Exhibit 99.1
Contact:
Stephen J. Mock
Vice President, Corporate Affairs
Pharmaceutical Resources, Inc.
(201) 802-4000

            PHARMACEUTICAL RESOURCES TO ACQUIRE KALI LABORATORIES FOR
             $135 MILLION, SUBSTANTIALLY EXPANDING R&D CAPABILITIES

    WITH 14 ANDAS AWAITING APPROVAL, INCLUDING 5 FIRST-TO-FILE OPPORTUNITIES,
     AND AT LEAST 8 MORE ANDA FILINGS EXPECTED IN 2004, KALI POSSESSES DEEP
                       PIPELINE OF POTENTIAL NEW PRODUCTS
                                       ---
    BY ACQUIRING KALI, PRX WILL RETAIN 100% OF PROFIT FROM GENERIC VERSION OF
     ULTRACET(R); ACQUISITION WILL MORE THAN DOUBLE PRX'S R&D ORGANIZATION
                                       ---
       ACQUISITION EXPECTED TO ADD APPROXIMATELY $1.00 TO EPS THROUGH 2005
                                       ---
     COMPANY PROVIDES FIRST-QUARTER EARNINGS GUIDANCE; PRX EXPECTS TO REPORT
                 FIRST-QUARTER DILUTED EPS OF APPROXIMATELY $.80

SPRING  VALLEY,  NEW YORK,  APRIL 13,  2004 --  Pharmaceutical  Resources,  Inc.
(NYSE:PRX) today announced a definitive  agreement to acquire Kali Laboratories,
Inc., a generic pharmaceutical research and development (R&D) company located in
Somerset, New Jersey, for approximately $135 million in cash and warrants.  With
25 products in development,  another 14 filed and awaiting regulatory  approval,
and an R&D organization of 55 employees, the acquisition of Kali immediately and
significantly  expands  PRX's R&D  capabilities.  PRX also gains a 45,000 square
foot manufacturing facility in Somerset.

"We view this acquisition as the first step toward  significantly  expanding the
scope of our research and development capabilities, and substantially increasing
the size of our product  portfolio,"  said Scott  Tarriff,  president  and chief
executive officer of PRX. "This accretive acquisition  immediately increases our
net  number of  pending  ANDAs  from 26 to 37 and we now  expect to  submit,  or
license,  at least 20 in 2004. It also  diversifies our pipeline,  provides more
visibility with four additional  first-to-file product  opportunities,  and will
add more stability to our future earnings.  Most  importantly,  it strategically
enhances our prospects for sustained long-term growth."

With the  acquisition  of Kali,  PRX, or its marketing  partners,  now expect to
launch a total of at least 36 new  products  in 2004 and 2005.  This  represents
half the total number of products currently marketed by PRX.

EARNINGS IMPACT
The acquisition of Kali is expected to add  approximately  $1.00 to earnings per
share through 2005.  The accretion in earnings per share is dependent  primarily
upon successfully  gaining timely regulatory approval of certain significant new
products, most notably the generic version of Ultracet(R).

On April 29, PRX expects to report  first-quarter  diluted earnings per share of
approximately $.80, an increase of almost 20 percent from the same period a year
ago. This performance, however, reflects a shift in product mix since the fourth
quarter  of  2003,  and  the  delayed   introductions  of  generic  versions  of
Rebetol(R), Glucovance(R), and Catapres TTS(R).



TERMS OF THE AGREEMENT
Under the terms of the agreement,  PRX will purchase all of the capital stock of
Kali Laboratories,  Inc. The cash acquisition,  which is valued at approximately
$135  million,  will  not  require  the  approval  of  PRX's  stockholders.  The
transaction  will be accounted for using the purchase  method and is expected to
close in the second quarter of 2004.

"The entire Kali organization is very excited about the many  opportunities that
become  available  to us as new  members  of PRX," said  Veerappan  Subramanian,
Ph.D., R.Ph., president and chief executive officer of Kali. "Our willingness to
enter into this  combination  is based on the  experience  we have  gained  from
working with this  excellent  partner.  Together,  we can build a company  whose
success far exceeds what either of us could achieve individually. We believe the
resources and  capabilities  that PRX can provide will help us to accelerate our
development efforts and bring more products to market faster."

"Over the past two years,  we have worked  closely with our partners at Kali and
have developed a great respect and  appreciation for their  capabilities,"  said
Mr. Tarriff. "We welcome our new colleagues and look forward to working together
to keep PRX one of the fastest growing generic pharmaceutical companies."

Kali  develops  generic  products  that  are  commercialized  by  its  marketing
partners.  Many of the  products  in Kali's  pipeline  are  already  subject  to
licensing  agreements  and will be marketed by companies  other than PRX.  These
agreements generally provide for Kali to also manufacture these products for its
partners.  For  those  products  developed  by Kali  that PRX does not  directly
market,  PRX will receive  royalty income.  The royalties  received will vary by
product  agreement,  ranging  from 10  percent of sales to 60 percent of the net
profit generated by sales of the particular product.

Kali possesses a demonstrated  competency for successful product development and
timely regulatory  submissions and approvals.  Several of Kali's Abbreviated New
Drug Application  (ANDA) submissions have received  regulatory  approval and two
are currently marketed by partners from whom Kali receives royalty income. Among
these  products  is  torsemide,  the  generic  version of  Demadex(R),  which is
currently marketed by PRX. Kali expects its marketing partners to launch as many
as six more  products in 2004,  and  potentially  more than a dozen in 2005.  Of
Kali's  14  ANDAs  currently  awaiting  approval  by  the  U.S.  Food  and  Drug
Administration  (FDA),  three are for products that PRX plans to market.  One of
these is tramadol hydrochloride tablets with acetaminophen,  the generic version
of Ultracet(R). By acquiring Kali, PRX will now retain 100 percent of the profit
on torsemide, and the three products awaiting regulatory approval.

