EXHIBIT 10.44

                            CO-PROMOTION AGREEMENT

                                    BETWEEN

                                  MILES INC.

                                      AND

                          SCHEIN PHARMACEUTICAL, INC.

 
                            Co-Promotion Agreement
                       
This Agreement is made and effective as of the 1st day of August, 1994,
(hereinafter referred to as the "Effective Date"), by and between Miles Inc., a
corporation of the State of Indiana (hereinafter "Miles") and Schein
Pharmaceutical, Inc. a corporation of the State of Delaware
(hereinafter "Schein").

WHEREAS, Schein is the holder of an NDA covering a pharmaceutical product
marketed by Schein under the brand name INFeD(R) (iron dextran injection, U.S.P.
50 mg/ml) (hereinafter "Product") indicated for treating iron deficiency, and
Schein desires to enhance market share of Product in the United States
pharmaceutical market place; and

WHEREAS, Miles has considerable knowledge in promoting, detailing and marketing
pharmaceutical products in the United States and has in place a large, well-
experienced detailing force; and

WHEREAS, Miles and Schein believe that a joint promotion and detailing
arrangement regarding Product would be desirable and fully compatible with each
party's business objectives.

NOW, THEREFORE, for and in consideration of the mutual covenants contained
herein, Miles and Schein hereby agree as follows:

Article I: Definitions
- ----------------------

1.01      "Affiliate" shall mean:

          (a) An organization which owns, directly or indirectly, a controlling
              interest in Miles or Schein by stock ownership or otherwise; or
              
          (b) An organization having its majority ownership directly or
              indirectly common to the majority ownership of Miles or Schein.
              
1.02      "Product" shall mean iron dextran injectable.

1.03      "United States" shall mean the United States of America.


                                      -1-

 
1.04     "Net Sales" shall mean *** ******* ***** ****** ** *********** *****
         ******* ** ****** **** *** ********* ******** ******** ** ************
         ******* ****** *** *** *********** **** ******* ** *** ******* ** ***
         ****** ******* **** ***** ********** ************ ****** **************
         ***** ******* ** ********** ********* ***** ******* ** ******* ** *****
         ************ ******* ** ******** ** **** ******** ** *******
         ************* ***************
         
1.05     "Threshold Value" with respect to a Detailing Year shall mean the
         dollar amount specified for such year under Article III.
         
1.06     "Joint Detailing Years" shall mean the period of time commencing on
         the Effective Date of this Agreement and ending on the last day of the
         Third Detailing Year, subject to extension or termination in accordance
         with Section 4.12 and Article VIII. A "Detailing Year" shall be the
         twelve (12) month period commencing on each August 1st of the Term.
         
1.07     "Promotional Costs" shall mean all out-of-pocket costs incurred by
         Schein in the marketing and promotion of the Product, including without
         limitation in the development and production of promotional materials,
         but excluding costs associated with sales representatives and
         administrative overhead.
         
1.08     "Standard Cost" shall mean ******** *** *** ************ ************* 
         ******** ****** ********* *** ** ********** **** **** **********
         ******* *** ********* ******** ********** ********** ************
         ******** ************ *** ** ********
         
1.09     "Confidential Information" shall mean information which relates to the
         Product, including financial statements, costs and expense data,
         production data, trade secrets, secret processes and formulae,
         marketing and consumer data or any other information which is not
         generally ascertainable from public or published information,
         regardless of whether such information was provided pursuant to the
         terms of this Agreement, by request of the other party or in any other
         manner. Schein reserves the right to limit the disclosure to Miles of
         any Confidential Information which, in the sole opinion of Schein, is
         not necessary to achieve the purposes of this Agreement.
         
1.10     In the terms defined herein, the singular shall include the plural and
         vice versa.
         ---- -----         

* redacted pursuant to confidential treatment request.

                                      -2-

 
Article II: Grants and Obligations
- ----------------------------------

2.01     Schein hereby grants to Miles during the Joint Detailing Years the
         right to promote and detail the Product in the United States jointly
         with Schein in accordance with the provisions of this Agreement.
          

         During the Joint Detailing Years, Schein shall not authorize, or grant
         the right to, any third party to detail the Product in the United
         States.
          
2.02     (a)  During the Joint Detailing Years, Miles will be diligent in its
              efforts consistent with its customary business practices and legal
              requirements to deploy its sales force to promote and detail
              throughout the United States the Product in such manner and with
              such expedition as Miles itself would have adopted in promoting
              and detailing a pharmaceutical product of its own invention.
              During the Joint Detailing Years and for a period of one (1) year
              thereafter, Miles will not promote or detail any pharmaceutical
              product with indications similar to those of the Product.
              
         (b)  The Product will be presented in a primary position in at least
              fifty percent (50%) of Miles' sales representative calls to
              dialysis centers and nephrologists and in no less than a secondary
              position in the remainder of such calls.
              
2.03     During the Joint Detailing Years, Schein will be diligent in its
         efforts consistent with its customary business practices and legal
         requirements to promote and market the Product throughout the United
         States. Notwithstanding the foregoing, the parties acknowledge that it
         is Schein's present intention that Schein's brand sales representatives
         will continue to promote the Product, and Schein will reassign its
         other sales representatives to promote products other than the Product.


                                      -3-

 
Article III: Payments
- ---------------------

3.01     (a)  Schein shall pay to Miles in each Detailing Year amounts equal to
              ***** ******* ***** of the Incremental Net Profit.
              
