EXHIBIT (10)(a)
                                FOURTH AMENDMENT


     FOURTH  AMENDMENT,  dated as of July 13,  2001,  among WEST  PHARMACEUTICAL
SERVICES,  INC., a  Pennsylvania  corporation  (the  "Company"),  the direct and
indirect  subsidiaries  of the  Company  listed on the  signature  pages  hereto
(together with the Company,  collectively,  the "Borrowers"),  the several banks
and other financial institutions parties to the Credit Agreement (as hereinafter
defined)  (collectively,  the "Banks"),  and PNC BANK, NATIONAL ASSOCIATION,  as
Agent for the Banks (in such capacity, the "Agent").

                              W I T N E S S E T H:
                               - - - - - - - - - -


     WHEREAS,  the  Borrowers,  the Banks and the Agent are  parties to a Credit
Agreement,  dated as of July 26, 2000 (as heretofore  amended,  supplemented  or
otherwise modified, the "Credit Agreement");

     WHEREAS, pursuant to Section 2.14(d) of the Credit Agreement, the Borrowers
have  requested  an  extension  of the  364 Day  Commitments  under  the  Credit
Agreement from July 24, 2001 until July 22, 2002;

     WHEREAS,  each of the Banks  other than those  listed on Schedule II hereto
(those Banks listed on Schedule II hereto, collectively, the "Declining Banks"),
has agreed to extend its 364 Day Commitment until July 22, 2002 on the terms and
subject to the conditions set forth herein; and

     WHEREAS, Banks holding more than 51% of the 364 Day Commitments have agreed
to extend their 364 Day Commitment on the terms described herein, including that
the Applicable Margin be amended as provided herein.

     NOW,   THEREFORE,   in   consideration  of  the  foregoing  and  for  other
consideration,  the receipt and sufficiency of which is hereby acknowledged, the
parties hereto, intending to be legally bound, hereby agree as follows:

     1. Defined Terms.  Unless  otherwise  defined herein,  terms defined in the
Credit Agreement are used herein as therein defined.


     2. Extension of 364  Commitment.  Effective on and as of July 25, 2001, the
364 Day Commitments of each of the Banks other than the Declining Banks shall be
extended  until July 22,  2002.  As  provided  in Section  2.14(d) of the Credit
Agreement,  on July 24, 2001, the Borrowers shall pay to each Declining Bank the
principal amount of the 364 Day Loans and all interests,  fees and other amounts
owed to such Declining Bank with respect to the 364 Day Facility.






     3.  Amendments to Credit Agreement.
         ------------------------------

     (a)  Effective on and as of July 25, 2001,  the  definition  of  Applicable
Margin  contained in Section 1.1 of the Credit  Agreement  is hereby  amended by
deleting  the  table  set  forth  therein  and  inserting  in lieu  thereof  the
following:

Level             Leverage Ratio            364 Day Facility  Five Year Facility
--------------------------------------------------------------------------------
I                 Less than or equal to            0.725%            0.675%
                  0.35 to 1.0
II                Less than or equal to 0.45       0.825%            0.775%
                  to 1.0 but greater than
                  0.35 to 1.0
III               Greater than 0.45 to 1.0          1.05%              1.0%


     (b)  Effective on and as of July 25, 2001,  the  definition of Facility Fee
Rate  contained  in Section  1.1 of the Credit  Agreement  is hereby  amended by
deleting  the  table  set  forth  therein  and  inserting  in lieu  thereof  the
following:

Level             Leverage Ratio            364 Day Facility  Five Year Facility
--------------------------------------------------------------------------------
I                 Less than or equal to              0.15%             0.20%
                  0.35 to 1.0
II                Less than or equal to 0.45         0.175%            0.225%
                  to 1.0 but greater than
                  0.35 to 1.0
III               Greater than 0.45 to 1.0           0.20%             0.25%

     (c)  Effective  on  and as of  July  25,  2001,  Schedule  I to the  Credit
Agreement is hereby  deleted in its entirety and the Schedule I attached  hereto
is hereby inserted in lieu thereof.


     4.  Representations  and  Warranties.  The Borrowers  hereby  represent and
warrant to the Banks and the Agent that:


     (a) There exists no Default or Event of Default under the Credit  Agreement
as amended hereby;

     (b) The  representations  and warranties  made in the Credit  Agreement are
true and  correct in all  material  respects  on and as of the date hereof as if
made on and as of the date hereof; and

     (c) ______ The execution and delivery of this Amendment by and on behalf of
the Borrowers has been duly authorized by all requisite  action on behalf of the
Borrowers and this Amendment constitutes the legal, valid and binding obligation
of the Borrowers,  enforceable against them in accordance with its terms, except
as  enforceability  may  be  limited  by  applicable   bankruptcy,   insolvency,
fraudulent conveyance, reorganization,  moratorium or similar laws affecting the
enforcement of creditors' rights generally and by general  equitable  principles
(whether enforcement is sought by proceedings in equity or at law).

     5. Effectiveness; Declining Banks. This Amendment shall become effective on
the date on which the Agent shall have  received  (a)  counterparts  hereof duly
executed  by the  Borrowers  and  each  Bank  that  is  extending  its  364  Day
Commitment,  (b) an extension fee for the benefit of each Bank that is extending
its 364 Day Commitment in the amount of 10 basis points (0.10%) on the amount of
such Bank's 364 Day Commitment  and (c) for the account of PNC Capital  Markets,
Inc., such arrangement fees as shall have been agreed to with the Borrowers.

