BOSTON LIFE SCIENCES INC /DE
S-3/A, 1999-11-24
PHARMACEUTICAL PREPARATIONS
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<PAGE>


   As filed with the Securities and Exchange Commission on November 24, 1999
                                                      Registration No. 333-89159
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION

                              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 its charter)

              Delaware                                 87-0277826
   (State or other jurisdiction of         (I.R.S. Employer Identification No.)
   incorporation or organization)

                              137 Newbury Street
                                   8th Floor
                          Boston, Massachusetts 02116
                                 (617) 425-0200
  (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.
                              137 Newbury Street
                                   8th Floor
                          Boston, Massachusetts 02116
                                 (617) 425-0200
 (Name, address, including zip code, and telephone number, Including area code,
                             of agent for service)

                                   Copies to:
                               Steven A. Wilcox
                                 Ropes & Gray
                            One International Place
                             Boston, MA 02110-2624
                                (617) 951-7000

   Approximate date of commencement of proposed sale to the public: From time to
time 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]

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

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

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






   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 this registration statement shall become
effective on such date as the Commission, acting pursuant to Section 8(a), may
determine.

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

<PAGE>


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ The information in this prospectus is not complete and may be changed. We  +
+ may sell these securities until the registration statement filed with the  +
+ Securities and Exchange Commission is effective. This prospectus is not an +
+ offer to buy these securities in any State where the offer or sale is not  +
+ permitted.                                                                 +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                 SUBJECT TO COMPLETION DATED NOVEMBER 24, 1999

PROSPECTUS

                               4,456,572 Shares

                          Boston Life Sciences, Inc.

                                 Common Stock

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

  These shares are being offered for sale by the selling stockholders listed on
page 12. The selling stockholders may sell the common stock at prices and on
terms determined by the market, in negotiated transactions or through
underwriters. The selling stockholders may also sell the common stock under Rule
144 of the Securities Act of 1933.

  The common stock is traded on the Nasdaq SmallCap Market under the symbol
"BLSI". On November 22, 1999, the reported closing price of the common stock was
$4.438 per share.

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

  An investment in the shares offered hereby involves a high degree of risk.
See "Risk Factors" beginning on page 4 of this prospectus.

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

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is
a criminal offense.


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

                 The date of this prospectus is November __, 1999.

<PAGE>

                               TABLE OF CONTENTS

                                                                            Page
                                                                            ----
SUMMARY..................................................................   3
RISK FACTORS.............................................................   4
USE OF PROCEEDS..........................................................  10
ISSUANCE OF CONVERTIBLE DEBENTUERS AND WARRANTS TO SELLING SHAREHOLDERS..  11
SELLING STOCKHOLDERS.....................................................  11
PLAN OF DISTRIBUTION.....................................................  13
THE COMPANY..............................................................  14
DESCRIPTION OF SECURITIES TO BE REGISTERED...............................  15
LEGAL MATTERS............................................................  15
EXPERTS..................................................................  15
AVAILABLE INFORMATION....................................................  16
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE..........................  16


                                       2
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                                    SUMMARY

   Boston Life Sciences, Inc. 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, central nervous
system (CNS) disorders and autoimmune diseases. Products awaiting FDA review, in
clinical trials or in preclinical development by BLSI include Therafectin(R) for
the treatment of Rheumatoid Arthritis; Troponin I, an anti-angiogenic factor for
the treatment of solid tumor metastases; Altropane(TM), a radioimaging agent for
the diagnosis of Parkinson's Disease and Attention Deficit Hyperactivity
Disorder (ADHD); AF-1 for the potential treatment of stroke and spinal cord
injury; fusion toxins for the treatment of adenocarcinomas, allergies, and
multiple sclerosis and transcription factors that may control the expression of
molecules associated with autoimmune disease and allergies. Therafectin was
acquired as a result of our June 1995 merger with Greenwich Pharmaceuticals,
Inc. The balance of our technologies currently under development were invented
or discovered by researchers working at Harvard University and its affiliated
hospitals and have been licensed to us. Our principal executive offices are
located at 137 Newbury Street, 8th Floor, Boston, Massachusetts 02116, and the
telephone number is (617) 425-0200.

   In general, our corporate strategy is to seek to:

  . fund the early development of our compounds in preclinical development,
    and

  . enter into corporate partnering arrangements with established
    pharmaceutical or biotechnology companies to support the continued
    development of our compounds and the marketing of any resulting products
    if they receive government approval.

   Additionally, since we do not currently own any laboratory or manufacturing
facilities, we contract for such services and intend to continue to do so.


                                       3
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                                 RISK FACTORS

   Investing in our common stock is very risky. You should be able to bear a
complete loss of your investment. This prospectus, including the documents
incorporated by reference, contains forward-looking statements that involve
risks or uncertainties. Actual events or results may differ materially from
those discussed in this prospectus. Factors that could cause or contribute to
such differences include the factors discussed below as well as those
discussed elsewhere in this prospectus and in our filings with the Securities
and Exchange Commission.

 We are a development stage company, we have always had losses from our
 operations and we expect future losses.

   We are a development stage company and have always had losses from our
operations. We have never generated revenues from product sales and we do not
currently expect to generate revenues from product sales for at least the next
eighteen months, and probably longer. There can be no guarantee that we will
ever generate revenues or operating profits, or that if we do generate
revenues or operating profits, that we will be able to continue to do so.

   As of September 30, 1999, we have incurred total net losses since inception
of approximately $45 million. To date, we have dedicated most of our financial
resources to the research and development of our product candidates, preclinical
compounds, and other technologies (which we collectively refer to in this
prospectus as our "technologies"), general and administrative expenses and costs
related to obtaining and protecting patents. We expect to incur significant
operating losses for at least the next eighteen months, and probably longer, and
to generate little if any revenue from product sales during that time, primarily
due to the continued expenditures necessary to support progress of our research
and development programs, including preclinical studies and clinical trials, and
costs associated with making and selling our products.

   Our ability to generate revenue and operating income in the future will
depend on many factors including:

  . Successfully completing the research and development of our
technologies;

  . Protecting our patent and other intellectual rights, as well as the
    ability of our licensors and collaborators to protect their patent and
    other intellectual rights;

  . The time, cost, and effort required to obtain regulatory approvals;

  . Establishing collaborative arrangements for manufacturing, sales and
    marketing capabilities for any of our products;

  . Competing technologies and market developments; and

  . Manufacturing costs and the market acceptance of our products at prices
    sufficient to generate adequate profits.

   If we require additional funding in the future but are unable to secure
such funding on acceptable terms, we may need to significantly reduce or even
cease one or more of our research or development programs, or we may be
required to obtain funds through arrangements with others that may require us
to surrender rights to some or all of our technologies.

