AMGEN INC
10-Q, 1998-08-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>
 
                                 UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON D.C. 20549

                                   FORM 10-Q



(Mark One)
[ X ]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
       EXCHANGE ACT OF 1934

       For the quarterly period ended June 30, 1998

                                       OR

[   ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
       SECURITIES EXCHANGE ACT OF 1934


Commission file number 000-12477


                                   AMGEN INC.
             (Exact name of registrant as specified in its charter)

<TABLE> 
<CAPTION> 

          Delaware                                              95-3540776
- -------------------------------                       -----------------------------
<S>                                                          <C> 
(State or other jurisdiction of                              (I.R.S. Employer
incorporation or organization)                              Identification No.)

</TABLE> 

One Amgen Center Drive, Thousand Oaks, California       91320-1789
- --------------------------------------------------------------------------
    (Address of principal executive offices)           (Zip Code)


Registrant's telephone number, including area code:     (805) 447-1000


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months  (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.        Yes  X    No

As of June 30, 1998, the registrant had 253,927,244 shares of Common Stock,
$.0001 par value, outstanding.
<PAGE>
 
                                   AMGEN INC.

                                     INDEX

<TABLE>
<CAPTION>

                                                                                       Page No.
<S>          <C>                                                                         <C>

PART I       FINANCIAL INFORMATION

             Item 1.  Financial Statements............................................... 3

                Condensed Consolidated Statements of
                Operations - three and six months
                ended June 30, 1998 and 1997............................................. 4

                Condensed Consolidated Balance Sheets -
                June 30, 1998 and December 31, 1997...................................... 5

                Condensed Consolidated Statements of
                Cash Flows - six months
                ended June 30, 1998 and 1997............................................. 6

                Notes to Condensed Consolidated Financial
                Statements............................................................... 8

             Item 2.  Management's Discussion and Analysis
                      of Financial Condition and Results of
                      Operations.........................................................15


PART II      OTHER INFORMATION

             Item 1.  Legal Proceedings..................................................23

             Item 4.  Submission of Matters to a Vote of
                      of Security Holders................................................24

             Item 5.  Other Information..................................................25

             Item 6.  Exhibits and Reports on Form 8-K...................................26

             Signatures..................................................................27

             Index to Exhibits...........................................................28

</TABLE>

                                       2
<PAGE>
 
                         PART I - FINANCIAL INFORMATION


Item 1.   Financial Statements

     The information in this report for the three and six months ended June 30,
1998 and 1997 is unaudited but includes all adjustments (consisting only of
normal recurring accruals) which Amgen Inc. ("Amgen" or the "Company") considers
necessary for a fair presentation of the results of operations for those
periods.

     The condensed consolidated financial statements should be read in
conjunction with the Company's financial statements and the notes thereto
contained in the Company's Annual Report on Form 10-K for the year ended
December 31, 1997.

     Interim results are not necessarily indicative of results for the full
fiscal year.

                                       3
<PAGE>
 
                                   AMGEN INC.

                CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

                      (In millions, except per share data)
                                  (Unaudited)

<TABLE>
<CAPTION>
                                                         Three Months Ended                  Six Months Ended
                                                               June 30,                           June 30,
                                                        1998             1997             1998              1997
                                                       ------           ------          --------          --------
<S>                                                    <C>              <C>             <C>               <C>
Revenues:
 Product sales.......................................  $611.2           $566.7          $1,178.0          $1,102.7
 Corporate partner revenues..........................    29.9             40.0              52.5              67.4
 Royalty income......................................    15.8             13.8              31.8              25.9
                                                       ------           ------          --------          --------
   Total revenues....................................   656.9            620.5           1,262.3           1,196.0
                                                       ------           ------          --------          --------
Operating expenses:
 Cost of sales.......................................    83.9             76.8             162.9             148.8
 Research and development............................   152.4            145.4             304.9             293.1
 Marketing and selling...............................    74.3             81.8             141.1             149.9
 General and administrative..........................    47.7             43.7              94.0              88.1
 Loss of affiliates, net.............................    10.2             12.1              16.4              20.6
                                                       ------           ------          --------          --------
   Total operating expenses..........................   368.5            359.8             719.3             700.5
                                                       ------           ------          --------          --------
Operating income.....................................   288.4            260.7             543.0             495.5
                                                       ------           ------          --------          --------
Other income (expense):
 Interest and other income...........................    23.9             18.0              39.1              33.9
 Interest expense, net...............................    (3.3)            (0.4)             (5.5)             (0.7)
                                                       ------           ------          --------          --------
   Total other income
    (expense)........................................    20.6             17.6              33.6              33.2
                                                       ------           ------          --------          --------
Income before income taxes...........................   309.0            278.3             576.6             528.7

Provision for income taxes...........................    92.7             77.8             173.0             147.9
                                                       ------           ------          --------          --------
Net income...........................................  $216.3           $200.5          $  403.6          $  380.8
                                                       ======           ======          ========          ========
Earnings per share:
 Basic...............................................  $ 0.85           $ 0.76          $   1.58          $   1.44
 Diluted.............................................  $ 0.82           $ 0.72          $   1.53          $   1.37

Shares used in calculation
 of earnings per share:
 Basic...............................................   253.9            265.3             255.1             265.3
 Diluted.............................................   262.5            277.5             263.2             277.8
</TABLE>
                            See accompanying notes.

                                       4
<PAGE>
 
                                   AMGEN INC.

                     CONDENSED CONSOLIDATED BALANCE SHEETS

                      (In millions, except per share data)
                                  (Unaudited)

<TABLE>
<CAPTION>
                                                                      June 30,          December 31,
                                                                        1998                1997
                                                                      --------            --------
                                      ASSETS
<S>                                                                   <C>                <C>
Current assets:
  Cash and cash equivalents........................................   $  158.0           $  239.1
  Marketable securities............................................      863.3              787.4
  Trade receivables, net...........................................      291.2              269.0
  Inventories......................................................      113.3              109.2
  Other current assets.............................................      141.7              138.8
                                                                      --------           --------
    Total current assets...........................................    1,567.5            1,543.5

Property, plant and equipment at cost, net.........................    1,349.5            1,186.2
Investments in affiliated companies................................      117.1              116.9
Other assets.......................................................      252.7              263.6
                                                                      --------           --------
                                                                      $3,286.8           $3,110.2
                                                                      ========           ========

                  LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable.................................................   $   85.0           $  103.9
  Commercial paper.................................................       99.5                  -
  Accrued liabilities..............................................      671.8              608.0
  Current portion of long-term debt................................       11.0               30.0
                                                                      --------           --------
    Total current liabilities......................................      867.3              741.9

Long-term debt.....................................................      223.0              229.0
Contingencies

Stockholders' equity:
  Preferred stock; $.0001 par value; 5 shares authorized;
    none issued or outstanding.....................................          -                  -
  Common stock and additional paid-in capital; $.0001 par
    value; 750 shares authorized; outstanding - 253.9
    shares in 1998 and 258.3 shares in 1997........................    1,306.7            1,196.1
  Retained earnings................................................      889.8              943.2
                                                                      --------           --------
      Total stockholders' equity...................................    2,196.5            2,139.3
                                                                      --------           --------
                                                                      $3,286.8           $3,110.2
                                                                      ========           ========
</TABLE>
                            See accompanying notes.

                                       5
<PAGE>
 
                                   AMGEN INC.

                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

                                 (In millions)
                                  (Unaudited)
<TABLE>
<CAPTION>
                                                                                 Six Months Ended
                                                                                     June 30,
                                                                            1998                 1997
                                                                          -------               -------
<S>                                                                       <C>                   <C> 
Cash flows from operating activities:
 Net income........................................................       $ 403.6               $ 380.8
 Depreciation and amortization.....................................          72.7                  65.1
 Loss of affiliates, net...........................................          16.4                  20.6
 Cash provided by (used in):
  Trade receivables, net...........................................         (22.2)                 (3.4)
  Inventories......................................................          (4.1)                 (8.2)
  Other current assets.............................................           3.7                  16.6
  Accounts payable.................................................         (18.9)                  7.6
  Accrued liabilities..............................................          63.8                  (9.2)
                                                                           ------                ------
    Net cash provided by operating activities......................         515.0                 469.9
                                                                           ------                ------
 
Cash flows from investing activities:
 Purchases of property, plant and equipment........................        (236.0)               (195.0)
 Proceeds from maturities of marketable
   securities......................................................             -                 184.3
 Proceeds from sales of marketable securities                               272.1                 312.4
 Purchases of marketable securities................................        (348.5)               (483.0)
 Other.............................................................          (6.2)                  0.5
                                                                           ------                ------
    Net cash used in investing activities..........................        (318.6)               (180.8)
                                                                           ------                ------
</TABLE>

                            See accompanying notes.

                            (Continued on next page)

                                       6
<PAGE>
 
                                   AMGEN INC.

          CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

                                 (In millions)
                                  (Unaudited)

<TABLE>
<CAPTION>
                                                                                Six Months Ended
                                                                                    June 30,
                                                                           1998                 1997
                                                                          ------               ------
<S>                                                                      <C>                   <C> 
Cash flows from financing activities:
 Increase in commercial paper......................................      $  99.5               $    -
 Repayment of long-term debt......................................         (25.0)               (78.2)
 Proceeds from issuance of long-term debt.........................             -                100.0
 Net proceeds from issuance of common
   stock upon the exercise of stock options.......................          91.8                 59.0
 Tax benefits related to stock options............................          30.0                 28.6
 Repurchases of common stock......................................        (457.0)              (210.9)
 Other............................................................         (16.8)               (25.9)
                                                                          ------               ------
    Net cash used in financing activities.........................        (277.5)              (127.4)
                                                                          ------               ------
 
(Decrease) increase in cash and cash
  equivalents.....................................................         (81.1)               161.7
 
Cash and cash equivalents at beginning of
  period..........................................................         239.1                169.3
                                                                          ------               ------
Cash and cash equivalents at end of period........................        $158.0               $331.0
                                                                          ======               ======
</TABLE>
                            See accompanying notes.

                                       7
<PAGE>
 
                                   AMGEN INC.

              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                                 June 30, 1998


1.   Summary of significant accounting policies

  Business

     Amgen Inc. ("Amgen" or the "Company") is a global biotechnology company
that discovers, develops, manufactures and markets human therapeutics based on
advances in cellular and molecular biology.