              Incremental Net Profit is calculated as:
              
              *** ***** ** ******* **** ********* ***** **** ************ *****
              ******* *** *** ********** ********* **** **** *** *** ** ***
              ******** **** ********** ** *** ****** ** ***** ** *******
              ********** *** *********** ***** ****** *** **** ** ****** ***
              ************ ***** ***** ** *** ******* **** ** *** ***********
              ***** ****** *** ***** *** ******* ** **** ** *********** *****
              **** **** *********** ******
              
              Net to be split by parties (50/50)
              
         (b)  The Threshold Value for each Detailing Year shall be as follows:
         
              ********* ****        ********* *****         **** ***********
              **************        ***************         **************** 
                                     ***** ********              *****
                                     **************              *****

                 *****                ***********              **********
                 ******                **********               *********
                 *****                 **********               *********
              
         (c)  Within sixty (60) days prior to the start of the second Detailing
              Year and each Detailing Year thereafter, Schein and Miles will
              meet for the purposes of reviewing the Threshold Value (and
              applicable Base Promotional Costs) for the coming Detailing Year
              and negotiating in good faith any appropriate adjustment to the
              Threshold Value (and applicable Base Promotional Costs) for
              reasons including, but not limited to, the effect of a competitive
              product in the market, and additional indications or delivery
              systems for the Product.
              
         (d)  Within thirty (30) days after the close of each quarter during
              each Detailing Year, Schein shall remit to Miles all payments
              accruing under this Article during such quarter. The payment shall
              be accompanied by an accounting reporting for such quarter Net
              Sales both as to aggregate quantities and dollar amounts of such
              Net Sales of the Product subject to payments hereunder for such
              quarter.
              

              *redacted pursuant to confidential treatment request.
                                      -4-

 
Article IV: Cooperation, Rights and Responsibilities
- ----------------------------------------------------

It is among the objectives of the parties to jointly promote and detail the
Product in the United States in the most effective and efficient fashion during
the Joint Detailing Years. To achieve this objective, the parties agree, during
the Joint Detailing Years, as follows:

4.01     The parties shall each appoint an authorized representative
         ("Coordinator") between whom communications will be directed. Each
         party will notify the other as to the name of the individual so
         appointed. Each party may replace its Coordinator at any time, upon
         written notice to the other party.
         
4.02     (a)  The Coordinators shall establish a team ("Team") directed by the
              Coordinators and consisting of representatives of each party which
              will meet from time to time, at mutually agreeable times and
              locations, to discuss and coordinate the joint promotion and
              detailing of the Product in the United States and the strategies
              and programs that should be developed to maximize Net Sales of the
              Product. Illustratively, the Team shall:

              (i)  guide all continuing joint promotion and detailing efforts
                   with respect to the Product in the United States. Schein will
                   have the final authority and responsibility, with the
                   cooperation and assistance of Miles, for developing
                   detailing, marketing and promotional strategies and other
                   matters with respect to the Product, and Schein shall have
                   the final right of approval for all such strategies and other
                   matters.
                   
         (b)  From time to time, but in no event less than once a year, the Team
              shall develop and formulate joint marketing plans for specified
              periods (collectively the "Marketing Plan") which shall set forth
              detailing, promotion and marketing strategies relating to the
              Product. The marketing planning process shall be a joint effort
              under the leadership and authority of Schein. The provisions of
              the Marketing Plan shall be agreed to by the Coordinators, and if
              the Coordinators cannot agree, then the matters in dispute shall
              be referred to the President of Miles Pharmaceutical Division and
              the Chairman of Schein. Schein, however, shall have the final
              responsibility for, and control over, and the final right of
              approval for, the development and content of the Marketing Plan.
              Schein retains the right to determine in its discretion the
              appropriate manner and timing of execution of all marketing and
              promotional plans and strategies, including without limitation the
              selection of ad agencies, the development and production of
              promotional materials.


                                      -5-

 
         (c)  A party shall have the right to comment upon and make
              recommendations to the other party regarding the other party's
              activities under this Agreement, which recommendations the other
              party shall thoroughly evaluate and consider.
               
         (d)  Each party shall bear its own costs associated with its
              participation in the Team and associated with its detailing,
              marketing and promotional activities under this Agreement, except
              as provided in Section 3.01.
               
4.03     (a)  During the Joint Detailing Years and subject to any other
              provision of this Agreement, each party will provide the other
              with all information which the disclosing party deems significant
              and relevant to the detailing and promotion of the Product within
              a reasonable time after such information becomes known to the
              party, provided such information is not received under a secrecy
              obligation. Within thirty (30) days after the close of each
              quarter during each Detailing Year, Miles will provide to Schein a
              report of Miles Product detail call activity by medical specialty
              for the quarter then ended, along with a summary of feedback from
              Miles sales representatives concerning their detailing efforts for
              that quarter.

         (b)  During the Joint Detailing Years, each party shall promptly notify
              the other party of all information coming into its possession
              concerning unexpected side effects, injury, toxicity or
              sensitivity reactions as provided in Appendix I hereto.
              
4.04     Schein shall retain all proprietary and property interests in the
         Product until the point of sale and in all supporting sales and
         promotional material. Miles will not have nor represent that it has any
         control or proprietary or property interests in the Product or in any
         sales or promotional material. Nothing contained herein shall be deemed
         to grant Miles, either expressly or impliedly, a license or other right
         or interest in any patent, trademark or other similar property of
         Schein or its Affiliates except as may be necessary for Miles to
         promote and detail the Product as provided in this Agreement. Miles
         acknowledges that Schein shall retain all copyrights in and to all
         sales, promotional and training materials created or used in connection
         with the promotion of the Product.

