U S BIOSCIENCE INC
S-3, 1996-01-05
PHARMACEUTICAL PREPARATIONS
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<PAGE>
 
 As filed with the Securities and Exchange Commission via the EDGAR system on
 January 5, 1996
                                                   Registration No. 33-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

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

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

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

                             U.S. Bioscience, Inc.
             (Exact Name of Registrant as Specified in its Charter)

         Delaware                                       23-2460100
(State or other jurisdiction of                      (I.R.S. Employer
incorporation or organization)                     Identification Number)

                                One Tower Bridge
                                100 Front Street
                          West Conshohocken, PA  19428
                                 (610) 832-0570
         (Address, including zip code, and telephone number, including
            area code, of Registrant's principal executive offices)

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

                              DR. PHILIP S. SCHEIN
                            Chief Executive Officer
                             U.S. Bioscience, Inc.
                                One Tower Bridge
                                100 Front Street
                          West Conshohocken, PA  19428
                                 (610) 832-0570
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                   Copies to:
                             Alan H. Molod, Esquire
                      Wolf, Block, Schorr and Solis-Cohen
                         Twelfth Floor Packard Building
                      S.E. Corner 15th & Chestnut Streets
                            Philadelphia, PA  19102

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

     Approximate date of commencement of the proposed sale to the public:  From
time to time after this Registration Statement becomes 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 filed as a post-effective amendment filed pursuant to Rule
462(c) 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 delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [_]

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


                        CALCULATION OF REGISTRATION FEE

<TABLE> 
<CAPTION> 
==================================================================================================================
 
                                                                 Proposed           Proposed
                                                   Amount         Maximum            Maximum        Amount of
            Title of Each Class of                 to be      Offering Price        Aggregate      Registration
          Securities to be Registered            Registered    Per Share(1)     Offering Price(1)      Fee
- ------------------------------------------------------------------------------------------------------------------
<S>                                              <C>          <C>               <C>                <C>
Common Stock, par value $0.005 per share, and
Preferred Stock Purchase Rights(2)               8,142,578       $4.78125        $38,931,701         $13,425
================================================================================================================== 
</TABLE>

 (1)  Estimated solely for the purpose of calculating the registration fee, on
the basis of the average of the high and low prices of the Company's Common
Stock on the American Stock Exchange on December 29, 1995. The Company will not
receive any of the proceeds of the offering.

 (2)  The Preferred Stock Purchase Rights currently trade with the Common Stock
and are not currently exercisable.

     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 Securities and Exchange Commission, acting
pursuant to said Section 8(a), may determine.

================================================================================
<PAGE>
 
               SUBJECT TO COMPLETION, DATED JANUARY 5, 1996

PROSPECTUS
                                8,142,578 Shares
                             U.S. BIOSCIENCE, INC.
                                  Common Stock
                               ($0.005 par value)

           All of the shares of Common Stock, par value $.005 per share ("Common
    Stock"), of U.S. Bioscience, Inc. (the "Company") offered hereby (the
    "Shares") will be sold from time to time by certain stockholders (the
    "Selling Stockholders") of the Company. The Shares include (1) 1,120,112
    Shares of Common Stock issued to two of the Selling Stockholders pursuant to
    the Company's December 1995 private placement (the "Private Placement"), and
    (2) up to 7,022,466 Shares issuable upon the conversion of the Convertible
    Notes due December 6, 1998 (the "Notes") issued by the Company in the
    Private Placement or Shares that may be, at the option of the Company,
    issued by the Company in payment of interest on the Notes. The Company will
    not receive any of the proceeds from the sale of the Shares offered hereby.
    All brokerage commissions and other similar expenses incurred by the Selling
    Stockholders will be borne by such Selling Stockholders. Other expenses of
    the offering, estimated at $60,000, will be borne by the Company.

           The sale of the Shares by the Selling Stockholders may be effected
    from time to time in one or more transactions (which may involve block
    transactions) on the American Stock Exchange (the "AMEX") or in the over-
    the-counter market, in negotiated transactions or by a combination of such
    methods of sale, at fixed prices, at market prices prevailing at the time of
    the sale, at prices related to the prevailing market prices or at negotiated
    prices. The Selling Stockholders may effect such transactions with or
    through one or more broker-dealers, which may act as agent or principal. The
    Selling Stockholder and/or any broker-dealer affecting the sales may be
    deemed to be an "underwriter" within the meaning of Section 2(11) of the
    Securities Act of 1933, and any commissions received by the broker-dealer
    and any profit on the resale of shares as principal may be deemed to be
    underwriting discounts and commissions under such Act. The Selling
    Stockholders may transfer their Shares or their Notes to other persons who
    may, in turn, resell Shares in the manner described above. Additionally, the
    Selling Stockholders may pledge or make gifts of their Shares and the Shares
    may also be sold by the pledgees or transferees. The Selling Stockholders
    may also transfer their Shares pursuant to Rule 144 under the Securities Act
    of 1933, whether or not the Registration Statement of which this Prospectus
    forms a part is effective at the time of any such transfer.

           The Common Stock is traded on the American Stock Exchange under the
    symbol UBS. On January 2, 1996, the last reported sale price of the Common
    Stock on the AMEX was $5.0625 per share.

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

           For information relating to certain risk factors relating to the
     Common Stock, see "Risk Factors" on page 5 of the 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 OR ANY SUPPLEMENT
     HERETO. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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

                 The date of this Prospectus is _______, 1996
<PAGE>
 
                             AVAILABLE INFORMATION

           U.S. Bioscience, Inc. (the "Company") is subject to the informational
     requirements of the Securities Exchange Act of 1934, as amended (the
     "Exchange Act"), and in accordance therewith files reports, proxy
     statements and other information with the Securities and Exchange
     Commission (the "Commission"). Reports, proxy statements and other
     information filed by the Company with the Commission can be inspected and
     copied at the public reference facilities maintained by the Commission at
     450 Fifth Street N.W., Room 1024, Washington, D.C. 20549 and at the
     Commission's regional offices located at Seven World Trade Center, 13th
     Floor, New York, New York 10048, and 500 West Madison Street, Suite 1400,
     Chicago, Illinois 60661. Copies of such materials can be obtained from the
     Public Reference Section of the Commission at 450 Fifth Street N.W., Room
     1024, Washington, D.C. 20549, at prescribed rates. In addition, such
     materials can be inspected at the offices of the AMEX, 86 Trinity Place,
     New York, New York 10005, on which the Company's Common Stock is listed.