  Principles of consolidation

     The consolidated financial statements include the accounts of the Company
and its wholly owned subsidiaries as well as affiliated companies for which the
Company has a controlling financial interest and exercises control over their
operations ("majority controlled affiliates").  All material intercompany
transactions and balances have been eliminated in consolidation.  Investments in
affiliated companies which are 50% or less owned and where the Company exercises
significant influence over operations are accounted for using the equity method.
All other equity investments are accounted for under the cost method.  The
caption "Loss of affiliates, net" includes Amgen's equity in the operating
results of affiliated companies and the minority interest others hold in the
operating results of Amgen's majority controlled affiliates.

  Inventories

     Inventories are stated at the lower of cost or market.  Cost is determined
in a manner which approximates the first-in, first-out (FIFO) method.
Inventories are shown net of applicable reserves and allowances.  Inventories
consist of the following (in millions):

<TABLE>
<CAPTION>
                                              June 30,         December 31,
                                               1998                1997
                                              ------              -------
          <S>                                 <C>                 <C>
          Raw materials.............          $ 17.6              $ 18.7
          Work in process...........            49.6                53.6
          Finished goods............            46.1                36.9
                                              ------              ------
                                              $113.3              $109.2
                                              ======              ======
</TABLE>

  Product sales

     Product sales consist of three products, EPOGEN(R) (Epoetin alfa),
NEUPOGEN(R) (Filgrastim) and INFERGEN(R) (Interferon alfacon-1).

     The Company has the exclusive right to sell Epoetin alfa for dialysis,
diagnostics and all non-human uses in the United States.  The Company sells
Epoetin alfa under the brand name EPOGEN(R).

                                       8
<PAGE>
 
 Amgen has granted to Ortho Pharmaceutical Corporation, a subsidiary of Johnson
& Johnson ("Johnson & Johnson"), a license relating to Epoetin alfa for sales in
the United States for all human uses except dialysis and diagnostics. Pursuant
to this license, Amgen does not recognize product sales it makes into the
exclusive market of Johnson & Johnson and does recognize the product sales made
by Johnson & Johnson into Amgen's exclusive market. Sales in Amgen's exclusive
market and adjustments thereto are derived from Company shipments and from 
third-party data on shipments to end users and their usage (see Note 4,
"Contingencies - Johnson & Johnson arbitrations").

  Foreign currency transactions

     The Company has a program to manage foreign currency risk.  As part of this
program, it has purchased foreign currency option and forward contracts to hedge
against possible reductions in values of certain anticipated foreign currency
cash flows generally over the next 12 months, primarily resulting from its sales
in Europe.  At June 30, 1998, the Company had option and forward contracts to
exchange foreign currencies for U.S. dollars of $39.9 million and $25.3 million,
respectively, all having maturities of seven months or less.  The option
contracts, which have only nominal intrinsic value at the time of purchase, are
designated and effective as hedges of anticipated foreign currency transactions
for financial reporting purposes and accordingly, the net gains on such
contracts are deferred and recognized in the same period as the hedged
transactions.  The forward contracts do not qualify as hedges for financial
reporting purposes and accordingly, are marked-to-market.  Net gains on option
contracts (including option contracts for hedged transactions whose occurrence
are no longer probable) and changes in market values of forward contracts are
reflected in "Interest and other income".  The deferred premiums on option
contracts and fair values of forward contracts are included in "Other current
assets".

     The Company has additional foreign currency forward contracts to hedge
exposures to foreign currency fluctuations of certain receivables and payables
denominated in foreign currencies.  At June 30, 1998, the Company had forward
contracts to exchange foreign currencies for U.S. dollars of $27.5 million, all
having maturities of two months or less.  These contracts are designated and
effective as hedges and accordingly, gains and losses on these forward contracts
are recognized in the same period the offsetting gains and losses of hedged
assets and liabilities are realized and recognized.  The fair values of the
forward contracts are included in the corresponding captions of the hedged
assets and liabilities.  Gains and losses on forward contracts, to the extent
they differ in amount from the hedged receivables and payables, are included in
"Interest and other income".

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards ("SFAS") No. 133, "Accounting for Derivative
Instruments and Hedging Activities," which is required to be adopted in fiscal
years beginning after June 15, 1999.  Because of the Company's minimal use of
derivatives, management does not anticipate that the adoption of this new

                                       9
<PAGE>
 
statement will have a significant effect on earnings or the financial position
of the Company.

  Income taxes

     Income taxes are accounted for in accordance SFAS No. 109 (see Note 3,
"Income taxes").

  Stock option and purchase plans

     The Company's stock option and purchase plans are accounted for under
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees".

  Earnings per share

     Basic earnings per share is based upon the weighted-average number of
common shares outstanding.  Diluted earnings per share is based upon the
weighted-average number of common shares and dilutive potential common shares
outstanding.  Potential common shares are outstanding options under the
Company's stock option plans which are included under the treasury stock method.

     The following table sets forth the computation for basic and diluted
earnings per share (in millions, except per share information):

<TABLE>
<CAPTION>
                                                              Three Months                 Six Months
                                                             Ended June 30,              Ended June 30,
                                                           1998          1997          1998          1997
                                                          ------        ------        ------        ------
<S>                                                       <C>           <C>           <C>           <C>
Numerator for basic and diluted 
  earnings per share -  net income....................    $216.3        $200.5        $403.6        $380.8
                                                          ======        ======        ======        ======
Denominator:
Denominator for basic earnings 
  per share -  weighted-average
  shares..............................................     253.9         265.3         255.1         265.3
                                                           
Effect of dilutive securities - 
  employee stock options..............................       8.6          12.2           8.1          12.5
                                                          ------        ------        ------        ------
Denominator for diluted earnings 
  per share -  adjusted weighted-
  average shares......................................     262.5         277.5         263.2         277.8
                                                          ======        ======        ======        ======
Basic earnings per share.............................     $ 0.85        $ 0.76        $ 1.58        $ 1.44
                                                          ======        ======        ======        ======
Diluted earnings per share...........................     $ 0.82        $ 0.72        $ 1.53        $ 1.37
                                                          ======        ======        ======        ======
</TABLE>

  Use of estimates

     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the

                                       10
<PAGE>
 
financial statements and accompanying notes. Actual results may differ from
those estimates.

  Basis of presentation

     The financial information for the three and six months ended June 30, 1998
and 1997 is unaudited but includes all adjustments (consisting only of normal
recurring accruals) which the Company considers necessary for a fair
presentation of the results of operations for these periods.  Interim results
are not necessarily indicative of results for the full fiscal year.

  Reclassification

     Certain prior year amounts have been reclassified to conform to the current
year presentation.


2.   Debt

     As of June 30, 1998, the Company had $234 million of unsecured debt
securities outstanding, of which $11 million matures within one year.  The
Company has established a $500 million debt shelf registration statement under
which the Company has issued $100 million of debt securities (the "Notes") and
established a $400 million medium term note program.  The Company may offer and
issue medium term notes from time to time with terms to be determined by market
conditions.  The Notes bear interest at a fixed rate of 6.5% and mature in 10
years.  The Company's other outstanding debt includes $100 million of debt
securities that bear interest at a fixed rate of 8.1% and mature in 2097 and $34
million of notes that bear interest at fixed rates averaging 6% and have
remaining maturities of less than six years.

     The Company had a commercial paper program which provided for unsecured
short-term borrowings up to an aggregate of $200 million.  In April 1998, the
Company replaced this program with a new commercial paper program which provides
for the same amount of aggregate short-term borrowings.  As of June 30, 1998,
commercial paper with a face amount of $100 million was outstanding.  These
borrowings had maturities of less than four months and had effective interest
rates averaging 5.6%.

     In May 1998, the Company replaced its credit facility with a new unsecured
$150 million credit facility that has substantially the same terms as the
Company's prior credit facility and expires on May 28, 2003.  As of June 30,
1998, $150 million was available under the Company's line of credit for
borrowing.

                                       11
<PAGE>
 
3.   Income taxes

     The provision for income taxes consists of the following (in millions):

<TABLE>
<CAPTION>
                                                Three Months Ended                       Six Months Ended
                                                     June 30,                                June 30,
                                              1998              1997                   1998            1997
                                             ------            ------                 ------          ------
<S>                                           <C>               <C>                   <C>             <C>
Federal(including U.S.
 possessions).........................        $86.6             $72.3                 $161.5          $137.4
State.................................          6.1               5.5                   11.5            10.5
                                              -----             -----                 ------          ------
                                              $92.7             $77.8                 $173.0          $147.9
                                              =====             =====                 ======          ======
</TABLE>

     The increase in the effective tax rate in the current year is the result of
a provision in the federal tax law which caps tax benefits associated with the
Company's Puerto Rico operations at the 1995 income level.


4.   Contingencies

  Johnson & Johnson arbitrations

     Epoetin alfa

     In September 1985, the Company granted Johnson & Johnson's affiliate, Ortho
Pharmaceutical Corporation, a license relating to certain patented technology
and know-how of the Company to sell a genetically engineered form of recombinant
human erythropoietin, called Epoetin alfa, throughout the United States for all
human uses except dialysis and diagnostics.  Johnson & Johnson sells Epoetin
alfa under the brand name PROCRIT(R).  A number of disputes have arisen between
Amgen and Johnson & Johnson as to their respective rights and obligations under
the various agreements between them, including the agreement granting the
license (the "License Agreement").

     A dispute between Amgen and Johnson & Johnson that is the subject of a
current arbitration proceeding relates to the audit methodology currently
employed by the Company for Epoetin alfa sales.  The Company and Johnson &
Johnson are required to compensate each other for Epoetin alfa sales which
either party makes into the other party's exclusive market, sometimes referred
to as "spillover".  Spillover occurs when, for example, a hospital or other
purchaser buys one brand for use in both dialysis and non-dialysis indications.
The Company has established and is employing an audit methodology to assign the
proceeds of sales of EPOGEN(R) and PROCRIT in the Company's and Johnson &
Johnson's respective exclusive markets.  On September 12, 1997, the arbitrator
in this matter (the "Arbitrator") issued an opinion adopting the Company's audit
methodology.  For the free standing dialysis center segment of the Epoetin alfa
market, which accounts for about two-thirds of the Company's EPOGEN sales, the
Arbitrator ruled that the Company's audit accurately determined 

                                       12
<PAGE>
 
period. As a result of that hearing, the Company will pay an additional amount
to Johnson & Johnson for the 1991-94 period which is covered by amounts
previously provided for by the Company. On April 14, 1998, the Arbitrator issued
his final order which confirmed that the Company was the successful party in the
arbitration and, as a result, Johnson & Johnson has been ordered to pay to the
Company all costs and expenses, including reasonable attorney's fees, that the
Company incurred in the arbitration as well as one-half of the audit costs. The
Company currently estimates that it will submit a bill for such costs incurred
over an eight year period of approximately $100 million; however, the actual
amount of the Company's recovery will be determined by the Arbitrator. The final
order also confirmed that for the period 1995 forward, the estimates of usage of
Epoetin alfa in the Hospital segment of the Company's audit methodology shall be
applied without adjustment, subject to the right of either party to challenge
the Hospital survey results for 1995 and certain subsequent years.