     6. Limited  Effect.  Except as  expressly  amended by this  Amendment,  the
Credit  Agreement shall continue to be, and shall remain,  unaltered and in full
force and effect in accordance  with its terms and the Borrowers  hereby confirm
all of the provisions of the Credit Agreement and the other Loan Documents.

     7.  Release.  Recognizing  and in  consideration  of  certain  of the Banks
extending  their 364 Day  Commitments,  each of the Borrowers  hereby waives and
releases all of the Banks and the Agent and their officers,  attorneys,  agents,
and employees from any liability,  suit,  damage,  claim, loss or expense of any
kind or nature  whatsoever and howsoever  arising that such Borrower ever had or
now has  against  any of them  arising  out of or  relating to any Bank's or the
Agent's acts or omissions with respect to this Amendment,  the Credit Agreement,
the other Loan Documents or any other matters described or referred to herein or
therein.

     8. Miscellaneous.


     (a)  Expenses.  Each of the  Borrowers  agrees  to pay  all of the  Agent's
reasonable  out-of-pocket  expenses incurred in connection with the preparation,
negotiation and execution of this Amendment and the other documents  executed in
connection  herewith,  including,  without  limitation,  the reasonable fees and
expenses of Ballard Spahr Andrews & Ingersoll, LLP.

     (b)  Governing  Law. This  Amendment  shall be governed by and construed in
accordance with the laws of the Commonwealth of
Pennsylvania.

     (c) Successor and Assigns. The terms and provisions of this Amendment shall
be binding upon and shall inure to the benefit of the  Borrowers,  the Agent and
the Banks and their respective successors and assigns.

     (d)   Counterparts.   This  Amendment  may  be  executed  in  one  or  more
counterparts,  each of which shall be deemed to be an original, and all of which
shall constitute one and the same instrument.

     (e)  Headings.  The  headings of any  paragraph of this  Amendment  are for
convenience only and shall not be used to interpret any provision hereof.

(f)  Modifications.  No  modification  hereof or any agreement  referred to
herein shall be binding or enforceable unless in writing and signed on behalf of
the party against whom enforcement is sought.





     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be
duly executed and delivered by their proper and duly  authorized  officers as of
the day and year first above written.

                                              WEST PHARMACEUTICAL SERVICES, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title: ___________________________


                                              WEST PHARMACEUTICAL SERVICES
                                              OF FLORIDA, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title: ___________________________


                                              WEST PHARMACEUTICAL SERVICES
                                              LAKEWOOD, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              WEST PHARMACEUTICAL SERVICES
                                              GROUP LIMITED


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              PACO LABORATORIES, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              WEST PHARMACEUTICAL SERVICES
                                              CANOVANAS, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              WEST PHARMACEUTICAL SERVICES
                                              OF DELAWARE, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              WEST PHARMACEUTICAL SERVICES
                                              VEGA ALTA, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              WEST PHARMACEUTICAL
                                              CLEVELAND, INC.


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________







                                              PNC BANK, NATIONAL ASSOCIATION,
                                              as a Bank and as Agent


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              FIRST UNION NATIONAL BANK


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________



                                              DRESDNER BANK, AG, NEW YORK AND
                                              GRAND CAYMAN BRANCHES


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________


                                              NATIONAL CITY BANK


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________







                                              THE CHASE MANHATTAN BANK


                                              By:  _____________________________
                                              Name:_____________________________
                                              Title_____________________________


                                              MELLON BANK, N.A.,


                                              By:   ____________________________
                                              Name: ____________________________
                                              Title:____________________________





                                   SCHEDULE I
                        BANKS AND COMMITMENT INFORMATION
Bank and  Lending Office(s)                              Commitments


                                                             

                                    364 Day          Five Year         Swing Line
                                    ----------------------------------------------
PNC Bank, National Association      $14,444,444.45   $15,555,555.55    $15,000,000
1000 Westlakes Dr., Suite 200
Berwyn, PA   19312
Attention:  Frank Pugliese
Facsimile:  610-725-5799

First Union National Bank           $10,833,333.33   $11,666,666.67    $0
1339 Chestnut Street
12th Floor, PA 4830
Philadelphia, PA  19107
Attention:  Jeanette Griffin
Facsimile:  215-973-4156

Dresdner Bank AG, New York          $0               $11,666,666.67    $0
and Grand Cayman Branches
75 Wall Street
New York, NY  10005
Attention:  Richard Morris
Facsimile:  212-429-2524

National City Bank                  $9,629,629.63    $10,370,370.37    $0
One South Board Street, 13th Floor
Philadelphia, PA  19107
Attention:  Thomas McDowell
Facsimile:  267-256-40001

The Chase Manhattan Bank            $0               $10,370,370.37    $0
One Riverfront Plaza, Second Floor
Newark, NJ  07102
Attention:  Thomas Conroy
Facsimile:  973-353-6158

Mellon Bank, N.A.                   $9,629,629.63    $10,370,370.37    $0
610 W. Germantown Pike, Suite 200
Plymouth Meeting, PA  19462
Attention:  Frank McGrane
Facsimile:  610-941-4136
                                    ------------------------------------------------
Total Commitments                   $44,537,037.04   $70,000,000       $15,000,000






                                   SCHEDULE II

                                 DECLINING BANKS


Dresdner Bank, AG, New York and Grand Cayman Branches
The Chase Manhattan Bank