4.05     (a)  Miles shall not be required to distribute any sales and
              promotional material which:


                                      -6-

 
              (i)   does not present Product to the Medical and paramedical
                    communities and to the trade as joining with Schein in the
                    detailing and promotion of the Product; and
                    
              (ii)  does not mention the Product; or
               
              (iii) includes reference to another Schein pharmaceutical in
                    addition to the Product. At Schein's request and at Miles'
                    sole option, Miles may distribute sales and promotion
                    material of the type identified in this subsection (a).
                    Should Miles elect to distribute such material, it shall be
                    supplied to Miles by Schein free of all charge. Schein shall
                    not be require to distribute any sales and promotion
                    material which contains a reference:
                    
                    (1) to Miles (other than in connection with the joint
                        detailing and promotion of the Product in accordance
                        with this Agreement); or
                        
                    (2) any Miles pharmaceutical. All materials distributed by
                        Schein promoting the Product during the Joint Detailing
                        years and intended to be part of the co-promotion
                        arrangement covered by this Agreement shall mention
                        Miles as the joint promoter of the Product.
                        
         (b)  During the Joint Detailing Years, Schein shall also provide Miles,
              at Schein's cost, with reasonable quantities of training materials
              which have been created and developed by Schein relating to the
              Product. Miles shall have the responsibility for, and control
              over, the manner in which it trains its sales force with respect
              to the Product.
              
4.06     In implementing the obligations contained in Article II, each party
         shall have sole discretion as to the manner (which shall not be
         inconsistent with the Marketing Plan, and provided that Miles will not
         utilize any promotional materials not created by Schein) in which it
         promotes and details (including any expenditure of funds in connection
         therewith) the Product in the United States. Each party shall bear its
         own costs incurred in the performance of any obligations hereunder,
         subject to the provisions of Section 3.01. Neither party shall have any
         responsibility for the hiring, firing or compensation of the other
         party's employees or for any employee benefits. No employee or
         representative of a party shall have any authority to bind or obligate
         the other party to this Agreement for any sum or in any manner
         whatsoever, or to create or impose any contractual or other liability
         on the other party without said party's authorized written approval.
         For all
         

                                      -7-

 
         purposes, and notwithstanding any other provisions of this Agreement to
         the contrary Miles' legal relationship under this Agreement to Schein
         shall be that of independent contractor. Each party shall be
         responsible for ensuring that its promotional activities under this
         Agreement are in full compliance with all applicable laws, rules,
         regulations and orders, including without limitation applicable FDA
         regulations, and are consistent with the Product approval and package
         insert.
          
4.07     (a)   Schein shall use commercially reasonable efforts consistent with
               Schein's overall business strategy, as determined by Schein, to
               insure that sufficient stock of the Product will be available in
               its inventory to promptly fill orders from the trade in the Joint
               Detailing Years for sales of the Product in the United States.
               All orders for Products are subject to acceptance by Schein, in
               whole or in part.
               
         (b)   Prior to or upon the signing of this Agreement and at least
               thirty (30) days prior to each calendar quarter during the Joint
               Detailing Years, Miles and Schein will confer to establish a
               forecast of anticipated sales of Product by month for the
               succeeding twelve (12) month period. Such forecasts shall be made
               to assist Schein in planning its Product production and shall be
               non-binding.
               
4.08      (a)  During the Joint Detailing Years, Miles and Schein will be
               presented and described, by each party hereto, to the medical and
               paramedical communities and to the trade as joining in the
               detailing and promotion of the Product, and all written
               information (including, but not limited to, journal
               advertisements, direct mail, sales pieces and other promotional
               material) and, to the extent practicable, all oral information,
               disseminated or presented, respectively, to such communities and
               trade regarding the detailing and promoting of the Product in the
               United States will state this arrangement, if such information is
               intended to be part of the co-promotion arrangement covered by
               this Agreement. Neither party shall distribute or have
               distributed any such information which bears the name of the
               other without the prior written approval of the other, which
               approval shall not be unreasonably withheld. Nothing herein
               contained shall require the Miles name or logo to appear on the
               Product's label, container label or package insert.
               
         (b)   Each party, at its option, may issue press releases or other
               public announcements relating to the Product or the arrangement
               contemplated by this Agreement, provided, however, that;

                                      -8-

 
               (i)   neither party shall issue a press release or public
                     announcement which has, as a major focus, either the joint
                     detailing and promotion of the Product in the United States
                     or such arrangement, without the prior written approval of
                     the other party, which approval shall not be unreasonably
                     withheld; and
                   
               (ii)  all other press releases and public announcements will
                     describe the Product and the arrangement contemplated by
                     this Agreement in a manner consistent with those releases
                     and announcements previously approved by the other party.
                   
4.09     (a)  Schein shall have the sole right and responsibility for, and shall
              bear all costs related to, obtaining and maintaining the
              authorization and/or ability to market a pharmaceutical product in
              the United States including, without limitation, the following:
              
              (1)  Responding to Product and medical complaints relating to the
                   Product. Miles agrees that it shall refer any such complaints
                   which it receives to Schein in accordance with Appendix I
                   hereto;
                   
              (2)  All Product returns must be authorized by Schein. Miles shall
                   not solicit or accept any returns of Product and shall advise
                   the customer that Product is to be returned to Schein. If
                   despite the foregoing any Product is returned to Miles, then
                   it shall be shipped to Schein's nearest distribution facility
                   or, at Schein's option, may be handled through the One Box
                   return system. Costs of returns are to be included in the
                   computation of Net Sales as provided in Paragraph 1.04.
                   