     Both parties filed and presented arguments on motions seeking
reconsideration of certain aspects of the Arbitrator's final order. On July 29,
1998, the Arbitrator issued his opinion on both parties' motions for
reconsideration.  The Arbitrator granted the Company's motion to reconsider one
aspect of the adjustment to the results of the audit for the Hospital and Home
Health Care Segment.  The Arbitrator's ruling changes the calculation for that
segment and reduces the Company's liability to Johnson & Johnson for the 1991-94
period.  The Arbitrator denied all other motions, including Johnson & Johnson's
motion seeking a reconsideration of the award to the Company of all costs and
expenses, including reasonable attorneys' fees and costs, that the Company
incurred in the arbitration.  Due to remaining uncertainties the Company has not
recognized any benefit from the reduced liability for 1991-94 or for the
recovery of attorneys' fees and costs or audit costs.  On August 12, 1998,
Johnson & Johnson gave notice of challenge to the results of the audit of the
Hospital segment for the 1995-97 period.  If, as a result of this challenge,
adjustments to the results of the Company's audit are made, the Company may be
required to pay additional compensation to Johnson & Johnson for sales during
1995, 1996 and 1997.  The Company does not expect that any such additional
compensation for the 1995-97 period would have a material adverse effect on the
annual financial statements of Amgen due to amounts previously provided for by
the Company.

     The Company has filed a demand in the arbitration to terminate Johnson &
Johnson's rights under the License Agreement and to recover damages for breach
of the License Agreement.  Johnson & Johnson disputes the Arbitrator's
jurisdiction to decide the Company's 
<PAGE>
 
audit yield results that are different from the results of the audit currently
employed by the Company, the Company may be required to pay additional
compensation to Johnson & Johnson for sales during 1995, 1996 and 1997, or
Johnson & Johnson may be required to pay compensation to the Company for such
prior period sales.

     The Company has filed a demand in the arbitration to terminate Johnson &
Johnson's rights under the License Agreement and to recover damages for breach
of the License Agreement.  Johnson & Johnson disputes the Arbitrator's
jurisdiction to decide the Company's demand.  The Company has requested a
hearing before the Arbitrator on the Company's termination demand.  No trial
date on this matter has been set.

     On October 2, 1995, Johnson & Johnson filed a demand for a separate
arbitration proceeding against the Company before the American Arbitration
Association ("AAA") in Chicago, Illinois.  Johnson & Johnson alleges in this
demand that the Company has breached the License Agreement.  The demand also
includes allegations of various antitrust violations.  In this demand, Johnson &
Johnson seeks an injunction, declaratory relief, unspecified compensatory
damages, punitive damages and costs.  On October 27, 1995, the Company filed a
complaint in the Circuit Court of Cook County, Illinois seeking an order
compelling Johnson & Johnson to arbitrate the Company's claim for termination
before the Arbitrator as well as all related counterclaims asserted in Johnson &
Johnson's October 2, 1995 AAA arbitration demand.  The Company is unable to
predict at this time the outcome of the demand for termination or when it will
be resolved.  The Company has filed a motion to stay the AAA arbitration pending
the outcome of the existing arbitration proceedings before the Arbitrator
discussed above.  The Company has also filed an answer and counterclaim denying
that AAA has jurisdiction to hear or decide the claims stated in the demand,
denying the allegations in the demand and counter claiming for certain unpaid
invoices.

     NESP

     On June 5, 1997, Johnson & Johnson filed a demand for arbitration against
Kirin-Amgen, Inc. ("Kirin-Amgen"), an affiliate of the Company, before the AAA.
The demand alleges that Amgen's novel erythropoiesis stimulating protein
("NESP") is covered by a license granted by Kirin-Amgen to Johnson & Johnson in
1985 for the development, manufacture and sale of Epoetin alfa in certain
territories outside the United States, Japan and China (the "K-A License").  In
1996 Kirin-Amgen acquired exclusive worldwide rights in NESP from Amgen.  Kirin-
Amgen, in turn, transferred certain rights in NESP to Kirin and certain rights
to Amgen. Johnson & Johnson alleges that the K-A License effectively grants
Johnson & Johnson the same right to develop, manufacture and sell NESP as
granted under the K-A License with respect to Epoetin alfa.  Kirin-Amgen filed
its answer to Johnson & Johnson's complaint on January 12, 1998, denying that
Johnson & Johnson has rights to NESP.  Kirin-Amgen also asserted a counterclaim
for the recovery of certain royalty payments which Kirin-Amgen asserts were
improperly withheld.  These same disputes 

                                       14
<PAGE>
 
exist between the Company and Johnson & Johnson under the License Agreement and
the parties have agreed that the resolution of these issues in this arbitration
will be binding upon them with respect to the License Agreement. The trial in
this matter has commenced.

     While it is not possible to predict accurately or determine the eventual
outcome of the above described legal matters or various other legal proceedings
(including patent disputes) involving Amgen, the Company believes that the
outcome of these proceedings will not have a material adverse effect on its
annual financial statements.


5.   Stockholders' equity

     During the six months ended June 30, 1998, the Company repurchased 8.2
million shares of its common stock at a total cost of $457 million under its
common stock repurchase program.  In October 1997, the Board of Directors
authorized the Company to repurchase up to an additional $1 billion of common
stock through December 31, 1998.  At June 30, 1998, $255 million of this
authorization remained.  Stock repurchased under the program is retired.


6.   Comprehensive income

     As of January 1, 1998, the Company adopted Statement of Financial
Accounting Standards ("SFAS") No. 130, "Reporting Comprehensive Income".  SFAS
No. 130 establishes new rules for the reporting and display of comprehensive
income and its components.  SFAS No. 130 requires unrealized gains and losses on
the Company's available-for-sale securities and foreign currency translation
adjustments to be included in other comprehensive income.  During the three and
six months ended June 30, 1998, total comprehensive income was $208.1 million
and $392.4 million, respectively.  During the three and six months ended June
30, 1997, total comprehensive income was $197.6 million and $376 million,
respectively.


Item 2.   Management's Discussion and Analysis of Financial Condition and
          Results of Operations

Liquidity and Capital Resources

     Cash provided by operating activities has been and is expected to continue
to be the Company's primary source of funds.  During the six months ended June
30, 1998, operations provided $515 million of cash compared with $469.9 million
during the same period last year. The Company had cash, cash equivalents and
marketable securities of $1,021.3 million at June 30, 1998, compared with
$1,026.5 million at December 31, 1997.

     Capital expenditures totaled $236 million for the six months ended June 30,
1998, compared with $195 million for the same period a year ago.  The Company
anticipates spending approximately $400 million to $500 million in 1998 on
capital projects and equipment to expand the Company's global operations.
Thereafter, over the next 

                                       15
<PAGE>
 
few years, the Company anticipates that capital expenditures will average in
excess of $400 million per year.

     The Company receives cash from the exercise of employee stock options.
During the six months ended June 30, 1998, stock options and their related tax
benefits provided $121.8 million of cash compared with $87.6 million for the
same period last year.  Proceeds from the exercise of stock options and their
related tax benefits will vary from period to period based upon, among other
factors,  fluctuations in the market value of the Company's stock relative to
the exercise price of such options.

     The Company has a stock repurchase program primarily to offset the dilutive
effect of its employee stock option and stock purchase plans.  During the six
months ended June 30, 1998, the Company repurchased 8.2 million shares of its
common stock at a total cost of $457 million compared with 3.5 million shares
purchased at a cost of $210.9 million during the same period last year.  In
October 1997, the Board of Directors authorized the Company to repurchase up to
an additional $1 billion of common stock through December 31, 1998.  At June 30,
1998, $255 million of this authorization remained.

     To provide for financial flexibility and increased liquidity, the Company
has established several sources of debt financing.  The Company established a
$500 million debt shelf registration statement and in December 1997, pursuant to
such registration statement, the Company issued $100 million of debt securities
that bear interest at a fixed rate of 6.5% and mature in 10 years (the "Notes").
As of June 30, 1998, the Company had $234 million of unsecured debt securities
outstanding.  This amount includes the Notes, $34 million of debt securities
that bear interest at fixed rates averaging 6% and have remaining maturities of
less than six years and $100 million of debt securities that bear interest at a
fixed rate of 8.1% and mature in 2097.  The Company repaid $25 million of
maturing debt securities during the six month ended June 30, 1998.

     The Company's sources of debt financing also include a commercial paper
program which provides for short-term borrowings up to an aggregate face amount
of $200 million.  In April 1998, the Company replaced this program with a new
commercial paper program which provides for the same amount of aggregate short-
term borrowings.  As of June 30, 1998, commercial paper with a face amount of
$100 million was outstanding.  These borrowings had maturities of less than four
months and had effective interest rates averaging 5.6%.  In May 1998, the
Company replaced its credit facility with a new $150 million unsecured credit
facility that has substantially the same terms as the Company's prior credit
facility and expires on May 28, 2003.  The new credit facility supports the
Company's commercial paper program.  As of June 30, 1998, no amounts were
outstanding under the line of credit.

     The primary objectives for the Company's investment portfolio are liquidity
and safety of principal.  Investments are made to achieve the highest rate of
return to the Company, consistent with these two objectives.  The Company's
investment policy limits investments to certain types of instruments issued by
institutions 

                                       16
<PAGE>
 
with investment grade credit ratings and places restrictions on maturities and
concentration by type and issuer. The Company invests its excess cash in
securities with varying maturities to meet projected cash needs.

     The Company believes that existing funds, cash generated from operations
and existing sources of debt financing are adequate to satisfy its working
capital and capital expenditure requirements for the foreseeable future, as well
as to support its stock repurchase program.  However, the Company may raise
additional capital from time to time.


Results of Operations

  Product sales

     Product sales were $611.2 million and $1,178 million for the three and six
months ended June 30, 1998, respectively.  These amounts represent increases of
$44.5 million and $75.3 million, or 8% and 7%, respectively, over the same
periods last year.