   We spend a significant amount for research and development, including
preclinical studies and clinical trials of our technologies. We expect that
our current cash, cash equivalents and investment balances will be sufficient
to fund our capital requirements through at least the next eighteen months.
Thereafter, we may need to raise substantial additional capital if we are
unable to generate sufficient revenue from product sales or through
collaborative arrangements with third parties. To date, we have always
experienced negative cash flows

                                       4
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from operations and have funded our operations primarily from equity
financings. If adequate funds are not readily available, we may need to
significantly reduce or even cease one or more of our research or development
programs. Alternatively, to secure such funds, we may be required to enter
financing arrangements with others that may require us to surrender rights to
some or all of our technologies. If the results of our current or future
clinical trials are not favorable, it may negatively affect our ability to
raise additional funds. If we are successful in obtaining additional equity
financing, the terms of such financing will have the effect of diluting the
holdings and the rights of our common stockholders.

   Our capital requirements will depend on many factors, including:

  . The progress of our research and development activities and our clinical
    trials, and the degree to which we encounter the problems, delays, and
    other complications frequently experienced by development stage
    biotechnology companies.

  . Our ability to meet the terms of any current collaborative research,
    manufacturing, marketing or other agreements, and to successfully
    negotiate economically feasible and meet the terms of future agreements.

  . The cost and timing of, and success in, obtaining FDA and other
    regulatory approvals of our products;

  . The cost of protecting our patent claims and other intellectual property
    rights; and

  . Changes in economic, regulatory or competitive conditions of the
    pharmaceutical and biotechnology industry.

   Estimates about how much funding will be required are based on a number of
assumptions, all of which are subject to change based on the results and
progress of our research and development activities.

If we are unable to secure adequate patent protection for our technologies, then
we may not be able to compete effectively as a biotechnology company.

   At the present time, we do not have patent protection for all uses of our
technologies. There is significant competition in the Company's primary
scientific areas of research and development including arthritis, cancer, and
autoimmune diseases and allergies. Such competitors will seek patent protection
for their technologies and such patent applications or rights might conflict
with or infringe upon the patent protection coverage that we are seeking for
our technologies. If we do not obtain patent protection for our technologies,
our ability to compete and business prospects may be significantly and
negatively affected. Further, even if patents can be obtained, there can be no
guarantee that these patents will provide us with any competitive advantage.

   Our patent strategy is to pursue patent protection, in the U.S. and in most
developed countries, for our technologies. Our goal is to obtain broad patent
protection for our technologies and their related medical indications. The
patent application and issuance process generally takes several years and is
usually very expensive without any guarantee that a patent will be issued. In
many cases, our know-how and technology may not be patentable. Risks associated
with protecting our patent and proprietary rights include the following:

  . Our ability to protect our technologies could be delayed or negatively
    affected if the United States Patent and Trademark Office (the "USPTO")
    requires clinical evidence that our technologies work.

  . Our competitors may develop similar technologies or products, or
    duplicate any technology developed by us.

  . If patents are issued to us, our competitors may develop products which
    are similar to ours but which do not infringe on our patents or products,
    or a third party may successfully challenge one or more of our patents.

                                       5
<PAGE>


  . Our patents may infringe on the patents or rights of other parties which
    may decide not to grant a license to us. We may have to change our
    products or processes, pay licensing fees or stop certain activities
    because of the patent rights of third parties which could cause
    additional unexpected costs and delays.

  . Patent law in the fields of healthcare and biotechnology is still
    evolving. Future changes in patent laws might conflict with our existing
    or future patent rights, or the rights of others.

  . We also rely on trade secrets and proprietary know-how. We seek to
    protect this information primarily through confidentiality agreements
    with our collaborators, employees and consultants, but there can be no
    guarantee that these agreements will not be breached or that we will have
    adequate remedies for such breach.

  . If consultants, scientific advisors, or other third parties apply
    technological information which they have developed separate from us to
    our technologies, there may be disputes as to the ownership of such
    information which may not be resolved in our favor.

   If we are unable to maintain our key working relationships with Harvard
University and its affiliates, we may not be successful since substantially all
of our current technologies were licensed from, and most of our research and
development activities were performed by, Harvard University and its affiliates.

   Most biotechnology and pharmaceutical companies have established internal
research and development programs, including their own facilities and employees
which are under their direct control. By contrast, we have always outsourced
all of our research and development, preclinical and clinical activities.
Specifically, we have been heavily dependent on one such relationship because
substantially all of our technologies were licensed from, and most of our
research and development activities were performed by, Harvard University and
its affiliates. Now that most of our early-stage research at Harvard has
yielded an identified product in each area of research, we have begun and
expect to continue to conduct much of our later stage development work and all
of our formal preclinical and clinical programs outside of Harvard.
Nevertheless, the originating scientists still play important advisory roles.

   Universities and other not-for-profit research institutions are becoming
increasingly aware of the commercial value of their findings and are becoming
more active in seeking patent protection and licensing arrangements to collect
royalties for the use of technology that they have developed. Currently, an
important aspect of future new product identification and early development is
likely to depend upon:

  . Our ability to obtain and maintain licenses for new technologies from
    Harvard and its affiliates; and

  . Harvard and its affiliates continuing to perform early-stage research and
    development work under sponsored research agreements with us.

   There can be no guarantee that we will be able to obtain new technologies
from Harvard and its affiliates or that we can continue to meet our obligations
under existing arrangements.

   If we are unable to retain our key personnel and/or recruit additional key
personnel in the future, then we any not be able to operate effectively.

   Our success depends significantly upon our ability to attract and retain
highly qualified scientific and management personnel who are able to formulate,
implement and maintain the operations of a biotechnology company such as ours.
As an example, Marc E. Lanser, our Chief Scientific Officer, was formerly on
the staff of, and maintains close affiliations with Harvard Medical School and
its affiliates. Substantially all of our technologies were licensed from
Harvard. Our past ability to secure these licenses and to enter into sponsored
research and development agreements with Harvard was enhanced by Dr. Lanser's
affiliations and familiarity with the Harvard Medical School and its
affiliates.


                                       6
<PAGE>


   We currently outsource all our research and development, preclinical and
clinical activities. If we decide to undertake internally the research and
development of any of our technologies, we may need to hire additional key
management and scientific personnel to assist the limited number of employees
that we currently employ. There is significant competition for such personnel
from other companies, research and academic institutions, government entities
and other organizations. If we fail to attract such personnel, it could have a
significant negative effect on our ability to develop our technologies. There
can be no guarantee that we will be successful in hiring or retaining the
personnel that may be required for such activities in the future.

   If we are unable to establish, maintain and rely on new collaborative
relationships, then we may not be able to sucessfully develop and commercialize
our technologies.