              (3)  Handling all recalls of the Product. At Schein's request and
                   Miles' option, Miles will assist Schein in receiving the
                   recalled Product and any direct documented costs incurred by
                   Miles with respect to participating in such recall shall be
                   reimbursed by Schein;
                   
              (4)  Communicating with any governmental agencies and satisfying
                   their requirements regarding the authorization and/or
                   continued authorization to market the Product in commercial
                   quantities in the United States; provided, however, that
                   Miles shall be able to communicate with such agencies
                   regarding the Product if:
                   

                                      -9-

 
                   (i)   in the reasonable opinion of Miles' counsel, such
                         communication is necessary to comply with the terms of
                         this Agreement or the requirements of any law,
                         governmental order or regulation; and
                         
                   (ii)  Miles, if practical, made a request of such agency to
                         communicate with Schein instead, and such agency
                         refused such request; but in any such event, unless in
                         the reasonable opinion of Miles' counsel, there is a
                         legal prohibition against doing so, Schein shall be
                         immediately notified of such agency's request and of
                         Miles' intention to make such communication and Schein
                         shall be permitted to accompany Miles to any meeting
                         with such agency, take part in any such communications
                         and receive copies of all such communications provided
                         in no event shall Miles take any action which would
                         impose any liability or obligation on Schein, without
                         Schein's prior written consent; and
                        
              (5)  Handling product distribution, inventory and receivables;
                   except that the costs thereof shall be governed by Section
                   3.01 (a).
                   
         (b)  Each party shall respond to medical questions or inquiries
              relating to the Product directed to such party. Within a
              reasonable time from the date of this Agreement, but in no event
              later than the Effective Date, Schein shall provide Miles with all
              reasonably necessary information which would enable Miles to
              respond properly and promptly to any such questions or inquiries.
              Schein shall use its best efforts to keep such information
              current. Schein and Miles shall coordinate responses to
              anticipated inquiries and questions. Each party shall be
              responsible for ensuring that its responses are in full compliance
              with all applicable laws, rules, regulations and orders, including
              without limitation applicable FDA regulations, and are consistent
              with the Product approval and package insert.
              
4.10     Schein shall send to Miles, on a monthly basis, a copy of its monthly
         ex-factory sales report for the preceding month showing ex-factory
         sales of the Product.
         
         Additionally, Schein shall authorize Miles to access, on a monthly
         basis and at Miles' expense, its monthly DDD sales report on the
         Product.

                                     -10-

 
4.11     Notwithstanding the Marketing Plan or any other provision herein to the
         contrary, Schein will have the right and responsibility for
         establishing and modifying the terms and conditions with respect to the
         sale of the Product, including the price at which the Product will be
         sold, any discount attributable to payments on receivables,
         distribution of the Product and the like.
          
4.12     Subject to Article VII hereof, the joint promotion and detailing of the
         Product shall cease at the end of the Third Detailing Year; provided
         that the joint promotion and detailing of the Product and the term of
         this Agreement shall automatically be extended for successive one (1)
         year periods unless at least sixty (60) days before the expiration of
         the then-current term, either party gives written notice to the other
         that it does not wish to extend this Agreement. At the end of the Third
         Detailing Year (or, if later, at the end of any extension of the term
         of this Agreement or on termination under any circumstance) Miles shall
         have no further obligations to promote and detail the Product and, upon
         request by Schein, shall return to Schein all sales, marketing,
         training and other materials which it has in its possession relating to
         Product. Schein shall have the right to continue to distribute
         materials bearing the Miles name, until the inventories of such
         materials are depleted.
         
Article V: Warranties and Indemnification
- -----------------------------------------

5.01     Each party warrants and represents to the other that it has the full
         right and authority to enter into this Agreement, and that it is not
         aware of any impediment that would inhibit its ability to perform its
         obligations under this Agreement.

5.02     Schein warrants and represents that, to the best of its knowledge, the
         Product package insert adequately describes the toxicity and
         sensitivity reactions associated with the Product when administered in
         accordance with the package insert. Miles acknowledges that the Product
         is a "black box" product, with significant known side effects,
         including death.

5.03     Schein warrants and represents that it has no knowledge of the
         existence of any U.S. patent which would prevent Schein from making,
         using or selling the Product in the United States or would prevent
         Schein and Miles from jointly promoting or detailing the Product in the
         United States. Miles acknowledges that neither Schein nor any of its
         Affiliates holds any patent covering the Product.


                                     -11-

 
5.04     (a)  One party shall indemnify, protect and hold the other party
              harmless against any and all damages, costs, expenses, lawsuits
              and liabilities directly or indirectly resulting from claims,
              suits or judgments arising out of said one party's negligence (as
              between Schein or Miles) with resect to the Product or components
              thereof or the detailing, promoting or other obligations of said
              party hereunder. The other party shall promptly notify said one
              party of any claims or suits for which the other party may assert
              indemnification from said one party hereunder and the other party
              shall permit said one party, or its insurer, at said one party's
              expense, to assume or participate in the defense of any such
              claims or suits and the other party shall cooperate with said one
              party or its insurer in such defense when reasonably requested to
              do so.
              
         (b)  One party shall indemnify, protect and hold the other party
              harmless against any and all damages, costs, expenses, lawsuits,
              and liabilities directly or indirectly resulting from claims,
              suits or judgments with respect to the Product or components
              thereof or the detailing, promoting or other obligations of said
              one party hereunder to the extent that such damages, costs,
              expenses, lawsuits and liabilities are due to the contributory
              negligence of said one party. The other party shall promptly
              notify said one party of any such claims or suits for which the
              other party may assert contribution or indemnification from said
              one party and each party shall permit the other party or its
              insurer at the other party's expense, to participate in the
              defense of any and all such claims or suits and each party shall
              reasonably cooperate with the other party or its insurer in such
              defense when requested to do so.
              