     EPOGEN(R) (Epoetin alfa)

     EPOGEN(R) sales were $336.5 million and $640.9 million for the three and
six months ended June 30, 1998, respectively.  These amounts represent increases
of $41.6 million and $54.4 million or 14% and 9%, respectively, over the same
periods last year. These increases were primarily due to growth in the U.S.
dialysis patient population and the administration of higher doses.  The
administration of higher doses of EPOGEN(R) was principally due to certain
dialysis providers using better anemia management practices, including using
hemoglobin measurements instead of hematocrit measurements, as well as changes
in reimbursement announced in March and June 1998 by the Health Care Financing
Administration ("HCFA"), discussed below.

     In September 1997, HCFA implemented changes (the "HCFA Policy Changes") to
its reimbursement policy.  Prior to the HCFA Policy Changes, fiscal
intermediaries under contract with HCFA were authorized to pay reimbursement
claims for patients whose hematocrits exceeded 36 percent, the top of the
suggested target hematocrit range in the Company's labeling, if deemed medically
justified.  Under the HCFA Policy Changes, medical justification was not
accepted for payment of claims of hematocrits that exceeded 36 percent and, if
the current month's hematocrit were greater than 36 percent and the patient's
hematocrit exceeded 36.5 percent on an historical 90-day "rolling average"
basis, reimbursement for the current month would be denied in full.  Beginning
in the second quarter of 1997, the Company experienced a decline in the growth
rate of EPOGEN(R) sales as dialysis providers attempted to lower hematocrits by
lowering or withholding EPOGEN(R) doses in order to avoid or minimize claim
denials under the HCFA Policy Changes.  However, in March 1998, HCFA announced
the easing of restrictions on reimbursement that had been instituted under the
HCFA Policy Changes.  In June 1998, HCFA announced further revisions.

                                       17
<PAGE>
 
     In March 1998, HCFA issued two revisions (the "March HCFA Revisions") to
the HCFA Policy Changes in a program memorandum.  The first revision provided
that, for a month in which the three month "rolling average" hematocrit exceeds
36.5 percent, HCFA would pay the lower of 100 percent of the actual dosage
billed for that month, or 80 percent of the prior month's allowable EPOGEN(R)
dosage.  The second revision re-established authorization to make payment for
EPOGEN(R) when a patient's hematocrit exceeded 36 percent when accompanied by
documentation establishing medical necessity.  In June 1998, HCFA issued another
program memorandum establishing additional revisions (the "June HCFA Revisions")
to the reimbursement policy.  The policy now states that pre-payment review of
claims has been eliminated and fiscal intermediaries should conduct post-payment
reviews of those dialysis providers with an atypical number of patients with
hematocrit levels above a 90-day "rolling average" of 37.5 percent.
Additionally, HCFA stated that it is encouraging dialysis providers to maintain
a hematocrit level within the range of 33 to 36 percent as recommended by the
Dialysis Outcomes Quality Initiative.  HCFA also stated that it plans to develop
a national policy for medical justification for physicians who target their
patients' hematocrits greater than 36 percent.  In the interim, individual
patient treatment will continue to be subject to the physician's discretion and
documentation must satisfy the judgment of the fiscal intermediary.  The June
HCFA Revisions supersede the HCFA Policy Changes and the March HCFA Revisions.
The Company believes that dialysis providers are currently in the process of
understanding the June HCFA Revisions, revising their protocols and discerning
how fiscal intermediaries will implement these revisions.  The Company believes
that fiscal intermediaries are likely to implement the June HCFA Revisions at
variable rates which may have an impact on dialysis providers' practice pattern
changes and the rate of change.  Accordingly, it is difficult to predict what
effect the June HCFA Revisions will have on EPOGEN(R) sales.

     NEUPOGEN(R) (Filgrastim)

     Worldwide NEUPOGEN(R) sales were $270.6 million and $531.8 million for the
three and six months ended June 30, 1998.  These amounts represent a decrease of
$1.2 million or 0.4% and an increase of $15.6 million or 3%, respectively, over
the same periods last year.  Results for the second quarter of 1998 include low
single digit underlying growth in demand due to sustained growth in the U.S.
cancer chemotherapy market, which was more than offset by a decline in off-label
sales for use in the AIDS setting, a slight decline in use in the cancer
chemotherapy setting in the European Union ("EU"), unfavorable foreign currency
effects, and a draw-down of wholesaler inventories.  The increase during the six
months ended June 30, 1998 is primarily due to an increase in demand in the U.S.
market, which includes a price increase and an increase in wholesaler
inventories.  This increase was largely offset by the unfavorable foreign
currency effects on reported EU sales.  In addition, the Company believes that
the use of protease inhibitors as a treatment for AIDS continues to reduce sales
of NEUPOGEN(R) for off-label use as a supportive therapy in this setting.
NEUPOGEN(R) is not approved or promoted for such use, except in Australia and
Canada.

                                       18
<PAGE>
 
     Cost containment pressures in the U.S. health care marketplace have
contributed to the slowing of growth in domestic NEUPOGEN(R) usage over the past
several quarters.  These pressures are expected to continue to influence growth
for the foreseeable future.  In addition, quarterly NEUPOGEN(R) sales volume is
influenced by a number of factors including underlying demand and wholesaler
inventory management practices.

     The growth of the colony stimulating factor ("CSF") market in the EU in
which NEUPOGEN(R) competes has slowed, principally due to EU government
pressures on physician prescribing practices in response to ongoing government
initiatives to reduce health care expenditures.  Experimental cancer trials in
Italy that do not include the use of NEUPOGEN(R) have also adversely affected EU
sales.  Additionally, the Company faces competition from another granulocyte CSF
product.  Amgen's CSF market share in the EU has remained relatively constant
over the last several quarters, however, the Company does not expect the
competitive intensity to subside in the near future.

     Other product sales

     INFERGEN(R) (Interferon alfacon-1) sales were $4.1 million and $5.3 million
for the three and six months ended June 30, 1998.  INFERGEN(R) was launched in
October 1997 for the treatment of chronic hepatitis C virus infection.  There
are treatments for this infection against which INFERGEN(R) competes, and the
Company cannot predict the extent to which it will penetrate this market.

  Corporate partner revenues

     During the three and six months ended June 30, 1998, corporate partner
revenues decreased by $10.1 million and $14.9 million, or 25% and 22%,
respectively, compared with the same periods last year.  These decreases
primarily resulted from a $20 million milestone payment from Yamanouchi
Pharmaceutical Co., Ltd. during the second quarter of 1997.

  Cost of sales

     Cost of sales as a percentage of product sales was 13.7% and 13.8% for the
three and six months ended June 30, 1998, respectively, compared with 13.6% and
13.5% for the same periods last year.

  Research and development

     During the three and six months ended June 30, 1998, research and
development expenses increased $7 million and $11.8 million, or 5% and 4%,
respectively, compared with the same periods last year. The increase during the
second quarter of 1998 is primarily due to higher clinical and preclinical
expenses and occupancy related costs, partially offset by lower product
licensing costs.  The increase during the six months ended June 30, 1998 is
primarily due to higher clinical and preclinical expenses and staff and
occupancy related costs, partially offset by lower product licensing costs.

                                       19
<PAGE>
 
  Marketing and selling/General and administrative

     Marketing and selling expenses decreased $7.5 million and $8.8 million, or
9% and 6%, respectively, during the three and six months ended June 30, 1998
compared with the same periods last year.  These decreases were primarily due to
lower expenses related to the Johnson & Johnson arbitration and to lower
domestic and European marketing expenses.

     General and administrative expenses increased $4 million and $5.9 million,
or 9% and 7%, respectively, during the three and six months ended June 30, 1998
compared with the same periods last year.  These increases were primarily due to
higher staff-related expenses and legal fees.

  Interest and other income

     During the three and six months ended June 30, 1998, interest and other
income increased $5.9 million and $5.2 million, or 33% and 15%, respectively,
compared with the same periods last year.  These increases are primarily due to
a gain realized on the sale of an equity position in Techne Corporation, an
unaffiliated company.

  Income taxes

     The Company's effective tax rate for the three and six months ended June
30, 1998 was 30.0% compared with 28.0% for the same periods last year.  The
increase in the effective tax rate in the current year is due to a provision in
the federal tax law which caps tax benefits associated with the Company's Puerto
Rico operations at the 1995 income level.

  Foreign currency transactions

     The Company has a program to manage certain portions of its exposure to
fluctuations in foreign currency exchange rates arising from international
operations.  The Company generally hedges the receivables and payables with
foreign currency forward contracts, which typically mature within three months.
The Company uses foreign currency option and forward contracts which generally
expire within 12 months to hedge certain anticipated future sales and expenses.
At June 30, 1998, outstanding foreign currency option and forward contracts
totaled $39.9 million and $52.8 million, respectively.

  Year 2000

     The Year 2000 issue results from computer programs that do not
differentiate between the year 1900 and the year 2000 because they were written
using two digits rather than four to define the applicable year; accordingly,
computer systems that have time-sensitive calculations may not properly
recognize the year 2000.  The Company has conducted an initial review of its
computer systems, devices, applications and manufacturing equipment
(collectively, "Computer Systems") to identify those areas that could be
affected by Year 2000 noncompliance.  Additionally, the Company has appointed 

                                       20
<PAGE>
 
a program manager for Year 2000 compliance and is presently assessing in detail
the affected Computer Systems and is developing plans to address the required
modifications.  The Company is using internal and external resources to
identify, correct or reprogram and test its Computer Systems for Year 2000
compliance.  The total cost associated with Year 2000 compliance is not known at
this time.  The Company has not communicated with many of its suppliers, service
providers, distributors, wholesalers and other entities with which it has a
business relationship (collectively, "Third Party Businesses") regarding
compliance with Year 2000 requirements, although the Company does intend to
communicate with key Third Party Businesses.  The Company is in the process of
identifying key Third Party Businesses.  In addition, the Company has not
determined the impact, if any, on its operations if key Third Party Businesses
fail to comply with Year 2000 requirements.  While the Company plans to complete
modifications of its business critical Computer Systems prior to the year 2000,
if modifications of such business critical Computer Systems, or Computer Systems
of key Third Party Businesses are not completed in a timely manner, the Year
2000 issue could have a material adverse effect on the operations and financial
position of the Company.  The Company may also be affected by the failure of
state, federal and private payors or reimbursers to be Year 2000 compliant if
such entities are unable to make timely, proper or complete payments to sellers
of the Company's products.  The Company cannot predict the extent of any such
impact.


