, (ii) provide for uniform health insurance benefits
     packages and administrative efficiency in the health care system, and (iii)
     provide universal access to health care within the next several years. Some
     of the proposals introduced in Congress call for a pricing regulatory
     oversight board (sometimes referred to as the Breakthrough Drug Pricing
     Committee) which may have input and/or place caps or limitations on
     pharmaceutical prices, and potential mandatory or voluntary pharmaceutical
     product rebate policies. Such proposals, if adopted, could decrease the
     price that the Company receives for any products it may sell in the future.
     There can be no assurance that such initiatives or proposals, if adopted,
     will not have an adverse effect upon the Company. In addition, there have
     been a number of federal and state proposals to subject the pricing of
     health care products and services to government control. It is uncertain
     what legislative proposals will be adopted, if any, or what actions
     federal, state or private payors for health care goods and services may
     take in response to any health care reforms and no assurance can be given
     that any such reforms will not have a material adverse effect on the
     Company. To the extent that such proposals or reforms have a material
     adverse effect on the business, financial condition and profitability of
     other pharmaceutical companies that are prospective collaborators for
     certain of the Company's product candidates, the Company's ability to
     commercialize its product candidates may be adversely affected.

     The Company's ability to commercialize pharmaceutical products may depend
     in part on the extent to which reimbursement for the costs of such products
     and related treatments will be available from government health
     administration authorities, private health insurers and others.
     Significant uncertainty exists as to the reimbursement status of newly
     approved health care products, and third-party payors are increasingly
     challenging the prices charged for medical products and services.  There
     can be no assurance that adequate third-party insurance coverage will be
     available to patients to allow the Company to establish and maintain price
     levels sufficient for realization of an appropriate return on its
     investment in developing its product candidates.  If adequate coverage and
     reimbursement levels are not provided by government and third-party payors
     for use of the Company's products, the market acceptance of these products
     will be adversely affected.  In addition, many health maintenance
     organizations and other managed care companies are seeking to negotiate
     substantial volume discounts for the sale of pharmaceutical products to
     their members thereby reducing profit margins for manufacturers, and
     competitive pressures are inducing many manufacturers to accept such
     discount arrangements.

                                       12
<PAGE>
 
                                USE OF PROCEEDS

     The net proceeds from the sale of the Shares will be received by the
     Selling Shareholders.  The Company will not receive any proceeds from the
     sale of the Shares by the Selling Stockholders.


                              SELLING STOCKHOLDERS

     The table below sets forth certain information regarding ownership of the
     Company's Common Stock and Warrants by the Selling Stockholders on March
     18, 1996 and the number of Shares to be sold by them under this Prospectus.
     The Shares include 42,074,976 shares of Common Stock which were issued or
     are issuable upon the conversion of outstanding Preferred Shares owned by
     the Selling Stockholders and 5,997,782 shares of Common Stock which were
     issued or are issuable upon the exercise of Warrants owned by the Selling
     Stockholders, which Preferred Shares and Warrants were acquired by the
     Selling Stockholders in a private placement by the Company.

     In recognition of the fact that investors may wish to be legally permitted
     to sell their Shares when they deem appropriate, the Company has filed with
     the Commission, under the Act, a Registration Statement on Form S-3, of
     which this Prospectus forms a part, with respect to the resale of the
     Shares from time to time on the Nasdaq SmallCap Market or in privately-
     negotiated transactions and has agreed to prepare and file such amendments
     and supplements to the Registration Statement as may be necessary to keep
     the Registration Statement effective until the Shares are no longer
     required to be registered for the sale thereof by the Selling Stockholders.
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
126736 CANADA, Inc.                537,250     4,306,104         3.2        4,306,104             0           0%
Strome Offshore Limited            477,500     3,827,203         2.9        3,827,203             0           0
Strome Partners, L.P.              477,500     3,827,203         2.9        3,827,203             0           0
Reliance Insurance                 375,000     3,005,657         2.3        3,005,657             0           0
 Company                                                                                           
Mr. & Mrs. Jerome J.               225,000     1,803,394         1.4        1,803,394             0           0
 Mullins                                                                                           
Strome, Susskind                   179,073     1,435,290         1.1        1,435,290             0           0
 Hedgecap Fund, L.P.                                                                               
Alfons Melohn                      150,000     1,202,264         *          1,202,264             0           0
Rahn & Bodmer                      150,000     1,202,263         *          1,202,263             0           0
Diversified Fund Ltd.              125,000     1,001,886         *          1,001,886             0           0
Robert Merrill Hunter              100,000       801,510         *            801,510             0           0
Rosalind Davidowitz                100,000       801,509         *            801,509             0           0
Vincent Lanteri and                100,000       801,509         *            801,509             0           0
 Susan Lanteri                                                                                     
Armen Partners, L.P.                87,500       701,320         *            701,320             0           0
Legong Investments                  75,000       601,133         *            601,133             0           0
 N.V.
</TABLE> 

                                       13
<PAGE>
 
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
Moussa Rahmanan &                   62,500       500,943         *            500,943             0           0
 Son                                                                                                     
Strome Hedgecap                     59,699       478,489         *            478,489             0           0
 Limited                                                                                                 
Etablissement Occramis              56,250       450,850         *            450,850             0           0
Atrix-Ventana                       53,933       432,275         *            432,275             0           0
 Investment Co., LP                                                                                      
Concordia Partners,                 50,000       400,755         *            400,755             0           0
 L.P.                                                                                                    
Dr. & Mrs. Douglas N.               50,000       400,755         *            400,755             0           0
 Benson                                                                                                  
IASD Health Services                50,000       400,755         *            400,755             0           0
 Corp.                                                                                                   
Kathryn K. Croughan                 50,000       400,755         *            400,755             0           0
Keys Foundation                     50,000       400,755         *            400,755             0           0
Lion Tower Corporation              50,000       400,755         *            400,755             0           0
Michael Bollag                      50,000       400,755         *            400,755             0           0
Porter Partners, L.P.               50,000       400,755         *            400,755             0           0
Robert A. Foisie                    50,000       400,755         *            400,755             0           0
Thomas G. Williams                  50,000       400,755         *            400,755             0           0
Vivaldi, Ltd.                       50,000       400,755         *            400,755             0           0
C.S.L. Associates, L.P.             37,500       300,567         *            300,567             0           0
Mark Berg                           37,500       300,566         *            300,566             0           0
Palmetto Partners, Ltd.             37,500       300,566         *            300,566             0           0
Pyton Finance                       37,500       300,566         *            300,566             0           0
Associated Urology                  25,000       200,378         *            200,378             0           0
 Pension Plan                                                                                            
Beverly O. Lobell                   25,000       200,378         *            200,378             0           0
Billy K. Yeh, M.D.                  25,000       200,378         *            200,378             0           0
Bios Equity Fund, L.P.              25,000       200,378         *            200,378             0           0
Bishops Merchant Group              25,000       200,378         *            200,378             0           0
 Limited                                                                                                 
Bruce Pomper                        25,000       200,378         *            200,378             0           0
Charles A. Zaffuto                  25,000       200,378         *            200,378             0           0
</TABLE> 

                                       14
<PAGE>
 
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
Debra Freedberg                     25,000       200,378         *            200,378             0           0
Debra L. Freedberg                  25,000       200,378         *            200,378             0           0
 Trust                                                                                                    
Demachy Worms & Co.                 25,000       200,378         *            200,378             0           0
 Intern'l. LTD                                                                                            
DeWind Partners, L.P.               25,000       200,378         *            200,378             0           0
EJA Management                      25,000       200,378         *            200,378             0           0
 L.L.C.                                                                                                   
Elliott Broidy                      25,000       200,378         *            200,378             0           0
Ernest Trefz                        25,000       200,378         *            200,378             0           0
Evan B. Pappas                      25,000       200,378         *            200,378             0           0
Finter Bank Zurich                  25,000       200,378         *            200,378             0           0
Halifax Fund, L.P.                  25,000       200,378         *            200,378             0           0
Herman Tauber                       25,000       200,378         *            200,378             0           0
J. Jay Lobell                       25,000       200,378         *            200,378             0           0
J.F. Shea Co., Inc.                 25,000       200,378         *            200,378             0           0
John D. Shepherd                    25,000       200,378         *            200,378             0           0
Joseph A. Natiello                  25,000       200,378         *            200,378             0           0
Larich Associates                   25,000       200,378         *            200,378             0           0
Michael P. Marcus                   25,000       200,378         *            200,378             0           0
Monument Trust                      25,000       200,378         *            200,378             0           0
 Company Ltd.                                                                                             
Mova Investments                    25,000       200,378         *            200,378             0           0
 Limited                                                                                                  
Mr. & Mrs. Delbert E.               25,000       200,378         *            200,378             0           0
 Allen, Jr.                                                                                               
Mr. & Mrs. Derek A.                 25,000       200,378         *            200,378             0           0
 Bruce                                                                                                    
Mr. & Mrs. Jeffrey C.               25,000       200,378         *            200,378             0           0
 Fernyhough                                                                                               
Mr. & Mrs. Joseph                   25,000       200,378         *            200,378             0           0
 Strassman                                                                                                
P.A.W. Offshore Fund,               25,000       200,378         *            200,378             0           0
 Ltd.
</TABLE> 

                                       15
<PAGE>
 
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
Patrick M. Kane                     25,000       200,378         *            200,378             0           0
Peter W. Frautschi                  25,000       200,378         *            200,378             0           0
Robert J. Whetten                   25,000       200,378         *            200,378             0           0%
Robert Rehme                        25,000       200,378         *            200,378             0           0
Roger C. Keys                       25,000       200,378         *            200,378             0           0
Sagres Group LTD.                   25,000       200,378         *            200,378             0           0
Scoggin Capital                     25,000       200,378         *            200,378             0           0
 Management, L.P.                                                                                         
Sharyar & Babok                     25,000       200,378         *            200,378             0           0
 Baradaran                                                                                                
Shriya Investment                   25,000       200,378         *            200,378             0           0
 Holdings Limited                                                                                         
Termtec, Ltd.                       25,000       200,378         *            200,378             0           0
The Holding Company                 25,000       200,378         *            200,378             0           0
Thomas R. Ulie                      25,000       200,378         *            200,378             0           0
Uzi Zucker                          25,000       200,378         *            200,378             0           0
Winward Venture                     25,000       200,378         *            200,378             0           0
 Partners, Inc.                                                                                           
Ventana Growth Capital              21,068       168,859         *            168,859             0           0
 Fund V, L.P.                                                                                             
Albert Milstein                     18,750       150,284         *            150,284             0           0
Neil and Laurie Spindel             18,750       150,283         *            150,283             0           0
Robert Klein, M.D.                  18,750       150,283         *            150,283             0           0
The Lincoln Fund Tax                18,750       150,283         *            150,283             0           0
 Advantaged, L.P.                                                                                         
Amram Kass P.C.                     14,250       114,216         *            114,216             0           0
 Defined Benefit Pension                                                                                  
 Plan                                                                                                     
Richard Elkin                       13,750       110,208         *            110,208             0           0
Alan Weiss                          12,500       100,189         *            100,189             0           0
Andre P. Visser                     12,500       100,189         *            100,189             0           0
Arnold Byer and Marisa              12,500       100,189         *            100,189             0           0
 Byer                                                                                                     
Arthur or Sean Kohn                 12,500       100,189         *            100,189             0           0
</TABLE> 