         (c)  Without limitation, as between Miles and Schein, if an above-
              described claim, suit or judgment (or any portion thereof) is
              based solely on:
              
              (i)   the failure of the Product to meet any specifications in the
                    Schein New Drug Application approved by the U.S. Food and
                    Drug Administration ("FDA") or supplements thereto;
                   
              (ii)  misrepresentations or deficiencies in or omissions from the
                    Product's package insert approved by the FDA;

             then Miles shall not be deemed negligent with respect to such
             matters and shall be fully and completely indemnified by Schein
             under Section 5.04 (a) with respect to such claim, suit or judgment
             (or portion thereof) which solely involved such matters, and Schein
             
                                     -12-

 
             shall be permitted, at its sole cost, to assume full control over
             the defense of any such claim or suit (or portion thereof).
               
         (d) This Section 5.04 shall survive the termination of this Agreement.
          
Article VI: Reports
- -------------------

6.01     Schein shall keep such records as are required to determine accurately
         under United States generally accepted accounting principals the sums
         due to under this Agreement. Such records shall be retained by Schein
         and shall be made available for reasonable review and/or audit, at the
         request and expense of Miles by an independent Certified Public
         Accountant appointed by Miles and reasonably acceptable to Schein and
         subject to appropriate confidentiality undertakings for the purposes of
         verifying Schein' accounting reports hereunder and determining the
         correctness of such reports during the one hundred and twenty (120) day
         period following the close of the applicable Detailing Year, in respect
         of New Sales for the Detailing Year then ended.
          
6.02     All sums due to Miles shall be payable to Miles in U.S. dollars by
         Schein at the following address:

         Miles Inc.
         Pharmaceutical Division
         400 Morgan Lane
         West Haven, Connecticut 06516
         or at such other address within the United States that Miles may
         designate in writing to Schein.
         
6.03     Notwithstanding anything in this Agreement to the contrary, in the
         event that Schein' actual Net Sales of the Product in the United States
         are reduced, due to Adjustments after such Net Sales have been accrued
         pursuant to the terms of this Agreement, then Net Sales for the
         Detailing Year in which such Adjustments occur shall be reduced
         accordingly and Miles shall return to Schein within sixty (60) days of
         receipt of a notice from Schein requesting such return, any dollar
         amounts which were paid to Miles in respect of Net Sales during such
         Detailing Year which are in excess of the dollar amounts which would
         have been paid to Miles if Net Sales for such period reflected the Net
         Sales actually received by Schein, taking into account such
         Adjustments.
         
                                     -13-

 
Article VII: Term and Termination
- ---------------------------------

7.01     Unless sooner terminated as herein provided, or extended in
         accordance with Paragraph 4.12, this Agreement shall expire, subject
         to Paragraph 7.03 below. after the Third Detailing Year.

7.02     Either party may terminate this Agreement at any time for any reason
         whatsoever with one hundred and twenty (120) days written notice;
         provided no such termination shall be effective prior to April 1, 1996,
         unless the grounds for termination is Miles' or Schein's failure to
         fulfill its obligations under Section 2.02 or 2.03, respectively.

7.03     Termination of this Agreement shall be without prejudice to either
         party's right to obtain performance of any obligations provided for in
         this Agreement which survive termination by their terms.

Article VIII: Force Majeure
- ---------------------------

8.01     The performance by either party of any covenants or obligations on its
         part to be performed hereunder (other than an obligation of either to
         pay money to the other) shall be excused by floods, strikes or other
         labor disturbances, riots, fires, accidents, wars, embargoes, delays of
         carriers, inability to obtain materials from sources of supply, acts,
         injunctions, or restraints of governments (whether or not now
         threatened), or any cause preventing such performance whether similar
         or dissimilar to the foregoing beyond the reasonable control of the
         party bound by such covenant or its obligation, provided, however, that
         the party affected shall exert its reasonable diligent efforts to
         eliminate or cure or overcome any of such causes and to resume
         performance of its covenants with all possible speed.

Article IX: Dispute Resolution
- ------------------------------

9.01     Both parties are obligated to undertake all reasonable efforts in order
         to solve in an amicable way any controversy arising in connection with
         this Agreement. However, in the event that disputes arise that cannot
         be resolved at the immediate level, the dispute shall be referred to
         the President of Miles Pharmaceutical Division and the chairman of
         Schein.
    
Article X: Miscellaneous Provisions
- -----------------------------------

10.01    This Agreement shall be governed by and interpreted under the laws of
         the United States and of the State of New Jersey.
    

                                     -14-

 
10.02 (a) For a period of ten (10) years from the Effective Date of this
          Agreement or five (5) years from the termination hereof, whichever
          occurs later:
          
              (i)   each party agrees not to use Confidential Information
                    furnished by the other party for any purpose inconsistent
                    with this Agreement; and
                    
              (ii)  each party will treat Confidential Information furnished by
                    the other party as if it were its own proprietary
                    information and will not disclose it to any third party
                    other than its Affiliates or consultants without the prior
                    written consent of the other party who furnished such
                    information.
                   
              (iii) Miles shall not have the right for a period of five (5)
                    years from the termination of this Agreement to disclose,
                    publish and/or use for its benefit or for the benefit of any
                    third party any Confidential Information, sales, marketing,
                    training or other information provided to Miles by or on
                    behalf of Schein or its Affiliates received under this
                    Agreement to promote, achieve and/or maintain the sale and
                    use of the Product or any other pharmaceutical specialty
                    with indications similar to those of Product without the
                    prior written consent of Schein.
                   