   To date, our operations have primarily focused on the pre-clinical
development of most of our technologies, as well as the completion of clinical
trials for two of our technologies. During the next eighteen months, we
currently expect that the continued development of our technologies will result
in the initiation of additional clinical trials, and if regulatory approval is
obtained, the market introductions of the two technologies for which clinical
trials are currently in process or have been completed. We expect that these
developments will require us to establish, maintain and rely on new
collaborative relationships in order to successfully develop and commercialize
our technologies. There is no certainty that:

  . We will be able to enter into such collaborations on economically
    feasible and otherwise acceptable terms and conditions.

  . That such collaborations will not require us to undertake substantial
    additional obligations or may require us to devote additional resources
    beyond those we have identified at present.

  . That any of our collaborators will not breach or terminate their
    agreement with us or otherwise fail to conduct their activities on time,
    thereby delaying the development or commercialization of the technology
    for which the parties are collaborating.

  . The parties will not dispute the ownership rights to any, technologies
    developed under such collaborations.


   If we are not able to establish or maintain the necessary collaborative
arrangements, we will need more money to research and develop technologies on
our own and we may encounter delays in introducing our products.

   If the current environment of rapid technological change requires
significantly greater financial, technical and marketing resources to
successfully develop and market products, then some of our competitors may have
an advantage in developing and marketing products.

   The biotechnology and pharmaceutical industries are highly competitive and
are dominated by larger, more experienced and better capitalized companies.
Such greater experience and financial strength may enable them to bring their
products to market sooner than us, thereby gaining the competitive advantage of
being the first to market. Research on the causes of, and possible treatments
for diseases for which we are trying to develop products, including rheumatoid
arthritis, cancer, Parkinson's Disease, central nervous system disorders and
autoimmunediseases, are developing rapidly, and there is a potential for
extensive technological innovation in relatively short periods of time. There
can be no assurance that we will be able to keep pace with any new
technological developments. Factors affecting our ability to successfully
manage the technological changes occurring in the biotechnology industry as
well as our ability to successfully compete include:

  . Many of our potential competitors have significantly greater experience
    than we do in completing preclinical and clinical testing of new
    pharmaceutical products and obtaining Food and Drug Administration
    ("FDA") and other regulatory approvals of products.

  . We compete with a number of pharmaceutical and biotechnology companies
    which have financial, technical and marketing resources significantly
    greater than ours;

                                       7
<PAGE>


  . Companies with established positions and prior experience in the
    pharmaceutical industry may be better able to develop and market products
    for the treatment of those diseases for which we are trying to develop
    products;

   If our technologies are unable to successfully complete, or are adversely
affected by, the extensive regulatory process, then we may not be able to market
our products and technologies.

   Our technologies must undergo a rigorous regulatory approval process, which
includes extensive preclinical and clinical testing, to demonstrate safety and
efficiency before any resulting product can be marketed. To date, neither the
FDA nor any of its international equivalents has approved any of our
technologies for marketing. In the biotechnology industry, it is generally
accepted that less than 10 percent of the technologies for which preclinical
efforts are initiated ultimately result in an approved product. The clinical
trial and regulatory approval process can require many years and substantial
cost, and there can be no guarantee that our efforts will result in an approved
product.

   Our activities are regulated by a number of government authorities in the
United States and other countries, including the FDA pursuant to the Federal
Food, Drug and Cosmetic Act. The FDA regulates pharmaceutical products,
including their manufacture and labeling. Data obtained from testing is subject
to varying interpretations which can delay, limit or prevent FDA approval.
Risks associated with the regulatory approval process include:

  . Changes in existing regulatory requirements could prevent or affect the
    timing of our ability to achieve regulatory compliance. Federal and state
    laws, regulations and policies may be changed with possible retroactive
    effect, and how these rules actually operate can depend heavily on
    administrative policies and interpretations over which we have no control
    or inadequate experience to assess their full impact upon our business.

  . Obtaining FDA clearances is time-consuming and expensive, and there is no
    guarantee that such clearances will be granted or that the FDA review
    process will not involve delays that significantly and negatively affect
    our products. We may encounter similar delays in foreign countries.

  . Regulatory clearances may have significant limitations on the uses for
    which any approved products may be marketed.

  . Any marketed product and its manufacturer are subject to periodic review
    and any discovery of previously unrecognized problems with a product or
    manufacturer could result in suspension or limitation of approvals.

 If any of our products are approved and enter the market, they may not be
 accepted by physicians and patients if adequate insurance coverage and
 reimbursement levels aren't available for them.

   Substantially all biotechnology products are distributed to patients by
physicians and hospitals, and in most cases, such patients rely on insurance
coverage and reimbursement to pay for some or all of the cost of the product.
In recent years, the continuing efforts of government and third party payers to
contain or reduce health care costs have limited, and in certain cases
prevented, physicians and patients from receiving insurance coverage and
reimbursement for medical products, especially newer technologies. Our ability
to generate adequate revenues and operating profits could be adversely affected
if such limitations or restrictions are placed on the sale of our products.
Specific risks associated with medical insurance coverage and reimbursement
include:

  . Significant uncertainty exists as to the reimbursement status of newly
    approved health care products, and third-party payers are increasingly
    challenging the prices charged for medical products and services.

  . There can be no guarantee that adequate insurance coverage will be
    available to allow us to charge prices for products which are adequate
    for us to realize an appropriate return on our cost for developing these
    technologies. If adequate coverage and reimbursement are not provided for
    use of our products, the market acceptance of these products will be
    negatively affected.

  . Health maintenance organizations and other managed care companies may
    seek to negotiate substantial volume discounts for the sale of our
    products to their members thereby reducing our profit margins.


                                       8
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   In recent years, bills proposing comprehensive health care reform have been
introduced in Congress that would potentially limit pharmaceutical prices and
establish mandatory or voluntary refunds. There can be no guarantee that such
proposals will not negatively affect us. It is uncertain if any legislative
proposals will be adopted and how federal, state or private payers for health
care goods and services will respond to any health care reforms.

 We have no manufacturing facilities or marketing experience and expect to be
 dependent upon third parties to manufacture and market approved products.

   We currently have no manufacturing facilities for either clinical trial or
commercial quantities of any of our technologies and currently have no plans
to obtain them. To date, we have obtained the limited amount of quantities
required for preclinical and clinical trials from contract manufacturing
companies. We intend to continue using contract manufacturing arrangements
with experienced firms for the supply of material for both clinical trials and
any eventual commercial sale.

   We will depend upon third parties to produce and deliver products in
accordance with all FDA and other governmental regulations. There can be no
guarantee that such parties will consistently perform their obligations in a
timely fashion and in accordance with the applicable regulations. There can be
no guarantee that we will be able to contract with manufacturers who can
fulfill our requirements for quality, quantity and timeliness, or that we
would be able to find substitute manufacturers, if necessary. The failure by
any third party to perform their obligations may delay clinical trials, the
commercialization of products, and the ability to supply product for sale.

