Exhibit 10.3


                            MERCK SERVICES AGREEMENT



         THIS SERVICES AGREEMENT (the "Agreement") is dated as of June 30, 1998,
between  Pharmaceutical  Resources,  Inc.,  a  New  Jersey  corporation,   whose
principal  offices are located at One Ram Ridge Road,  Spring  Valley,  New York
10977  (the  "Company"),  and Merck  KGaA,  a  Kommanditgesellschaft  auf Aktien
organized  under the laws of  Germany,  whose  principal  offices are located at
Frankfurter Strasse 250, 64271 Darmstadt, Germany (the "Service Provider"), each
of which may be referred to  individually  as a "Party" or  collectively  as the
"Parties."  This Agreement and the Annex  contemplated  hereby are  collectively
referred to as the "Agreement" unless indicated otherwise.

         WHEREAS,  the Service Provider possesses,  inter alia,  substantial and
long  acquired  technical  expertise  and  know-how  in  the  areas  of  product
development, clinical studies and trials, marketing, distribution, financial and
administrative  support,  and other areas related to the  development of ethical
and generic drugs; and

         WHEREAS,  the Company wishes to engage certain  services of the Service
Provider,  and the Service  Provider is willing to perform the Services  defined
herein,  on the terms and conditions set forth herein,  in  consideration of the
issuance  by the Company to the  Service  Provider of a stock  option to acquire
820,000 shares of common stock of the Company (the "Option Shares"), in the form
of the Annex hereto (the "Option").

         NOW, THEREFORE, in consideration of the mutual obligations and benefits
set forth in this  Agreement,  the receipt and  sufficiency  of which are hereby
acknowledged,  the Company and the Service Provider agree to the following terms
and conditions:

1.       Services
         --------

1.1      At the request of the Company  and  subject to the  provisions  of this
         Agreement,  the  Service  Provider  will  perform  some  or  all of the
         following services (the "Services") with respect to certain products as
         agreed to between the parties from time to time (the "Products"):

a.       providing  assistance  to conduct,  monitor  and  analyze  preclinical
         investigations.

b.       rendering advice to the Company's  research and development  department
         on the design and development of protocols.

                                      -1-


c.       providing   assistance  and  advice  to  develop  and  prepare  Product
         formulations  and dosage  forms for  preclinical,  clinical  trials and
         commercial  purposes  and  develop  methods  for  establishing  Product
         stability (including expiration dating).

d.       providing   assistance   to  develop   and   transfer  to  the  Company
         manufacturing  methods and procedures  for the synthesis,  scale-up and
         process  validation  for the  manufacture  of Products and their active
         ingredients for clinical and commercial purposes.

e.       assisting  in  developing  methods  and  procedures  for  the  testing,
         analysis and quality  control of finished  dosage forms of Products and
         their ingredients.

f.       assisting the Company in the preparation of ANDAs.

g.       providing periodic status reports on the Services being performed.

h.       providing assistance,  if required, to prepare and file Federal,  State
         and local tax returns.

i.       advising on the investment of funds and rendering assistance and advice
         with respect to real property owned or leased by the Company.

j.       providing  various legal  support  services  when  required,  including
         advice  with  respect to product  liability  claims and  actions  filed
         against the Company.

k.       providing  technical support and/or consulting services for the Company
         to optimize the Company's  production  capacity.  To effectuate such an
         optimization,  the  Service  Provider  may from time to time,  transfer
         industry demand,  capacity utilization data to the Company to assist in
         the production planning process.

l.       providing   assistance   in  financial   planning,   budgeting,   sales
         forecasting  for  the  Products,  subject  to  the  Service  Provider's
         internal operational constraints.

m.       providing  additional  administrative  and  technical  support  for new
         product launches.

n.       providing computer and/or management information system support for the
         Company.

o.       providing  quality control and quality assurance  services,  as needed,
         including Product testing.

p.       advising in business planning and analysis.

q.       providing assistance in certain data processing functions in support of
         other management services provided pursuant hereto.
   