                                       16
<PAGE>
 
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
Bridgewater Partners,               12,500       100,189         *            100,189             0           0
 L.P.                                                                                                     
Carlos Plancarte Garcia             12,500       100,189         *            100,189             0           0
 Naranjo                                                                                                  
Colony Partners, A                  12,500       100,189         *            100,189             0           0
 California GP                                                                                            
Daniel F. Herrmann                  12,500       100,189         *            100,189             0           0
Debra Potter                        12,500       100,189         *            100,189             0           0
Frank J. Lincoln, Jr.               12,500       100,189         *            100,189             0           0
GHA Management                      12,500       100,189         *            100,189             0           0
 Corporation                                                                                              
Harold S. Goldstein                 12,500       100,189         *            100,189             0           0
Harris R. L. Lydon                  12,500       100,189         *            100,189             0           0
Indian Creek Capital,               12,500       100,189         *            100,189             0           0
 Ltd.                                                                                                     
Jeffrey S. Gutfreund                12,500       100,189         *            100,189             0           0
Jonathan Kurt                       12,500       100,189         *            100,189             0           0
Leonard J. Adams                    12,500       100,189         *            100,189             0           0
Marjorie L. Stieduhar               12,500       100,189         *            100,189             0           0
Marvin G. Barish                    12,500       100,189         *            100,189             0           0
Michael Cantor                      12,500       100,189         *            100,189             0           0
Michael Kubin and                   12,500       100,189         *            100,189             0           0
 Nicole Kubin                                                                                             
Mr. & Mrs. Amnon                    12,500       100,189         *            100,189             0           0
 Barness                                                                                                  
Myron M. Teitelbaum,                12,500       100,189         *            100,189             0           0
 M.D.                                                                                                     
Old Oly, J.V.                       12,500       100,189         *            100,189             0           0
Ralph S. O'Connor                   12,500       100,189         *            100,189             0           0
RHL Associates, L.P.                12,500       100,189         *            100,189             0           0
Robert P. Gordon                    12,500       100,189         *            100,189             0           0
Schottenfeld Associates,            12,500       100,189         *            100,189             0           0
 L.P.
</TABLE> 

                                       17
<PAGE>
 
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
The Townsen Family                  12,500       100,189         *            100,189             0           0
 Trust                                                                                                    
Tis Prager                          12,500       100,189         *            100,189             0           0
Wayne Saker                         12,500       100,189         *            100,189             0           0
Lifelines Care, Inc.                10,000        80,151         *             80,151             0           0
Scott G. Sandler                    10,000        80,151         *             80,151             0           0
Harriet Brother & Bruce              8,750        70,132         *             70,132             0           0
 Leibowitz                                                                                                
Ronald S. Baruch                     8,750        70,132         *             70,132             0           0
Martin Zelman                        7,500        60,114         *             60,114             0           0
Mechie Nebenzahl                     7,500        60,114         *             60,114             0           0
Aaron Speisman (IRA)                 6,250        50,095         *             50,095             0           0
 JMS Inc. Cust. FBO                                                                                       
Alfred D. Morgan                     6,250        50,095         *             50,095             0           0
Amy Goldberg                         6,250        50,095         *             50,095             0           0
Arie Belldegrun                      6,250        50,095         *             50,095             0           0
Dan Valahu                           6,250        50,095         *             50,095             0           0
Edward Julie                         6,250        50,095         *             50,095             0           0
Frederick J. Korniewicz              6,250        50,095         *             50,095             0           0
Geun-Eun Kim                         6,250        50,095         *             50,095             0           0
Jeffrey C. Hoos, DMD                 6,250        50,095         *             50,095             0           0
Lewis Cohen                          6,250        50,095         *             50,095             0           0
Lindsay A. McManus                   6,250        50,095         *             50,095             0           0%
M. Rafael Gonalez                    6,250        50,095         *             50,095             0           0
 Cavillo                                                                                                  
Marathon Agents Profit               6,250        50,095         *             50,095             0           0
 Sharing                                                                                                  
Mark H. Maier                        6,250        50,095         *             50,095             0           0
Martin S. Kratchman                  6,250        50,095         *             50,095             0           0
Martine Rothblatt                    6,250        50,095         *             50,095             0           0
Michael C. Miles                     6,250        50,095         *             50,095             0           0
Mr. & Mrs. Alan Wise                 6,250        50,095         *             50,095             0           0
</TABLE> 

                                       18
<PAGE>
 
<TABLE>
<CAPTION>
 
Name of Selling             Warrants Owned       Shares Owned Prior      Shares Being         Shares Owned
Shareholder                                      to Offering (1)(2)         Offered           After Offering
 
                                               Number of     Percent                      Number of     Percent
                                                Shares                                     Shares 
<S>                         <C>                <C>           <C>         <C>              <C>           <C>      
Mr. & Mrs. Steve Beane               6,250        50,095         *             50,095             0           0
Ofelia Anton Gomez                   6,250        50,095         *             50,095             0           0
Robert E. Spivak                     6,250        50,095         *             50,095             0           0
 Associates, Inc.                                                                                         
Robert J. Conrads                    6,250        50,095         *             50,095             0           0
Ross D. Ain                          6,250        50,095         *             50,095             0           0
Seymour Buehler                      6,250        50,095         *             50,095             0           0
Stephen Unger and                    6,250        50,095         *             50,095             0           0
 Kathleen Unger                                                                                           
Stuart Schube                        6,250        50,095         *             50,095             0           0
Techknoledge                         6,250        50,095         *             50,095             0           0
 Consulting Inc.                                                                                          
Elke R. de Ramirez                   5,000        40,076         *             40,076             0           0
Jeffrey Rothenberg,                  5,000        40,076         *             40,076             0           0
 DDS                                                                                                      
Mark B. Fisher                       5,000        40,076         *             40,076             0           0
Sal and Lorraine                     5,000        40,076         *             40,076             0           0
 Albanese                                                                                                 
Anthony J. Gerace                    3,750        30,057         *             30,057             0           0
Mr. & Mrs. Donald R.                 3,750        30,057         *             30,057             0           0
 Kendall, Jr.                                                                                             
William G. McCahey                   3,125        25,048         *             25,048             0           0
Alain M. Oberrotman                  2,500        20,038         *             20,038             0           0
Alan Mitchell Troyetsky              2,500        20,038         *             20,038             0           0
Bruce Carver Jackson                 2,500        20,038         *             20,038             0           0
Chaim Herman                         2,500        20,038         *             20,038             0           0
Jon D. Blakesberg                    2,500        20,038         *             20,038             0           0
Richard M. Liling                    2,500        20,038         *             20,038             0           0
Blumen Partners                      1,875        15,029         *             15,029             0           0
Mr. & Mrs. Brian                     1,250        10,019         *             10,019             0           0
 Johnston
     ____________________
</TABLE>

                                       19
<PAGE>
 
     *    Less than one percent.

     (1)  Assumes the conversion of all outstanding Preferred Shares and the
          exercise of all outstanding Warrants owned by the Selling
          Stockholders.

     (2)  Based on shares of Common Stock outstanding as of April 16, 1996 and
          includes 42,074,976 shares of Common Stock which were issued or are
          issuable upon the conversion of outstanding Preferred Shares owned by
          the Selling Stockholders and 5,997,782 shares of Common Stock which
          were issued or are issuable upon the exercise of outstanding Warrants
          owned by the Selling Stockholders.



                              PLAN OF DISTRIBUTION

     The Shares offered hereby by the Selling Stockholders may be sold from time
     to time by any such Selling Stockholder, or by pledgees, donees,
     transferees or other successors in interest.  Such sales may be made on one
     or more exchanges or in the over-the-counter market (including the Nasdaq
     SmallCap Market), or otherwise at prices and at terms then prevailing or at
     prices related to the then-current market price, or in negotiated
     transactions.  The Shares may be sold by one or more of the following
     methods, including, without limitation:  (a) a block trade in which the
     broker-dealer so engaged will attempt to sell the Shares 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 transactions between the Selling
     Stockholders and purchasers without a broker-dealer.  In effecting sales,
     brokers or dealers engaged by the Selling Stockholders may arrange for
     other brokers or dealers to participate.  Such brokers or dealers may
     receive commissions or discounts from the Selling Stockholders in amounts
     to be negotiated immediately prior to the sale.  Such brokers or dealers
     and any other participating brokers or dealers may be deemed to be
     "underwriters" within the meaning of the Securities Act, in connection with
     such sales.  In addition, any securities covered by this Prospectus that
     qualify for sale pursuant to Rule 144 under the Securities Act might be
     sold under Rule 144 rather than pursuant to this Prospectus.

     Upon the Company being notified by any Selling Shareholder that a material
     arrangement has been entered into with a broker or dealer for the sale of
     shares through a block trade, special offering, exchange distribution or
     secondary distribution or a purchase by a broker or dealer, a supplemented
     Prospectus will be filed, if required, pursuant to Rule 424(c) under the
     Securities Act, disclosing (a) the name of each such broker-dealer, (b) the
     number of shares involved, (c) the price at which such shares were sold,
     (d) the commissions paid or discounts or concessions allowed to such
     broker-dealer(s), which applicable, (e) that such broker-dealer(s) did not
     conduct any investigation to verify the information set out or incorporated
     by reference in this Prospectus, as supplemented, and (f) other facts
     material to the transaction.

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

                                       20
<PAGE>
 
     The Company has agreed to indemnify the Selling Stockholders in certain
     circumstances against certain liabilities, including liabilities arising
     under the Securities Act.  Each Selling Stockholder has agreed to indemnify
     the Company, its directors and its officers who sign the Registration
     Statement against certain liabilities, including liabilities arising under
     the Securities Act.

                                       21
<PAGE>
 
                   DESCRIPTION OF SECURITIES TO BE REGISTERED

     Common Stock

     The description of the Company's Common Stock is contained in the Company's
     Registration Statement on Form 8-A filed under the Exchange Act, including
     any amendment or reports filed for the purpose of updating such
     description, and is incorporated herein by reference.

     Warrants

            Exercise Price and Terms

     Each Warrant entitles the holder thereof to purchase one share of Common
     Stock at an exercise price of $.6708.  Warrants are issued, subject to
     adjustment in accordance with the adjustment provisions referred to below.
     The Warrants may be exercised upon surrender of the Warrant certificate on
     or prior to February 28, 2006 (or, if redeemed prior thereto, the date
     immediately preceding the redemption date) at the offices of the Warrant
     Agent, with the subscription form on the reverse side of the Warrant
     certificate completed as indicated, accompanied by payment of the full
     exercise price (by cashier's or certified check payable to the order of the
     Warrant Agent, or by wire transfer) for the number of Warrants being
     exercised.  No fractional shares will be issued upon exercise of the
     Warrants, and the Company will pay cash in lieu of fractional shares.
     After February 28, 2006, Warrants will become void and of no value.

            Adjustments

     The exercise price and the number of shares of Common Stock purchasable
     upon the exercise of the Warrants are subject to adjustments upon the
     occurrence of certain events, such as stock dividend or stock splits of the
     Common Stock.  Additionally, an adjustment would be made in the case of the
     reclassification or exchange of the Common Stock, consolidation or merger
     of the Company with or into another corporation or sale of all or
     substantially all of the assets of the Company, in order to enable Warrant
     holders to acquire the kind and number of shares of Common Stock that might
     otherwise have been purchased upon the exercise of the Warrant.  No
     adjustment to the exercise price of the shares subject to the Warrants will
     be made for dividends (other than dividends in the form of stock), if any,
     paid on the Common Stock.

            Redemption

     The Warrants are subject to redemption by the Company at $.10 per share for
     each share subject to each Warrant on 60 days prior written notice provided
     that the closing bid quotation for the Common Stock as reported on the
     Nasdaq SmallCap Market, or on such exchange on which the Common Stock is
     then traded exceeds 200% of the exercise price per share for 20 consecutive
     trading days ending three days prior to the date of redemption.  The
     Warrants are not redeemable on or prior to February 28, 1997.