Financial Outlook

     The Company expects a low single digit sales growth rate for NEUPOGEN(R) in
1998.  Future NEUPOGEN(R) (Filgrastim) sales growth is dependent primarily upon
further penetration of existing markets, the timing and nature of additional
indications for which the product may be approved and the effects of competitive
products.  Although not approved or promoted for use in Amgen's domestic or
foreign markets, except for Australia and Canada, the Company believes that
currently approximately 5% of its worldwide NEUPOGEN(R) sales are from off-label
use as a supportive therapy to various AIDS treatments.  Changes in AIDS
therapies, including protease inhibitors that may be less myelosuppressive, are
believed to have adversely affected and are expected to continue to adversely
affect such sales.  NEUPOGEN(R) usage is expected to continue to be affected by
cost containment pressures on health care providers worldwide.  As a result of
the factors discussed in "Results of Operations - Product sales - NEUPOGEN(R)"
the Company believes that growth in the CSF market in the EU is likely to be
flat year over year.  In addition, reported NEUPOGEN(R) sales will continue to
be affected by changes in foreign currency exchange rates and government
budgets.

     The Company expects a low double digit sales growth rate for EPOGEN(R) in
1998.  Although the Company believes that dialysis providers have increased
doses primarily in response to the March HCFA Revisions and due to certain
dialysis providers using hemoglobin measurements instead of hematocrit
measurements (see, "Results of Operations - Product sales - EPOGEN(R) (Epoetin
alfa)"), 

                                       21
<PAGE>
 
the timing and magnitude of EPOGEN(R) sales growth due to increases in dose is
difficult to predict principally due to the timing and variety of dialysis
providers' and fiscal intermediaries' reaction to the March HCFA Revisions and
the June HCFA Revisions. The Company believes that increases in the U.S.
dialysis patient population and dose will continue to grow EPOGEN(R) sales in
the near term. Patients receiving treatment for end stage renal disease are
covered primarily under medical programs provided by the federal government.
Therefore, EPOGEN(R) sales may also be affected by future changes in
reimbursement rates or a change in the basis for reimbursement by the federal
government. The previously disclosed report of the Office of the Inspector
General has been issued, recommending a 10% reduction in the Medicare
reimbursement rate for EPOGEN(R). The Company believes the recommendation would
primarily affect dialysis providers and that it is difficult to predict the
impact on Amgen.

     INFERGEN(R) (Interferon alfacon-1) was launched in October 1997 for the
treatment of chronic hepatitis C virus infection.  There are treatments for this
infection against which INFERGEN(R) competes, and the Company cannot predict the
extent to which it will penetrate this market.  The Company is presently engaged
in certain litigation related to INFERGEN(R), as described in "Part I, Item 3.
Legal Proceedings - INFERGEN(R) litigation" in the Company's Annual Report on
Form 10-K for the year ended December 31, 1997.

     The Company anticipates total product sales growth in 1998 that is at, or
close to, a double digit growth rate.  Cost of sales as a percentage of product
sales for 1998 is expected to be slightly higher than 1997.  Research and
development expenses in the second half of 1998 are expected to increase due in
part to heavier spending on clinical trials and potential new licensing
activities; for 1998, research and development expenses are expected to be
approximately $650 million.  In 1998, marketing and selling expenses combined
with general and administrative expenses are expected to have little growth.
Without giving effect to the 1997 legal assessment, earnings per share in 1998
is expected to grow at a low double digit rate.  Estimates of future product
sales, operating expenses, and earnings per share are necessarily speculative in
nature and are difficult to predict with accuracy.

     Except for the historical information contained herein, the matters
discussed herein are by their nature forward-looking.  Investors are cautioned
that forward-looking statements or projections made by the Company, including
those made in this document, are subject to risks and uncertainties that may
cause actual results to differ materially from those projected.  Reference is
made in particular to forward-looking statements regarding product sales,
earnings per share and expenses.  Amgen operates in a rapidly changing
environment that involves a number of risks, some of which are beyond the
Company's control.  Future operating results and the Company's stock price may
be affected by a number of factors, including, without limitation: (i) the
results of preclinical and clinical trials; (ii) regulatory approvals of product
candidates, new indications and manufacturing facilities; (iii) reimbursement
for Amgen's products by governments and private 

                                       22
<PAGE>
 
payors; (iv) health care guidelines relating to Amgen's products; (v)
intellectual property matters (patents) and the results of litigation; (vi)
competition; (vii) fluctuations in operating results and (viii) rapid growth of
the Company. These factors and others are discussed herein and in the sections
appearing in "Item 1. Business - Factors That May Affect the Company" in the
Company's Annual Report on Form 10-K for the year ended December 31, 1997, which
sections are incorporated herein by reference and filed as exhibit 99 hereto.


Legal Matters

     The Company is engaged in arbitration proceedings with one of its licensees
and various other legal proceedings.  For a discussion of these matters, see
Note 4 to the Consolidated Financial Statements.


                          PART II - OTHER INFORMATION


Item 1.   LEGAL PROCEEDINGS

     The Company is engaged in arbitration proceedings with one of its
licensees. For a complete discussion of these matters see Note 4 to the
Condensed Consolidated Financial Statements, "Contingencies". Other legal
proceedings are also reported in the Company's Form 10-K for the year ended
December 31, 1997, with material developments since that report described in
the Company's Form 10-Q for the quarter ended March 31, 1998, and below. While
it is not possible to predict accurately or to determine the eventual outcome of
these matters, the Company believes that the outcome of these proceedings will
not have a material adverse effect on the annual financial statements of the
Company, except with respect to the Securities Litigation, which the Company has
not evaluated.

Securities Litigation

     On August 7, 1998, August 10, 1998 and August 13, 1998, press releases were
issued announcing that securities class action lawsuits had been filed against
Amgen and certain of its officers. According to the press releases, the
complaints allege that Amgen and several of its senior executives issued false
and misleading statements between January 23, 1997 and August 11, 1997 (the
"Class Period") regarding: (i) the demand for and sales growth of Amgen's two
products, EPOGEN(R) and NEUPOGEN(R); (ii) an arbitration proceeding between
Amgen and Johnson & Johnson regarding entitlement to millions of dollars in
"spillover" sales of EPOGEN(R); and (iii) Amgen's 1996 fourth quarter and 1997
first and second quarter results. The press releases further state that
plaintiffs seek to recover damages on behalf of all purchasers of Amgen common
stock during the Class Period.

     On August 13, 1998, the Company was served in this matter and has not 
reviewed the complaints.

Biogen litigation

     On March 10, 1995, Biogen Inc. ("Biogen"), filed suit in the United States
District Court for the District of Massachusetts alleging infringement by the
Company of certain claims of U.S. Patent 4,874,702 (the "'702 Patent"), relating
to vectors for expressing cloned genes. Biogen alleges that Amgen has infringed
its patent by manufacturing and selling NEUPOGEN(R). On March 28, 1995, Biogen
filed an amended complaint further alleging that the Company is also infringing
the claims of two additional patents allegedly assigned to Biogen, U.S. Patent
5,401,642 (the "'642 Patent") and U.S. Patent No. 5,401,658 (the "'658 Patent"),
relating to vectors, methods for making vectors and expressing cloned genes. The
amended complaint seeks injunctive relief, unspecified compensatory damages and
treble damages. On April 24, 1995, the Company answered Biogen's amended
complaint, denying its material allegations and pleading counterclaims for
declaratory judgment of non-infringement, patent invalidity and
unenforceability. On January 19, 1996, the Court decided, upon Biogen's motion
to dismiss certain of Amgen's counterclaims, that it will exert jurisdiction
over claims 9 and 17 of the '702 Patent, and dismissed all claims and
counterclaims relating to any other claims of the '702 Patent. On October 22,
1997, Amgen moved for summary judgment of invalidity of the certain claims of
the '702 and '658 Patents based on prior public uses of the claimed subject
matter. Amgen concurrently moved for a partial interpretation of the claims at
issue. In addition, on October 24, 1997, Amgen filed a motion for summary
judgment of invalidity of particular claims of the patents-in-suit based on
abandonment of the invention. Amgen also concurrently filed a motion to dismiss
the lawsuit in its entirety based on Biogen's lack of standing to bring the
lawsuit in view of Biogen's lack of ownership of the patents-in-suit. Both
parties have submitted claim construction briefs with the court. On January 15,
1998, Amgen filed a second motion to dismiss for lack of subject matter
jurisdiction and standing in view of Biogen's lack of necessary ownership rights
in the patents-in-suit. In an August 6, 1998 ruling on a previously-held claim
construction hearing, the court issued an order that essentially limits the
Biogen patent claims to a single particular type of vector. The judge ruled
that, to be covered by claim 1 of the '702 patent (the claim that forms the crux
of the asserted claims), a plasmid vector must contain the entire DNA sequence
as represented in a specific Figure (Figure 6) of the '702 patent, as well as at
least one endonuclease recognition site inserted at the converted HaeIII site at
73.1% of bacteriophage lambda or at another site downstream of HaeIII, said
endonuclease recognition site being within 300 base pairs of the HincII site 
at -33, and prior to any sequences of lambda DNA downstream of the HaeIII site.
Discovery in the case is substantially completed. A trial date has not been set.

     In a separate matter, on July 30, 1997, Biogen filed a complaint in the
United States District Court for the District of Massachusetts in Boston
alleging that Amgen infringes claims 9 and 17 of the '702 Patent, and the '642
Patent and '658 Patent by making and using the claimed subject matter in the
United States in the manufacture of INFERGEN(R), the Company's consensus
interferon product. On September 17, 1997, Amgen responded to the Complaint by
filing a motion to dismiss the case in its entirety due to Biogen's lack of
ownership of the patents-in-suit. Amgen also filed a motion for summary judgment
of patent invalidity of particular claims of the patents-in-suit due to
abandonment of the invention. The Court has ordered the Company to file an
answer to Biogen's complaint but has stayed all discovery in this matter until
certain discovery in the NEUPOGEN(R) matter described above is completed. The
Company has filed a motion to dismiss the complaint on the grounds that the
Court lacks jurisdiction over the matter as Biogen lacks the necessary ownership
rights to afford it standing. A trial date has not been set.