   We do not have any experience in marketing pharmaceutical products. In
order to earn a profit on any future product, we will be required to either
enter into arrangements with third parties with respect to marketing the
products or internally develop such marketing capability. There can be no
assurance that we will be able to enter into marketing agreements with others
on acceptable terms, or that we can successfully develop such capability on
our own.

 We have options, warrants, preferred stock and convertible debentures
 outstanding which, when exercised, may cause dilution to our stockholders.

     As of September 30, 1999, we had granted stock options and warrants to
purchase approximately 6.5 million shares of our common stock at exercise prices
ranging from $0.63-$15.00 per share, including the Class A and Class B warrants
issued to selling stockholders. Many of these previously granted options and
warrants were issued at exercise prices below the current market price of the
common stock. In addition, as of September 30, 1999, we had outstanding
$8,000,000 of convertible debentures convertible into 1,523,809 shares of our
common stock at a conversion price of $5.25. Also as of September 30, 1999, we
had 5,233 and 197,621 shares of Series A and Series C Convertible preferred
stock outstanding, respectively, which are currently convertible into 91,775 and
988,105 shares of common stock, respectively. The exercise price of our Class
A and Class B warrants and the conversion price of our convertible debentures
issued to the selling stockholders contain provisions that will decrease the
exercise price and conversion price of these instruments if we issue stock at a
price below the conversion price of the convertible debentures or exercise price
of the Class A and Class B warrants, with some limited exceptions. In addition,
there would be a reduction of the conversion price of the convertible debentures
and the exercise price of the Class A and Class B warrants, subject to certain
floors and other limitations, on each of the first and second anniversaries of
the transaction if the market price of our common stock were to be less than the
conversion or exercise price on such dates. These adjustments to the exercise
price of the Class A and Class B warrants and the conversion price of the
convertible debentures could require us to issue more shares of common stock on
exercise or conversion than we currently anticipate. The exercise of our stock
options and warrants and the conversion of our convertible debentures and
preferred stock will dilute the percentage ownership interest of our current
stockholders. In addition, the terms upon which we would be able to obtain
additional money through the sale of our stock may be negatively affected by the
existence of these warrants, options, convertible debentures and preferred stock
because new investors may be concerned about the impact upon the future market
price of the stock if these warrants, options, debentures and preferred stock
were consistently exercised or converted and the underlying stock sold.




 The floating conversion and exercise prices of our convertible debentures and
 Class A and Class B warrants could motivate the holders of these instruments to
 sell our common stock short in the public market, which could negatively effect
 our stock price

   Our convertible debentures and Class A and Class B warrants contain
provisions that could decrease the conversion price and exercise price of these
instruments if our common stock price is less than the conversion price of the
debentures and exercise prices of the warrants on the first and second
anniversary of the issuance of these instruments, or if we issue stock at a
price below the conversion or exercise price of the debentures or warrants.
These provisions could motivate the holders of these instruments, the selling
stockholders, to sell our common stock short in the public market, which could
negatively effect our stock price. Although the securities purchase agreement
between us and the selling stockholders prohibits the selling stockholders from
selling our common stock short unless they convert the debentures into common
stock within seven days of initiating such short sale, we cannot be certain that
the selling stockholders will honor this contractual obligation, or that we will
have an adequate remedy if they breach this obligation.

 The price changes and volatility of our stock is often unrelated to our
 operating performance or business developments.

   Historically, the trading volume of our common stock has fluctuated
significantly. At times our trading volume has been significant while at other
times our trading volume has been relatively low. The price changes and
volatility of our stock often appears to be unrelated to our operating
performance or business developments. Factors which may have a significant
effect on the market price of our common stock include:

                                       9
<PAGE>


  .the discovery of new technologies by competitors in fields in which we are
     developing products;

  .the results of clinical trials, whether our own or those of competitors;

  .FDA approval of new products;

  .Proposed government regulations and

  .Issues relating to patents or proprietary rights.

 Year 2000 compliance may adversely impact our financial and management
resources.

   We have initiated planning for issues related to the upcoming new
millennium. These issues derive from the use of software and hardware with
embedded chips or processors that use two digits to refer to a year and do not
properly recognize a year that begins with "20" instead of the familiar "19. "

   We primarily operate our business applications software using the Microsoft
Office suite of products. As a result, we will primarily rely on the software
developer's representations regarding Year 2000 compliance of their software.

   We intend to assess the possible effects on our operations of the Year 2000
compliance of certain relevant third parties, primarily our service providers,
by requesting confirmation from the parties regarding their Year 2000
readiness.

   We do not expect to incur costs in our Year 2000 program that will be
material to our business, financial condition or results of operations.
Although we intend to complete all phases of our Year 2000 program by December
31, 1999, there can be no assurance we will complete our program by then, and
even if this program is successfully completed on schedule, that disruptions in
our business will be avoided.

   Possible consequences of Year 2000 issues that we are unable to adequately
identify, assess or fix include but are not limited to:

  .Delays in supplies from vendors,

  .Errors in processing transactions,

  .Diversion of management time and effort to addressing difficulties that
     emerge, and

  .Loss of clinical and research data

   The goal of our Year 2000 program is to plan for and reduce the risk of such
difficulties. There can be no assurance that our Year 2000 program will be
completed in a timely manner or will be successful.

                                USE OF PROCEEDS

   The net proceeds from the sale of the securities will be received by the
selling stockholders. We will not receive any proceeds from the sale of the
securities by the selling stockholders.

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<PAGE>


                ISSUANCE OF CONVERTIBLE DEBENTURES AND WARRANTS
                            TO SELLING SHAREHOLDERS

  The following is a summary description of our issuance of the convertible
debentures and warrants which are convertible or exercisable by the selling
stockholders for common stock being offered pursuant to this prospectus.

     On September 22, 1999 we issued an aggregate of $8,000,000 in 8%
convertible debentures due September 2003 and warrants to purchase a total of
1,690,000 shares of our common stock to the selling stockholders.  The
debentures accrue interest at 8% per annum, payable semi-annually, and are
convertible by the holders into common stock at a conversion price of $5.25 per
share, subject to certain adjustments described below. Unless we elect
otherwise, the interest accrued on the convertible debentures will be paid in
shares of our common stock, subject to certain limitations. The warrants were
issued in two classes, the first, or "Class A" warrants, are exercisable to
purchase 970,000 shares of common stock at an exercise price of $5.75 per share.
The second, or "Class B" warrants, are exercisable to purchase 720,000 shares of
common stock at an exercise price of $8.25 per share. The exercise price of both
sets of warrants are also subject to adjustments described below.