                                       22
<PAGE>
 
            Warrant Holder Not a Stockholder

     The Warrants do not confer upon holders thereof any voting or other rights
     of a stockholder of the Company.  The shares of Common Stock issuable upon
     exercise of the Warrants in accordance with the terms thereof will be fully
     paid and nonassessable.

            Transfer and Warrant Agent

     The transfer and warrant agent for the Common Stock is Continental Stock
     Transfer & Trust Company, 2 Broadway, New York, New York 10004.


                                 LEGAL OPINION

     The validity of the shares of Common Stock offered hereby will be passed
     upon for the Company by Ballard Spahr Andrews & Ingersoll, Philadelphia,
     Pennsylvania.


                                    EXPERTS

     The Consolidated Financial Statements of Greenwich and its subsidiary,
     Greenwich Pharmaceuticals International Incorporated, as of December 31,
     1994 and 1993 and for each of the three years in the period ended December
     31, 1994 incorporated by reference in this Prospectus, have been audited by
     Arthur Andersen LLP, independent public accountants, as indicated in their
     report with respect thereto, and is included herein in reliance upon the
     authority of said firm as experts in giving said reports.  Reference is
     made to said report which contains an explanatory paragraph relating to
     Greenwich's ability to continue as a going concern as discussed in Note 1
     to the consolidated financial statements incorporated herein.  Arthur
     Andersen LLP did not audit the financial statements of Greenwich for the
     period from inception to December 31, 1988.  Such statements are included
     in from inception to December 31, 1994 totals.  The statements of
     operations, stockholders' equity and cash flows of Greenwich for the period
     from inception (February 1969) to December 31, 1988 (not presented or
     incorporated by reference separately herein) have been audited by Deloitte
     & Touche LLP, independent auditors, as stated in their report, which is
     incorporated herein by reference and has been so incorporated in reliance
     upon the report of such firm given upon their authority as experts in
     accounting and auditing.  Such report includes an explanatory paragraph
     that states that the ultimate success of Greenwich's development program is
     dependent upon future events, the outcome of which is currently
     undeterminable, and is also dependent upon obtaining additional financing
     adequate to fulfill its development activities and achieving a level of
     revenues adequate to support Greenwich's cost structure.
         
     The consolidated financial statements of the Company as of December 31,
     1995 and 1994, for the three years ended December 31, 1995 and for the
     period from inception (October 16, 1992) through December 31, 1995,
     incorporated by reference in this Prospectus from the Company's Annual
     Report on Form 10-K for the year ended December 31, 1995, have been so
     included in reliance on the report      

                                       23
<PAGE>
 
     of Price Waterhouse LLP, independent accountants, given on the authority of
     said firm as experts in auditing and accounting.

                                       24
<PAGE>
 
================================================================================
     No dealer, salesperson or any other individual has been authorized to give
any information or to make any representations not contained in this Prospectus
in connection with the offer covered by this Prospectus. If given or made, such
information or representations must not be relied upon as having been authorized
by the Company or the Selling Stockholders. This Prospectus does not constitute
an offer to sell, or a solicitation of an offer to buy, any of these securities
in any jurisdiction where, or to any person whom, it is unlawful to make such
offer or solicitation. Neither the delivery of this Prospectus nor any offer or
sale made hereunder shall, under any circumstances, create any implication that
there has been no change in the affairs of the Company or that the information
contained herein is correct as of any time subsequent to the date hereof.
                                                
                                                 
                               TABLE OF CONTENTS
                               ----------------- 
                                                             
                                                                   PAGE
                                                                   ----
Available Information
Incorporation of Certain
 Documents by Reference
The Company
Risk Factors
Use of Proceeds
Selling Stockholders
Plan of Distribution
Description of Securities
 to be Registered
Legal Opinion
Experts
 
                            ----------------------
                                                               
================================================================================
 
                                48,072,758 Shares
                             
                             
                             
                           BOSTON LIFE SCIENCES, INC
                             
                             
                             
                             
                             
                             
                                 Common Stock
                             
                                   Warrants
                             
                             
                             
                               ----------------
                                  PROSPECTUS
                               ----------------



                                                
                                May  , 1996      

================================================================================
<PAGE>
 
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


     Item 14.  Other Expenses of Issuance and Distribution

     The following table sets forth the costs and expenses of the sale and
     distribution of the securities being registered, all of which are being
     borne by the Company.

<TABLE>    
<CAPTION>
 
<S>                                                             <C>
     Securities and Exchange Commission filing fee..............   $15,747.97
     Printing expenses..........................................    15,000.00
     Legal fees and expenses....................................    13,000.00
     Miscellaneous..............................................          -0-
       Total....................................................   $43,747.97
 
</TABLE>     

     All of the amounts shown are estimates except for the fee payable to the
     Securities and Exchange Commission.


     Item 15.  Indemnification of Directors and Officers

       The Delaware General Corporation Law authorizes the Company to grant
     indemnities to directors and officers in terms sufficiently broad to permit
     indemnification of such persons under certain circumstances for liabilities
     (including reimbursement for expenses incurred) arising under the
     Securities Act of 1933.  In addition, the Company has obtained Directors'
     and Officers' Liability Insurance, which insures its officers and directors
     against certain liabilities such persons may incur in their capacities as
     officers or directors of the Company.

       Article 6 of the Company's Amended and Restated Certificate of
     Incorporation provides as follows:

            SIXTH:  No director of the Corporation shall be personally liable to
            the Corporation or any of its stockholders for monetary damages for
            breach of fiduciary duty as a director, except for liability (i) for
            any breach of the director's duty of loyalty to the Corporation or
            its stockholders, (ii) for acts or omissions not in good faith or
            which involve intentional misconduct or a knowing violation of law,
            (iii) under Section 174 of the Delaware General Corporation Law, as
            the same exists or hereafter may be amended, or (iv) for any
            transaction from which the director derived an improper personal
            benefit.  If the Delaware General Corporation Law hereafter is
            amended to authorize the further elimination or limitation of the
            liability of directors, then the liability of a director of the
            Corporation, in addition to the limitation on personal liability
            provided herein, shall be limited to the fullest extent permitted by
            the amended Delaware General Corporation Law.  Any repeal or
            modification of this paragraph by the stockholders of the
            Corporation shall be prospective only, and shall not adversely
            affect any limitation on the personal liability of a director of the
            Corporation existing at the time of such repeal or modification.


                                     II-1
<PAGE>
 
     Item 16.  Exhibits

       The following is a list of exhibits filed as part of this Registration
     Statement.

     Exhibit
     Number    Description
     ------    -----------
         
     4.1       Specimen copy of stock certificate for shares of Common Stock of
               the Registrant (filed as an exhibit to the Registrant's
               Registration Statement on Form S-3 filed with the Securities and
               Exchange Commission, Registration Number 33-25955.

     4.2       Form of Warrant Agreement by and among Registrant, the Warrant 
               Agent and Paramount Capital, Inc.

     4.3       Form of Warrant Certificate for Purchase of Common Stock.

     5         Opinion of Ballard Spahr Andrews & Ingersoll regarding legality
               of the Company's Common Stock being registered.

     23.1      Consent of Ballard Spahr Andrews & Ingersoll (included in its
               opinion filed as Exhibit 5 hereto).

     23.2      Consent of Price Waterhouse LLP.     
              
     24        Powers of Attorney (included on signature pages to this
               Registration Statement).


     Item 17.  Undertakings

            The undersigned registrant hereby undertakes:

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

                 (i)    To include any prospectus required by section 10(a)(3)
            of the Securities Act of 1933;
                
                 (ii)   To reflect in the prospectus any facts or events arising
            after the effective date of the registration statement (or the most
            recent post-effective amendment thereof) which, individually or in
            the aggregate, represent a fundamental change in the information set
            forth in the registration statement. Notwithstanding the foregoing,
            any increase or decrease in volume of securities offered (if the
            total dollar value of securities offered would not exceed that which
            was registered) and any deviation from the low or high end of the
            estimated maximum offering range may be reflected in the form of
            prospectus filed with the Commission pursuant to Rule 424(b) if, in
            the aggregate, the changes in volume and price represent no more
            than a 20% change in the maximum aggregate offering price set forth
            in the "Calculation of Registration Fee" table in the effective
            registration statement.     

                 (iii)  To include any material information with respect to the
            plan of distribution not previously disclosed in the registration
            statement or any material change to such information in the
            registration statement;
         
     Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) of this section
     do not apply if the registration statement is on Form S-3, Form S-8 or 
     Form F-3, and the information required to be included in a post-effective 
         

                                     II-2
<PAGE>
 
         
     amendment by those paragraphs is contained in periodic reports filed with
     or furnished to the Commission 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) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
         
          (4) If the registrant is a foreign private issuer, to file a post-
     effective amendment to the registration statement to include any financial
     statements required by (S) 210.3-19 of this chapter at the start of any
     delayed offering or throughout a continuous offering.  Financial statements
     and information otherwise required by Section 10(a)(3) of the Act need not
     be furnished, provided that the registrant includes in the prospectus, by
     means of a post-effective amendment, financial statements required pursuant
     to this paragraph (a)(4) and other information necessary to ensure that all
     other information in the prospectus is at least as current as the date of
     those financial statements.  Notwithstanding the foregoing, with respect to
     registration statements on Form F-3, a post-effective amendment need not be
     filed to include financial statements and information required by section
     10(a)(3) of the Act or (S) 210.3-19 of this chapter if such financial
     statements and information are contained in periodic reports filed with or
     furnished to the Commission 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 Form F-3.     

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


                                     II-3
<PAGE>
 
                                   SIGNATURES
         
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
     has duly caused this Amendment No. 1 to Registration Statement to be signed
     on its behalf by the undersigned, thereunto duly authorized, in the City of
     Waltham, Commonwealth of Massachusetts, on May __, 1996.     

                                   BOSTON LIFE SCIENCES, INC.
                                  
                                  
                                   By: /s/ S. David Hillson
                                       -----------------------------------------
                                          S. David Hillson
                                          President and Chief Executive Officer

         
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
     No. 1 to Registration Statement has been signed by the following persons in
     the capacities and on the dates indicated.     
              

<TABLE>     
<CAPTION> 
            Signature                    Title                           Date
            ---------                    -----                           ----
     <S>                           <C>                              <C> 
     /s/ S. David Hillson          President and Chief Executive    May __, 1996
     ----------------------------- Officer and Director (Principal     
     S. David Hillson              Executive Officer)                 
                               
               *                   Director and Chairman
     -----------------------------                    
     Edson D. de Castro        
                               
               *                   Director and Secretary
     -----------------------------                     
     Steve H. Kanzer, Esq.     
                               
               *                   Director, Executive Vice President
     ----------------------------- and Chief Scientific Officer   
     Marc E. Lanser, M.D.          
                               
               *                   Director
     -----------------------------
     Ira K. Lieberman, Ph.D.   
                               
               *                   Director
     -----------------------------            
     E. Christopher Palmer, C.P.A.


        *  By: /s/ S. David Hillson
               ---------------------------
               S. David Hillson

</TABLE>      


                                     II-4
<PAGE>
 
                                 EXHIBIT INDEX
                                 -------------

<TABLE>    
<CAPTION>
 
 
Exhibit
Sequential                                                           Sequential
Number      Description                                              Page Number
- ----------  -----------                                              -----------
<C>         <S>                                                      <C>
4.1         Specimen copy of stock certificate for shares of Stock             -
            of the Registrant (filed as an exhibit to the
            Company's Registration Statement on Form S-3 filed
            with the Securities and Exchange Commission,
            Registration Number 33-25955.


4.2         Form of Warrant Agreement by and among Registrant, the Warrant Agent
            and Paramount Capital, Inc.

4.3         Form of Warrant Certificate for Purchase of Common Stock.


5           Opinion of Ballard Spahr Andrews & Ingersoll regarding            37
            legality of the Company's Common Stock being
            registered.