                                   -2-


1.2      The Service Provider shall use its reasonable efforts to ensure that
         the Services  provided  hereunder are consistent with accepted industry
         standards and in a professionally competent manner.

1.3      The  Service  Provider  shall use its  reasonable  efforts to render
         Services in material compliance with all applicable legal requirements.

1.4      In order for the Service Provider to provide the Services hereunder,
         the Company shall disclose to the Service Provider such information and
         data which is reasonably requested by the Service Provider. The Service
         Provider  shall  use  such  information  and  data  exclusively  in the
         performance of its obligations hereunder,  and such disclosure shall be
         subject  to the  terms  and  conditions  of this  Agreement,  including
         Section 7, if such disclosure is of Confidential Information as defined
         herein.

2.       Payment Terms
         -------------

         In consideration of the Services to be rendered by the Service Provider
hereunder and of its undertaking to perform such Services for the benefit of the
Company during the term of this  Agreement,  the Company shall make full payment
of its  obligations  hereunder  in the form of the  Option.  Such  Option  shall
entitle the Service  Provider  to  acquire,  beginning  three years and ten days
after the date  hereof,  820,000  shares of the  Company's  common  stock at the
Exercise  Price (as  specified  in the Option) for the Services  provided.  Such
Option  shall  expire at 5:00 P.M.,  New York City time,  on June 30, 2003 if it
shall not have been  fully  exercised.  The  Company  shall also  reimburse  the
Service  Provider for all  reasonable  out-of-pocket  costs and expenses  (which
shall not include any direct or indirect  labor  costs)  incurred in  connection
with the performance of such Services,  including,  without  limitation,  travel
expenses,  meals and lodging,  cost for supplies  directly consumed in rendering
such Services,  storage and warehousing  costs,  printing and duplicating costs,
and transport and similar costs;  provided,  any such reimbursement in excess of
$10,000 in any calendar  quarter,  shall  require the  Company's  prior  written
approval.  The Company shall be under no  obligation to make any other  payments
for the Services contemplated herein pursuant to this Agreement.

3.       Schedule of Performance
         -----------------------

         During the term of this Agreement,  the Service  Provider shall perform
the Services  from time to time,  as  reasonably  required by the Company and as
agreed upon  between the Company and the Service  Provider,  upon the  Company's
advance written notice which shall be received by the Service  Provider not less
than ten business days before the proposed  service  date.  Upon receipt of such
notice,  the Service  Provider  shall have five  business  days to accept or, in
consultation  with the Company,  reschedule the service date. The Company hereby
acknowledges  that the Service  Provider  must take into  consideration  its own
labor constraints and existing  commitments of its own business to other parties
in  determining  the service date of such Services.  In any event,  the Services
requested  by the  Company  shall  not be more than a total of 200 man hours per
calendar quarter unless the Service Provider expressly agrees otherwise. 

                                      -3-


4.       Term
         ----

         This  Agreement  shall be effective  from the date of execution of this
Agreement and shall remain in effect for thirty-six (36) months.

5.       Representations and Warranties
         ------------------------------

5.1      Each  Party  hereby  represents  and  warrants  to the  other  Party as
         follows:

         (a)  It is a corporation  duly organized,  validly existing and in good
              standing under the laws of its jurisdiction of incorporation;

         (b)  It has the corporate power and authority to own its assets,  carry
              on its  business  and execute and deliver  this  Agreement  and to
              perform its obligations hereunder;

         (c)  It has taken all appropriate and necessary action to authorize the
              execution, delivery and performance of this Agreement;

         (d)  All consents,  approvals,  licenses and authorizations of, and all
              filings  and  registrations   with,  any  governmental   authority
              necessary  for  the  due  execution,   delivery,  performance  and
              enforceability  of this  Agreement,  have been obtained and are in
              full force and effect; and

         (e)  This Agreement  constitutes a legal, valid and binding obligation,
              enforceable in accordance with its terms. The execution,  delivery
              and  performance  of this Agreement will not violate any provision
              of any applicable laws or regulations.