     The debentures and Class A and Class B warrants contain adjustments that
will decrease the conversion price of the debentures and the exercise price of
the warrants if any of the following happens, each of which is known as a reset
event:

     .  The market price of our common stock is less than the conversion price
        of the convertible debentures or the exercise price of the warrants on
        the first or second anniversary of the issuance of the debentures and
        the warrants; or

     .  We issue common stock or convertible securities for consideration per
        share that is less than the conversion price of the debenture or
        exercise price of warrants at a time when the market price of our common
        stock is less than such conversion price or exercise price.

     If there is such a reset event, the conversion price of the debentures
will be reset to the market price of our common stock immediately after such
event; the exercise price of the Class A warrants will be reset to the market
price of our common stock immediately after such event plus 4.5%; and the
exercise price of the Class B warrants will be reset to the market price of our
common stock immediately after such event plus 50%.  In addition, the Class A
warrants' exercise price cannot be reset lower than $3.14 after the first
anniversary or $1.57 after the second anniversary, and the Class B warrants'
exercise price cannot be reset lower than $4.57 after the first anniversary or
$2.28 after the second anniversary.  There is no floor for resets resulting from
the issuance of securities.

     In addition to this reset, the conversion price of the convertible
debentures and the exercise price of the Class A and Class B warrants will also
be reduced if we issue securities at a price per share below both the market
price of the common stock and the conversion price of the debentures or exercise
price of the warrants.  If this occurs, the conversion price of the debentures
and the exercise price of the Class A and Class B warrants will be reduced to
the price per share at which the new securities were sold.  There are exceptions
to these provisions, including an exception for stock options issued pursuant to
our stock option plans.


     We also have the right to require the holders of the convertible
debentures to mandatorily convert some or all of the outstanding amount of the
debentures into common stock if the market price of the common stock reaches
certain price thresholds, ranging from $6.00 to $9.25, for a specified number of
trading days.


                           SELLING STOCKHOLDERS

     The number of shares registered in the registration statement of which this
prospectus is a part and the number of shares offered in this prospectus
represents our bona fide estimate of the number of shares issuable upon
conversion of the convertible debentures, exercise of the warrants and the
payment of interest on the debentures in shares of common stock. The number of
shares that will ultimately be issued to the selling stockholders cannot be
determined at this time because it depends on (1) whether the holders of the
convertible debentures elect to convert the convertible debentures into shares
of common stock, (2) whether we elect to require the conversion of the
convertible debentures upon the market price of the common stock meeting various
price thresholds, (3) whether the holders of the warrants exercise their
warrants, (4) the conversion price of the convertible debentures and the
exercise price of the warrants at the time of conversion of the convertible
debentures and exercise of the warrants, (5) the period for which the
convertible debentures remain outstanding, and (6) the market price of our
common stock at the time we make any interest payments on the convertible
debentures.

     The table below sets forth information regarding ownership of our common
stock by the selling stockholders and the number of shares that may be sold by
them under this prospectus. The number of shares set forth in the table as being
held by the selling stockholders includes the number of shares of common stock
that are issuable upon conversion of the convertible debentures and the exercise
of the Class A and Class B warrants as of November 22, 1999. The number of
shares set forth on the table as being offered hereby represents the total
number of shares we have registered for resale by the selling stockholders based
on our bona fide estimate of the number of shares of common stock that we will
need to issue to the selling stockholders on conversion of the debentures,
exercise of the Class A and Class B warrants and payment of all interest on the
debentures. This amount equals 120% of the number of shares of common stock
issuable as of November 22, 1999 upon conversion of the convertible debentures
and exercise of the Class A and Class B warrants and 100% of the number of
shares we believe will need to be issued as interest payments over the term of
the debentures. However, the actual number of shares of common stock issuable
upon conversion of the convertible debentures, exercise of the warrants and
payment of interest is indeterminable, and could be materially more or less than
the amounts listed on the table due to possible conversion and exercise price
adjustments, and, in the case of interest payments, changes to the market price
of our common stock. Because the selling stockholders may offer all or some
portion of the common stock listed in the table pursuant to this prospectus or
otherwise, no estimate can be given as to the amount or percentage of common
stock that will be held by the selling stockholders upon termination of the
offering. The selling stockholders may sell all, part, or none of the shares
listed. The percentage of ownership shown in the table is based on 15,327,950
shares of common stock issued and outstanding on November 22, 1999. The number
of shares owned by the selling stockholders is determined by rules promulgated
by the SEC and is not necessarily indicative of ownership for any other purpose.
None of the selling stockholders has had any position, office or other material
relationship with BLSI, other than as a security holder, during the past three
years.



<PAGE>

<TABLE>
<CAPTION>
                                Securities Owned Prior                                            Securities Owned
                                      to Offering                                                  After Offering
- -------------------------------------------------------------------------------------------------------------------------
                                        Shares of              Shares of       Percent of    Number of
          Name of Selling                 Common             Common Stock       Common       Shares of       Percent of
            Shareholder                   Stock             Offered Hereby       Stock      Common Stock    Common Stock
- -----------------------------------    -------------      ------------------  -----------  --------------  --------------

<S>                                    <C>                 <C>                 <C>           <C>              <C>
Brown Simpson Strategic Growth         2,571,048 (1)       3,565,258           14.4               0              *
 Fund, LLP.
Brown Simpson Strategic Growth           642,762 (2)         891,314            4.0               0              *
 Fund, L.P.
</TABLE>
*  Less than one percent.

(1)  Includes 1,219,048 shares issuable upon conversion of $6,400,000 of
     convertible debentures, plus 776,000 shares issuable upon the exercise of
     Class A warrants, and 576,000 shares issuable upon the exercise of Class B
     warrants. This entity is an investment fund managed by Brown Simpson
     Asset Management, LLC. Does not include shares issuable to Brown Simpson
     Strategic Growth Fund, L.P. discussed in note (2) below.

(2)  Includes 304,762 shares issuable upon conversion of $1,600,000 of
     conversion debentures, plus 194,000 shares issuable upon the exercise of
     Class A warrants, and 144,000 shares issuable upon the exercise of Class B
     warrants. This entity is an investment fund managed by Brown Simpson Asset
     Management, LLC. Does not include shares issuable to Brown
     Simpson Strategic Growth Fund, Ltd. discussed in Note (1) above.

                                       12
<PAGE>


                              PLAN OF DISTRIBUTION

     BLSI is registering the shares of common stock on behalf of the selling
stockholders.  The  selling stockholders will act independently of BLSI in
making decisions with respect to the timing, manner and size of each sale.  All
costs, expenses and fees in connection with the registration of the shares
offered by this prospectus will be borne by BLSI, other than brokerage
commissions and similar selling expenses, if any, attributable to the sale of
shares which will be borne by the selling stockholders.  Sales of shares may be
effected by selling stockholders from time to time in one or more types of
transactions (which may include block transactions) on the Nasdaq SmallCap
Market, in the over-the-counter market, in negotiated transactions, through put
or call options transactions relating to the shares, through short sales of
shares, or a combination of such methods of sale, at market prices prevailing at
the time of sale, or at negotiated prices.  Such transactions may or may not
involve brokers or dealers. However, the selling stockholders have agreed with
BLSI not to, directly or indirectly through one or more intermediaries, engage
in any short sales of common stock unless they convert the convertible
debentures into common stock within seven trading days of such short sale in an
amount that is sufficient to cover the short sale.  The selling stockholders
have advised BLSI that they have not entered into any agreements, understandings
or arrangements with any underwriters or broker-dealers regarding the sale of
their securities, nor is there an underwriter or coordinated broker acting in
connection with the proposed sale of shares by the selling stockholders.