23.1        Consent of Ballard Spahr Andrews & Ingersoll (included            37
            in its opinion filed as Exhibit 5 hereto).

23.2        Consent of Price Waterhouse LLP.                                  39

23.3        Consent of Deloitte & Touche LLP                                  41

23.4        Consent of Arthur Andersen LLP                                    43

</TABLE>     


                                     II-5

<PAGE>
 
                               WARRANT AGREEMENT
                               -----------------

     AGREEMENT (this "Agreement") dated as of [    ], 1995, by and among BOSTON
LIFE SCIENCES, INC., a Delaware corporation (the "Company"), [          ], as
warrant agent (the "Warrant Agent"), and PARAMOUNT CAPITAL, INC., a New York 
corporation ("Paramount").

                              W I T N E S S E T H
                              - - - - - - - - - -

     WHEREAS, in connection with a private placement (the "Private Placement")
of units (each, a "Unit"), consisting of (a) 1,000 shares of the Premium
Preferred Stock, stated value $100.00 per share (the "Preferred Stock"), and
(b) warrants (the "Common Stock Warrants") to purchase 25,000 shares of common
stock, par value $.01 per share (the "Common Stock"), with a minimum of 10 Units
(the "Minimum Offering") and a maximum of ___ Units (the "Maximum Offering") 
sold through this offering (the "Offering"); and

     WHEREAS, the Company desires the Warrant Agent to act on behalf of the
Company, and the Warrant Agent is willing to so act, in connection with the
issuance, registration, transfer, exchange and redemption of the Warrants, the
issuance of certificates representing the Warrants, the exercise of the
Warrants, and the rights of the holders thereof;

     NOW THEREFORE, in consideration of the premises and the mutual agreements
hereinafter set forth and for the purpose of defining the terms and provisions
of the Warrants and the certificates representing the Warrants and the
respective rights and obligations thereunder of the Company, the holders of
certificates representing the Warrants and the Warrant Agent, the parties hereto
agree as follows:

     SECTION 1. Definitions. As used herein, the following terms shall have the
                -----------
following meanings:

     (a) "Common Stock" shall mean stock of the Company of any class, whether
now or hereafter authorized which has the right to participate in the
distributions of earnings and assets of the Company without limit as to amount
or percentage, which at the date hereof consists of 175,000,000 authorized
shares of Common Stock.

     (b) "Corporate Office" shall mean the office of the Warrant Agent (or its
successor) at which at any particular time its principal business shall be
administered, which office is located at the date hereof at Reservoir Place, 
1601 Trapelo Road, Waltham, MA, 02154.

     (c) "Exercise Date" shall mean, as to any Warrant, the date on which the
Warrant Agent shall have received both (a) the Warrant Certificate representing
such Warrant, with the exercise form thereon duly executed by the Registered
Holder thereof or

                                       1
<PAGE>
 
his attorney duly authorized in writing, and (b) payment in cash, or by official
bank or certified check made payable to the Company, of an amount in lawful 
money of the United States of America equal to the applicable Purchase Price.

     (d)  "Purchase Price" shall mean the purchase price to be paid upon 
exercise of each Warrant in accordance with the terms hereof, which price shall 
be equal to the lesser of (a) $1.00 per share and (b) the average closing bid 
price of the Common Stock on the National Association of Securities Dealers Inc.
Automated Quotation System ("Nasdaq") for the thirty consecutive trading days 
immediately preceding the Closing Date on which such Warrants are issued, 
subject to adjustment from time to time pursuant to the provisions of Section 8 
hereof, and subject to the Company's right to reduce the Purchase Price upon 
notice to all warrantholders.

     (e)  "Registered Holder" shall mean the person in whose name any 
certificate representing Warrants shall be registered on the books maintained by
the Warrant Agent pursuant to Section 6.

     (f)  "Transfer Agent" shall mean,____________________ as the Company's 
transfer agent, or its authorized successor, as such.

     (g)  "Warrant Expiration Date" shall mean 5:00 P.M. (New York time) on 
[      ], 2005; provided that if such date shall in the State of New York be a 
holiday or a day on which banks are authorized to close, then 5:00 P.M. (New
York time) on the next following day which in the State of New York is not a
holiday or a day on which banks are authorized to close. Upon notice to all
warrantholders the Company shall have the right to extend the Warrant Expiration
Date.

     SECTION 2. Warrants and Issuance of Warrant Certificates.
                ----------------------------------------------

     (a)  A Warrant shall initially entitle the Registered Holder of the Warrant
Certificate representing such Warrant to purchase one share of Common Stock upon
the exercise thereof, in accordance with the terms hereof, subject to 
modification and adjustment as provided in Section 8.

     (b)  From time to time, up to the Warrant Expiration Date, the Transfer 
Agent shall execute and deliver stock certificates in required whole number 
denominations representing up to an aggregate of 3,300,000 shares of Common 
Stock, subject to adjustment as described herein, upon the exercise of Warrants 
in accordance with this Agreement.

     (c)  From time to time, up to the Warrant Expiration Date, the Warrant 
Agent shall execute and deliver Warrant Certificates in required whole number 
denominations to the persons entitled thereto in connection with any transfer 
or exchange permitted under this Agreement; provided that no Warrant 
Certificates shall be issued except (i) those initially issued hereunder, (ii) 
those issued on or after the Initial Warrant Exercise

                                       2
<PAGE>
 
Date, upon the exercise of fewer than all Warrants represented by any Warrant 
Certificate, to evidence any unexercised Warrants held by the exercising 
Registered Holder, (iii) those issued upon any transfer or exchange pursuant to 
Section 6; (iv) those issued in replacement of lost, stolen, destroyed  or 
mutilated Warrant Certificates pursuant to Section 7; and (v) at the option of 
the Company, in such form as may be approved by the its Board of Directors, to 
reflect (a) any adjustment or change in the Purchase Price or the number of 
shares of Common Stock purchasable upon exercise of the Warrants, made pursuant 
to Section 8 hereof and (b) other modifications approved by Warrantholders in 
accordance with Section 16 hereof.

     SECTION 3. Form and Execution of Warrant Certificates.
                ------------------------------------------

     (a)  The Warrant Certificates shall be substantially in the form annexed 
hereto as Exhibit A (the provisions of which are hereby incorporated herein) and
may have such letters, numbers or other marks of identification or designation 
and such legends, summaries or endorsements printed, lithographed, engraved or 
typed thereon as the Company may deem appropriate and as are not inconsistent 
with the provisions of this Agreement, or as may be required to comply with any 
law or with any rule or regulation made pursuant thereto or with any rule or 
regulation of any stock exchange on which the Warrants may be listed, or to 
conform to usage.  The Warrant Certificates shall be dated the date of issuance 
thereof (whether upon initial issuance, transfer, exchange or in lieu of 
mutilated, lost, stolen, or destroyed Warrant Certificates) and issued in 
registered form.  Warrants shall be numbered serially with the letter W.

     (b)  Warrant Certificates shall be executed on behalf of the Company by its
Chairman of the Board, President or any Vice President and by its Secretary or 
an Assistant Secretary, by manual signatures or by facsimile signatures printed 
thereon, and shall have imprinted thereon a facsimile of the Company's seal. In 
case any officer of the Company who shall have signed any of the Warrant 
Certificates shall cease to be such officer of the Company before the date of 
issuance of the Warrant Certificates and issue and delivery thereof, such 
Warrant Certificates may nevertheless be issued and delivered with the same 
force and effect as though the person who signed such Warrant Certificates had 
not ceased to be such officer of the Company.  After execution by the Company, 
Warrant Certificates shall be delivered by the Warrant Agent to the Registered 
Holder.

     SECTION 4. Exercise.
                --------

     (a)  Each Warrant may be exercised by the Registered Holder thereof at any 
time prior to the Warrant Expiration Date, upon the terms and subject to the 
conditions set forth herein and in the applicable Warrant Certificate.  A 
Warrant shall be deemed to have been exercised immediately prior to the close of
business on the Exercise Date and the person entitled to receive the securities 
deliverable upon such exercise shall be treated for all purposes as the holder 
upon exercise thereof as of the close of business on the Exercise Date.  As soon
as practicable on or after the Exercise Date, the Warrant Agent shall deposit 
the

                                       3
<PAGE>
 
proceeds received from the exercise of a Warrant, and promptly after clearance 
of checks received in payment of the Purchase Price pursuant to such Warrants, 
cause to be issued and delivered by the Transfer Agent, to the person or persons
entitled to receive the same, a certificate or certificates for the securities 
deliverable upon such exercise, (plus a certificate for any remaining 
unexercised Warrants of the Registered Holder).  Notwithstanding the foregoing, 
in the case of payment made in the form of a check drawn on an account of 
Paramount or such other investment banks and brokerage houses as the Company 
shall approve, certificates shall immediately be issued without any delay.  Upon
the exercise of any Warrant and clearance of the funds received, the Warrant 
Agent shall promptly remit the payment received for the Warrant to the Company 
or as the Company may direct in writing.

     (b)  On the Exercise Date in respect of the exercise of any Warrant, 
simultaneously with the receipt of the proceeds upon exercise of the Warrant(s) 
so exercised, the Company shall pay from the proceeds received upon exercise of 
the Warrant(s), a fee of 5% of the Purchase Price to Paramount (of which a 
portion may be reallowed by Paramount in its sole discretion to any member of 
the National Association of Securities Dealers, Inc. who solicited the 
exercise).  Within five days after exercise, the Warrant Agent shall send 
Paramount a copy of the reverse side of each Warrant exercised.  The Company 
shall reimburse the Warrant Agent, upon request, for its reasonable expenses 
relating to compliance with this Section 4(b).  In addition, Paramount may at 
any time during business hours, examine the records of the Warrant Agent, 
including its ledger of original Warrant Certificates returned to the Warrant 
Agent upon exercise of Warrants.  The provisions of this paragraph may not be 
modified, amended or deleted without the prior written consent of Paramount.

     SECTION 5.  Reservation of Shares; Listing; Payment of Taxes; etc. (a)  The
                 ----------------------------------------------------- 
Company covenants that it will at all times reserve and keep available out of 
its authorized Common Stock, solely for the purpose of issue upon exercise of 
Warrants, such number of  shares of Common Stock as shall then be issuable upon 
the exercise of all outstanding Warrants.  The Company covenants that all shares
of Common Stock which shall be issuable upon exercise of the Warrants and
payment of the Purchase Price shall, at the time of delivery, be duly and
validly issued, fully paid, nonassessable and free from all taxes, liens and
charges with respect to the issue thereof (other than those that arise as a
result of the action or inaction of the Registered Holder).

     (b)  The Company will use reasonable best efforts to obtain appropriate 
approvals or registrations under state "blue sky" securities laws with respect
to the exercise of the Warrants; provided, however, that the Company shall not
be obligated to file any general consent to service of process or qualify as a
foreign corporation in any jurisdiction. With respect to any such securities
laws, however, Warrants may not be exercised by, or shares of Common Stock
issued to, any Registered Holder in any state in which such exercise would be
unlawful.

                                       4



           
<PAGE>
 
     (c)  The Company shall pay all documentary, stamp or similar taxes and 
other governmental charges that may be imposed with respect to the issuance of 
Warrants, or the issuance, or delivery of any shares upon exercise of the 
Warrants; provided, however, that if the shares of Common Stock are to be 
delivered in a name other than the name of the Registered Holder of the Warrant 
Certificate representing any Warrant being exercised, then no such delivery 
shall be made unless the person requesting the same has paid to the Warrant 
Agent the amount of transfer taxes or charges incident thereto, if any.