           The Company has filed with the Commission a Registration Statement on
     Form S-3 under the Securities Act with respect to the securities offered
     hereby, of which this Prospectus is a part. This Prospectus does not
     contain all of the information set forth in the Registration Statement,
     certain parts of which have been omitted in accordance with the rules and
     regulations of the Commission. For further information with respect to the
     Company and the securities offered hereby, reference is made to the
     Registration Statement, including the exhibits filed as part thereof or
     otherwise incorporated therein. Copies of the Registration Statement and
     the exhibits may be inspected, without charge, at the offices of the
     Commission, or obtained at prescribed rates from the Public Reference
     Section of the Commission and the AMEX at their respective addresses set
     forth above.


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

           The following documents other than Financial Data Schedules, which
     have been filed by the Company with the Commission, are incorporated by
     reference in this Prospectus:

           (i)   the Annual Report on Form 10-K (including the portions of the
                 Company's definitive proxy statement for the 1995 Annual
                 Meeting of Shareholders incorporated by reference therein) for
                 the fiscal year ended December 31, 1994;

           (ii)  the Quarterly Reports on Form 10-Q for the quarters ended March
                 31, 1995, June 30, 1995 and September 30, 1995;

           (iii) the Current Report on Form 8-K dated June 7, 1995 and Amendment
                 No. 1 on Form 8-K/A to Current Report on Form 8-K, dated July
                 20, 1995; and

           (iv)  the Current Report on Form 8-K dated December 28, 1995.

           All documents filed by the Company pursuant to Section 13(a), 13(c),
     14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus
     and prior to the termination of the offering described herein shall be
     deemed to be incorporated by reference into this Prospectus and to be a
     part

                                       2
<PAGE>
 
     hereof from the date of filing of such documents, except Financial Data
     Schedules and except as to any portion of such document which is not deemed
     to be filed under such sections.

           Any statement contained herein or in a document incorporated or
     deemed to be incorporated by reference herein shall be deemed to be
     modified or superseded for purposes of this Prospectus to the extent that a
     statement contained in this Prospectus or in any subsequently filed
     document which also is or is deemed to be incorporated by reference herein
     modifies or supersedes such statement. Any such statement so modified or
     superseded shall not be deemed, except as so modified or superseded, to
     constitute a part of this Prospectus. All information appearing in this
     Prospectus is qualified in its entirety by the information and financial
     statements (including notes thereto) appearing in the documents
     incorporated herein by reference, except to the extent set forth in the
     immediately preceding statement.

           The Company will provide without charge to each person to whom a copy
     of this Prospectus is delivered, on the written or oral request of such
     person, a copy of any or all documents incorporated by reference into this
     Prospectus except the exhibits to such documents (unless such exhibits are
     specifically incorporated by reference in such documents). Requests for
     such copies should be directed to the Company at One Tower Bridge, 100
     Front Street, West Conshohocken, PA 19428; telephone number (610) 832-0570,
     Attention: Corporate Secretary.

                                       3
<PAGE>
- --------------------------------------------------------------------------------

                               PROSPECTUS SUMMARY

           The following summary is qualified in its entirety by the more
     detailed information and financial statements and notes thereto
     incorporated by reference into or appearing elsewhere in this Prospectus.


                                  The Company

           The Company was incorporated in Delaware on May 7, 1987. It is a
     pharmaceutical firm established to develop and market drugs, principally
     drugs for treating patients with cancer and allied diseases such as AIDS.
     The objective of the Company is to become an important participant in the
     worldwide oncologic market. To achieve this objective, the Company's
     strategy to date has been to identify and acquire licenses (in most
     instances exclusive) in the United States and certain other markets, for
     therapeutic agents that the Company believes may have potentially
     significant commercial and clinical value in the treatment of cancer and
     allied diseases. The Company's primary emphasis has been on "late-stage"
     drugs, which are drugs having an established preclinical or clinical
     database and for which development by the Company will consist largely of
     further preclinical testing, clinical trials and the preparation of
     applications for regulatory approval. By acquiring rights to drugs that
     have undergone some degree of development and for which preclinical and
     clinical information exist, the Company believes that it will be able to
     reduce the cost, risks and time involved in bringing drugs to market. Three
     of the Company's drugs have been approved for sale in the United States by
     the United States Food and Drug Administration ("FDA") and for sale in
     various countries outside of the United States. The Company's long term
     strategy focuses on the commercialization of its approved drugs and on the
     commercialization, research and development of additional pharmaceutical
     agents, including anticancer agents, currently in various stages of
     development.

           The Company's address is One Tower Bridge, 100 Front Street, West
     Conshohocken, PA  19428 and its phone number is (610) 832-0570.


                           Common Stock Outstanding

<TABLE> 
     <S>                                      <C> 
     Common Stock currently outstanding.....  42,093,890 shares(1)
     AMEX symbol............................  UBS
</TABLE> 
     ---------
     (1) Includes 1,120,112 Shares included in this offering. Excludes the
         7,022,466 Shares covered by this Prospectus which may be issued
         on conversion of the Notes or upon payment of interest on the
         Notes. Also excludes 6,049,180 shares issuable upon exercise of
         outstanding stock options and warrants. As of December 31, 1995,
         stock options and warrants to purchase 2,361,724 shares and
         1,096,505 shares, respectively, were exercisable, at prices
         ranging from $2.3125 to $15.10; if all such options and warrants
         were exercised, and the 7,022,466 Shares issuable pursuant to the
         Notes were issued, there would be outstanding after this offering
         a total of 52,574,585 shares.

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

                                       4
<PAGE>
 
                                 RISK FACTORS

           The following factors should be considered carefully in evaluating an
     investment in the Shares offered by this Prospectus.

           Development Stage Company. The Company is a development stage
     company. Since its inception the Company has been engaged in organizational
     activities, in the research and development of its drugs and in the
     marketing of two of its drugs. The Company received U.S. regulatory
     approval for marketing Hexalen(R) (altretamine), a drug for the treatment
     of advanced ovarian cancer, in December 1990, for marketing NeuTrexin(R)
     (trimetrexate glucuronate for injection), a drug for the treatment of
     Pneumocystis carinii pneumonia ("PCP"), in December 1993 and for marketing
     Ethyol(R) (amifostine), a selective cytoprotective agent for reducing
     cumulative renal toxicity associated with repeated administration of
     cisplatin in patients with advanced ovarian cancer, in December 1995. Sales
     of Hexalen and NeuTrexin to date have been modest.

