Exhibit 10.1



Contact:
Kenneth I. Sawyer
President
Pharmaceutical Resources, Inc.
(914) 573-0390


FOR IMMEDIATE RELEASE


                         PHARMACEUTICAL RESOURCES, INC.,
                        ANNOUNCES STRATEGIC ALLIANCE WITH
                                   MERCK KGaA

     Spring Valley, New York, March 26, 1998 -- Pharmaceutical  Resources,  Inc.
(NYSE/PSE:PRX)  announced  today that it has formed a  strategic  alliance  with
Merck KGaA, Darmstadt, Germany, a German pharmaceutical, laboratory and chemical
company. Under the agreement, Merck KGaA, through its subsidiary Lipha Americas,
Inc.  ("Lipha"),  will pay Resources cash for 10,400,000  newly-issued shares as
well as give  Resources  the sole  rights to market an  important  portfolio  of
products  for the U.S.  through  Merck's  Canadian  subsidiary,  Genpharm,  Inc.
("Genpharm").  The cash  purchase  price of $2 per share will provide  Resources
$20.8 million for  investment in its  continuing  business,  and will give Merck
KGaA a 36% stake in Resources.  The Company intends to use a significant portion
of the net  proceeds  of the stock sale to repay  advances  made to it under its
existing  line of credit and the  remainder  will be used for  working  capital,
including business expansion.

          In  addition,  Merck KGaA agreed to purchase  1,813,272  shares of the
Company's common stock from Clal  Pharmaceutical  Industries Ltd. ("Clal"),  the
Company's largest stockholder, and Merck KGaA and the Company acquired rights to
purchase an additional  500,000  shares from Clal in three years.  In connection
with the  transactions,  Merck KGaA and Genpharm also agreed to provide  certain
consulting services to the Company in exchange for 5-year options to purchase an
aggregate of 1,171,040 additional shares of the Company's common stock at $2 per
share.

          The  sole  rights  to the  portfolio  of  products  are  covered  by a
distribution  agreement  with  Genpharm,  granting  the Company  exclusive  U.S.
distribution  rights  for  up  to 40  generic  pharmaceuticals  currently  being
developed,  some of which have  obtained U.S. FDA approval and others which have
been or will be submitted to the FDA for approval.

                                     -more-

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     Genpharm will pay all of the research and development costs associated with
the 40 products.  In return,  Resources  will pay a certain  percentage of gross
margin to Genpharm on the sales of the products.  Additionally,  Merck KGaA will
work with Resources on future  opportunities  with specific  products to further
enhance its North American generic business.

     Under the stock purchase agreement signed today, Lipha will have the right,
subject to the closing of the sale  transaction,  to designate a majority of the
Company's  Board of  Directors.  The Company's  current Board of Directors  will
designate  three  persons to continue as Directors  of the Company,  one of whom
will be Kenneth I. Sawyer (the current  Chairman,  President and Chief Executive
Officer of the Company). Lipha will designate Dr. Rudi D. Neirinckx as President
and Chief Operating  Officer of the Company.  Dr. Neirinckx has been the Head of
Business  Development  at Merck KGaA.  Mr.  Sawyer will remain the  Chairman and
Chief Executive Officer of the Company.  Lipha and its affiliates have agreed to
not engage in certain business  combinations  including the Company for a period
of three  years,  unless a majority  of the three  directors  designated  by the
Company's current board consent. Lipha will have certain rights of first refusal
to acquire equity stock of the Company in the event of future equity offerings.

     Merck  KGaA and its  affiliates  have,  as a result of and  subject  to the
closing of the transactions announced today, the right to purchase approximately
46% of the Company's  common stock.  The  completion  of the  transactions  with
Lipha,  Merck KGaA and Genpharm are subject to certain  conditions  in the stock
purchase  agreement,   including  the  obtaining  of  all  necessary  government
consents,  approval by the Company's  stockholders of the issuance of the common
stock and the election of the designated directors.  The distribution  agreement
is effective immediately, but is terminable by Genpharm if the stock transaction
does not close by July 15, 1998 and is not subject to such conditions.

     Kenneth I.  Sawyer,  Chairman,  Chief  Executive  Officer and  President of
Resources,  commented,  "The  strategic  alliance  with Merck KGaA  provides the
Company with the  opportunity  to achieve our objective of building a profitable
generic pharmaceutical business with the prospect of future growth. The alliance
will immediately add a significant number of products to our product development
pipeline,  give the  Company  additional  expertise  in  generic  pharmaceutical
marketing and manufacturing,  and significantly  reduce the Company's debt while
providing capital to explore  additional options to improve the Company's growth
prospects.  We believe in order to  compete  in  today's  intensely  competitive
generic  drug market it is  important to form  strategic  alliances  and we feel
extremely  fortunate  to form an  alliance  with a company of Merck's  heritage,
expertise and performance in the industry."

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     "This  is a  further  step to  implement  our  North-American  strategy  by
increasing our presence in the world's largest pharmaceutical market" said Prof.
Dr. Bernhard Scheuble,  designated Head of Merck's  Pharmaceutical  Business and
Deputy Member of the Executive  Board. "In the US we have seen a very successful
introduction  of  our  betablocker  Concor  (bisoprolol)  and  the  antidiabetic
Glucophage (metformin) through licensees.  This agreement now marks the start of
becoming a major player in the US generics industry."

                                     -more-

     Merck KGaA is a German specialty pharmaceuticals,  laboratory and chemicals
company  with  sales of $4.4  billion,  and  29,000  employees  in 47  countries
worldwide. Its pharmaceutical sales of $2.5 billion consists mainly of ethicals,
generics,  contrastmedia  and OTC products.  Within the Ethicals  Division Merck
spends more than 20% of its sales on R&D and has core research  expertise in CV,
CNS, oncology and metabolic disease.  Merck KGaA owns Merck-Lipha S.A., a French
ethical and generic pharmaceutical company, which owns Dey Laboratories, L.P., a
U.S. generic pharmaceutical company located in Napa Valley, California.

     Pharmaceutical  Resources, Inc. is a holding company with subsidiaries that
develop  manufacture  and distribute  generic  pharmaceuticals  products.  PRI's
principal  subsidiary,  Par Pharmaceutical,  located in Spring Valley, New York,
manufactures  and  distributes  various dosage  strengths of  approximately  100
products.

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