EXHIBIT 10.2

                                 FIRST AMENDMENT
                            DATED AS OF JUNE 9, 2004

                                       TO

                            STOCK PURCHASE AGREEMENT
                            DATED AS OF APRIL 2, 2004

      This FIRST AMEMDMENT, dated as of June 9, 2004 (this "Amendment"),  to the
STOCK PURCHASE  AGREEMENT,  dated as of April 2, 2004 (the "Agreement"),  by and
among  Pharmaceutical  Resources,  Inc., a Delaware  corporation  ("PRI"),  Kali
Laboratories, Inc., a New Jersey corporation ("Kali"), VGS Holdings, Inc., a New
Jersey  corporation  ("VGS"),  and the  Kali  Shareholders  (as  defined  in the
Agreement).  Each of PRI,  Kali,  VGS and the Kali  Shareholders  is referred to
herein  individually,   as  a  "Party"  and  collectively,   as  the  "Parties."
Capitalized terms used and not defined herein have the meanings set forth in the
Agreement.

                                   WITNESSETH:

      WHEREAS,  the Parties  desire to amend the  Agreement  as provided in this
Amendment; and

      WHEREAS, Section 12.10 of the Agreement permits such an amendment with the
written consent of PRI and the Kali Shareholders' Rep.

      NOW, THEREFORE, the Parties hereby agree as follows:

      SECTION 1. DEFINITIONS.

           (a) The following  definitions  are hereby  deleted from Section 1 of
the Agreement: "Market Price Payment(s)" and "Market Value".

           (b) The  definition of "Initial ANDA  Threshold" is hereby amended by
(i) replacing the term "drug  technology  substantially  developed by Kali" with
the term "drug technology  substantially developed by Kali (or its successor(s),
by merger,  consolidation or otherwise)" and (ii) adding the following  sentence
at the end of such definition:

      "Notwithstanding  the  forgoing,  the  date  by  which  the  Initial  ANDA
      Threshold is to be achieved shall be extended,  on a day-by-day basis, for
      any days during such period as to which the FDA or any other  Governmental
      Authority prohibits or materially  restricts the operation of the business
      of  Kali   (other  than  as  a  result  of  an  act  or  omission  of  Mr.
      Subramanian)."

           (c) The  definition of "Second ANDA  Threshold" is hereby  amended by
(i) deleting the words "at least" that precede the words  "twenty (20) ANDAs" in
such  definition,   (ii)  replacing  the  term  "drug  technology  substantially
developed  by Kali" with the term "drug  technology  substantially  developed by



Kali (or its  successor(s),  by merger,  consolidation  or otherwise)" and (iii)
adding the following sentence at the end of such definition:

      "Notwithstanding the forgoing, the date by which the Second ANDA Threshold
      is to be achieved shall be extended,  on a day-by-day  basis, for any days
      during such period as to which the FDA or any other Governmental Authority
      prohibits or  materially  restricts  the operation of the business of Kali
      (other than as a result of an act or omission of Mr. Subramanian)."

           (d) The following  definitions  are hereby added,  in the appropriate
alphabetical order, to Section 1 of the Agreement:

           "Third  ANDA  Payment"  shall have the  meaning  set forth in Section
      2.2(iii) hereof.

           "Third  ANDA  Threshold"  means the filing  (irrespective  of whether
      accepted for filing by the FDA), in good faith,  with the FDA by Kali, PRI
      (or any of its Affiliates) or any Kali Development  Partner, in each case,
      with respect to a drug technology  substantially developed by Kali (or its
      successor(s),   by  merger,  consolidation  or  otherwise),  of  at  least
      twenty-seven  (27) ANDAs  (including the ANDAs required in accordance with
      the  achievement  of the  Initial  ANDA  Threshold  and  the  Second  ANDA
      Threshold)  during the period from  January 1, 2004 until the fourth (4th)
      anniversary  of the  Closing  Date;  provided,  however,  that if at least
      twenty-four  (24) of such  ANDAs have been filed with the FDA prior to the
      date that is  forth-eight  (48) months from the Closing Date, any new drug
      product that Kali has completed, or is actively conducting,  a Biostudy in
      respect  thereof as of such  period  shall count as an ANDA filed with the
      FDA if such new drug  product  is in fact  later  filed with the FDA on or
      prior to the later of (i) fifty-four (54) month-anniversary of the Closing
      Date  or  (ii)  the  Subramanian  Termination  Date.  Notwithstanding  the
      forgoing,  the date by which the Third ANDA  Threshold  is to be  achieved
      shall be extended,  on a day-by-day basis, for any days during such period
      as to which  the FDA or any  other  Governmental  Authority  prohibits  or
      materially  restricts the operation of the business of Kali (other than as
      a result of an act or omission of Mr. Subramanian).

                                      -2-


      SECTION 2. AMENDMENTS.