10.03 A party shall be relieved of any and all of the obligations of Section
      11.02(a) with respect to Confidential Information if:
    
         (a)  such Confidential Information was known to the party receiving the
              Confidential Information prior to receipt from the disclosing
              party; or
              
         (b)  such Confidential Information was at the time of disclosure to the
              party receiving the Confidential Information generally available
              to the public or which became generally available to the public
              through no fault attributable to the party receiving the
              Confidential Information; or
              
         (c)  such Confidential Information was made available to the party
              receiving the Confidential Information for its use or disclosure
              from any third person who was at the time of transmitting such
              Confidential Information not under a non-disclosure obligation to
              the other party.
              
10.04 This Agreement shall be binding upon, and shall inure to the benefit of
      successors to a party hereto, but shall not otherwise be assignable
      without the prior written consent of both parties.
    

                                     -15-

 
10.05 Any notice required to be given hereunder shall be considered properly
      given if sent by certified mail, return receipt requested to the
      respective address of each party as follows:
     
                   Office of the President
                   Miles Inc.
                   Pharmaceutical Division
                   400 Morgan Lane
                   West Haven, Connecticut 06516
                   
         and
                   Chairman of the Board
                   Schein Pharmaceutical, Inc.
                   100 Campus Drive
                   Florham Park, NJ 07932
                   
         or to such other address as the addressee shall have last furnished in
         writing in accord with this provision to the addresser.
         
10.07 If any provision of this Agreement is held to be invalid, such invalidity
      shall not affect the validity of the remaining provisions.
    
10.08 All captions herein are for convenience only and shall not be interpreted
      as having any substantive meaning.
    
10.09 All covenants, agreements, representations and warranties made hereunder
      shall be deemed to have been relied upon notwithstanding any investigation
      heretofore or hereafter made and shall survive the execution of this
      Agreement.
    
10.10 This Agreement constitutes the entire agreement between the parties hereto
      with respect to the within subject matter and supersedes all previous
      agreements, whether written or oral. It may be changed only in writing
      signed by properly authorized representatives of Miles and Schein.
    
10.11 Neither party shall be entitled to assign its rights hereunder without the
      express written consent of the other party hereto.
    

                                     -16-

 
IN WITNESS WHEREOF, Miles and Schein have caused this Agreement to be duly
executed by their authorized representatives, in duplicate on the dates written
hereinbelow.

Attest:                         Miles Inc.


By /s/                          By /s/ Horst K. D. Wallrabe
  ___________________________     ___________________________

                                Horst K. D. Wallrabe,
                                Executive Vice President
                                Miles Inc. and
                                President
                                Pharmaceutical Division
                           

                                Date     November 11, 1994
                                    --------------------------

Attest:                         Schein Pharmaceutical, Inc.


By /s/ P. K. McCullough         By /s/ Martin Sperber      
  ___________________________     ___________________________
                        
                                Martin Sperber
                                Chairman of the Board and
                                Chief Executive Officer

                                Date     Dec 9, 1994
                                    --------------------------


                                     -17-

 
                                  APPENDIX I
                         COMPLAINT HANDLING PROCEDURES
  
The purpose of this appendix is to establish written procedures for the
communication and processing of Product complaints received by Miles.

Acting in accord with this Agreement will facilitate compliance with Federal
Requirements as set forth in 21 CFR 211.198 (complaint files) and 21 CFR
310.305/21 CFR 314.80 (postmarketing reporting of adverse drug reactions).

A.   Complaint Reporting:

     1.   Complaints reported directly to Miles will be summarized and forwarded
          to the Supervisor of Clinical Affairs at Schein.
         
     2.   All adverse drug experience complaints reported to Miles will be
          communicated to Schein within three working days of report receipt.
          Schein will be responsible for completion and submission to the Food
          and Drug Administration of Form FDA-3500A where appropriate.
         
     3.   Complaint reports which may meet NDA-Field Alert Report Criteria [21
          CFR 314.81 (b) (1)] will be promptly communicated to Schein enabling
          FDA notification by Schein within three working days. Schein will
          advise Miles of NDA Field Alert Report submission and forward a copy
          of any such report to the Complaint Coordinator (see A.1 above) of
          Miles.
         
B.   Complaint Investigation:

     1.   Schein will investigate all complaints, including complaints
          associated with Product's active or inactive ingredients,
          container/closure system, general Product quality, distribution or
          handling.
          
C.   Communications with Complainant:

     1.   Schein will be responsible for review of complaint evaluation
          information and preparation of a written response.
         
     2.   In situations requiring submission of adverse drug experience reports,
          Schein will be responsible for any follow-up communications which may
          be required in order to facilitate timely completion and submission of
          FDA Form-3500A's.
         
D.   Product Recall:

     1.   In carrying out a recall, both parties will fully cooperate in
          notifying customers to follow instructions as agreed upon by the
          parties.
          

 
                 AMENDMENT NUMBER 1 TO CO-PROMOTION AGREEMENT
                 --------------------------------------------

    
     This Amendment to Co-Promotion Agreement (the "Amendment") is entered into
as of the 1st day of January 1997 between Miles, Inc., an Indiana corporation,
now known as Bayer Corporation ("Bayer"), and Schein Pharmaceutical, Inc., a
Delaware corporation ("Schein").

                                 Introduction
                                 ------------ 

     A.   Bayer and Schein entered into a Co-Promotion Agreement, dated August
1, 1994 (the "Agreement").

     B.   Pursuant to the terms of the Agreement, Bayer and Schein agreed to
jointly promote and detail the Product (as defined in the Agreement) in the
United States.