6.       Independent Contractor
         ----------------------

         This  Agreement  does not  constitute or create (and the Parties do not
         intend  to  create  hereby)  a  joint  venture,   pooling  arrangement,
         partnership,  or formal  business  organization of any kind between and
         among any of the Parties, and the rights and obligations of the Parties
         shall be only those  expressly set forth herein.  The Service  Provider
         will perform the Services as an independent contractor and shall not be
         considered,  for any  purpose,  to be an  agent of the  Company  or its
         affiliated companies. Each Party shall be responsible for providing its
         own personnel and workers'  compensation,  medical  coverage or similar
         benefits,  any life,  disability or other  insurance  protection.  Each
         Party shall be solely  responsible  for the payment of social  security
         benefits,  unemployment  insurance,  pension benefits,  withholding any
         required  amounts  for  income and other  employment-related  taxes and
         benefits of its own employees,  and shall make its own arrangements for
         injury,  illness or other  insurance  coverage to protect  itself,  its
         affiliated companies,  its subcontractors and personnel from any costs,
                                      -4-


         expenses,  damages, loss and/or liability arising out of performance of
         the Services, or any transportation  associated therewith.  The Service
         Provider has no power or authority to act for,  represent,  or bind the
         Company or its affiliated companies in any manner.

7.       Confidentiality

7.1      (a)  The Parties  recognize  that in the course of  performance  of the
              Agreement,  either of them may  disclose to the other  information
              about the  disclosing  Party's  business or activities  which such
              Party considers  proprietary and confidential  including,  without
              limitation,  trade secrets, marketing and business plans, customer
              lists,  and  information  concerning the operations of the Parties
              (all  of  such   proprietary  and   confidential   information  is
              hereinafter  referred to as the "Confidential  Information").  The
              Party who receives any  Confidential  Information  (the "Receiving
              Party")  agrees  to  maintain  a  confidential   status  for  such
              Confidential  Information,   not  to  use  any  such  Confidential
              Information  for any  purpose  other than the purpose for which it
              was  originally  disclosed  to the  Receiving  Party,  and  not to
              disclose any of such Confidential  Information to any third party,
              unless such information:

              (i)    is or has  become  available  to the  public  from a source
                     other than the Receiving Party;

              (ii)   was already known to the Receiving Party from sources other
                     than the other  Party at the time it was  disclosed  to the
                     Receiving Party and was not obtained by the Receiving Party
                     from such other party in violation of a confidentiality  or
                     similar agreement with such other party;

              (iii)  is disclosed to the Receiving Party by a third party who is
                     not under any legal obligation prohibiting such disclosure;

              (iv)   is required to be disclosed by law;

              (v)    is developed independently by the Receiving Party; or

              (vi)   is  disclosed  to the  Receiving  Party  by a  third  party
                     pursuant  to an  obligation  of  such  third  party  or the
                     exercise of a right by the Receiving Party in circumstances
                     where  no  obligation  of  confidentiality  applies  to the
                     Receiving   Party  with  respect  to  the   information  so
                     disclosed.

         (b)  The  Parties  acknowledge  that they may be  required  to disclose
              Confidential  Information to governmental  agencies or authorities
              by law or in  connection  with the  obtaining of approvals for the

                                      -5-


              Company,  and each  shall  endeavor  to limit  disclosure  to that
              purpose.  If either  Party is required  to  disclose  Confidential
              Information   pursuant   to  this   paragraph,   such  Party  will
              immediately  give  the  other  Party  written  notice  of any such
              disclosure,  which  notice  shall  specify  the  substance  of the
              disclosure.  The Party  making  such a  disclosure  shall take all
              reasonable   steps  to   prevent   further   disclosure   of  such
              Confidential Information.

7.2      Survival of  Confidentiality:  The  provisions  of this Section 7 shall
         survive the  termination of this  Agreement for any reason  whatsoever.
         Upon such  termination,  the  Parties  shall  return  any  Confidential
         Information which may have been transmitted by the other Party, as well
         as any  copy or  other  reproduction,  including,  without  limitation,
         electronic data reproductions or representations.