           The Company expects that Ethyol will be launched in the United States
     in early 1996. U.S. Ethyol distribution and marketing rights were granted
     to ALZA Corporation ("ALZA") by an agreement dated December 12, 1995, as a
     part of a revised commercialization strategy of the Company. Under the
     terms of such agreement, ALZA has exclusive rights to market Ethyol in the
     United States for five years and will be responsible for sales and
     marketing; the Company's sales force will co-promote the product with ALZA.
     After the five year period, which ALZA has an option to extend for one
     year, marketing and distribution rights to Ethyol will revert to the
     Company and ALZA will receive payments for ten years based on sales of the
     product. There can be no assurance that sales of NeuTrexin, Hexalen or
     Ethyol will have a material impact on the Company's financial performance.
     The Company's operations are subject to numerous competitive and other
     risks associated with the establishment and development of a new business.

           Need for Additional Funds. The funds raised in the Private Placement
     and the distribution fees from ALZA are providing the Company with
     approximately $39 million in working capital, which the Company believes
     will be sufficient to cover operating expenses at current levels for the
     foreseeable future. The Company is hopeful that its products will, in the
     near future, generate sufficient sales to provide meaningful cash
     resources, although no assurance can be given that they will do so. The
     Company is also hopeful that the Company will in the future receive further
     regulatory approvals and that such approvals will increase sales. However,
     no assurance can be given that further regulatory approvals will be
     obtained in a timely manner, if ever, or that the Company will have
     adequate financial resources to commercialize its products when approved or
     that product sales will be sufficient to cover operating expenses. Although
     the Company will from time to time explore additional sources of financing,
     there can be no assurance that the Company will be successful in obtaining
     such financing.

           The Company's future liquidity and capital requirements are dependent
     upon several factors, including, but not limited to, its success in
     generating significant revenues from sales; the performance of its
     sublicensees and distributors under sublicense and distribution
     arrangements for sales of its products; the time and cost required to
     manufacture and market its products; the time and cost required to obtain
     regulatory approvals, including expanded labelling for its products which
     are already commercially available; obtaining the rights to additional
     commercially viable compounds; competitive technological developments;
     additional governmental-imposed regulation and control; and changes in
     healthcare systems which affect reimbursement, pricing or availability of
     drugs and market acceptance of drugs. The above factors may also affect
     realization of certain assets currently held by the Company, principally
     investments in plant, equipment and inventory.

           Absence of Operating Profits; Uncertainty of Future Financial
     Results. The Company has been unprofitable since its inception and expects
     to incur additional operating losses until such time as substantial sales
     are realized and further regulatory approvals are obtained, although the
     distribution fees from ALZA Corporation could bring the Company to a
     breakeven position for 1995. The Company's losses may increase as the
     Company continues its

                                       5
<PAGE>
 
     commercialization, research and development activities, and such losses may
     fluctuate from quarter to quarter. There can be no assurance that the
     Company will ever achieve significant revenues or profitable operations.
     For the period from May 7, 1987 (inception) through September 30, 1995, the
     Company had an accumulated deficit of $117,209,400.

           Technological and Market Uncertainty. Although Hexalen, NeuTrexin and
     Ethyol have been approved for marketing by the FDA, the other drugs and
     related therapies currently in the Company's portfolio, and continued
     efforts to expand the labeling for its approved products, will require
     varying degrees of research and development, including clinical testing,
     prior to their commercialization. There can be no assurance that the
     Company's research and development efforts will be successful or that its
     drugs and related therapies will be proven to be safe and effective in
     clinical trials. As of July 15, 1995, the Company has discontinued its
     clinical development of the drug rogletimide and terminated its license
     agreement for rogletimide with British Technology Group Limited. Moreover,
     even if the Company's drugs and related therapies are approved for sale by
     the appropriate regulatory authority, there can be no assurance that these
     drugs and related therapies will be commercially successful. The Company
     may encounter unanticipated problems relating to development,
     manufacturing, distribution and marketing, some of which may be beyond the
     Company's ability to solve. The failure to address adequately such problems
     could have a material adverse effect on the Company's business and
     prospects. Finally, there can be no assurance that the Company's products
     will not be rendered obsolete by competitors' products.

           Government Regulations. Prior to marketing in the United States, each
     of the Company's drugs must undergo an extensive regulatory approval
     process conducted by the FDA and, prior to marketing in other countries, by
     comparable agencies in such countries. This process, which includes a
     review of pre-clinical and clinical testing and confirmation by the FDA
     that good laboratory and clinical practices were maintained during testing,
     can take many years and require the expenditure of substantial resources.
     The Company is dependent on the laboratories and medical institutions
     conducting its pre-clinical and clinical testing to maintain both good
     laboratory and good clinical practices established by the FDA. Data
     obtained from pre-clinical and clinical testing are subject to varying
     interpretations which could delay, limit or prevent regulatory approval. In
     addition, delays or rejections may be encountered based upon changes in FDA
     or foreign regulatory authority policies for drug approval during the
     period of development and regulatory review of each submitted product.
     There can be no assurance that even after such time and expenditures
     regulatory approval will be obtained from any of the Company's drugs
     currently under investigation. Moreover, such approval may entail
     limitations on the indicated uses for which a drug may be marketed.
     Further, even if such regulatory approval is obtained, a marketed
     therapeutic product and its manufacturer are subject to continual review,
     and late discovery of previously unknown problems with a product or
     manufacturer may result in restrictions on such product or manufacturer,
     including withdrawal of such products from the market. Changes in the
     manufacturers used by the Company for any of the Company's approved drugs
     are subject to FDA review, which could have an adverse effect upon the
     Company's ability to continue the commercialization of that drug.

           Changes in Health Care. The health care system in the United States
     is undergoing changes which may result in significant changes in the
     availability, delivery, pricing and payment and market acceptance for
     health care products and services, including the Company's products.
     Various state agencies also have undertaken or are considering significant
     health care reform initiatives. Although it is not possible to predict the
     exact manner and the extent to which the Company will be affected by such
     changes, it is likely that the Company will be affected in some fashion,
     and that legislative, administrative and market initiatives might have a
     material and adverse effect on the Company.