FoxMeyer Health Corporation

     On January 10, 1997, FoxMeyer Health Corporation, now known as Avatex
Corporation ("Avatex"), filed suit (the "FoxMeyer Lawsuit") in the District
Court of Dallas County, Dallas, Texas, alleging that defendant McKesson
Corporation ("McKesson") defrauded Avatex, misused confidential information
received from Avatex about subsidiaries of Avatex (FoxMeyer Corporation and
FoxMeyer Drug Corporation, collectively the "FoxMeyer Subsidiaries"), and
attempted to monopolize the market for pharmaceutical and health care product
distribution by attempting to injure or destroy the FoxMeyer Subsidiaries.  The
Company  is named as one of twelve "Manufacturer Defendants" alleged to have
conspired with McKesson Corporation in doing, among other things, the above and
(i) inducing Avatex to refrain from seeking other suitable purchasers for the
FoxMeyer Subsidiaries and (ii) causing Avatex to believe that McKesson was
serious about purchasing Avatex's assets at fair value, when, in fact, McKesson
was not.  The Manufacturer Defendants and McKesson are also alleged to have
intentionally and tortiously interfered with a 

                                       23
<PAGE>
 
number of business expectancies and opportunities. The complaint seeks from the
Manufacturer Defendants and McKesson compensatory damages of at least $400
million and punitive damages in an unspecified amount, as well as Avatex's costs
and attorney's fees. The Company has filed an answer denying Avatex's
allegations. The matter has been transferred to the Federal Bankruptcy Court in
Dallas, Texas (the "Texas Bankruptcy Court"). McKesson and the Manufacturer
Defendants have intervened in an action brought by the Chapter 7 trustee in the
Federal Bankruptcy Court in Delaware (the "Delaware Bankruptcy Court") that
seeks to enjoin the FoxMeyer Lawsuit and have moved for partial summary judgment
in that proceeding, asserting that Avatex is not the owner of the alleged causes
of action. On November 3, 1997, McKesson and the Manufacturer Defendants moved
for summary judgment in the Delaware Bankruptcy Court to preclude Avatex and the
Chapter 7 trustee from litigating in Delaware the claims brought in the Texas
Bankruptcy Court. On June 23, 1998, the interim judge in the Delaware Bankruptcy
Court heard oral argument on the motion of McKesson, the Manufacturer
Defendants, and the Chapter 7 trustee for an order finding that Avatex is not
the holder of any of the claims asserted in its complaint. At that oral
argument, Avatex voluntarily dismissed without prejudice all of the anti-trust
claims contained in the original complaint. The matter is currently under
advisement. To date, no discovery has occurred in either the Texas Bankruptcy
Court adversary proceedings or the Delaware Bankruptcy Court adversary
proceedings.

Johnson & Johnson arbitrations

     The Company is engaged in arbitration proceedings with one of its
licensees.  See Note 4 to the Consolidated Financial Statements, "Contingencies
- - Johnson & Johnson arbitrations".


Item 4.   Submission of Matters to a Vote of Security Holders

     (a)  The Company held its Annual Meeting of Stockholders on May 7, 1998.

     (b)  Omitted pursuant to Instruction 3 to Item 4 of Form 10-Q.

     (c)  The two matters voted upon at the meeting were to elect two directors
          to hold office until the Annual Meeting of Stockholders in the year
          2001 and to ratify the selection of Ernst & Young LLP as the
          independent auditors of the Company for the year ending December 31,
          1998.

          (i)  The following votes were cast for or were withheld with respect
               to each of the nominees for director: Mr. Steven Lazarus:
               210,416,924 votes for and 2,363,696 votes withheld; and Dr.
               Gilbert S. Omenn:  210,481,718 votes for and 2,298,902 votes
               withheld.  All nominees were declared to have been elected as
               directors to hold office until the Annual Meeting of Stockholders
               in the year 2001.  No abstentions or broker non-votes were cast
               for the election of directors.

                                       24
<PAGE>
 
          (ii) With respect to the proposal to ratify the selection of Ernst &
               Young LLP as the Company's independent auditors, 211,523,704
               votes were cast for the proposal, 639,674 votes were cast against
               the proposal and 617,242 votes abstained.  No broker non-votes
               were cast in connection with the proposal.  The selection of
               Ernst & Young LLP as the Company's independent auditors for the
               year ending December 31, 1998 was declared to have been ratified.

     (d)  Not applicable.

Item 5.   Other Information

     The Company's 1999 Annual Meeting of Stockholders (the "Annual Meeting")
will be held on May 6, 1999.

     In June 1998 the Securities and Exchange Commission adopted revisions to
the proxy rules promulgated under the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), in particular, Rules 14a-4, 14a-5 and 14a-8,
relating to stockholder proposals.  Stockholders interested in presenting a
proposal for consideration at the Company's Annual Meeting may do so by
following the procedures prescribed in Rule 14a-8 of the Exchange Act and the
Company's Amended and Restated Bylaws (the "Bylaws").  The Company's Bylaws
provide that stockholders desiring to nominate persons for election to the Board
of Directors or to bring any other business before the stockholders at the
Annual Meeting must notify the Secretary of the Company thereof in writing and
such notice must be delivered to or received by the Secretary no later than 90
days prior to the Annual Meeting, or, no later than February 5, 1999.  The
Bylaws also contain other requirements as to the contents of such notice which
are discussed in the Company's 1998 proxy statement and in the Bylaws, a copy of
which are filed as an exhibit to this Form 10-Q.  Additionally, to be eligible
for inclusion in the Company's 1999 proxy statement, stockholder proposals must
be received by the Company's Secretary no later than December 4, 1998.  While
the Board of Directors will consider stockholder proposals, the Company however
reserves the right to omit from the 1999 proxy statement stockholder proposals
that it is not required to include under the Exchange Act, including Rule 14a-8
thereunder.

                                       25
<PAGE>
 
Item 6.   Exhibits and Reports on Form 8-K

     (a)  Reference is made to the Index to Exhibits included herein.

     (b)  Reports on Form 8-K - none

                                       26
<PAGE>
 
                                    SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                      Amgen Inc.
                                      (Registrant)



Date:   8/12/98                       By:/s/Kathryn E. Falberg
- ----------------                      --------------------------------------
                                        Kathryn E. Falberg
                                        Vice President, Finance,
                                        Chief Financial Officer and
                                        Chief Accounting Officer

                                       27
<PAGE>
 
                                   AMGEN INC.


                               INDEX TO EXHIBITS


Exhibit No.                      Description

   3.1      Restated Certificate of Incorporation as amended. (17)
   3.2*     Amended and Restated Bylaws.
   4.1      Indenture dated January 1, 1992 between the Company and Citibank
            N.A., as trustee. (8)
   4.2      First Supplement to Indenture, dated February 26, 1997 between the
            Company and Citibank N.A., as trustee. (14)
   4.3      Officer's Certificate pursuant to Sections 2.1 and 2.3 of the
            Indenture, as supplemented, establishing a series of securities "8-
            1/8% Debentures due April 1, 2097." (16)
   4.4      8-1/8% Debentures due April 1, 2097. (16)
   4.5      Form of stock certificate for the common stock, par value $.0001 of
            the Company. (17)
   4.6      Officer's Certificate pursuant to Sections 2.1 and 2.3 of the
            Indenture, dated as of January 1, 1992, as supplemented by the First
            supplemental Indenture, dated as of February 26, 1997, each between
            the Company and Citibank, N.A., as Trustee, establishing a series of
            securities entitled "6.50% Notes Due December 1, 2007". (20)
   4.7      6.50% Notes Due December 1, 2007 described in Exhibit 4.7. (20)
   4.8      Corporate Commercial Paper - Master Note between and among Amgen
            Inc., as Issuer, Cede & Co., as nominee of The Depository Trust
            Company and Citibank, N.A. as Paying Agent. (23)
   10.1     Company's Amended and Restated 1991 Equity Incentive Plan. (21)
   10.2     Company's Amended and Restated 1984 Stock Option Plan. (12)
   10.3     Shareholder's Agreement of Kirin-Amgen, Inc., dated May 11, 1984,
            between the Company and Kirin Brewery Company, Limited (with certain
            confidential information deleted therefrom). (1)
   10.4     Amendment Nos. 1, 2, and 3, dated March 19, 1985, July 29, 1985 and
            December 19, 1985, respectively, to the Shareholder's Agreement of
            Kirin-Amgen, Inc., dated May 11, 1984 (with certain confidential
            information deleted therefrom). (3)
   10.5     Product License Agreement, dated September 30, 1985, and Technology
            License Agreement, dated, September 30, 1985 between the Company and
            Ortho Pharmaceutical Corporation (with certain confidential
            information deleted therefrom). (2)
   10.6     Product License Agreement, dated September 30, 1985, and Technology
            License Agreement, dated September 30, 1985 between Kirin-Amgen,
            Inc. and Ortho Pharmaceutical 

                                      28
<PAGE>
 
            Corporation (with certain confidential information deleted
            therefrom). (3)
   10.7     Company's Amended and Restated Employee Stock Purchase Plan. (12)
   10.8     Research, Development Technology Disclosure and License Agreement
            PPO, dated January 20, 1986, by and between the Company and Kirin
            Brewery Co., Ltd. (4)
   10.9     Amendment Nos. 4 and 5, dated October 16, 1986 (effective July 1,
            1986) and December 6, 1986 (effective July 1, 1986), respectively,
            to the Shareholders Agreement of Kirin-Amgen, Inc. dated May 11,
            1984 (with certain confidential information deleted therefrom). (5)
   10.10    Assignment and License Agreement, dated October 16, 1986, between
            the Company and Kirin-Amgen, Inc. (with certain confidential
            information deleted therefrom). (5)
   10.11    G-CSF European License Agreement, dated December 30, 1986, between
            Kirin-Amgen, Inc. and the Company (with certain confidential
            information deleted therefrom). (5)
   10.12    Research and Development Technology Disclosure and License
            Agreement: GM-CSF, dated March 31, 1987, between Kirin Brewery
            Company, Limited and the Company (with certain confidential
            information deleted therefrom). (5)
   10.13    Company's Amended and Restated 1988 Stock Option Plan. (12)
   10.14    Company's Amended and Restated Retirement and Savings Plan. (12)
   10.15    Amendment, dated June 30, 1988, to Research, Development, Technology
            Disclosure and License Agreement: GM-CSF dated March 31, 1987,
            between Kirin Brewery Company, Limited and the Company. (6)
   10.16    Agreement on G-CSF in Certain European Countries, dated January 1,
            1989, between Amgen Inc. and F. Hoffmann-La Roche & Co. Limited
            Company (with certain confidential information deleted therefrom).
            (7)
   10.17    Partnership Purchase Agreement, dated March 12, 1993, between the
            Company, Amgen Clinical Partners, L.P., Amgen Development
            Corporation, the Class A limited partners and the Class B limited
            partner. (9)
   10.18    Amgen Inc. Supplemental Retirement Plan (As Amended and Restated
            Effective January 1, 1998). (23)
   10.19    Promissory Note of Mr. Kevin W. Sharer, dated June 4, 1993. (10)
   10.20    Amgen Performance Based Management Incentive Plan. (15)
   10.21*   Credit Agreement, dated as of May 28, 1998, among Amgen Inc., the
            Borrowing Subsidiaries named therein, the Banks named therein,
            Citibank, N.A., as Issuing Bank, and Citicorp USA, Inc., as
            Administrative Agent.
   10.22    Promissory Note of Mr. George A. Vandeman, dated December 15, 1995.
            (11)
   10.23    Promissory Note of Mr. George A. Vandeman, dated December 15, 1995.
            (11)
   10.24    Promissory Note of Mr. Stan Benson, dated March 19, 1996. (11)
   10.25    Amendment No. 1 to the Company's Amended and Restated Retirement and
            Savings Plan. (12)