8.       Dispute Resolution
         ------------------

8.1      In the event of any  controversy  or claim between the Parties  arising
         out of or in connection  with this Agreement or the breach hereof,  the
         Parties  shall,  in the first  instance,  make a good  faith  effort to
         settle such dispute amicably.

8.2      If such  controversy or claim is not settled within thirty (30) days
         following  written  notice  by one  Party  to the  other  Party  of the
         existence  thereof,  such  controversy  or claim  shall be  settled  by
         arbitration  in  New  York,  NY,  in  accordance  with  the  Commercial
         Arbitration Rules of the American Arbitration  Association and judgment
         upon the award may be entered in any court having jurisdiction thereof.

9.       Notices
         -------

         All notices and other  communications  required or permitted  hereunder
         shall  be  given in  writing  by hand  delivery,  by  facsimile,  or by
         registered  or  certified  mail,  return  receipt  requested,   postage
         prepaid,  addressed to the Party to receive the same at its  respective
         address set forth below,  or at such other  address as may from time to
         time be  designated  by either  Party to the other Party  hereunder  in
         accordance with this Section 9:

         To the Service Provider:

                  Merck KGaA
                  Frankfurter Strasse 250
                  64271 Darmstadt, Germany
                  Attn: Professor Dr. Bernhard Scheuble
                  Facsimile:  011 49-6151-72-5962

                                      -6-


         With a copy to:

                  Coudert Brothers
                  1114 Avenue of the America
                  New York, New York 10036-7703
                  Attn: Edwin S. Matthews Jr., Esq.
                  Facsimile: 212-626-4120

         To the Company:

                  Pharmaceutical Resources, Inc.
                  One Ram Ridge Road
                  Spring Valley, New York 10977
                  Attn:  Kenneth I. Sawyer
                  Facsimile:  914-425-5097

         With a copy to:

                  Hertzog, Calamari & Gleason
                  100 Park Avenue
                  New York, New York 10017
                  Attn: Stephen Ollendorff, Esq. & Stephen R. Connoni, Esq.
                  Facsimile: 212-213-1199

         All notices shall be effective  when  received.  A notice is considered
         received if a written  confirmation of receipt appears thereon or there
         exists a written fax  confirmation.  Either  Party may by notice to the
         other Party designate a new address for notices, such new address to be
         effective ten (10) days after receipt of designation.

10.      Indemnity
         ---------

10.1     Each Party hereby  agrees to indemnify  and hold  harmless the other
         Party  and  its  respective  shareholders,   directors,   officers  and
         employees from and against any and all costs, losses, claims,  actions,
         demands,   damages  and  liabilities  (including  attorneys'  fees  and
         disbursements)  incurred  by  such  other  party  arising  out of or in
         respect  of (i) any  act,  failure  to act,  or any  assumption  of any
         obligation or  responsibility  by the indemnifying  Party, or by any of
         its  directors,  officers or employees,  which is in  contravention  or
         violation of or in conflict with any of the terms or provisions of this
         Agreement, or (ii) any material breach of any of the representations or
         warranties  made  by  the  indemnifying  Party  under  this  Agreement;
         provided,  however,  that an indemnified Party shall not be entitled to
         indemnification  with respect to any costs,  losses,  claims,  actions,
         demands,  damages  and  liabilities  which was  caused by its own gross
         negligence,  willful  misconduct  or reckless  disregard  of its duties
         hereunder.

10.2     THE SERVICE  PROVIDER  MAKES NO  WARRANTIES,  EXPRESS OR IMPLIED,  WITH
         RESPECT TO THE AGREEMENT OR THE  PERFORMANCE  OF THE SERVICES  PROVIDED
   
                                   -7-


         HEREUNDER OR THE WORK FURNISHED HEREUNDER, WHETHER ARISING AT LAW OR IN
         EQUITY, EXCEPT AS SET FORTH HEREIN.