           Nature of License Agreements. The Company has contractual rights to
     market drugs through various licensing agreements which are terminable for
     cause upon short notice. There can be no assurance that such agreements
     will not be so terminated and, if so terminated, that the Company will be
     able to enter into similar agreements on terms as favorable to the Company
     as those contained in its current licensing agreements. Further,

                                       6
<PAGE>
 
     there can be no assurance that the Company will be able to enter into
     similar agreements for additional products in the future. Most of the
     license agreements that the Company has entered into are exclusive
     arrangements, although with regard to one of its drugs, PALA Disodium Salt,
     one of the Company's licenses for the United States is non-exclusive and
     therefore its value may be limited.

           Limited Proprietary and Contractual Rights. A number of drugs of the
     Company have limited time remaining on their United States patent
     applications. Three of the Company's drugs have been granted orphan drug
     status for specific indications. The Company has been granted a U.S. Patent
     on a method of manufacturing Ethyol and the resulting thermally stable,
     sterile, crystalline Ethyol. A continuation patent application is pending
     in the U.S. which claims crystalline forms of Ethyol independent of the
     process by which they are made. Counterpart foreign applications are also
     pending. There can be no assurance that patents will issue from this
     continuation application or any of the foreign counterpart applications.
     There can be no assurance that the Company will ever develop proprietary
     drugs that are patentable, that any issued patents will provide the Company
     with any competitive advantages or will not be challenged by any third
     parties, or that the patents of others will not have an adverse effect on
     the ability of the Company to do business. Furthermore, there can be no
     assurance that others will not independently develop similar drugs and
     related therapies, duplicate any of the Company's drugs or, if patents are
     issued to the Company, design around the patented aspects of any drugs
     developed or licensed by the Company. Similar considerations apply with
     respect to patents in foreign countries.

           The Company relies on secrecy to protect technology where patent
     protection is not believed to be appropriate or obtainable. The Company has
     entered into confidentiality agreements with certain of its employees, as
     well as certain of its consultants, licensors, licensees and distributors.
     However, there can be no assurance that secrecy obligations will be honored
     or that others will not independently develop similar or superior
     technologies. If the Company is unable to maintain the proprietary nature
     of its drugs, the Company's financial condition and results of operations
     could be adversely affected.

           Doing Business Abroad. The Company conducts business with respect to
     certain of its drugs through operations in Western Europe and has
     established its European office through its United Kingdom subsidiary and
     in 1993 purchased a manufacturing facility in Nijmegen, The Netherlands. No
     assurance can be given, however, that the Company will be able to
     successfully establish these or any other foreign operations. In addition,
     the Company has entered into arrangements with other entities for
     development and marketing of its drugs in foreign countries. There can be
     no assurance that necessary foreign regulatory approvals for the products
     under pending applications will be obtained or that the marketing of
     products pursuant to such arrangements will be commercially successful. In
     addition, the Company's retention of certain of its foreign rights is
     dependent upon the ability of the Company to meet certain minimum sales
     requirements for drugs covered by such rights. There is no assurance that
     such requirements will be met.

           Doing business in foreign countries involves certain risks not
     ordinarily associated with doing business domestically. Such risks include
     the possible imposition of exchange controls or other governmental laws or
     restrictions. These could adversely affect the Company's ability to develop
     and market drugs in a particular country. In addition, since marketing in
     foreign countries generally will involve currencies other than the U.S.
     dollar, changes in foreign currency exchange rates may adversely affect the
     prices, and therefore the sales, of the Company's drugs, as well as the
     Company's results of operations and financial position. The Company might
     also have greater difficulty enforcing its rights in foreign courts than in
     courts in the United States.

           Dependence on Third Parties for Manufacturing. In 1993 the Company
     purchased a small volume parenteral (SVP) manufacturing facility in
     Nijmegen, The Netherlands, to manufacture the Company's injectable drug
     products. The facility received regulatory approval from the Dutch
     regulatory authority in June 1994 to manufacture the Company's products for
     distribution in the European Community, and the facility was approved by
     the FDA to manufacture NeuTrexin for the U.S. market in May 1995. The
     Company manufactures its finished

                                       7
<PAGE>
 
     products Ethyol and NeuTrexin for European distribution, and NeuTrexin for
     United States distribution, in the Nijmegen facility. The use of the plant
     for the manufacture of Ethyol for the United States market, however, is
     subject to Food and Drug Administration regulatory approval which has not
     been received and there can be no assurance that such approval will be
     received. Additionally the plant's economic benefit to the Company at the
     present time is dependent on significant plant capacity being filled by
     third party contract manufacturing work. Currently two pharmaceutical
     companies contract to have products made in this facility. There can be no
     assurance that contract manufacturing for third parties at the Company's
     Nijmegen manufacturing facility will bring meaningful revenue to the
     Company.

           Even if the Nijmegen plant is approved for the manufacture of Ethyol
     for the United States market, the Company will still rely on outside
     manufacturers for drug substance and, to some degree, for drug products. In
     the event that the Company is unable to obtain or retain such outside
     manufacturing, it may not be able to commercialize its drugs as planned.
     The manufacture of the Company's drugs will be subject to then current Good
     Manufacturing Practices ("GMP") prescribed by the FDA or other standards
     prescribed by the appropriate regulatory agency in the country of use. The
     Company has contracted for the manufacture of Hexalen and U.S. market
     supplies of Ethyol from third parties for commercial sale and FddA for
     clinical trials. The Company believes that its drugs are manufactured in
     conformity with GMP or other regulatory standards affecting manufacturing
     in each country of use. There can be no assurance that the Company will be
     able to enter into agreements for its other products under development with
     manufacturers or that any such manufacturer will continue to comply with
     such standards. The Company will be dependent on such manufacturers for
     continued compliance with GMP standards. The Company's dependence upon
     third parties for the manufacture of its drugs may adversely affect future
     profit margins, if any, on the sale of its drugs and the Company's ability
     to develop and deliver products on a timely and competitive basis.

           Competition. The Company is engaged in a business that is highly
     competitive. Competitors include pharmaceutical companies with recognized,
     well established cancer therapies and therapies for PCP and biotechnology
     firms with competing therapies. Many of these companies have substantially
     greater financial, technical, manufacturing, marketing and other resources
     than the Company and may be better equipped than the Company to develop,
     market and manufacture these therapies. No assurance can be given that
     drugs developed by the Company will be able to compete against therapies
     already established in the marketplace or against therapies which may
     result from advances in biotechnology or other forms of therapy that may
     render the Company's drugs less competitive or obsolete. In addition, many
     such companies have extensive experience in undertaking pre-clinical
     testing and clinical trials and obtaining FDA and other regulatory
     approvals.