           (a)  Section  2.2(a)(iii)  of the  Agreement  shall be deleted in its
entirety and replaced with the following:

                "(iii) pay to the Kali Shareholders an additional  $5,000,000 in
      cash (the "Third ANDA  Payment")  if,  following  the Closing,  Kali shall
      achieve the Third ANDA Threshold."

           (b) Section  2.2(a)(iv) of the  Agreement  shall be amended to delete
the reference to $57.92 and to replace it with "$47.00".

           (c) Section 2.2(b) of the Agreement  shall be amended by deleting the
first  sentence  of such  Section  in its  entirety  and  replacing  it with the
following:

                "The Cash Purchase  Price,  as such may be adjusted  pursuant to
      Sections 2.2(d) and 2.4 hereof, the Warrants, the Initial ANDA Payment (if
      any), the Second ANDA Payment (if any) and the Third ANDA Payment (if any)
      shall be allocated among the Kali  Shareholders in the manner set forth on
      Schedule 2.2(b) hereto."

           (d) Section 2.2(e) of the Agreement  shall be deleted in its entirety
and replaced with the following:

           "(e) ANDA  Payments.  The Initial ANDA Payment  shall be paid by wire
transfer to the Kali Shareholders  within ten (10) Business Days of, and subject
to, the achievement of the Initial ANDA  Threshold.  The Second ANDA Payment (if
any) shall be paid by wire  transfer  to the Kali  Shareholders  within ten (10)
Business Days of, and subject to, the  achievement of the Second ANDA Threshold.
The Third  ANDA  Payment  (if any)  shall be paid by wire  transfer  to the Kali
Shareholders  within five (5) Business Days of, and subject to, the  achievement
of the Third ANDA Threshold,  the later of (i) the achievement of the Third ANDA
Threshold  and  (ii)  the  second  (2nd)   anniversary   of  the  Closing  Date.
Notwithstanding the foregoing, neither the Initial ANDA Payment, the Second ANDA
Payment nor the Third ANDA  Payment  shall be due and payable if, at or prior to
the time that the applicable condition to such payment shall have otherwise been
achieved,  a material breach of Sections 6.4, 6.5, 6.9 or 6.10 hereof shall have
occurred.

           (f) The second  sentence of Section 2.5(b) of the Agreement  shall be
amended by deleting the term "Market  Price  Payment" and  replacing it with the
term "Third ANDA Payment".

           (g) The first  sentence  of Section  6.20 of the  Agreement  shall be
amended by deleting the  reference to "thirty (30) months" and replacing it with
"forty-eight (48) months".

                                      -3-


           (h) The ninth  sentence  of  Section  7.4 of the  Agreement  shall be
amended by deleting the term "Market Price Payment(s)" and replacing it with the
term "Third ANDA Payment".

           (i) The requirement  that each Kali  shareholder  execute and deliver
certificates of Non-Foreign  Status  certifying that such  Shareholders  are not
foreign Persons subject to withholding under Code Section 1445, shall be deleted
from Section 2.3(c)(i).

           SECTION 3. EFFECT OF AMENDMENT. Upon execution of this Amendment, the
Agreement shall be, and be deemed to be, amended in accordance  herewith and the
respective rights, limitations,  obligations, duties, liabilities and immunities
of the Parties shall hereafter be determined,  exercised and enforced subject in
all respects to such  amendments,  and all the terms of this Amendment  shall be
and be deemed to be part of the terms of the Agreement for any and all purposes.
Except as expressly amended by this Amendment,  the Agreement is in all respects
ratified and confirmed,  and all the terms,  provisions  and conditions  thereof
shall be and remain in full force and effect.

      SECTION 4. BINDING  EFFECT.  The  provisions  of this  Amendment  shall be
binding upon and inure to the benefit of the respective successors and permitted
assigns of the Parties.

      SECTION  5.  GOVERNING  LAW.  This  Amendment  shall be  governed  by, and
construed in accordance with, the laws of the State of New York.

      SECTION 6.  EXECUTION IN  COUNTERPARTS.  This Amendment may be executed in
counterparts,  each of which when so executed  shall be deemed to be an original
and all of  which  when  taken  together  shall  constitute  one  and  the  same
Amendment.  Delivery of an  executed  counterpart  of a  signature  page to this
Amendment by  telecopier  shall be effective as delivery of a manually  executed
counterpart of this Amendment.

                        [NEXT PAGE IS THE SIGNATURE PAGE]

                                      -4-


      IN WITNESS WHEREOF,  each of PRI and the Kali Shareholders' Rep, on behalf
of Kali,  VGS and the Kali  Shareholders,  has caused this  Amendment to be duly
executed and delivered as of the date hereof.

                                PHARMACEUTICAL RESOURCES, INC.


                                By: /s/ Scott Tarriff
                                    --------------------------------------------
                                    Name:  Scott Tarriff
                                    Title: President and Chief Executive Officer



                                Kali Shareholders' Rep:


                                /s/ Veerappan Subramanian, Ph.D
                                ------------------------------------------------
                                Veerappan Subramanian, Ph.D.

                                      -5-