                                      29
<PAGE>
 
   10.26    Amendment Number 5 to the Company's Amended and Restated Retirement
            and Savings Plan dated January 1, 1993. (15)
   10.27    Amendment Number 2 to the Company's Amended and Restated Retirement
            and Savings Plan dated April 1, 1996. (15)
   10.28    Fourth Amendment to Rights Agreement, dated February 18, 1997
            between Amgen Inc. and American Stock Transfer and Trust Company,
            Rights Agent. (13)
   10.29    Preferred Share Rights Agreement, dated February 18, 1997, between
            Amgen Inc. and American Stock Transfer and Trust Company, Rights
            Agent. (13)
   10.30    Consulting Agreement, dated November 15, 1996, between the Company
            and Daniel Vapnek. (15)
   10.31    Agreement, dated May 30, 1995, between the Company and George A.
            Vandeman. (15)
   10.32    First Amendment, effective January 1, 1998, to the Company's Amended
            and Restated Employee Stock Purchase Plan. (18)
   10.33    Third Amendment, effective January 1, 1997, to the Company's Amended
            and Restated Retirement and Savings Plan dated April 1, 1996. (18)
   10.34    Heads of Agreement dated April 10, 1997, between the Company and
            Kirin Amgen, Inc., on the one hand, and F. Hoffmann-La Roche Ltd, on
            the other hand (with certain confidential information deleted
            therefrom). (18)
   10.35    Binding Term Sheet, dated August 20, 1997, between Guilford
            Pharmaceuticals Inc. ("Guilford") and GPI NIL Holdings, Inc., and
            Amgen Inc. (with certain confidential information deleted
            therefrom). (19)
   10.36    Promissory Note of Ms. Kathryn E. Falberg, dated April 7, 1995. (21)
   10.37    Promissory Note of Mr. Edward F. Garnett, dated July 18, 1997. (21)
   10.38    Fourth Amendment to the Company's Amended and Restated Retirement
            and Savings Plan as amended and restated effective April 1, 1996.
            (21)
   10.39    Fifth Amendment to the Company's Amended and Restated Retirement and
            Savings Plan as amended and restated effective April 1, 1996. (21)
   10.40    Company's Amended and Restated 1987 Directors' Stock Option Plan.
            (15)
   10.41    Amended and Restated Agreement on G-CSF in the EU between Amgen Inc.
            and F. Hoffmann-La Roche Ltd (with certain confidential information
            deleted therefrom). (23)
   10.42    Collaboration and License Agreement, dated December 15, 1997,
            between the Company, GPI NIL Holdings, Inc. and Guilford
            Pharmaceuticals Inc. ("Guilford") (with certain confidential
            information deleted therefrom). (22)
   27*      Financial Data Schedule.
   99*      Sections appearing under the heading "Business - Factors That May
            the Affect Company" in the Company's Annual Report on Form 10-K for
            the year ended December 31, 1997.
- ----------------
*    Filed herewith.

                                      30
<PAGE>
 
(1)  Filed as an exhibit to the Annual Report on Form 10-K for the year ended
     March 31, 1984 on June 26, 1984 and incorporated herein by reference.
(2)  Filed as an exhibit to Quarterly Report on Form 10-Q for the quarter ended
     September 30, 1985 on November 14, 1985 and incorporated herein by
     reference.
(3)  Filed as an exhibit to Quarterly Report on Form 10-Q for the quarter ended
     December 31, 1985 on February 3, 1986 and incorporated herein by reference.
(4)  Filed as an exhibit to Amendment No. 1 to Form S-1 Registration Statement
     (Registration No. 33-3069) on March 11, 1986 and incorporated herein by
     reference.
(5)  Filed as an exhibit to the Form 10-K Annual Report for the year ended March
     31, 1987 on May 18, 1987 and incorporated herein by reference.
(6)  Filed as an exhibit to Form 8 amending the Quarterly Report on Form 10-Q
     for the quarter ended June 30, 1988 on August 25, 1988 and incorporated
     herein by reference.
(7)  Filed as an exhibit to the Form 8 dated November 8, 1989, amending the
     Annual Report on Form 10-K for the year ended March 31, 1989 on June 28,
     1989 and incorporated herein by reference.
(8)  Filed as an exhibit to Form S-3 Registration Statement dated December 19,
     1991 and incorporated herein by reference.
(9)  Filed as an exhibit to the Form 8-A dated March 31, 1993 and incorporated
     herein by reference.
(10) Filed as an exhibit to the Form 10-Q for the quarter ended September 30,
     1993 on November 12, 1993 and incorporated herein by reference.
(11) Filed as an exhibit to the Annual Report on Form 10-K for the year ended
     December 31, 1995 on March 29, 1996 and incorporated herein by reference.
(12) Filed as an exhibit to the Form 10-Q for the quarter ended September 30,
     1996 on November 5, 1996 and incorporated herein by reference.
(13) Filed as an exhibit to the Form 8-K Current Report dated February 18, 1997
     on February 28, 1997 and incorporated herein by reference.
(14) Filed as an exhibit to the Form 8-K Current Report dated March 14, 1997 on
     March 14, 1997 and incorporated herein by reference.
(15) Filed as an exhibit to the Annual Report on Form 10-K for the year ended
     December 31, 1996 on March 24, 1997 and incorporated herein by reference.
(16) Filed as an exhibit to the Form 8-K Current Report dated April 8, 1997 on
     April 8, 1997 and incorporated herein by reference.
(17) Filed as an exhibit to the Form 10-Q for the quarter ended March 31, 1997
     on May 13, 1997 and incorporated herein by reference.
(18) Filed as an exhibit to the Form 10-Q for the quarter ended June 30, 1997 on
     August 12, 1997 and incorporated herein by reference.
(19) Filed as exhibit 10.47 to the Guilford Form 8-K Current Report dated August
     20, 1997 on September 4, 1997 and incorporated herein by reference.
(20) Filed as an exhibit to the Form 8-K Current Report dated and filed on
     December 5, 1997 and incorporated herein by reference.

                                      31
<PAGE>
 
(21) Filed as an exhibit to the Annual Report on Form 10-K for the year ended
     December 31, 1997 on March 24, 1998 and incorporated herein by reference.
(22) Filed as Exhibit 10.40 to the Guilford Form 10-K for the year ended
     December 31, 1997 and incorporated herein by reference.
(23) Filed as an exhibit to the Form 10-Q for the quarter ended March 31, 1998
     on May 13, 1998 and incorporated herein by reference.

                                       32

<PAGE>
 
                                  EXHIBIT 3.2

                          AMENDED AND RESTATED BYLAWS

                                       OF

                                   AMGEN INC.
                            (a Delaware corporation)



                                   ARTICLE I

                                    Offices

     Section 1.  Registered Office.  The registered office of the corporation in
the State of Delaware shall be in the City of Dover, County of Kent.  (Del. Code
Ann., tit. 8, Section 131)

     Section 2.  Other Offices.  The corporation also shall have and maintain an
office or principal place of business at such place as may be fixed by the Board
of Directors, and also may have offices at such other places, both within and
without the State of Delaware as the Board of Directors may from time to time
determine or the business of the corporation may require.  (Del. Code Ann., tit.
8, Section 122(8))

                                   ARTICLE II

                                 Corporate Seal

     Section 3.  Corporate Seal.  The corporate seal shall consist of a die
bearing the name of the corporation and the inscription, "Corporate Seal-
Delaware."  Said seal may be used by causing it or a facsimile thereof to be
impressed or affixed or reproduced or otherwise.  (Del. Code Ann., tit. 8,
Section 122(3))

                                  ARTICLE III

                             Stockholders' Meetings

     Section 4.  Place of Meetings.  Meetings of the stockholders of the
corporation shall be held at such place, either within or without the State of
Delaware, as may be designated from time to time by the Board of Directors, or,
if not so designated, then at the office of the corporation required to be
maintained pursuant to Section 2 hereof. (Del. Code Ann., tit. 8, Section
211(a))

     Section 5.  Annual Meeting.  The annual meeting of the stockholders of the
corporation shall be held on any date and time which may from time to time be
designated by the Board of Directors.  At such annual meeting, directors shall
be elected and any other business may be transacted that may properly come
before the meeting.  (Del. Code Ann., tit. 8, Section 211(b))
<PAGE>
 
     Section 6.  Special Meetings. Special meetings of the stockholders of the
corporation may be called, for any purpose or purposes, by the Chairman of the
Board of Directors ("Chairman of the Board"), the Chief Executive Officer, the
President, or the Board of Directors at any time. Upon written request of any
stockholder or stockholders holding in the aggregate 20% or more of the voting
power of all stockholders delivered in person or sent by registered mail to the
Chief Executive Officer, the President or Secretary, the Secretary shall call a
special meeting of stockholders to be held at the office of the corporation
required to be maintained pursuant to Section 2 hereof, or at such other place
as may be designated by the Secretary, at such time as the Secretary may fix,
such meeting to be held not less than ten (10) nor more than sixty (60) days
after the receipt of such request, and if the Secretary shall neglect or refuse
to call such meeting, within seven (7) days after the receipt of such request,
the stockholder making such request may do so. (Del. Code Ann., tit. 8, Section
211(d))

     Section 7.  Notice of Meetings.  Except as otherwise provided by law or the
Certificate of Incorporation, written notice of each meeting of stockholders
shall be given not less than ten (10) nor more than sixty (60) days before the
date of the meeting to each stockholder entitled to vote at such meeting, such
notice to specify the place, date and hour and purpose or purposes of the
meeting.  Notice of the time, place and purpose of any meeting of stockholders
may be waived in writing, signed by the person entitled to notice thereof,
either before or after such meeting, and will be waived by any stockholder by
his attendance thereat in person or by proxy, except when the stockholder
attends a meeting for the express purpose of objecting, at the beginning of the
meeting, to the transaction of any business because the meeting is not lawfully
called or convened.  Any stockholder so waiving notice of such meeting shall be
bound by the proceedings of any such meeting in all respects as if due notice
thereof had been given.  (Del. Code Ann., tit. 8, Sections 222, 229)