           Third Party Payors. The Company's initial strategy has been to
     accelerate the regulatory review process by concentrating on attempting to
     obtain regulatory approval of its therapies for particular types of cancer
     ("indications"). Although physicians may prescribe FDA-approved therapies
     for indications other than those approved by the FDA, it is the policy of
     many third-party payors, such as government and private insurance plans,
     with certain exceptions, not to reimburse payments for therapies for non-
     approved indications. Therefore, there can be no assurance that such policy
     will not have an adverse effect on the number of prescriptions written for
     the Company's drugs or the number of pharmacists willing to stock the
     Company's products.

           Product Liability Insurance. The Company's therapies may be
     carcinogenic or toxic. The testing and sale of human health care products
     by the Company entails an inherent risk that product liability claims may
     be asserted against the Company. The Company currently carries product
     liability coverage in the aggregate amount of $5,000,000 per policy year.
     The Company believes such coverage is commercially reasonable in light of
     its current operations, although there can be no assurance that such
     coverage will ultimately be adequate. As the Company expands the scope of
     its clinical testing and marketing of its products, the Company will be
     exposed to far greater potential liabilities. The pharmaceutical industry
     has experienced difficulty in maintaining product liability insurance
     coverage at reasonable levels, and substantial increases in insurance
     premium costs may render coverage

                                       8
<PAGE>
 
     economically impractical. Although the Company will seek to carry
     reasonable levels of product liability insurance, it is not certain that
     such coverage can be obtained on reasonable terms or, if obtained, that
     such amounts ultimately will prove adequate or that such coverage will be
     renewable for any period. If any product liability claim against the
     Company were sustained, the Company's business and future prospects could
     be materially adversely affected.

           Possible Volatility of Securities Prices. There has been significant
     volatility in the market price of securities of the Company and in the
     securities of other similar companies. Various factors and events,
     including without limitation, announcements by the Company or its
     competitors, new product developments, governmental approvals, regulations
     or actions, possible health care reform, developments or disputes relating
     to patents or proprietary rights and public concern over the safety of
     therapies all contribute to volatility and may have a significant impact on
     the Company's business and on the market price of the Common Stock.

           Dividend Policy. The Company has paid no dividends on its Common 
     Stock to date. The payment of cash dividends on the Common Stock is
     unlikely for the foreseeable future.

                                       9
<PAGE>
 
                                 RECENT EVENTS

           The Private Placement was consummated in December 1995. Pursuant to
     the Private Placement the Company (1) sold a total of 1,120,112 Shares to
     two of the three Selling Stockholders, for an aggregate purchase price of
     $3.5 million, and (2) issued the $16.5 million of Notes to the three
     Selling Stockholders for an aggregate purchase price of $16.5 million, for
     a total financing of $20 million. The Notes are payable on December 6, 1998
     and bear interest at the rate of 4% per annum. One-third of the $16.5
     million principal amount of the Notes becomes convertible 15 days after the
     date of this Prospectus, another one-third of the principal amount becomes
     convertible 45 days after the Prospectus date and the final one-third
     becomes convertible 65 days after the Prospectus date. The conversion price
     is 82.5% of the average market price for the Common Stock for the five
     consecutive trading days ending one trading day prior to the date that the
     conversion notice is received by the Company. The Company has the right to
     prepay the Notes upon payment of a 21.21% premium. The Company also has the
     right to require the investors to convert the Notes, which right the
     Company can exercise at any time or from time to time starting 65 days
     after the Prospectus date. The net proceeds of the Private Placement were
     added to the Company's working capital. See "Selling Stockholders" for
     additional information about the Notes.

                              SELLING STOCKHOLDERS

           The following table lists, for each Selling Stockholder, (i) the
     Selling Stockholder's name, (ii) the number of Shares purchased in the
     Private Placement and owned immediately prior to the offering described
     herein, and (iii) the maximum number of Shares that can be acquired
     pursuant to the Notes. All of such Shares are covered for resale by this
     Prospectus. None of the Selling Stockholders had any affiliation with the
     Company prior to the Private Placement.
<TABLE>
<CAPTION>
 
                                                                   Maximum
                                          Number of                Number of Shares
                                          Shares Owned             to be Acquired
     Names of Selling Stockholders(1)     Prior to Offering(2)     Pursuant to Notes(3)(4)
     ---------------------------------    --------------------     -----------------------
     <S>                                  <C>                      <C>
                                       
     GFL Advantage Fund Limited             640,064                2,979,228
                                                                  
     GFL Performance Fund Limited           480,048                1,489,614
                                                                  
     Genesee Fund Limited - Portfolio B           0                2,553,624
                                          ---------                ---------
                                          1,120,112                7,022,466
                                          =========                =========

</TABLE> 
- -------------------


       (1) The three Selling Stockholders have a common investment advisor.

       (2) Does not include Shares issuable upon conversion of the Notes. $11
           million of the Notes are convertible into Shares within 60 days of
           the date of this Prospectus and all of the Notes are convertible into
           Shares within 65 days of the date of this Prospectus.

       (3) The Selling Stockholders can receive Shares through conversion of
           their Notes or through payment by the Company of interest on the
           Notes in Shares, valued at the current market price

                                      10
<PAGE>
 
           at the time of the interest payment, at the Company's option. The
           conversion price is 82.5% of the average market price for the Common
           Stock for the five consecutive trading days ending one trading day
           prior to the date that the conversion notice is received by the
           Company. By agreement with the Selling Stockholders, the maximum
           number of Shares which the Selling Stockholders may receive pursuant
           to the Notes is 7,022,466 Shares. The number of Shares set forth in
           this column assumes that Shares received by Selling Stockholders
           pursuant to the Notes are received by them pro rata in proportion to
           the amount of their respective Notes. However, Shares issued upon
           conversion of the Notes will be issued on a first exercised, first
           issued basis, so that one Selling Stockholder could under certain
           circumstances receive the full 7,022,466 Shares and the others would
           receive none. If any Selling Stockholder is unable to convert all or
           any part of its Note because the maximum number of Shares to be
           issued pursuant to the Notes has been issued, such Selling
           Stockholder will be entitled to have the amount of its unconverted
           Note paid in full in cash together with a 21.21% premium.

       (4) If the Selling Stockholders were to receive all of the 7,022,466
           Shares that could be issued pursuant to the Notes, they would own in
           the aggregate 16.6% of the shares of Common Stock of the Company
           outstanding as of the present time, including the 1,120,112 Shares
           that they currently own.  However, the Selling Stockholders have
           agreed with the Company that they will not own in the aggregate more
           than 4.9% of the Company's outstanding Common Stock at any time.