     Subject to the restrictions noted above, the selling stockholders may enter
into hedging transactions with broker-dealers or other financial institutions.
In connection with such transactions and subject to the restrictions noted
above, broker-dealers or other financial institutions may engage in short sales
of the shares or of securities convertible into or exchangeable for the shares
in the course of hedging positions they assume with selling stockholders. The
selling stockholders may also enter into options or other transactions with
broker-dealers or other financial institutions which require the delivery to
such broker-dealers or other financial institutions of shares offered by this
prospectus, which shares such broker-dealer or other financial institution may
resell pursuant to this prospectus (as amended or supplemented to reflect such
transaction).

     The selling stockholders may make these transactions by selling shares
directly to purchasers or to or through broker-dealers, which may act as agents
or principals.  Such broker-dealers may receive compensation in the form of
discounts, concessions or commissions from selling stockholders and/or the
purchasers of shares for whom such broker-dealers may act as agents or to whom
they sell as principal, or both (which compensation as to a particular broker-
dealer might be in excess of customary commissions).

     The selling stockholders and any broker-dealers that act in connection with
the sale of shares are "underwriters" within the meaning of Section 2(11) of the
Securities Act, and any commissions received by such broker-dealers or any
profit on the resale of the shares sold by them while acting as principals might
be deemed to be underwriting discounts or commissions under the Securities Act.
The selling stockholders may agree to indemnify any agent, dealer or broker-
dealer that participates in transactions involving sales of the shares against
certain liabilities, including liabilities arising under the Securities Act.

     Because selling stockholders are "underwriters" within the meaning of
Section 2(11) of the Securities Act, the selling stockholders will be subject to
the prospectus delivery requirements of the Securities Act. We have informed the
selling stockholders that the anti-manipulative provisions of Regulation M
promulgated under the Exchange Act may apply to their sales in the market.

     Selling stockholders also may resell all or a portion of the shares in open
market transactions in reliance upon Rule 144 under the Securities Act, provided
they meet the criteria and conform to the requirements of Rule 144.

     Upon BLSI being notified by a selling stockholder that any material
arrangement has been entered into with a broker-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 supplement to this
prospectus will be filed, if required, pursuant to Rule 424(b) under the
Securities Act, disclosing:

         .  the name of each such selling stockholder and of the participating
            broker-dealer(s);

         .  the number of shares involved;

         .  the initial price at which such shares were sold;

         .  the commissions paid or discounts or concessions allowed to such
            broker-dealer(s), where applicable;

         .  that such broker-dealer(s) did not conduct any investigation to
            verify the information set out or incorporated by reference in this
            prospectus; and

         .  other facts material to the transactions.

          We have agreed to indemnify the selling stockholders in certain
circumstances against some liabilities, including liabilities that could arise
under the Securities Act.   The selling stockholders have agreed to indemnify
us, our directors and our officers who sign the registration statement against
some liabilities, including liabilities that could arise under the Securities
Act.

          We have agreed to maintain the effectiveness of this registration
statement until the earlier of the sale of all the shares offered by this
prospectus or the date that each holder of such shares can sell all of the
shares it holds in any three-month period in compliance with Rule 144
promulgated under the Securities Act, but in no event for more than five years
following the effectiveness of the registration statement of which this
prospectus is a part.  No sales may be made pursuant to this prospectus after
the expiration date unless we amend or supplement this prospectus to indicate
that we have agreed to extend the period of effectiveness.  The selling
stockholders may sell all, some or none of the shares offered by this
prospectus.


                                       13
<PAGE>

   We have agreed to indemnify the selling stockholders in certain circumstances
against some liabilities, including liabilities that could arise under the
Securities Act. Each selling stockholder has agreed to indemnify us, our
directors and our officers who sign the registration statement against some
liabilities, including liabilities that could arise under the Securities Act.

                                  THE COMPANY

   Boston Life Sciences, Inc. was incorporated in Delaware in 1972 under the
name Greenwich Pharmaceuticals Incorporated ("Greenwich"). Effective June 15,
1995, Greenwich merged with a privately-held company named Boston Life Sciences,
Inc. (the "merger"). Greenwich survived the merger and changed its name to
Boston Life Sciences, Inc. On June 6, 1997, our stockholders approved a one-for-
ten reverse split of the common stock effective as of June 9, 1997. Our
principal executive offices are located at 137 Newbury Street, 8th Floor,
Boston, Massachusetts, and the telephone number is (617) 425-0200.


                                       14
<PAGE>

                   DESCRIPTION OF SECURITIES TO BE REGISTERED

General

   BLSI is authorized to issue 30,000,000 shares of common stock and 1,000,000
shares of preferred stock, each with a par value $.0l per share. As of November
22, 1999, the Company has 15,327,950 shares of common stock and 196,121 shares
of Series C and 4,983 shares of Series A preferred stock issued and outstanding.
Under its certificate of incorporation, its Board of Directors is authorized,
without stockholder approval, to issue such preferred stock into series with
such voting rights, designations, preferences, limitations and special rights as
may be designated by the Board of Directors from time to time.

   Shares of the our common stock are being registered under this registration
statement. The following is a summary description of our outstanding common
stock and is qualified in its entirety by reference to our certificate of
incorporation and bylaws, which are exhibits to or incorporated by reference in
the registration statement of which this prospectus is a part.

Common Stock

   Subject to the rights and preferences of our preferred stock, holders of
shares of the common stock are entitled to receive dividends, as and to the
extent dividends may be declared by our Board of Directors, out of funds legally
available therefor. In the event of a liquidation, dissolution or winding up of
BLSI, holders of shares of the common stock are entitled to share ratably in all
assets remaining after payment of liabilities and preferences to holders of
preferred stock. Holders of shares of common stock are entitled to one vote per
share on all matters on which stockholders are entitled to vote. The holders of
a majority of the outstanding shares of common stock entitled to vote
constitutes a quorum for taking action by the stockholders. Except for matters
where a higher vote is required by law, the affirmative vote of the holders of
shares of common stock present or represented and entitled to vote is required
to take any such action. Holders of shares of the common stock have no
preemptive, conversion or other subscription rights. There are no redemption,
sinking fund or call provisions applicable to the common stock.