PRX and Kali are currently  involved in patent litigation with Johnson & Johnson
regarding Ultracet(R). The Companies believe that Kali's ANDA is the first to be
filed for  Ultracet(R),  and that PRX is entitled to up to 180 days of marketing
exclusivity for its generic version. If successful in this patent challenge, PRX
anticipates  marketing a generic  version of  Ultracet(R)  in late 2004 or early
2005.

Among  Kali's 14 pending  ANDAs,  four  others are also  believed  to  represent
first-to-file opportunities entitling Kali's strategic partner to up to 180 days
of marketing  exclusivity.  These  products  include  metaxalone  400 mg tablets
(Skelaxin(R));  ondansetron  hydrochloride (HCl) orally  disintegrating  tablets
(Zofran ODT(R)); quinapril HCl/hydrochlorothiazide tablets (Accuretic(TM));  and
mirtazapine  orally  disintegrating  45 mg tablets  (RemeronSolTab(R)).  Each of
these four  products is already  subject to licensing  agreements  with partners
other than PRX.  Therefore,  PRX will  receive  royalty  income from the sale of
these products.



Kali is also working on  approximately  12 R&D projects  that are not  currently
out-licensed  to  marketing   partners,   including  PRX.  These  products,   if
successfully  developed,  will be marketed by PRX. Going forward, PRX expects to
utilize Kali to develop products principally for its own new product pipeline.

The  acquisition  of  Kali  provides  PRX  with   additional   sustained-release
technology  and  oral  disintegrating  tablet  technology.  Kali's  dosage  form
capabilities include oral solid dose, powders, and gels.

PRX recognizes that internal  development of successful new products is critical
to achieving its goal of  sustainable  growth over the long term.  In 2003,  the
Company's  investment in R&D increased 37 percent to a record $24.6 million. The
substantial increase in R&D underscores PRX's commitment to identify,  formulate
and develop a continuing  stream of new products.  With the acquisition of Kali,
PRX now believes that its investment in R&D could approach $55 million in 2004.

PRX has 26 ANDAs currently  awaiting  approval by the FDA. Among these 26 drugs,
PRX believes that several may represent  first-to-file  opportunities  entitling
the Company, or its strategic partner,  up to 180 days of marketing  exclusivity
or  co-exclusivity.  These  products  include:  olanzapine  20 mg  (Zyprexa(R));
latanoprost (Xalatan(R)); and tramadol with acetaminophen (Ultracet(R)).  It is,
however,  difficult to know with certainty that an ANDA filing has  exclusivity,
or shared exclusivity, until final approval is received from the FDA.

PRX also plans to submit its first New Drug Application (NDA) early in the third
quarter of 2004 for a next-generation megestrol acetate oral suspension product.
If cleared for  marketing,  the product will utilize the  Megace(R)  brand name,
which Par licensed from Bristol-Myers Squibb Company. Through developer Advancis
Pharmaceutical  Corp., a second 505(b)(2) NDA submission is planned for 2005. If
successfully  developed,  amoxicillin  PULSYS(TM)  will  represent a  once-daily
version of the antibiotic  amoxicillin  that is administered for fewer days with
improved therapeutic effect.

CONFERENCE CALL
PRX has scheduled a conference call with investment analysts for Tuesday,  April
13 at 8:30 a.m. EDT. Management will be available to discuss the acquisition and
answer  questions.  PRX invites  investors and the general public to listen to a
webcast of the conference  call.  Access to the live webcast can be made via the
Company's website at HTTP://WWW.PARPHARM.COM. A digital replay of the conference
call will be available  one hour after the call until close of  business,  April
16. The dial-in number for the replay is 1-877-519-4471 for domestic callers and
1-973-341-3080 for international callers. The access number is 4689862.

Pharmaceutical Resources, Inc., a holding company, develops,  manufactures,  and
distributes  generic  pharmaceuticals  through its wholly owned subsidiary,  Par
Pharmaceutical.  Through its  FineTech  unit,  PRX also  develops  and  utilizes
synthetic chemical processes to design and develop intermediate ingredients used
in the  production of finished  products for the  pharmaceutical  industry.  PRX
currently  manufactures  and  distributes  more than 170 products,  representing
various  dosage  strengths  of 72 drugs.  For press  release  and other  Company
information, visit HTTP://WWW.PARPHARM.COM.

Certain statements in this press release constitute "forward-looking statements"
within the meaning of the Private  Securities  Litigation Reform Act of 1995. To
the extent any statements made in this news release contain  information that is
not historical, these statements are essentially forward-looking and are subject
to risks and  uncertainties,  including  the  closing  of the Kali  acquisition,
difficulty of predicting  FDA filings and  approvals,  acceptance and demand for
new pharmaceutical products, the impact of competitive products and pricing, new
product development and launch, reliance on key strategic alliances, uncertainty
of patent  litigation  filed  against us,  availability  of raw  materials,  the
regulatory  environment,  fluctuations in operating  results and other risks and
uncertainties  detailed  from  time to time in the  Company's  filings  with the
Securities and Exchange Commission,  such as the Company's Form 10-K, Form 10-Q,
and Form 8-K reports.

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