     (d)  The Warrant Agent is hereby irrevocably authorized to requisition the 
Company's Transfer Agent from time to time for certificates representing shares 
of Common Stock required upon exercise of the Warrants, and the Company will 
authorize the Transfer Agent to comply with all such proper requisitions.

     SECTION 6.  Exchange and Registration of Transfer.
                 -------------------------------------

     Subject to the restrictions on transfer contained in the Warrant 
Certificates and the Subscription Agreements between the Company and the 
purchasers of Units:

     (a)  Warrant Certificates may be exchanged for other Warrant Certificates 
representing an equal aggregate number of Warrants of the same class or may be 
transferred in whole or in part; provided that no transfers, sales or other 
dispositions of the Warrants may be made except in accordance with Section 8 of 
the Subscription Agreement.  Warrant Certificates to be exchanged shall be 
surrendered to the Warrant Agent at its Corporate Office, and upon satisfaction 
of the terms and provisions hereof, the Company shall execute, and the Warrant 
Agent shall countersign, issue and deliver in exchange therefor the Warrant 
Certificate or Certificates which the Registered Holder making the exchange 
shall be entitled to receive.

     (b)  The Warrant Agent shall keep at its office books in which, subject to 
such reasonable regulations as it may prescribe, it shall register Warrant 
Certificates and the transfer thereof in accordance with its regular practice.  
Upon due presentment for registration of transfer of any Warrant Certificate at 
its office, the Company shall execute and the Warrant Agent shall issue and 
deliver to the transferee or transferees a new Warrant Certificate or 
Certificates representing an equal aggregate number of Warrants.

     (c)  With respect to all Warrant Certificates presented for registration of
transfer, or for exchange or exercise, the subscription form on the reverse 
thereof shall be duly endorsed, or be accompanied by a written instrument or 
instruments of transfer and subscription, in form satisfactory to the Company, 
duly executed by the Registered Holder or his attorney-in-fact duly authorized 
in writing.

     (d)  The Company may require payment by such holder of a sum sufficient to 
cover any tax or other governmental charge that may be imposed in connection 
therewith.
<PAGE>
 
     (e)  All Warrant Certificates surrendered for exercise or for exchange in 
case of mutilated Warrant Certificates shall be promptly canceled by the Warrant
Agent and thereafter retained by the Warrant Agent until termination of this 
Agreement or resignation of the Warrant Agent, or, with the prior written 
consent of Paramount, disposed of or destroyed, at the direction of the Company.

     (f)  Prior to due presentment for registration of transfer thereof, the 
Company and the Warrant Agent may deem and treat the Registered Holder of any 
Warrant Certificate as the absolute owner thereof and of each Warrant 
represented thereby (notwithstanding any notations of ownership of writing 
thereon made by anyone other than a duly authorized officer of the Company or 
the Warrant Agent) for all purposes and shall not be affected by any notice to 
the contrary.

     SECTION 7.  Loss or Mutilation.  Upon receipt by the Company and the
                 ------------------
Warrant Agent of evidence satisfactory to them of the ownership of and loss,
theft, destruction or mutilation of any Warrant Certificate and (in case of
loss, theft or destruction) of indemnity satisfactory to them, and (in the case
of mutilation) upon surrender and cancellation thereof, the Company shall
execute and the Warrant Agent shall (in the absence of notice to the Company
and/or Warrant Agent that the Warrant Certificate has been acquired by a
bonafide purchaser) countersign and deliver to the Registered Holder in lieu
thereof a new Warrant Certificate of like tenor representing an equal aggregate
number of Warrants. Applicants for a substitute Warrant Certificate shall comply
with such other reasonable regulations and pay such other reasonable charges as
the Warrant Agent may prescribe.

     SECTION 8.  Adjustment of Purchase Price and Number of Shares of Common 
                 ----------------------------------------------------------- 
                 Stock or Warrants.
                 -----------------

     (a)  Subject to the exceptions referred to in Section 8(g) below, in the 
event the Company shall, at any time or from time to time after the date hereof,
sell any shares of Common Stock for a consideration per share less than the then
applicable Purchase Price and  less than the current fair market value per share
of the Common Stock on the date of the sale or issue any shares of Common Stock 
as a stock dividend to the holders of Common Stock, or subdivide or combine the 
outstanding shares of Common Stock into a greater or lesser number of shares 
(any such sale, issuance, subdivision or combination being herein called a 
"Change of Shares"), then, and thereafter upon each further Change of Shares, 
the Purchase Price in effect immediately prior to such Change of Shares shall be
changed to a price (including any applicable fraction of a cent) determined by
multiplying the Purchase Price in effect immediately prior thereto by a
fraction, the numerator of which shall be the sum of the number of shares of
Common Stock outstanding immediately prior to the issuance of such additional
shares and the number of shares of Common Stock which the aggregate
consideration received (determined as provided in subsection 8(f)(F) below), if
any, for the issuance of such additional shares would purchase at such current
market price per share of Common Stock, and the denominator of which shall be
the number of shares of Common


                                       6






       
<PAGE>
 
Stock outstanding immediately after the issuance of such additional shares. Such
adjustment shall be made successively whenever such an issuance is made.

                   Upon each adjustment of the Purchase Price pursuant to this 
Section 8, the total number of shares of Common Stock purchasable upon the 
exercise of each Warrant shall (subject to the provisions contained in Section 
8(b) hereof) be such number of shares (calculated to the nearest tenth) 
purchasable at the Purchase Price immediately prior to such adjustment 
multiplied by a fraction, the numerator of which shall be the Purchase Price in 
effect immediately prior to such adjustment and the denominator of which shall 
be the Purchase Price in effect immediately after such adjustment.

              (b)  The Company may elect, upon any adjustment of the Purchase 
Price hereunder, to adjust the number of Warrants outstanding, in lieu of the 
adjustment in the number of shares of Common Stock purchasable upon the exercise
of each Warrant as hereinabove provided, so that each Warrant outstanding after 
such adjustment shall represent the right to purchase one share of Common Stock.
Each Warrant held of record prior to such adjustment of the number of Warrants 
shall become that number of Warrants (calculated to the nearest tenth) 
determined by multiplying the number one by a fraction, the numerator of which 
shall be the Purchase Price in effect immediately prior to such adjustment and 
the denominator of which shall be the Purchase Price in effect immediately after
such adjustment. Upon each adjustment of the number of Warrants pursuant to 
this Section 8, the Company shall, as promptly as practicable, cause to be 
distributed to each Registered Holder of Warrant Certificates on the date of 
such adjustment Warrant Certificates evidencing, subject to Section 10 hereof, 
the number of additional Warrants to which such Holder shall be entitled as a 
result of such adjustment or, at the option of the Company, cause to be 
distributed to such Holder in substitution and replacement for the Warrant 
Certificates held by him prior to the date of adjustment (and upon surrender 
thereof, if required by the Company) new Warrant Certificates evidencing the 
number of Warrants to which such Holder shall be entitled after such adjustment.

              (c)  In case of any reclassification, capital reorganization or 
other change of outstanding shares of Common Stock, or in case of any 
consolidation or merger of the Company with or into another corporation (other 
than a consolidation or merger in which the Company is the continuing 
corporation and which does not result in any reclassification, capital 
reorganization or other change of outstanding shares of Common Stock), or in 
case of any sale or conveyance to another corporation of the property of the 
Company as, or substantially as, an entirety (other than a sale/leaseback, 
mortgage or other financing transaction), the Company shall cause effective 
provision to be made so that each holder of a Warrant then outstanding shall 
have the right thereafter, by exercising such Warrant, to purchase the kind and 
number of shares of stock or other securities or property (including cash) 
receivable upon such reclassification, capital reorganization or other change, 
consolidation, merger, sale or conveyance by a holder of the number of shares of
Common Stock that might have been purchased upon exercise of such Warrant 
immediately prior to such reclassification, capital reorganization or other 
change, consolidation, merger, sale or

                                       7
<PAGE>
 
conveyance.  Any such provision shall include provision for adjustments that 
shall be as nearly equivalent as may be practicable to the adjustments provided 
for in this Section 8.  The foregoing provisions shall similarly apply to 
successive reclassifications, capital reorganizations and other changes of 
outstanding shares of Common Stock and to successive consolidations, mergers, 
sales or conveyances.

     (d)  Irrespective of any adjustments or changes in the Purchase Price or 
the number of shares of Common Stock purchasable upon exercise of the Warrants, 
the Warrant Certificates theretofore and thereafter issued shall, unless the 
Company shall exercise its option to issue new Warrant Certificates pursuant to 
Section 2(c) hereof, continue to express the Purchase Price per share and the 
number of shares purchasable thereunder as the Purchase Price per share, and the
number of shares purchasable were expressed in the Warrant Certificates when the
same were originally issued.

     (e)  After each adjustment of the Purchase Price pursuant to this Section
8, the Company will promptly prepare a certificate signed by the Chairman or
President of the Company setting forth: (i) the Purchase Price as so adjusted,
(ii) the number of shares of Common Stock purchasable upon exercise of each
Warrant after such adjustment, and, if the Company shall have elected to adjust
the number of Warrants, the number of Warrants to which the registered holder of
each Warrant shall then be entitled, and the adjustment in Redemption Price
resulting therefrom, and (iii) a brief statement of the facts accounting for
such adjustment. The Company will promptly file such certificate with the
Warrant Agent and cause a brief summary thereof to be sent by ordinary first
class mail to Paramount and to each registered holder of Warrants at his last
address as it shall appear on the registry books of the Warrant Agent. No
failure to mail such notice nor any defect therein or in the mailing thereof
shall affect the validity thereof except as to the holder to whom the Company
failed to mail such notice, or except as to the holder whose notice was
defective. The affidavit of an officer of the Warrant Agent or the Secretary or
an Assistant Secretary of the Company that such notice has been mailed shall, in
the absence of fraud, be prima facie evidence of the facts stated therein.

     (f)  For purposes of Section 8(a) and 8(b) hereof, the following provisions
(A) to (F) shall also be applicable:

          (A)  The number of shares of Common Stock outstanding at any given 
     time shall include shares of Common Stock owned or held by or for the
     account of the Company and the sale or issuance of such treasury shares or
     the distribution of any such treasury shares shall not be considered a
     Change of Shares for purposes of said sections

          (B)  No adjustment of the Purchase Price shall be made unless such 
     adjustment would require an increase or decrease of at least $.01 in such
     price; provided that any adjustments which by reason of this clause (B) are
     not required to be made shall be carried forward and shall be made at the
     time of

                                       8



<PAGE>
 
and together with the next subsequent adjustment which, together with any 
adjustment(s) so carried forward, shall require an increase or decrease of at 
least $.01 in the Purchase Price then in effect hereunder.

     (C)  In case of (1) the sale by the Company for cash of any rights or
warrants to subscribe for or purchase, or any options for the purchase of,
Common Stock or any securities convertible into or exchangeable for Common Stock
without the payment of any further consideration other than cash, if any (such
convertible or exchangeable securities being herein called "Convertible
Securities"), or (2) the issuance by the Company, without the receipt by the
Company of any consideration therefore, of any rights or warrants to subscribe
for or purchase, or any options for the purchase of, Common Stock or Convertible
Securities, in each case, if (and only if) the consideration payable to the
Company upon the exercise of such rights, warrants or options, shall consist of
cash, whether or not such rights, warrants or options, or the right to convert
or exchange such Convertible Securities, are immediately exercisable, and the
price per share for which Common Stock is issuable upon the exercise of such
rights, warrants or options or upon the conversion or exchange of such
Convertible Securities (determined by dividing (x) the minimum aggregate
consideration payable to the Company upon the exercise of such rights, warrants
or options, plus the consideration received by the Company for the issuance or
sale of such rights, warrants or options, plus, in the case of such Convertible
Securities, the minimum aggregate amount of additional consideration, if any,
other than such Convertible Securities, payable upon the conversion or exchange
thereof, by (y) the total maximum number of shares of Common Stock issuable upon
the exercise of such rights, warrants or options or upon the conversion or
exchange of such Convertible Securities issuable upon the exercise of such
rights, warrants or options) is less than the Market Price of the Common Stock
on the date of the issuance or sale of such rights, warrants or options, then
the total maximum number of shares of Common Stock issuable upon the exercise of
such rights, warrants or options or upon the conversion or exchange of such
Convertible Securities (as of the date of the issuance or sale of such rights,
warrants or options) shall be deemed to be outstanding shares of Common Stock
for purposes of Sections 8(a) and 8(b) hereof and shall be deemed to have been
sold for cash in an amount equal to such price per share.