   The holders of the common stock have rights under a stockholder rights plan
which has been adopted by the Board of Directors. Under the rights plan, the
holders of common stock received one right (the "right") to purchase a
fractional share of a new class of preferred stock for each share of common
stock owned by such holder. If a person or a group acquires fifteen percent or
more of the outstanding shares of the common stock, the rights may separate from
the shares of common stock and become exercisable. Once the rights are
exercised, the rights plan may allow holders of the rights (other than the
person or group acquiring fifteen percent of the common stock) at a substantial
discount. The rights will expire in September 2001 unless exercised by the
holders or redeemed or exchanged by us. The rights plan could make it more
difficult, and therefore discourage attempts, to acquire control of BLSI. This
description of the rights plan is qualified by reference to the registration
statement on Form 8-A relating to the rights plan, which is incorporated herein
by reference and made a part hereof.

                                 LEGAL MATTERS

   The validity of the shares of common stock offered hereby will be passed upon
for BLSI by Ropes & Gray, Boston, Massachusetts.

                                    EXPERTS

   Our consolidated financial statements as of December 31, 1998 and 1997, and
for each of the three years in the period ended December 31, 1998, incorporated
by reference in this prospectus from our Annual Report on Form 10-K as amended
by the Form 10-K/A have been so included in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

                                       15
<PAGE>

                             AVAILABLE INFORMATION

   This prospectus, which constitutes a part of a registration statement on Form
S-3 (the "registration statement") filed by us 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 BLSI 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 or via the Commission's web site 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.

   We are subject to the informational requirements of the Exchange Act, and,
accordingly, file 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, NW, Washington,
D.C. 20549, and at the Commission's Regional Offices located at Seven World
Trade Center, Suite 1300, 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 Room of the
Commission at Judiciary Plaza, 450 Fifth Street, NW, Washington, D.C. 20549, at
prescribed rates. Information regarding the operation the Public Reference Room
may be obtained by calling the Commission at 1-800-SEC-0330. The Commission
maintains a web site (http://www.sec.gov) that contains material regarding
issuers that file electronically with the Commission. In addition, our common
stock is traded on the Nasdaq Smallcap Market and reports and proxy statements
concerning us can be inspected at the offices of the National Association of
Securities Dealers, Inc., 1735 K Street, NW, Washington, D.C. 20006.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   The following documents or portions of documents filed by us (File No. 0-
6533) with the Commission are incorporated herein by reference:

     (a) Annual Report on Form 10-K, as amended by the Form 10-K/A for the
  fiscal year ended December 31, 1998.

     (b) Quarterly Reports on Form 10-Q for the periods ended March 31, 1999,
  June 30, 1999 and September 30, 1999.

     (c) Our Definitive Proxy Statement dated May 15, 1999 for the Company's
  1999 Annual Meeting of Stockholders.

    (d) Current Reports on Form 8-K filed January 26, 1999, February 5, 1999,
  February 16, 1999, March 15, 1999, July 7, 1999, August 6, 1999, August 20
  1999, September 23, 1999, September 27, 1999 and November 19, 1999.

     (e) The description of our common stock contained in our registration
  statements on Form 8-A filed under the Exchange Act, including any amendment
  or reports filed for the purpose of updating such descriptions.

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

                                       16
<PAGE>

statement contained or incorporated by 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 written or oral request, we will provide without charge to each person,
including any beneficial owner, 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 Joseph P. Hernon,
Executive Vice President and Chief Financial Officer, 137 Newbury Street, 8th
Floor, Boston, Massachusetts 02116, telephone number (617) 425-0200.

                                       17
<PAGE>

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

   We have not authorized any dealer, salesperson or other person to give any
information or represent anything not contained in this prospectus. You must
not rely on any unauthorized information. If anyone provides you with different
or inconsistent information, you should not rely on it. This prospectus does
not offer to sell any shares in any jurisdiction where it is unlawful. The
information in this prospectus is current as of the date shown on the cover
page.

                           Boston Life Sciences, Inc.

                              4,456,572 Shares of
                                 Common Stock

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

                                  PROSPECTUS

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

                               November 24, 1999

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

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

<TABLE>
     <S>                                                                <C>
     Securities and Exchange Commission filing fee..................... $ 5,000
     Printing expenses.................................................   2,000
     Legal, accounting and other professional services.................  25,000
     Miscellaneous.....................................................   3,000
                                                                        -------
       Total........................................................... $35,000
                                                                        =======
</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 us 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, we have obtained Directors' and Officers' Liability Insurance,
which insures its officers and directors against certain liabilities such
persons may incur in their capacities as our officers or directors.

   Article 6 of the our 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
  Corporation existing at the time of such repeal or modification.


   Article VI of the our by-laws provides in relevant part as follows:

     Section 1. The corporation shall indemnify any person who was or is a
  party or is threatened to be made a party to any threatened, pending or
  completed action, suit or proceeding, whether civil, criminal,
  administrative or investigative (other than an action by or in the right of
  the Corporation) by reason of the fact that he is or was a director,
  officer, employee or agent of the corporation, or is or was serving at the
  request of the corporation as a director, officer, employee or agent of
  another corporation, partnership, joint venture, trust or other enterprise,
  against expenses (including attorneys' fees), judgments, fines and amounts
  paid in settlement actually and reasonably incurred by him in connection
  with such action, suit or proceeding if he acted in good faith and in a
  manner he reasonably believed to be in or not opposed to the best interests
  of the corporation, and with respect to any criminal action or proceeding,
  had no reasonable cause to believe his conduct was unlawful. The
  termination of any action, suit or proceeding by judgment, order,
  settlement, conviction, or upon a plea of nolo contendere or its
  equivalents, shall not, of itself, create a presumption that the person did
  not act in good faith and in a manner which he reasonably believed to be in
  or not opposed to the best interests of the corporation, and, with respect
  to any criminal action or proceeding, had reasonable cause to believe that
  his conduct was unlawful.

                                      II-1
<PAGE>

     Section 2. The corporation shall indemnify any person who was or is a
  party or is threatened to be made a party to any threatened, pending or
  completed action or suit by or in the right of the corporation to procure a
  judgment in its favor by reason of the fact that he is or was a director,
  officer, employee or agent of the corporation as a director, officer,
  employee or agent of another corporation, partnership, joint venture, trust
  or other enterprise against expenses (including attorneys' fees) actually
  and reasonably incurred by him in connection with the defense or settlement
  of such action or suit if he acted in good faith and in a manner he
  reasonably believed to be in or not opposed to the best interests of the
  corporation except that no indemnification shall be made in respect of any
  claim, issue or matter as to which such person shall have been adjudged to
  be liable to the corporation unless and only to the extent that the Court
  of Chancery or the court in which such action or suit was brought shall
  determine upon application that, despite the adjudication of liability but
  in view of all the circumstances of the case, such person is fairly and
  reasonably entitled to indemnity for such expenses which the Court of
  Chancery or such other court shall deem proper.