                             PLAN OF DISTRIBUTION

           The sale of the Shares by the Selling Stockholders may be effected
     from time to time in one or more transactions (which may involve block
     transactions) on the AMEX or in the over-the-counter market, in negotiated
     transactions or by a combination of such methods of sale, at fixed prices,
     at market prices prevailing at the time of the sale, at prices related to
     the prevailing market prices or at negotiated prices.  The Selling
     Stockholders may effect such transactions with or through one or more
     broker-dealers, which may act as agent or principal.  The Selling
     Stockholder and/or any broker-dealer affecting the sales may be deemed to
     be an "underwriter" within the meaning of Section 2(11) of the Securities
     Act of 1933, and any commissions received by the broker-dealer and any
     profit on the resale of shares as principal may be deemed to be
     underwriting discounts and commissions under such Act.  The Selling
     Stockholders may transfer their Shares or their Notes to other persons who
     may, in turn, resell Shares in the manner described above.  Additionally,
     the Selling Stockholders may pledge or make gifts of their Shares and the
     Shares may also be sold by the pledgees or transferees.  The Selling
     Stockholders may also transfer their Shares pursuant to Rule 144 under the
     Securities Act of 1933, whether or not the Registration Statement of which
     this Prospectus forms a part is effective at the time of any such transfer.


                                      11
<PAGE>
 
                          DESCRIPTION OF COMMON STOCK

           The authorized capital stock of the Company presently consists of
     105,000,000 shares, consisting of 100,000,000 shares of Common Stock, and
     5,000,000 shares of Preferred Stock, $.005 par value (the "Preferred
     Stock").  At December 29, 1995, there were 42,093,890 shares of Common
     Stock and no shares of Preferred Stock outstanding.

           The holders of Common Stock are entitled to one vote for each share
     on all matters voted upon by stockholders, including the election of
     directors. Shares of Common Stock do not have cumulative voting rights,
     which means that the holders of more than 50% of such shares voting for the
     election of directors can elect 100% of the directors if they choose to do
     so and, in such event, the holders of the remaining shares so voting will
     not be able to elect any directors. Holders of Common Stock do not have any
     conversion, redemption or preemptive rights. In the event of the
     dissolution, liquidation or winding up of the Company, holders of Common
     Stock will be entitled to share ratably, together with any participating
     preferred shares then outstanding, in any assets remaining after the
     satisfaction in full of the prior rights of creditors, including holder of
     Company indebtedness, and the liquidation preference of any preferred
     shares then outstanding.

           The Company has in effect a Stockholder Rights Plan (the "Plan")
     pursuant to which a Right (as defined in the Plan) is attached to each
     share of Common Stock outstanding.  A description of the Plan and a copy of
     the Rights Agreement are contained in the Company's Current Report on Form
     8-K dated June 7, 1995 and Amendment No. 1 on Form 8-K/A to Current Report
     on Form 8-K, dated July 20, 1995 which are incorporated in this Prospectus
     by reference.

           The Common Stock is presently listed on the AMEX.

     Transfer Agent and Registrar

           Chemical Mellon Shareholder Services, of New York, New York, is the
     transfer agent and registrar for the Common Stock.

                                 LEGAL MATTERS

           Wolf, Block, Schorr and Solis-Cohen, Philadelphia, Pennsylvania, has
     rendered an opinion that (1) the 1,120,112 Shares that are currently
     outstanding are legally issued, fully paid and non-assessable, and (2) the
     remainder of the Shares, when issued in accordance with the terms of the
     Notes, either upon conversion of the Notes or as interest on the Notes,
     will be legally issued, fully paid and non-assessable.

                                    EXPERTS

           The consolidated financial statements of U.S. Bioscience, Inc.
     appearing in its Annual Report on Form 10-K for the year ended December 31,
     1994, have been audited by Ernst & Young LLP, independent auditors, as set
     forth in their report thereon included therein and incorporated herein by
     reference.  Such consolidated financial statements are incorporated herein
     by reference in reliance upon such report given upon the authority of such
     firm as experts in accounting and auditing.


                                      12
<PAGE>
 
================================================================================
No dealer, salesperson or any other person has been authorized to give any
information or to make any representations, not contained in this Prospectus, in
connection with this offering and, 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 securities other than the Shares
described in the Prospectus or an offer to sell or a solicitation of an offer to
buy such shares in any jurisdiction to any person to whom it is unlawful to make
such an offer or solicitation in such jurisdiction  The delivery of this
Prospectus at any time does not imply that the information contained herein is
correct as of any time subsequent to its date.



                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
 
                                                                           Page
                                                                           ----
<S>                                                                        <C>
 
Available Information......................................................   2
Incorporation of Certain Documents by Reference............................   2
Prospectus Summary.........................................................   4
Risk Factors...............................................................   5
Recent Events..............................................................  10
Selling Stockholders.......................................................  10
Plan of Distribution.......................................................  11
Description of Common Stock................................................  12
Legal Matters..............................................................  12
Experts....................................................................  12
</TABLE>
================================================================================

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


                                8,142,578 Shares

                             U.S. Bioscience, Inc.

                                  Common Stock
                               ($0.005 par value)



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

                                   PROSPECTUS

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



                                January   , 1996


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

                     INFORMATION NOT REQUIRED IN PROSPECTUS


     Item 14.  Other Expenses of Issuance and Distribution.

           The fees and expenses in connection with the issuance and
     distribution of the securities being registered hereunder are estimated as
     follows:

<TABLE>
<CAPTION>
 
           <S>                                                      <C>
           Commission registration fee...........................   $13,425
           American Stock Exchange listing fee...................    17,500
           Legal fees and expenses...............................    20,000
           Accounting fees and expenses..........................     5,000
           Blue Sky fees and expenses............................     2,500
           Miscellaneous.........................................     1,575
                                                                    -------
 
                    Total........................................   $60,000
                                                                    =======
 
</TABLE>
     Item 15.  Indemnification of Directors and Officers.