     (D)  In case of the sale by the Company for cash of any Convertible 
Securities, whether or not the right of conversion or exchange thereunder is 
immediately exercisable, and the price per share for which Common Stock is 
issuable upon the conversion or exchange of such Convertible Securities 
(determined by dividing (x) the total amount of consideration received by the  
Company for the sale of such Convertible Securities, plus the minimum aggregate
amount of additional consideration, if any, other than such


                                       9
<PAGE>
 
Convertible Securities, payable upon the conversion or exchange thereof, by 
(y) the total maximum number of shares of Common Stock issuable upon the 
conversion or exchange of such convertible Securities) is less than the Market 
Price of the Common Stock on the date of the sale of such Convertible 
Securities, then the total maximum number of shares of Common Stock issuable 
upon the conversion or exchange of such Convertible Securities (as of the date 
of the sale of such Convertible Securities) shall be deemed to be outstanding 
shares of Common Stock for purposes of Sections 8(a) and 8(b) hereof and shall 
be deemed to have been sold for cash in an amount equal to such price per share.

      (E) If the exercise or purchase price provided for in any right, warrant
or option referred to in (C) above, or the rate at which any Convertible
Securities referred to in (C) or (D) above are convertible into or exchangeable
for Common Stock, shall change at any time (other than under or by reason of
provisions designed to protect against dilution), the Purchase Price then in
effect here undershall forthwith be readjusted to such Purchase Price as would
have obtained (1) had the adjustments made upon the issuance or sale of such
rights, warrants, options or Convertible Securities been made upon the basis of
the issuance of only the number of shares of Common Stock theretofore actually
delivered (and the total consideration received therefor) upon the exercise of
such rights, warrants or options or upon the conversion or exchange of such
Convertible Securities, (2) had adjustments been made on the basis of the 
Purchase Price as adjusted under clause (1) for all transactions (which would 
have affected such Purchase Price) made after the issuance or sale of such
rights, warrants, options or Convertible Securities, and (3) had any such
rights, warrants, options or Convertible Securities then still outstanding been
originally issued or sold at the time of such change. On the expiration of any
such right, warrant or option or the termination of any such right to convert or
exchange any such Convertible Securities, the Purchase Price then in effect
hereunder shall forthwith be readjusted to such Purchase Price as would have
obtained (a) had the adjustments made upon the issuance or sale of such rights,
warrants, options or Convertible Securities been made upon the basis of the
issuance of only the number of shares of Common Stock theretofore actually
delivered (and the total consideration received therefor) upon the exercise of
such rights, warrants or options or upon the conversion or exchange of such
Convertible Securities and (b) had adjustments been made on the basis of the
Purchase Price as adjusted under clause (a) for all transactions (which would
have affected such adjusted Purchase Price) made after the issuance or sale of
such rights, warrants, options or Convertible Securities.

      (F)  In case of the sale for cash of any shares of Common Stock, any 
Convertible Securities, any rights or warrants to subscribe for or purchase, or
 
                                      10

<PAGE>
 
     any options for the purchase of, Common Stock or Convertible Securities,
     the consideration received by the Company therefore shall be deemed to be
     the gross sales price therefor without deducting therefrom any expense paid
     or incurred by the Company or any underwriting discounts or commissions or
     concessions paid or allowed by the Company in connection therewith.

     (g) No adjustment to the Purchase Price of the Warrants or to the number of
shares of Common Stock purchasable upon the exercise of each Warrant will be 
made, however,

         (i)   upon the exercise of any of the options presently outstanding
     under the Company's Stock Option Plan (the "Plan") for officers, directors
     and certain other key personnel of the Company; or

         (ii)  upon the grant or exercise of any other options which may 
     hereafter be granted or exercised under the Plan; or

         (iii) upon the sale or exercise of the Warrants or any other Warrants 
     issued by the Company; or

         (iv)  upon the conversion of the Preferred Stock underlying any Units 
     sold in the Private Placement; or

         (v)   upon the issuance or sale of Common Stock upon conversion or
     exchange of any Convertible Securities, whether or not any adjustment in
     the Purchase Price was made or required to be made upon the issuance or
     sale of such Convertible Securities and whether or not such Convertible
     Securities were outstanding on the date of the original sale of the
     Warrants or were thereafter issued or sold; or

         (vi)  upon any amendment to or change in the terms of any rights or
     warrants to subscribe for or purchase, or options for the purchase of,
     Common Stock or Convertible Securities or in the terms of any Convertible
     Securities, including, but not limited to, any extension of any expiration
     date of any such right, warrant or option, any change in any exercise or
     purchase price provided for in any such right, warrant or option, any
     extension of any date through which any Convertible Securities are
     convertible into or exchangeable for Common Stock or any change in the rate
     at which any Convertible Securities are convertible into or exchangeable
     for Common Stock (other than rights, warrants, options or Convertible
     Securities issued or sold after the close of business on the date of the
     original issuance of the Warrants (i) for which an adjustment in the
     Purchase Price then in effect was theretofore made or required to be made,
     upon the issuance or sale thereof, or (ii) for which such an adjustment
     would have been required had the exercise or purchase price of

                                      11
<PAGE>
 
      such rights, warrants or options at the time of the issuance or sale
      thereof or the rate of conversion or exchange of such Convertible
      Securities, at the time of the sale of such Convertible Securities, or the
      issuance or sale of rights or warrants to subscribe for or purchase, or
      options for the purchase of, such Convertible Securities, been the price
      or rate as changed, in which case the provisions of Section 8(f)(E) hereof
      shall be applicable if, but only if, the exercise or purchase price
      thereof, as changed, or the rate of conversion or exchange thereof, as
      changed, consists of cash or requires the payment of additional
      consideration, if any, consisting of cash and the Company did not receive
      any consideration other than cash, if any, in connection with such
      change).

      (h)  As used in this Section 8, the term "Common Stock" shall mean and 
include the Company's Common Stock authorized on the date of the original issue 
of the Units and shall also include any capital stock of any class of the 
Company thereafter authorized which shall not be limited to a fixed sum or 
percentage in respect of the rights of the holders thereof to participate in 
dividends and in the distribution of assets upon the voluntary liquidation, 
dissolution or winding up of the Company; provided, however, that the shares 
issuable upon exercise of the Warrants shall include only shares of such class 
designated in the Company's Certificate of Incorporation as Common Stock on the 
date of the original issue of the Units or (i), in the case of any 
reclassification, change, consolidation, merger, sale or conveyance of the 
character referred to in Section 8(c) hereof, the stock, securities or property 
provided for in such section or (ii), in the case of any reclassification or 
change in the outstanding shares of Common Stock issuable upon exercise of the 
Warrants as a result of a subdivision or combination or consisting of a change 
in par value, or from par value to no par value, or from no par value to par 
value, such shares of Common Stock as so reclassified or changed.

      (i)  Any determination as to whether an adjustment in the Purchase Price 
in effect hereunder is required pursuant to Section 8, or as to the amount of 
any such adjustment, if required, shall be binding upon the holders of the 
Warrants and the Company if made in good faith by the Board of Directors of the 
Company.

      (j)  If and whenever the Company shall declare any dividends or 
distributions or grant to the holders of Common Stock, as such, rights or 
warrants to subscribe for or to purchase, or any options for the purchase of, 
Common Stock or securities convertible into or exchangeable for or carrying a 
right, warrant or option to purchase Common Stock, the Company shall notify each
of the then Registered Holders of the Warrants of such event prior to its 
occurrence to enable such Registered Holders to exercise their Warrants and 
participate as holders of Common Stock in such event.

                                      12
<PAGE>
SECTION 9. Redemption
           ----------
 
      (a)  The Warrant is not redeemable at the option of the company prior to 
[ ], 1996. The Warrant may be redeemed at the election of the Company, in whole 
but not in part, at any time on or after [  ], 1996, at $.10 per Warrant (the 
"Redemption Price") provided that either (i) the closing bid quotation for the 
Common Stock as reported on Nasdaq, or on such other exchange on which the 
Common Stock is then traded, exceeds 200% of the Purchase Price for twenty (20) 
consecutive trading days ending three days prior to the date of redemption.

      (b)  The election of the Company to redeem the Warrants shall be 
evidenced by a resolution of the board of directors of the Company, which shall
be delivered to the Warrant Agent and Paramount at or prior to the date of 
notice of redemption.

      (c)  At the sole cost and expense of the Company notice of redemption
shall be given by the Company, or at the Company's request, by the Warrant
Agent, to the Registered Holders at each Registered Holder's address appearing
in the Warrant register, by first class-mail, postage prepaid, mailed sixty (60)
days prior to the Redemption Date.

      All the notices of redemption shall state in reasonable detail:

      (1)  the date fixed for redemption of the Warrants (the "Redemption 
Date");

      (2)  the Redemption Price;

      (3)  that on the Redemption Date, the Redemption Price will become due and
payable upon each Warrant;

      (4)  the Purchase Price, the date on which the right to exercise the 
Warrants will terminate and the place or places where the Warrants may be 
exercised;

      (5)  the place or places where the Warrants are to be surrendered for 
payment of the Redemption Price.

      (d) On or before the Redemption Date, the Company shall deposit with the
Warrant Agent (or if the Company is acting as its own paying agent, in a
segregated, trust account or at the Company's option with a paying agent
authorized by the Company to pay the Redemption Price on behalf of the Company),
an amount of money sufficient to pay the Redemption Price of all the Warrants to
be redeemed on the Redemption Date other than any Warrants which have been
exercised prior to the date of deposit.

      If any Warrant called for redemption is exercised on or prior to the 
Redemption Date, any money deposited with the Warrant Agent (or any 
aforementioned paying agent) shall be paid to the Company upon written request
stating the reasons therefor. 

                                      13





<PAGE>
 
         (e)  Notice of redemption having been given as aforesaid, the Warrants 
so to be redeemed shall, on the Redemption Date, become due and payable at the 
Redemption Price and at the place or places therein specified. Upon surrender of
each such Warrant for redemption in accordance with said notice, such Warrant 
shall be paid by the Company at the Redemption Price.

              If any Warrant called for redemption shall not be so paid upon 
surrender therefor, the Redemption Price shall, until paid, bear interest 
compounded daily from the Redemption Date at the maximum rate permitted by 
applicable law not to exceed 18% per annum.