10.3     IN NO EVENT,  OTHER THAN  BREACH OF THE EXPRESS  PROVISIONS  OF THIS
         AGREEMENT,  SHALL EITHER PARTY OR A PARTY'S AFFILIATES AND ITS OR THEIR
         SUBCONTRACTORS  AND ITS OR THEIR  OFFICERS,  EMPLOYEES  AND AGENTS,  BE
         LIABLE,  IN CONTRACT,  IN TORT,  OR  OTHERWISE  FOR ANY  INCIDENTAL  OR
         CONSEQUENTIAL  DAMAGES  OF ANY  NATURE  ARISING  AT ANY TIME UNDER THIS
         AGREEMENT,  INCLUDING  SPECIFICALLY,  BUT WITHOUT  LIMITATION,  LOSS OF
         PROFITS  OR  REVENUE,  LOSS OF FULL OR  PARTIAL  USE OF ANY  EQUIPMENT,
         DELAYS, COST OF REPLACEMENTS, COST OF CAPITAL, LOSS OF GOODWILL, CLAIMS
         OF CUSTOMERS, OR OTHER SUCH DAMAGES.

11.      Miscellaneous
         -------------

11.1     Entire  Agreement.  This Agreement,  together with the Annex hereto,
         constitute  the entire  agreement of the Parties hereto with respect to
         the performance of Services by the Service Provider for the Company and
         supersedes and terminates all prior  arrangements  and  agreements,  if
         any,  between  the  Service  Provider  and  the  Company  or any of its
         affiliates with respect to the subject matter hereof.

11.2     No Waiver.  No failure by either Party  hereto to  exercise,  and no
         delay in  exercising,  any right  hereunder  shall  operate as a waiver
         thereof,  nor  shall  any  single  or  partial  exercise  of any  right
         hereunder by either Party preclude any other or future exercise of that
         right or any other right hereunder by that Party.

11.3     Severability.  In case  any one or more of the  provisions  of this
         Agreement  should be invalid,  illegal or unenforceable in any respect,
         the validity,  legality and enforceability of the remaining  provisions
         contained herein shall not in any way be affected or impaired thereby.

11.4     Assignment.  Neither Party may assign or transfer, in whole or in part,
         its rights or interests in this Agreement.

11.5     Amendment.  This  Agreement  may  not  be  amended,  terminated  or
         superseded  except by (i) an agreement  in writing  between the Company
         and the  Service  Provider  and (ii) the prior  written  approval  of a
         majority of the Company Designees (as such term is defined in the Stock
         Purchase Agreement, dated March 25, 1998, between the Company and Lipha
         Americas, Inc.).

                                      -8-


11.6     Survival:  Any provision of this  Agreement  which can reasonably be
         construed as surviving the  expiration or termination of the Agreement,
         including  but  not  necessarily  limited  to the  indemnification  and
         confidentiality provisions, shall so survive.

11.7     Governing  Law:  This  Agreement,  including  the  Annex,  shall be
         governed by, and construed in accordance with, the laws of the State of
         New York  without  giving  effect  to the  conflict  of law  provisions
         thereof.

11.8     Agreement  to Execute  Documents:  The  Parties  agree in good faith to
         execute any and all  documents  required  for the  performance  of this
         Agreement.

11.9     Counterparts:  This  Agreement  may be  executed  in any  number of
         separate counterparts, each of which, when so executed, shall be deemed
         an  original,  and all of said  counterparts  taken  together  shall be
         deemed to constitute but one and the same instrument.

         IN WITNESS  WHEREOF,  this  Agreement has been executed by the Parties,
effective as of the date above indicated.

PHARMACEUTICAL RESOURCES INC.           MERCK, KGaA



/s/Kenneth I. Sawyer                    /s/Bernhard Scheuble
- -------------------------------         ------------------------------------
By: Kenneth I. Sawyer                   By: Prof. Dr. Bernhard Scheuble
Name:                                   Name:
Title: Chairman & CEO                   Title: Member of the Executive Board



                                        /s/Klaus-Peter Brandis
                                        ------------------------------------
                                        By: Klaus-Peter Brandis
                                        Name:
                                        Title: Head of Legal Department



                                      -9-




                                      Annex



See Exhibit 10.4