     C.   The parties wish to amend the Agreement in accordance with the terms
of this Amendment.

     NOW, THEREFORE, in consideration of the mutual covenants and promises
herein contained, and for other good and valuable consideration, it is agreed as
follows:

     1.   Definitions In This Amendment and Incorporation. Unless otherwise
          -----------------------------------------------
defined, all terms used herein shall have the meaning ascribed to them in the
Agreement, and the terms and provisions of the Agreement are incorporated herein
by reference as though set forth in full.

     2.   Definitions.  The following is added to the end of Section 1.06 of the
          -----------
Agreement: "Effective as of December 29, 1996, a 'Detailing Year' shall be the
twelve (12) month period commencing on the last Sunday in December of the Term".

     3.   Grants and Obligations.
          ----------------------

          The second paragraph of Article II, Section 2.01 of the Agreement is
hereby deleted in its entirety and replaced by the following:

               "During the Joint Detailing Years, Schein shall not authorize, or
               grant the right to, any third party to detail the Product in
               the United States in the field of Nephrology: provided, however,
               that Schein may authorize, or grant the right to, any third party
               to detail and promote the Product in the United States in a field
               other than Nephrology.

 
     4.   Payments.
          -------- 

          Article III, Subsections 3.01 (a), (b), (c) and (d) of the Agreement
are hereby deleted in their entirety and replaced by the following:

               "3.01 (a) Effective January 1, 1997, Schein shall pay to Bayer in
               each Detailing Year the following: (i) the aggregate amount of
               $3,000,000 payable in four equal installments of $750,000 each,
               within sixty (60) days after the close of each fiscal quarter
               during a Detailing Year, plus (ii) an amount equal to *** *****
               ** *** ***** ****** *** ********* ********* *** **** **** ****** 
               *** ******* ****** in each Detailing Year, payable annually
               within sixty (60) days after the end of such Detailing Year. The
               annual payment relating to *** ***** shall be accompanied by an
               accounting of such *** ***** indicating aggregate quantities and
               dollar amounts of the Product. For purposes of this Agreement,
               ***** **** ******* ***** **** *** ********** *** *********** for
               the Detailing Year commencing December 29, 1996, and (ii) for
               each Detailing Year thereafter, Schein and Bayer shall meet
               within sixty (60) days prior to the start of such Detailing Year
               for the purposes of ********* *** **** **** ****** *** ****
               ****** ********* **** *** *********** ** **** ***** *** 
               *********** ********** ** *** **** **** ****** *** *******
               ********** *** *** ******* *** *** ****** ** * ***********
               ******* ** *** ******* *** ********** *********** ** ********
               ******* *** *** ******** ******* ** ** ** **** ** **** ********
               *** ****** ***** ***** *** *** ********** ************** ********
               ** ****** ******* *********** **** ******** **** ****** ********
               ** *** ******* ** *** ********** **** ******* ** *** ** **** ***
               ***** ********* ** ********

     5.   Reaffirmation of Agreement and Other Document. Except as modified
          ---------------------------------------------
herein, all of the covenants, terms and conditions of the Agreement remain in
full force and effect and are hereby ratified and reaffirmed in all respects. In
the event of any conflict, inconsistency or incongruity between the terms and
conditions of this Amendment and the covenants, terms and conditions of the
Agreement the terms and conditions of this Amendment shall govern and control.

     6.   Counteparts. This Amendment may be executed in two or more
          -----------
counterparts each of which together shall constitute an original but which,
when taken together, shall

* redacted pursuant to confidential treatment request.

                                       2

 
constitute but one instrument and shall become effective when copies hereof,
when taken together, bear the signatures of all required parties and persons.

     IN WITNESS WHEREOF, this Amendment is executed as of the day and year first
above written.

                              BAYER CORPORATION


                              By: /s/ Gerald B. Rosenberg
                                  ----------------------------
                              Name: Gerald B. Rosenberg
                                    --------------------------
                              Title: Senior Vice President and General Manager 
                                     -----------------------------------------

                              SCHEIN PHARMACEUTICAL, INC. 
                          
                              
                              By: /s/ Michael D. Casey 
                                  -------------------------
                              Name: Michael D. Casey   
                                    -----------------------
                              Title: President Retail Specialty Product Division
                                     -------------------------------------------

                                       3

 
                   AMENDMENT NO. 2 TO CO-PROMOTION AGREEMENT
                   -----------------------------------------

     This Amendment Number 2 to Co-Promotion Agreement (the "Amendment") is
entered into as of the 1st day of January 1997 between Bayer Corporation,
formerly known as Miles, Inc. ("Bayer") and Schein Pharmaceutical, Inc.
("Schein").

                                 Introduction
                                 ------------ 

A.   Bayer and Schein entered into a Co-Promotion Agreement, dated August 1,
1994 which was amended by Amendment Number 1 to Co-Promotion Agreement dated
January 1, 1997 (collectively, the "Agreement").

B.   Pursuant to the terms of the Agreement, Bayer and Schein agreed to jointly
promote and detail the Product (as defined in the Agreement) in the United
States.

C.   Bayer Puerto Rico Inc. ("Bayer Puerto Rico") and Schein entered into a
Promotion Agreement, dated February 1, 1995 (the "Puerto Rico Agreement").

D.   Pursuant to the terms of the Puerto Rico Agreement, Bayer Puerto Rico and
Schein agreed to jointly promote and detail the Product (as defined in the
Agreement) in Puerto Rico.

E.   Bayer and Schein wish to amend the Agreement to include Bayer Puerto Rico's
obligations with respect to promotion of the Product in Puerto Rico in the
Agreement. Bayer Puerto Rico and Schein simultaneously herewith have terminated
the Puerto Rico Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants and promises
herein contained, and for other good and valuable consideration, it is agreed as
follows:

     1.   Definitions In This Amendment Number 2 and Incorporation.  Unless
          --------------------------------------------------------
otherwise defined, all terms used herein shall have the meaning ascribed to them
in the Agreement, and the terms and provisions of the Agreement are incorporated
by reference as though set forth in full.