         SECTION 10.    Fractional Warrants and Fractional Shares.
                        -----------------------------------------

         (a)  If the number of shares of Common Stock purchasable upon the 
exercise of each Warrant is adjusted pursuant to Section 8 hereof, the Company 
shall nevertheless not be required to issue fractions of shares, upon exercise 
of the Warrants or otherwise, or to distribute certificates that evidence 
fractional shares. With respect to any fraction of a share called for upon any 
exercise hereof, the Company shall pay to the Holder an amount in cash equal to 
such fraction multiplied by the current market value of such fractional share, 
determined as follows:

              (1)  If the Common Stock is listed on a national securities
         exchange or admitted to unlisted trading privileges on such exchange or
         listed for trading on the Nasdaq National Market System ("NMS"), the
         current market value shall be the last reported sale price of the
         Common Stock on such exchange on the last business day prior to the
         date of exercise of this Warrant or if no such sale is made on such day
         or no closing sale price is quoted, the average of the closing bid and
         asked prices for such day on such exchange or system; or

              (2)  If the Common Stock is listed in the over-the-counter market
         (other than on NMS) or admitted to unlisted trading privileges, the
         current market value shall be the mean of the last reported bid and
         asked prices reported by the National Quotation Bureau, Inc. on the
         last business day prior to the date of the exercise of this Warrant; or

              (3)  If the Common Stock is not so listed or admitted to unlisted
         trading privileges and bid and asked prices are not so reported, the
         current market value shall be prescribed by the Board of Directors of
         the Company.

         SECTION 11.    Warrantholders Not Deemed Stockholders. No holder of
                        -------------------------------------- 
Warrants shall, as such, be entitled to vote or to receive dividends or be
deemed the holder of Common Stock that may at any time be issuable upon exercise
of such Warrants for any purpose whatsoever, nor shall anything contained herein
be construed to confer upon the holder of Warrants, as such, any of the rights
of a stockholder of the Company or any right to vote for the election of
directors or upon any matter submitted to stockholders at any

                                      14
<PAGE>
 
meeting thereof, or to give or withhold consent to any corporate action 
(whether upon any recapitalization, issue or reclassification of stock, change 
of par value or change of stock to no par value, consolidation, merger or 
conveyance or otherwise), or to receive notice of meetings, or to receive 
dividends or subscription rights, until such Holder shall have exercised such 
Warrants and been issued shares of Common Stock in accordance with the 
provisions hereof.

      SECTION 12.  Rights of Action.  All rights of action with respect to this 
Agreement are vested in the respective Registered Holders of the Warrants, and 
any Registered Holder of a Warrant, without consent of the Warrant Agent or of 
the holder of any other Warrant, may, on his own behalf and for his own benefit,
enforce against the Company his right to exercise his Warrants for the purchase 
of shares of Common Stock in the manner provided in the Warrant Certificate 
and this Agreement.

      SECTION 13.  Agreement of Warrantholders.  Every holder of a Warrant, by 
his acceptance thereof, consents and agrees with the Company, the Warrant Agent 
and every other holder of a Warrant that:

      (a) The Warrants are transferable only on the registry books of the
Warrant Agent by the Registered Holder thereof in person or by his attorney duly
authorized in writing and only if the Warrant Certificates representing such
Warrants are surrendered at the office of the Warrant Agent, duly endorsed or
accompanied by a proper instrument of transfer satisfactory to the Warrant Agent
and the Company in their sole discretion, together with payment of any
applicable transfer taxes; and

      (b)  The Company may deem and treat the person in whose name the Warrant 
Certificate is registered as the holder and as the absolute, true and lawful 
owner of the Warrants represented thereby for all purposes, and the Company 
shall not be affected by any notice or knowledge to the contrary, except as 
otherwise expressly provided in Section 7 hereof.

      SECTION 14.  Cancellation of Warrant Certificates. If the Company shall 
purchase or acquire any Warrant or Warrants, the Warrant Certificate or Warrant 
Certificates evidencing the same shall thereupon be cancelled by it and retired.
The Warrant Agent shall also cancel Common Stock following exercise of any or 
all of the Warrants represented thereby or delivered to it for transfer, split 
up, combination or exchange.

      SECTION 15. Concerning the Warrant Agent. The Warrant Agent acts hereunder
as agent and in a ministerial capacity for the Company, and its duties shall be
determined solely by the provisions hereof. The Warrant Agent shall not, by
issuing and delivering Warrant Certificates or by any other act hereunder be
deemed to make any representations as to the validity, value or authorization of
the Warrant Certificates or the Warrants represented thereby or of any
securities or other property delivered upon exercise


                                      15
<PAGE>
 
of any Warrant or whether any stock issued upon exercise of any Warrant is fully
paid and nonassessable.

              The Warrant Agent shall account promptly to the Company with 
respect to Warrants exercised and concurrently pay the Company, as provided in 
Section 4, all moneys received by the Warrant Agent upon the exercise of such 
Warrants. The Warrant Agent shall, upon request of the Company from time to 
time, deliver to the Company such complete reports of registered ownership of 
the Warrants and such complete records of transactions with respect to the 
Warrants and the shares of Common Stock as the Company may request. The Warrant 
Agent shall also make available to the Company and Paramount for inspection by 
their agents or employees, from time to time as either of them may request, such
original books of accounts and record (including original Warrant Certificates 
surrendered to the Warrant Agent upon exercise of Warrants) as may be maintained
by the Warrant Agent in connection with the issuance and exercise of Warrants 
hereunder, such inspections to occur at the Warrant Agent's office as specified 
in Section 17, during normal business hours.

              The Warrant Agent shall not at any time be under any duty or 
responsibility to any holder of Warrant Certificates to make or cause to be made
any adjustment of the Purchase Price provided in this Agreement, or to determine
whether any fact exists which may require any such adjustments, or with respect 
to the nature or extent of any such adjustment, when made, or with respect to 
the method employed in making the same. It shall not (i) be liable for any 
recital or statement of facts contained herein or for any action taken, suffered
or omitted by it in reliance on any Warrant Certificate or other document or 
instrument believed by it in good faith to be genuine and to have been signed or
presented by the proper party or parties, (ii) be responsible for any failure on
the part of the Company to comply with any of its covenants and obligations 
contained in this Agreement or in any Warrant Certificate, or (iii) be liable 
for any act or omission in connection with this Agreement except for its own 
negligence or wilful misconduct.

              The Warrant Agent may at any time consult with counsel 
satisfactory to it (who may be counsel for the Company) and shall incur no 
liability or responsibility for any action taken, suffered or omitted by it in 
good faith in accordance with the written opinion or advice of such counsel.

              Any notice, statement, instruction, request, direction, order or 
demand of the Company shall be sufficiently evidenced by an instrument signed by
the Chairman of the Board, President, any Vice President, its Secretary, or 
Assistant Secretary, (unless other evidence in respect thereof is herein 
specifically prescribed). The Warrant Agent shall not be liable for any action 
taken, suffered or omitted by it in accordance with such notice, statement, 
instruction, request, direction, order or demand believed by it to be genuine.

              The Company agrees to pay the Warrant Agent reasonable 
compensation for its services hereunder and to reimburse it for its reasonable 
expenses hereunder; it further

                                      16
<PAGE>
 
agrees to indemnify the Warrant Agent and save it harmless against any and all 
losses, expenses and liabilities, including judgments, costs and counsel fees, 
for anything done or omitted by the Warrant Agent in the execution of its duties
and powers hereunder except losses, expenses and liabilities arising as a result
of the Warrant Agent's negligence or wilful misconduct.

      The Warrant Agent may resign its duties and be discharged from all further
duties and liabilities hereunder (except liabilities arising as a result of the
Warrant Agent's own negligence or wilful misconduct), after giving 30 days'
prior written notice to the Company. At least 15 days prior to the date such
resignation is to become effective, the Warrant Agent shall cause a copy of such
notice of residnation to be mailed to the Registered Holder of each Warrant
Certificate at the Company's expense. Upon such resignation, or any inability of
the Warrant Agent to act as such hereunder, the Company shall appoint a new
warrant agent in writing. If the Company shall fail to make such appointment
within a period of 15 days after it has been notified in writing of such
resignation by the resigning Warrant Agent, then the Registered Holder of any
Warrant Certificate may apply to any court of competent jurisdiction for the
appointment of a new warrant agent. Any new warrant agent, whether appointed by
the Company or by such a court, shall be a bank or trust company having a
capital and surplus, as shown by its last published report to its stockholders,
of not less than $10,000,000 or a stock transfer company. After acceptance in
writing of such appointment by the new warrant agent is received by the Company,
such new warrant agent shall be vested with the same powers, rights, duties and
responsibilities as if it had been originally named herein as the Warrant Agent,
without any further assurance, conveyance, act or deed; but if for any reason it
shall be necessary or expedient to execute and deliver any further assurance,
conveyance, act or deed, the same shall be done at the expense of the Company
and shall by legally and validly executed and delivered by the resigning Warrant
Agent. Not later than the effective date of any such appointment the Company
shall file notice thereof with the resigning Warrant Agent and shall forthwith
cause a copy of such notice to be mailed to the Registered Holder of each
Warrant Certificate.

      Any corporation into which the Warrant Agent or any new warrant agent may 
be converted or merged or any corporation resulting from any consolidation to 
which the Warrant Agent or any new warrant agent shall be a party or any 
corporation succeeding to the trust business of the Warrant Agent shall be a 
successor warrant agent under this Agreement without any further act, provided 
that such corporation is eligible for appointment as successor to the Warrant 
Agent under the provisions of the preceding paragraph.  Any such successor 
warrant agent shall promptly cause notice of its succession as warrant agent to 
be mailed to the Company and to the Registered Holder of each Warrant 
Certificate.

      The Warrant Agent, its subsidiaries and affiliates, and any of its or 
their officers or directors, may buy and hold or sell Warrants or other 
securities of the Company and otherwise deal with the Company in the same manner
and to the same extent and with like effects as though it were not Warrant 
Agent.  Nothing herein shall preclude the Warrant Agent from acting in any other
capacity for the Company or for any other legal entity.

                                      17
<PAGE>
 
              SECTION 16.    Modification of Agreement. The parties hereto may 
                             -------------------------
by supplemental agreement make any changes or corrections in this Agreement (i) 
that it shall deem appropriate to cure any ambiguity or to correct any defective
or inconsistent provision or manifest mistake or error herein contained; (ii) to
reflect an increase in the number of Warrants which are to be governed by this 
Agreement resulting from an increase in the size of the Private Placement; or 
(iii) that it may deem necessary or desirable and which shall not adversely 
affect the interests of the holders of Warrant Certificates; provided however,
                                                             ----------------
that this Agreement shall not otherwise be modified, supplemented or altered in 
any respect except with the consent in writing of the Registered Holders of 
Warrant Certificates representing not less than 50% of the Warrants then 
outstanding; and provided, further, that no change in the number or nature of
                 -----------------
the securities purchasable upon the exercise of any Warrant, or the Purchase 
Price therefor, or the acceleration of the Warrant Expiration Date, shall be 
made without the consent in writing of the Registered Holder of the Warrant 
Certificate representing such Warrant, other than such changes as are 
specifically prescribed by this Agreement as originally executed.

              SECTION 17.    Notices. All notices, requests, consents and other
                             ------- 
communications hereunder shall be in writing and shall be deemed to have been
made when delivered or mailed first class registered or certified mail, postage
prepaid as follows: if to the Registered Holder of a Warrant Certificate, at the
address of such holder as shown on the registry books maintained by the Warrant
Agent; if to the Company, at Reservoir Place, 1601 Trapelo Road, Waltham, MA,
02154, if to the Warrant Agent, at J.A.F. Building, P.O. Box 3068, New York, NY,
10116-3068 and if to Paramount, at 375 Park Avenue, 15th Floor, New York, New
York 10152. Attention: Michael S. Weiss.

              SECTION 18.    Governing Law. This Agreement shall be governed by
                             -------------
and construed in accordance with the laws of the State of New York, without 
reference to its principles of conflict of laws.

              SECTION 19.    Binding Effect. This Agreement shall be binding 
                             --------------
upon and inure to the benefit of the Company and the Warrant Agent (and their 
respective successors and assigns) and the holders from time to time of Warrant 
Certificates. Nothing in this Agreement is intended or shall be construed to 
confer upon any other person any right, remedy or claim, in equity or at law, or
to impose upon any other person any duty, liability or obligation.