           Generally, Section 145 of the General Corporation Law of the
     State of Delaware (the "DGCL") provides that directors and officers of
     Delaware corporations are entitled, under certain circumstances, to be
     indemnified against all expenses and liabilities (including attorneys'
     fees) incurred by them as a result of any suit brought against them in
     their capacity as a director or officer, if they acted in good faith and in
     a manner they reasonably believed to be in or not opposed to the best
     interests of the corporation, and, with respect to any criminal action or
     proceeding, if they had no reasonable cause to believe their conduct was
     unlawful.  A director or officer may also be indemnified against expenses
     incurred in connection with a derivative suit if such director acted in
     good faith and in a manner reasonably believed to be in or not opposed to
     the best interests of the corporation, except that no indemnification may
     be made without court approval if such person was adjudged liable to the
     corporation.  Article Six of the Company's Certificate of Incorporation
     entitles officers and directors of the Company to indemnification to the
     full extent permitted by the DGCL, as the same may be supplemented or
     amended from time to time.  In addition, Article Eight of the Company's
     Certificate of Incorporation limits a director's liability to the Company
     or to any stockholder for monetary damages for certain breaches of
     fiduciary duty as a director.

           The Registrant maintains directors' and officers' liability
     insurance to cover its officers and directors against certain liabilities
     they may occur when acting in their capacity as directors or officers.


                                     II-1
<PAGE>
 
     Item 16.  Exhibits.

     Exhibit
     -------

      3.1    Restated Certificate of Incorporation (incorporated by reference to
             Exhibit 3(a) to the Registrant's Registration Statement on Form S-1
             (File No. 33-39576), filed with the Commission on March 22, 1991)

      3.1.1  Certificate of Amendment to Certificate of Incorporation

      3.1.2  Certificate of Designations of Series A Junior Preferred Stock
             (incorporated by reference to Exhibit 1 to the Registrant's Current
             Report on Form 8-K dated June 7, 1995)

      3.2    By-laws, as amended (incorporated by reference to Exhibit 3.2 to
             the Registrant's Report on Form 10-K for the fiscal year ended
             December 31, 1993)

      5      Opinion and Consent of Wolf, Block, Schorr and Solis-Cohen as to
             the legality of the Common Stock

     23.1    Consent of Ernst & Young LLP

     23.2    Consent of Counsel (included in Exhibit 5.1)

     24      Power of Attorney (included on signature page)
     __________________________


     Item 17.  Undertakings.

             The undersigned registrant hereby undertakes:

                   (a)  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, as amended (the
                   "Securities Act");

                            (ii)   to reflect in the Prospectus any facts or 
                   events arising after the effective date of this 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 this
                   Registration Statement;

                            (iii)  to include any material information with
                   respect to the plan of distribution not previously disclosed
                   in this Registration Statement or any material change to such
                   information in this Registration Statement;

                                     II-2
<PAGE>
 
               provided, however, that the undertakings set forth in paragraphs
               (i) and (ii) above do not apply if 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 (the "Exchange Act") that are incorporated by reference in
               this Registration Statement.

                   (b) That, for the purpose of determining any liability under
               the Securities Act, 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.

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

                   (d) 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 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 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.

                   (e) Insofar as indemnification for liabilities arising under
               the Securities Act may be permitted to directors, officers and
               controlling persons of the registrant pursuant to the provisions
               referred to in Item 15 of this registration statement, 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 such 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 hereby, 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 such 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 certifies that it has reasonable grounds to believe that it
     meets all of the requirements for filing on Form S-3 and has duly caused
     this Registration Statement to be signed on its behalf by the undersigned,
     thereunto duly authorized, in the city of West Conshohocken, State of
     Pennsylvania, on January 3, 1996.

                                                 U.S. BIOSCIENCE, INC.


                                                 By:_____________________
                                                   Robert I. Kriebel
                                                   Senior Vice President



               Each person whose signature appears below constitutes  and
     appoints Philip S. Schein, Robert I. Kriebel and Martha E. Manning, and
     each of them, such person's true and lawful attorneys-in-fact and agents,
     with full power of substitution and resubstitution, for such person and in
     such person's name, place and stead, in any and all capabilities, to sign
     any and all amendments to this Registration Statement, and to file the
     same, with all exhibits thereto, and other documentation in connection
     therewith, with the Securities and Exchange Commission, granting unto said
     attorneys-in-fact and agents full power and authority to do and perform
     each and every act and thing requisite and necessary to be done in and
     about the premises, as fully to all intents and purposes as such person
     might or could do in person, hereby ratifying and confirming all that said
     attorneys-in-fact and agents, or their substitute or substitutes, may
     lawfully do or cause to be done by virtue hereof.

                                     II-4
<PAGE>
 
          Pursuant to the requirements of the Securities Act of 1933, this
     Registration Statement has been signed by the following persons in the
     capacities and on the date below indicated.

<TABLE>
<CAPTION>
          Signature                                  Title                             Date
          ---------                                  -----                             ----
     <S>                                <C>                                          <C> 
     /s/ Philip S. Schein               Principal Executive Officer and Director     December 24, 1995
     ----------------------                                               
     Philip S. Schein, M.D.


     /s/ Robert I. Kriebel              Principal Financial Officer and Director     December 24, 1995
     ---------------------                                                      
     Robert I. Kriebel


     /s/ Mark R. Bausinger              Principal Accounting Officer                 January 2, 1996
     ---------------------                                                   
     Mark R. Bausinger


     /s/ Robert L. Capizzi              Director                                     January 2, 1996
     -----------------------                                  
     Robert L. Capizzi, M.D.


     /s/ Paul Calabresi                 Director                                     December 27, 1995
     ------------------                                                        
     Paul Calabresi, M.D.


     /s/ Betsey Wright                  Director                                     December 30, 1995
     -----------------                                                         
     Betsey Wright


     /s/ Allen Misher                   Director                                     December 23, 1995
     -------------------                                        
     Allen Misher, Ph.D.


     /s/ Jonah Shacknai                 Director                                     December 27, 1995
     ------------------                                         
     Jonah Shacknai


     /s/ Douglas J. MacMaster, Jr.      Director                                     January 2, 1996
     -----------------------------                                           
     Douglas J. MacMaster, Jr.

</TABLE> 

                                     II-5
<PAGE>
 
                                 EXHIBIT INDEX
<TABLE> 
<CAPTION> 

                                                                                              Page Numbers
                                                                                           in Sequentially
                                                                                         Numbered Document
                                                                                         ----------------- 
     Exhibit
     -------
<C>    <S>                                                                               <C> 
3.1    Restated Certificate of Incorporation (incorporated by reference to
       Exhibit 3(a) to the Registrant's Registration Statement on Form S-1
       (File No. 33-39576), filed with the Commission on March 22, 1991) ..........