ITEM 16. EXHIBITS

   The following is a list of exhibits filed as part of this registration
statement.

     EXHIBIT
     NUMBER                                    DESCRIPTION AND METHOD OF FILING
     ------                                    --------------------------------
     4.1  Specimen Common Stock Certificate.  (1)

     4.2  Form of Debenture Agreement dated September 22, 1999 between the Brown
          Simpson Strategic Growth Fund, Ltd. and the Brown Simpson Strategic
          Growth Fund, L.P. and the Company. (2)

     4.3  Form of Class A Common Stock Purchase Warrant received by the Brown
          Simpson Strategic Growth Fund, Ltd. and the Brown Simpson Strategic
          Growth Fund, L.P. (2)
     4.4  Form of Class B Common Stock Purchase Warrant received by the Brown
          Simpson Strategic Growth Fund, Ltd. and the Brown Simpson Strategic
          Growth Fund, L.P. (2)
     5    Opinion of Ropes & Gray  (3)
     10.1 Securities Purchase Agreement dated September 22, 1999 between the
          Brown Simpson Strategic Growth Fund, Ltd. and the Brown Simpson
          Strategic Growth Fund, L.P. and the Company. (2)
     10.2 Registration Rights Agreement dated September 22, 1999 between the
          Brown Simpson Strategic Growth Fund, Ltd. and the Brown Simpson
          Strategic Growth Fund, L.P. and the Company (2)
     23.1 Consent of Ropes & Gray (3)
     23.2 Consent of PricewaterhouseCoopers LLP (4)
     24   Power of Attorney (3)
______________
(1)  Incorporated by reference to Boston Life Sciences, Inc.'s Registration
     Statement on Form S-3 filed with the Securities and Exchange Commission,
     Registration No. 33-25955.
(2)  Incorporated by reference to Boston Life Sciences, Inc.'s Report on Form 8-
     K filed September 27, 1999.

(3)  Previously filed.
(4)  Filed herewith.

                                      II-2

<PAGE>

ITEM 17. UNDERTAKINGS

A. Rule 415 Offering

   The undersigned registrant hereby undertakes:

      (1) to file, during any period in which offers or sale; 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 (1)(i) and (1)(ii) above do not apply if
  the registration statement is on Form S-3 or Form S-8, and the information
  required to be, included in a post-effective amendment by those paragraphs
  is contained in periodic reports filed by the registrant pursuant to
  Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
  incorporated by reference in the registration statement.

      (2) 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.

B. Filings Incorporating Subsequent Exchange Act Documents by Reference

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

C. Request for Acceleration of Effective Date

   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

                                      II-3
<PAGE>

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-4
<PAGE>

                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
the Registration Statement (File No. 333-89159) to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Boston, Commonwealth
of Massachusetts, on November 24, 1999.

                                         Boston Life Sciences, Inc.

                                                  /s/ S. David Hillson
                                          By: _________________________________
                                                      S. David Hillson
                                               President and Chief Executive
                                                          Officer


   Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to the Registration Statement on Form S-3 (File No. 333-89159) 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, Chairman and Chief  November 24, 1999
______________________________________  Executive Officer and
           S. David Hillson             Director (Principal
                                        Executive Officer)

                   *                    Director, Executive Vice       November 24, 1999
______________________________________  President and Chief
         Marc E. Lanser, M.D.           Scientific Officer

       /s/ Joseph P. Hernon             Vice President and Chief       November 24, 1999
______________________________________  Financial Officer
           Joseph P. Hernon             (Principal Financial and
                                        Accounting Officer)

                   *                    Director                       November 24, 1999
______________________________________
         Colin B. Bier, Ph.D.

                   *                    Director                       November 24, 1999
______________________________________
          Edson D. de Castro

                   *                    Director                       November 24, 1999
______________________________________
           Adrian M. Gerber

                   *                    Director                       November 24, 1999
______________________________________
        Ira W. Lieberman Ph.D.
                   *                    Director                       November 24, 1999
______________________________________
      E. Christopher Palmer, CPA


* By: /s/ Joseph P. Hernon                                             November 24, 1999
     ----------------------------------
          Joseph P. Hernon

Attorney-in-fact
</TABLE>

                                     II-5

<PAGE>

                                 EXHIBIT INDEX

     EXHIBIT
     NUMBER                                    DESCRIPTION AND METHOD OF FILING
     ------                                    --------------------------------
     4.1  Specimen Common Stock Certificate.  (1)

     4.2  Form of Debenture Agreement dated September 22, 1999 between the Brown
          Simpson Strategic Growth Fund, Ltd. and the Brown Simpson Strategic
          Growth Fund, L.P. and the Company. (2)

     4.3  Form of Class A Common Stock Purchase Warrant received by the Brown
          Simpson Strategic Growth Fund, Ltd. and the Brown Simpson Strategic
          Growth Fund, L.P. (2)
     4.4  Form of Class B Common Stock Purchase Warrant received by the Brown
          Simpson Strategic Growth Fund, Ltd. and the Brown Simpson Strategic
          Growth Fund, L.P. (2)
     5    Opinion of Ropes & Gray  (3)
     10.1 Securities Purchase Agreement dated September 22, 1999 between the
          Brown Simpson Strategic Growth Fund, Ltd. and the Brown Simpson
          Strategic Growth Fund, L.P. and the Company. (2)
     10.2 Registration Rights Agreement dated September 22, 1999 between the
          Brown Simpson Strategic Growth Fund, Ltd. and the Brown Simpson
          Strategic Growth Fund, L.P. and the Company (2)
     23.1 Consent of Ropes & Gray  (3)
     23.2 Consent of PricewaterhouseCoopers LLP (4)
     24   Power of Attorney (3)
______________
(1)  Incorporated by reference to Boston Life Sciences, Inc.'s Registration
     Statement on Form S-3 filed with the Securities and Exchange Commission,
     Registration No. 33-25955.
(2)  Incorporated by reference to Boston Life Sciences, Inc.'s Report on Form 8-
     K filed September 27, 1999.

(3)  Previously filed.
(4)  Filed herewith.

                                     II-6

<PAGE>

                                                                    Exhibit 23.2



                       CONSENT OF INDEPENDENT ACCOUNTANTS



We hereby consent to the incorporation by reference in the Amendment No. 1 to
the Registration Statement on Form S-3 (File No. 333-89159) of our report dated
March 11, 1999 relating to the consolidated financial statements, which appears
in Boston Life Sciences, Inc.'s Annual Report on Form 10-K/A for the year ended
December 31, 1998. We also consent to the reference to us under the heading
"Experts" in such Registration Statement.



                                                      PricewaterhouseCoopers LLP


Boston, Massachusetts

November 24, 1999




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