              SECTION 20.    Termination. This Agreement shall terminate on the
                             ----------- 
earlier to occur of (i) the close of business on the Expiration Date of all the 
Warrants; (ii) the date upon which all Warrants have been exercised.

              SECTION 21.    Counterparts. This Agreement may be executed in
                             ------------
several counterparts, which taken together shall constitute a single document.

                                      18

<PAGE>
 

      IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be 
duly executed as of the date first above written.


                                        BOSTON LIFE SCIENCES, INC.


                                        By:
                                            ------------------------------
                                             Name:
                                             Title:


                                        PARAMOUNT CAPITAL, INC.,


                                        By: 
                                            ------------------------------ 
                                             Name:
                                             Title:


                                        [                                ]


                                        By: 
                                            ------------------------------
                                             Name:
                                             Title:

                                      19


<PAGE>
 
THIS WARRANT AND ANY SHARES OF COMMON STOCK ISSUABLE UPON ITS EXERCISE HAVE NOT 
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE "ACT") AND MAY NOT BE 
TRANSFERRED UNTIL (1) A REGISTRATION STATEMENT UNDER THE ACT SHALL HAVE BECOME 
EFFECTIVE WITH RESPECT THERETO, OR (2) RECEIPT BY THE ISSUER OF AN OPINION OF 
COUNSEL REASONABLE SATISFACTORY TO THE ISSUER TO THE EFFECT THAT REGISTRATION 
UNDER THE ACT IS NOT REQUIRED IN CONNECTION WITH SUCH PROPOSED TRANSFER NOR IS 
SUCH TRANSFER IN VIOLATION OF ANY APPLICABLE STATE SECURITIES LAWS.

No.  Warrants



                               VOID AFTER [ ], 2005

                        WARRANT CERTIFICATE FOR PURCHASE
                                 OF COMMON STOCK

                            BOSTON LIFE SCIENCES, INC.

      This certifies that FOR VALUE RECEIVED __________________________________
___________________________ or registered assigns (the "Registered Holder") is 
the owner of the number of Warrants ("Warrants") specified above. Each Warrant
initially entitles the Registered Holder to purchase, subject to the terms and
conditions set forth in this Certificate and the Warrant Agreement (as
hereinafter defined), one fully paid and nonassessable share of Common Stock,
$.02 par value ("Common Stock"), of BOSTON LIFE SCIENCES, INC., a Delaware
Corporation (the "Company"), at any time commencing [ ], 1995 and prior to the
Expiration Date (the "Company"), at any time commencing [ ], 1995 and prior to
the Expiration (as hereinafter defined), upon the presentation and surrender of
this Warrant Certificate with the Subscription Form on the reverse hereof duly
executed, at the corporate office of, as Warrant Agent, or its successor (the
"Warrant Agent"), accompanied by payment of an amount equal to the lesser of (a)
$1.00 per share and (b) the average closing bid price of the Common Stock of
Nasdaq for the thirty consecutive trading days immediately preceding the Closing
Date on which such Warrants are issued (the "Purchase Price") in lawful money of
the United States of America in cash or by official bank or certified check made
payable to Boston Life Sciences, Inc. The Company may, at its election, reduce
the Purchase Price.

      This Warrant Certificate and each Warrant represented hereby are issued 
pursuant to and are subject in all respects to the terms and conditions set 
forth in the Warrant Agreement (the "Warrant Agreement"), dated September ___, 
1995 by and among the Company, the Warrant Agent and Paramount Capital, Inc.

                                       1

<PAGE>
 
              In the event of certain contingencies provided for in the Warrant 
Agreement, the Purchase Price or the number of shares of Common Stock subject to
purchase upon the exercise of each Warrant represented hereby are subject to 
modification or adjustment.

              Each Warrant represented hereby is exercisable at the option of 
the Registered Holder, but no fractional shares of Common Stock will be issued. 
In the case of the exercise of less than all the Warrants represented hereby, 
the Company shall cancel this Warrant Certificate upon the surrender hereof and 
shall execute and deliver a new Warrant Certificate or Warrant Certificates of 
like tenor, which the Warrant Agent shall countersign, for the balance of such 
Warrants.

              The term "Expiration Date" shall mean 5:00 P.M. (New York time)
on [  ], 2005. If such date shall in the State of New York be a holiday or a day
on which the banks are authorized to close, then the Expiration Date shall mean
5:00 P.M. (New York time) the next following day which in the State of New York
is not a holiday or a day on which banks are authorized to close. The Company
may, at its election, extend the Expiration Date.

              The Warrant is not redeemable at the option of the company prior 
to [   ], 1996. The Warrants may be redeemed at the election of the Company, in 
whole but not in part, at any time on or after [   ], 1996, at $.10 per Warrant 
(the "Redemption Price") provided that either (i) the closing bid quotation for 
the Common Stock as reported on Nasdaq, or on such other exchange on which the 
Common Stock is then traded, exceeds 200% of the Purchase Price for twenty (20) 
consecutive trading days ending three days prior to the date of redemption.

              This Warrant Certificate is exchangeable, upon the surrender 
hereof by the Registered Holder at the corporate office of the Warrant Agent, 
for a new Warrant Certificate or Warrant Certificates of like tenor representing
an equal aggregate number of Warrants, each of such new Warrant Certificates to 
represent such number of Warrants as shall be designated by such Registered 
Holder at the time of such surrender. Upon due presentment with any tax or other
governmental charge imposed in connection therewith, for registration of 
transfer of this Warrant Certificate at such office, a new Warrant Certificate 
or Warrant Certificates representing an equal aggregate number of Warrants will 
be issued to the transferee in exchange therefor, subject to the limitations 
provided in the Warrant Agreement.

              Prior to the exercise of any Warrant represented hereby, the 
Registered Holder shall not be entitled to any limitation, the right to vote or 
to receive dividends or other distributions, and shall not be entitled to 
received any notice of any proceedings of the Company, except as provided in the
Warrant Agreement.

              Prior to due presentment for registration of transfer hereof, the 
Company may deem and treat the Registered Holder as the absolute owner hereof 
and of each Warrant

                                       2
<PAGE>
 

represented hereby (notwithstanding any notations of ownership or writing hereon
made by anyone other than a duly authorized officer of the Company) for all
purposes and shall not be affected by any notice of the contrary.

      This Warrant Certificate shall be governed by and construed in accordance 
with the laws of the State of New York without reference to its principles of 
conflict of laws.

      IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be 
duly executed, manually or in facsimile by two of its officers thereunto duly 
authorized and a facsimile of its corporate seal to be imprinted hereon.


                                        BOSTON LIFE SCIENCES, INC.

Dated: [  ], 1995
                                        By _______________________________
                                                Name: S. David Hillson
                                                Title: President

[seal]
                                           _______________________________
                                                Name: Steve H. Kanzer
                                                Title: Secretary


                                        [                                ]


                                        By _______________________________
                                                Name:
                                                Title:
<PAGE>
 

SUBSCRIPTION FORM

To Be Executed by the Registered Holder
in Order to Exercise Warrants


      The undersigned Registered Holder hereby irrevocably elects to exercise 
_____________ Warrants represented by this Warrant Certificate, and to purchase 
the securities issuable upon the exercise of such Warrants, and requests that 
certificates for such securities shall be issued in the name of

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER    





[please print or type name and address]


and be delivered to







[please print or type name and address]



and if such number of Warrants shall not be all the Warrants evidenced by this 
Warrant Certificate, that a new Warrant Certificate for the balance of such 
Warrants be registered in the name of, and delivered to, the Registered Holder 
at the address stated below.

                                       4

<PAGE>
 
     The undersigned represents that the exercise of the within Warrant was 
solicited by a member of the National Association of Securities Dealers, Inc.  
If not solicited by an NASD member, please write "unsolicited" in the space 
below.  Unless otherwise indicated by listing the name of another NASD member 
firm, it will be assumed that the exercise was solicited by Paramount Capital, 
Inc.

                                                                                
                                                
                                           -------------------------------------
                                            (Name of NASD Member if other
                                            than Paramount Capital, Inc.)


Dated:_________

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

                                           -------------------------------------
                                            
                                           -------------------------------------
                                           Address


                                             
                                           -------------------------------------
                                           Taxpayer Identification Number


- ------------------------
Signature Guaranteed


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





































                                       5
<PAGE>
 
ASSIGNMENT


To Be Executed by the Registered Holder 
in Order to Assign Warrants


FOR VALUE RECEIVED,                  hereby sell, assigns and transfers unto



PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER




[please print or type name and address]


            of the Warrants represented by this Warrant Certificate, and hereby 
irrevocably constitutes and appoints
                                          Attorney to transfer this Warrant 
Certificate on the books of the Company, with full power of substitution in the 
premises.  


Dated:
X

Signature Guaranteed




THE SIGNATURE TO THE ASSIGNMENT OR THE SUBSCRIPTION FORM MUST CORRESPOND TO THE 
NAME AS WRITTEN UPON THE FACE OF THIS WARRANT CERTIFICATE IN EVERY PARTICULAR, 
WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER, AND MUST BE 
GUARANTEED BY A COMMERCIAL BANK OR TRUST COMPANY OR A MEMBER FIRM OF THE 
AMERICAN STOCK EXCHANGE, NEW YORK STOCK EXCHANGE, PACIFIC STOCK EXCHANGE OR 
MIDWEST STOCK EXCHANGE.


                                       6



















































<PAGE>
 
             [Letterhead of Price Waterhouse L.L.P. Appears Here]

                                 EXHIBIT 23.2

                      Consent of Independent Accountants


We hereby consent to the incorporation by reference in the Prospectus 
constituting part of this Registration Statement on Form S-3 of our report dated
March 4, 1996, which appears on page FS-2 of Boston Life Sciences, Inc's Annual 
Report on Form 10-K for the year ended December 31, 1995.  We also consent to 
the reference to us under the heading "Experts" in such Prospectus.

/s/ Price Waterhouse LLP

PRICE WATERHOUSE LLP

Boston, Massachusetts
May 10, 1996

<PAGE>
 
                                 EXHIBIT 23.3



INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
Boston Life Sciences, Inc. on Form S-3 of the report of Deloitte & Touche LLP
dated January 31, 1989 with respect to the statements of operations,
stockholders' equity and cash flows of Greenwich Pharmaceuticals Incorporated
(the "Company") for the period of inception (February 1969) to December 31, 1988
appearing in the Annual Report on Form 10-K/A of Greenwich Pharmaceuticals
Incorporated for the year ended December 31, 1994, as amended by Form 10-K/A.
Such report contains an explanatory paragraph that states that the ultimate
success of the Company's development program is dependent upon future events,
the outcome of which is currently undeterminable, and is also dependent upon
obtaining financing adequate to fulfill its development activities and achieving
a level of revenues adequate to support the Company's cost structure. We also
consent to the reference to us under the headings "Experts" in such prospectus.


/s/ DELOITTE & TOUCHE LLP

DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania
May 10, 1996

<PAGE>
 
                              ARTHUR ANDERSEN LLP

                                 EXHIBIT 23.4


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
                   -----------------------------------------


As independent public accountants, we hereby consent to the incorporation by 
reference in the Boston Life Sciences, Inc. Amendment No. 1 to Form S-3 
Registration Statement of our report dated February 24, 1995 (except with 
respect to the matters discussed in Note 12, as to which the date is June 15, 
1995) included in the Greenwich Pharmaceuticals Incorporated's Form 10-K, as 
amended, for the three years in the period ended December 31, 1994 and to all 
references to our Firm included in this registration.

                                                     /s/ Arthur Andersen LLP

Philadelphia, PA
  May 10, 1996


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