3.1.1  Certificate of Amendment to Certificate of Incorporation....................

3.2.1  Certificate of Designations of Series A Junior Preferred Stock
       (incorporated by reference to Exhibit 1 to the Registrant's Current
       Report on Form 8-K dated June 7, 1995)......................................

3.2    By-laws, as amended (incorporated by reference to Exhibit 3.2 to
       the Registrant's Report on Form 10-K for the fiscal year ended
       December 31, 1993)..........................................................

5      Opinion and Consent of Wolf, Block, Schorr and Solis-Cohen as to
       the legality of the Common Stock............................................

23.1   Consent of Ernst & Young LLP................................................

23.2   Consent of Counsel (included in Exhibit 5.1)................................

24     Power of Attorney (included on signature page)..............................

</TABLE> 

<PAGE>
 
                                                                   Exhibit 3.1.1

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                             U.S. BIOSCIENCE, INC.


     U.S. BIOSCIENCE, INC., a corporation organized and existing under and by
     virtue of the General Corporation Law of the State of Delaware,

     DOES HEREBY CERTIFY:

     FIRST:  That at a meeting of the Board of Directors of U.S. Bioscience,
     Inc. resolutions were duly adopted setting forth a proposed amendment of
     the Certificate of Incorporation of said corporation, declaring said
     amendment to be advisable and calling a meeting of the stockholders of said
     corporation for consideration thereof.  The resolution setting forth the
     proposed amendment is as follows:

          RESOLVED, that the first paragraph of Article Four of this
          Corporation's Certificate of Incorporation be and it hereby is amended
          to read in its entirety as follows:

               "The aggregate number of shares which the Corporation shall have
               authority to issue shall be  105,000,000 shares consisting of
               100,000,000 shares of Common Stock, par value $.005 per share,
               and 5,000,000 shares of Preferred Stock, par value $.005 per
               share."

     SECOND:  That thereafter, pursuant to resolution of its Board of Directors,
     the proposed amendment was considered at the next annual meeting of
     stockholders, which annual meeting of stockholders was duly called and
     held, upon notice in accordance with Section 222 of the General Corporation
     Law of the state of Delaware and at such meeting the necessary number of
     shares as required by statute were voted in favor of the amendment.

     THIRD:  That said amendment was duly adopted in accordance with the
     provisions of Section 242 of the General Corporation Law of the State of
     Delaware.


     IN WITNESS WHEREOF, said U.S. BIOSCIENCE, INC. has caused this certificate
     to be signed by  Russell C. McLauchlan, its President, and  Kenneth R.
     Lynn, its Secretary, this 29th day of May, 1992.

                               U.S. BIOSCIENCE, INC.



                               BY:/s/ Russell C. McLauchlan
                                  ---------------------------
                                          President


                               ATTEST: /s/ Kenneth R. Lynn
                                       --------------------------
                                              Secretary

<PAGE>
 
                                  LAW OFFICES

                      WOLF, BLOCK, SCHORR and SOLIS-COHEN
                         Twelfth Floor Packard Building
                     S.E. Corner 15th and Chestnut Streets
                          Philadelphia, PA 19102-2678
                                        

                                                                       EXHIBIT 5
  (215) 977-2188

                                January 4, 1996



      U.S. Bioscience, Inc.
      One Tower Bridge
      100 Front Street
      West Conshohocken, PA 19428

          Re:  Registration Statement on Form S-3
               ----------------------------------

      Gentlemen:

          As counsel for U.S. Bioscience, Inc., a Delaware corporation (the
      "Company"), we have reviewed a Registration Statement on Form S-3 (the
      "Registration Statement") prepared in connection with the proposed resale
      from time to time of (i) up to  1,120,112 shares (the "Issued Shares") of
      the Company's Common Stock, par value $.005 per share ("Common Stock"),
      issued to the stockholders listed under the heading "Selling Stockholders"
      in the Registration Statement concurrently with the Company's December
      1995 private placement of Convertible Notes due December 6, 1998 (the
      "Notes"), and (ii) up to 7,022,466 shares of Common Stock (the "Unissued
      Shares") issuable upon the conversion of the Notes or issued in payment of
      interest on the Notes (together with the Issued Shares, the "Securities").

          In connection therewith, we have examined the originals or copies,
      certified or otherwise identified to our satisfaction, of such records,
      instruments, documents and matters of law as we have deemed necessary or
      appropriate for the purpose of rendering this opinion.

          In our examination of documents, instruments and other papers, we have
      assumed the genuineness of all signatures on original and certified
      documents and the conformity to original and certified documents of all
      copies submitted to us as conformed, photostatic or other copies.  As to
      matters of fact which have not been independently established, we have
      relied upon representations of officers of the Company.

          In rendering this opinion, we have assumed that there will be no
      changes in applicable law between the date of this opinion and any date of
      issuance or delivery of the Securities.
<PAGE>
 
U.S. Bioscience, Inc.
January 4, 1996
Page 2

          Based upon the foregoing, it is our opinion that:

          1.   The Issued Shares have been duly authorized and are legally
      issued, fully paid and non-assessable; and

          2.   The Unissued Shares have been duly authorized and, when and if
      duly issued in accordance with the terms of the Note, such shares of
      Common Stock will be legally issued, fully paid and non-assessable.

          In connection with our opinions above, we have assumed that, at the
      time of resale of the Securities, all contemplated additional actions
      shall have been taken, the authorization of the Securities will not have
      been modified or rescinded, and there will not have occurred any change in
      law affecting the validity of the Securities.

          We hereby consent to the reference to our firm in the Registration
      Statement under the Prospectus caption "Legal Matters" and to the
      inclusion of this opinion as an exhibit to the Registration Statement.

                                      Very truly yours,


                           /s/ Wolf, Block, Schorr and Solis-Cohen
 

                           WOLF, BLOCK, SCHORR AND SOLIS-COHEN

<PAGE>
 
                                                                    Exhibit 23.1



                        CONSENT OF INDEPENDENT AUDITORS



   We consent to the reference to our firm under the caption "Experts" in the
   Registration Statement (Form S-3 No. 33-00000) for the registration of
   8,142,578 shares of common stock of U.S. Bioscience, Inc. and to the
   incorporation by reference therein of our report dated February 21, 1995,
   with respect to the consolidated financial statements of U.S. Bioscience,
   Inc. included in its Annual Report on Form 10-K for the year ended December
   31, 1994, filed with the Securities and Exchange Commission.

                                      /s/ Ernst & Young LLP

                                      ERNST & YOUNG LLP



      Philadelphia, Pennsylvania
      January 5, 1996


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