     2.   Definitions.
          -----------
(a)  Section 1.03 is deleted in its entirety and replaced with the following:

          " `Territory' shall mean the United States and Puerto Rico."

(b)  Except for Section 10.01 of the Agreement, in all places where the defined
term "United States" appears it is hereby replaced with the defined term
"Territory."

     3.   Addition of Bayer Puerto Rico as Party to the Agreement. With respect
          -------------------------------------------------------
to its promotion of the Product in Puerto Rico, Bayer Puerto Rico agrees to the
terms and conditions in the Agreement.


 
     4.   Reaffirmation of Agreement and Other Documents. Except as modified
          ----------------------------------------------
herein, all of the covenants, terms and conditions of the Agreement remain in
full force and effect and are hereby ratified and reaffirmed in all respects. In
the event of any conflict, inconsistency or incongruity between the terms and
conditions of this Amendment and the covenants, terms and conditions of the
Agreement the terms and conditions of this Amendment shall govern and control.

     5.   Counterparts. This Amendment may be executed in two or more
          ------------
counterparts, each of which together shall constitute an original but which,
when taken together, shall constitute but one instrument and shall become
effective when copies hereof, when taken together, bear the signatures of all
required parties and persons.

     IN WITNESS WHEREOF, this Amendment is executed as of the day and year first
above written.

     BAYER CORPORATION        BAYER PUERTO RICO INC.

     By:________________      By:________________
     Name:______________      Name:______________
     Title:_____________      Title:_____________

     SCHEIN PHARMACEUTICAL, INC.

     By:________________
     Name:______________
     Title:_____________


 
                   AMENDMENT NO. 3 TO CO-PROMOTION AGREEMENT
                   -----------------------------------------

This Amendment Number 3 to Co-Promotion Agreement (the "Amendment") is entered 
into as of the 28th day of January 1998 between Bayer Corporation, formerly 
known as Miles, Inc. ("Bayer") and Schein Pharmaceutical, Inc. ("Schein").

                                 Introduction
                                 ------------

A.      Bayer and Schein entered into a Co-Promotion Agreement, dated August 1, 
1994 which was amended by Amendment Number 1 to Co-Promotion Agreement dated 
January 1, 1997 and Amendment Number 2 to Co-Promotion Agreement dated January 
1, 1997 (collectively, the "Agreement").

B.      Pursuant to the terms of the Agreement, Bayer and Schein agreed to 
jointly promote and detail the Product (as defined in the Agreement) in the 
United States and Puerto Rico.

C.      The parties wish to amend the Agreement in accordance with the terms of 
this Amendment.

        NOW, THEREFORE, in consideration of the mutual covenants and promises 
herein contained, and for other good and valuable consideration, it is agreed as
follows:

        1.      Definitions In This Amendment and Incorporation. Unless
                -----------------------------------------------
otherwise defined, all terms used herein shall have the meaning ascribed to them
in the Agreement, and the terms and provisions of the Agreement are incorporated
herein by reference as though set forth in full.

        2.      Grants and Obligations.
                ----------------------

                Article II, Section 2.02 is hereby amended to add the following:

                        "(c) Without limiting the generality of the foregoing,
                        Bayer will assign ** ********** sales representatives
                        and ** ************* ********* sales specialists to
                        promote and detail the Product. Additionally, Bayer will
                        use best efforts to insure a sufficient amount of
                        selling time will be allotted to promoting and
                        detailing the Product. ** ** ********** *** ****** ****
                        ******* ******** ***** ************** **** ** ******
                        ******* *** ****** *** *******."

        3.      1998 Base Line Figure.
                ---------------------

                In accordance with Article III, Section 3.01 (a) (u), the Base 
Line Figure for the 1998 Detailing Year shall be ***,***,***.

* redacted pursuant to confidential treatment request.

 
        4.      Cooperation Rights and Responsibilities
                ---------------------------------------

                Article IV is hereby amended to add a new Section as follows:

                        "4.13 Each of Schein and Bayer agrees that during the
                        term of this Agreement and for a period of one year
                        after the termination of this Agreement for whatever
                        reason, neither it nor any of its Affiliates shall,
                        except with the prior written consent of the other
                        party, offer employment to or employ any person in the
                        other party's sales force if such person was involved in
                        promoting the Product under this Agreement.

        5.      Reaffirmation of Agreement and Other Documents.  Except as 
                ----------------------------------------------
modified herein, all covenants, terms and conditions of the Agreement remain in 
full force and effect and are hereby ratified and reaffirmed in all respects. 
In the event of any conflict, inconsistency or incongruity between the terms and
conditions of this Amendment and the covenants, terms and conditions of the 
Agreement, the terms and conditions of this Amendment shall govern and control.

        6.      Counterparts. This Amendment may be executed in two or more 
                ------------
counterparts, each of which together shall constitute an original but which, 
when taken together, shall constitute but one instrument and shall become 
effective when copies hereof, when taken together, bear the signatures of all 
required parties and persons.


        IN WITNESS WHEREOF, this Amendment is executed as of the day and year 
first above written.


BAYER CORPORATION

By: /s/ Gerald [illegible]
   ---------------------------------

Name:   Gerald [illegible]
     -------------------------------

Title: SR VP/[illegible]
      ------------------------------



SCHEIN PHARMACEUTICAL, INC.

By: /s/ Adam A. Levitt
   ---------------------------------

Name:   Adam A. Levitt
     -------------------------------

Title: V.P. Brand Products Group
      ------------------------------