     Section 8.  Quorum.  At all meetings of stockholders, except where
otherwise provided by statute or by the Certificate of Incorporation, or by
these Bylaws, the presence, in person or by proxy duly authorized, of the
holders of a majority of the outstanding shares of stock entitled to vote shall
constitute a quorum for the transaction of business. Any shares, the voting of
which at said meeting has been enjoined, or which for any reason cannot be
lawfully voted at such meeting, shall not be counted to determine a quorum at
such meeting.  In the absence of a quorum any meeting of stockholders may be
adjourned, from time to time, by vote of the holders of a majority of the shares
represented thereat, but no other business shall be transacted at such meeting.
The stockholders present at a duly called or convened meeting, at which a quorum
is present, may continue to transact business until adjournment, notwithstanding
the withdrawal of enough stockholders to leave less than a quorum.  Except as
otherwise provided by law, the Certificate of Incorporation or these Bylaws, all
action taken by the holders of a majority of the voting power represented at any
meeting at which a quorum is present shall be valid and binding upon the
corporation.  (Del. Code Ann., tit. 8, Section 216)
<PAGE>
 
     Section 9.  Adjournment and Notice of Adjourned Meetings.  Any meeting of
stockholders, whether annual or special, may be adjourned from time to time by
the vote of a majority of the shares, the holders of which are present either in
person or by proxy.  When a meeting is adjourned to another time or place,
notice need not be given of the adjourned meeting if the time and place thereof
are announced at the meeting at which the adjournment is taken. At the adjourned
meeting the corporation may transact any business which might have been
transacted at the original meeting.  If the adjournment is for more than thirty
(30) days, or if after the adjournment a new record date is fixed for the
adjourned meeting, a notice of the adjourned meeting shall be given to each
stockholder of record entitled to vote at the meeting. (Del. Code Ann., tit. 8,
Section 222(c))

     Section 10.  Voting Rights.  For the purpose of determining those
stockholders entitled to vote at any meeting of the stockholders, except as
otherwise provided by law, only persons in whose names shares stand on the stock
records of the corporation on the record date, as provided in Section 12 of
these Bylaws, shall be entitled to vote at any meeting of stockholders. Every
person entitled to vote or execute consents shall have the right to do so either
in person or by an agent or agents authorized by a written proxy executed by
such person or his duly authorized agent, which proxy shall be filed with the
Secretary at or before the meeting at which it is to be used.  An agent so
appointed need not be a stockholder.  No proxy shall be voted on after three (3)
years from its date of creation unless the proxy provides for a longer period.
All elections of Directors shall be by written ballot, unless otherwise provided
in the Certificate of Incorporation. (Del. Code Ann., tit. 8, Sections 211(e),
212(b))

     Section 11.  Joint Owners of Stock. If shares or other securities having
voting power stand of record in the names of two (2) or more persons, whether
fiduciaries, members of a partnership, joint tenants, tenants in common, tenants
by the entirety, or otherwise, or if two (2) or more persons have the same
fiduciary relationship respecting the same shares, unless the Secretary is given
written notice to the contrary and is furnished with a copy of the instrument or
order appointing them or creating the relationship wherein it is so provided,
their acts with respect to voting shall have the following effect:  (a) if only
one (1) votes, his act binds all; (b) if more than one (1) votes, the act of the
majority so voting binds all; (c) if more than one (1) votes, but the vote is
evenly split on any particular matter, each faction may vote the securities in
question proportionally, or may apply to the Delaware Court of Chancery for
relief as provided in the General Corporation Law of Delaware, Section 217(b).
If the instrument filed with the Secretary shows that any such tenancy is held
in unequal interests, a majority or even-split for the purpose of this
subsection (c) shall be a majority or even-split in interest. (Del. Code Ann.,
tit. 8, Section 217(b))
<PAGE>
 
     Section 12.  List of Stockholders.  The Secretary shall prepare and make,
at least ten (10) days before every meeting of stockholders, a complete list of
the stockholders entitled to vote at said meeting, arranged in alphabetical
order, showing the address of each stockholder and the number of shares
registered in the name of each stockholder. Such list shall be open to the
examination of any stockholder, for any purpose germane to the meeting, during
ordinary business hours, for a period of at least ten (10) days prior to the
meeting, either at a place within the city where the meeting is to be held,
which place shall be specified in the notice of the meeting, or, if not
specified, at the place where the meeting is to be held. The list shall be
produced and kept at the time and place of meeting during the whole time
thereof, and may be inspected by any stockholder who is present. (Del. Code
Ann., tit. 8, Section 219(a))

     Section 13.  No Action Without Meeting.  Any action required or permitted
to be taken by the stockholders of the corporation must be effected at a duly
called annual or special meeting of such holders and may not be effected by any
consent in writing by such holders.

     Section 14.  Organization.  At every meeting of stockholders, the Chairman
of the Board, or, if the Chairman of the Board is absent, the Chief Executive
Officer, or, if the Chief Executive Officer is absent, the President, or, if the
President is absent, the most senior Vice President present, or in the absence
of any such officer, a chairman of the meeting chosen by a majority in interest
of the stockholders entitled to vote, present in person or by proxy, shall act
as chairman.  The Secretary, or, in his absence, an Assistant Secretary directed
to do so by the Chief Executive Officer, shall act as secretary of the meeting.

     Section 15.  Notifications of Nominations and Proposed Business.   Subject
to the rights of holders of any class or series of stock having a preference
over the Common Stock as to dividends or upon liquidation,

          (x) nominations for the election of directors, and

          (y) business proposed to be brought before any stockholder meeting,

may be made by the Board of Directors or a proxy committee appointed by the
Board of Directors or by any stockholder entitled to vote in the election of
directors generally. However, any such stockholder may nominate one or more
persons for election as directors at a meeting or propose business to be brought
before a meeting, or both, only if such stockholder has given timely notice in
proper written form of his intent to make such nomination or nominations or to
propose such business.  To be timely, a stockholder's notice must be delivered
to or mailed and received by the Secretary of the corporation not later than 90
days prior to such meeting; provided, however, that in the event that less than
100 days' notice or prior public disclosure of the date of
<PAGE>
 
the meeting is given or made to stockholders, notice by the stockholder to be
timely must be received not later than the close of business on the 10th day
following the date on which such notice of the date of such meeting was mailed
or such public disclosure was made.  To be in proper written form, a
stockholder's notice to the Secretary shall set forth:

     (a) the name and address of the stockholder who intends to make the
nominations or propose the business and, as the case may be, of the person or
persons to be nominated or of the business to be proposed;

     (b) a representation that the stockholder is a holder of record of stock of
the corporation entitled to vote at such meeting and, if applicable, intends to
appear in person or by proxy at the meeting to nominate the person or persons
specified in the notice;

     (c) if applicable, a description of all arrangements or understandings
between the stockholder and each nominee and any other person or persons (naming
such person or persons) pursuant to which the nomination or nominations are to
be made by the stockholder;

     (d) such other information regarding each nominee or each matter of
business to be proposed by such stockholder as would be required to be included
in a proxy statement filed pursuant to the proxy rules of the Securities and
Exchange Commission had the nominee been nominated, or intended to be nominated,
or the matter been proposed, or intended to be proposed by the Board of
Directors; and

     (e) if applicable, the consent of each nominee to serve as director of the
corporation if so elected.

The chairman of the meeting may refuse to acknowledge the nomination of any
person or the proposal of any business not made in compliance with the foregoing
procedure.

                                   ARTICLE IV

                                   Directors

     Section 16.   Number.  The authorized number of directors of the
corporation shall be fixed from time to time by the Board of Directors.  The
number of directors presently authorized is eight.  Directors need not be
stockholders unless so required by the Certificate of Incorporation.  If for any
cause the directors shall not have been elected at an annual meeting, they may
be elected as soon thereafter as convenient at a special meeting of the
stockholders called for that purpose in the manner provided in these Bylaws.
(Del. Code Ann., tit. 8, Sections 141(b), 211(b), (c))
<PAGE>
 
     Section 17.   Classes of Directors.  The Board of Directors shall be
divided into three classes:  Class I, Class II and Class III, which shall be as
nearly equal in number as possible. Each director shall serve for a term ending
on the date of the third annual meeting of stockholders following the annual
meeting at which the director was elected.  Notwithstanding the foregoing
provisions of this section, each director shall serve until his successor is
duly elected and qualified or until his death, resignation or removal.  (Del.
Code Ann., tit. 8, Section 141(d))

     Section 18.   Newly Created Directorships and Vacancies.  In the event of
any increase or decrease in the authorized number of directors, the newly
created or eliminated directorships resulting from such increase or decrease
shall be apportioned by the Board of Directors among the three classes of
directors so as to maintain such classes as nearly equal in number as possible.
No decrease in the number of directors constituting the Board of Directors shall
shorten the term of any incumbent director.  Newly created directorships
resulting from any increase in the number of directors and any vacancies on the
Board of Directors resulting from death, resignation, disqualification, removal
or other cause shall be filled by the affirmative vote of a majority of the
remaining directors then in office (and not by stockholders), even though less
than a quorum of the authorized Board of Directors.  Any director elected in
accordance with the preceding sentence shall hold office for the remainder of
the full term of the class of directors in which the new directorship was
created or the vacancy occurred and until such director's successors shall have
been elected and qualified.

     Section 19.   Powers.  The powers of the corporation shall be exercised,
its business conducted and its property controlled by the Board of Directors,
except as may be otherwise provided by statute or by the Certificate of
Incorporation (Del. Code Ann., tit. 8, Section 141(a))

     Section 20.   Resignation.  Any director may resign at any time by
delivering his written resignation to the Secretary, such resignation to specify
whether it will be effective at a particular time, upon receipt by the Secretary
or at the pleasure of the Board of Directors.  If no such specification is made,
it shall be deemed effective at the pleasure of the Board of Directors.  When
one or more directors shall resign from the Board of Directors, effective at a
future date, a majority of the directors then in office, including those who
have so resigned, shall have power to fill such vacancy or vacancies, the vote
thereon to take effect when such resignation or resignations shall become
effective, and each Director so chosen shall hold office for the unexpired
portion of the term of the director whose place shall be vacated and until his
successor shall have been duly elected and qualified.  (Del. Code Ann., tit. 8,
Sections 141(b), 223(d))

     Section 21.   Removal.  At a special meeting of stockholders called for the
purpose in the manner hereinabove provided, the Board of Directors, or any
individual director, may be removed from office, (a) with cause, and one or more
new directors may be
<PAGE>
 
elected, by a vote of stockholders holding a majority of the outstanding shares
entitled to vote at an election of Directors or (b), without cause, by a vote of
stockholders holding at least 66.67% of the outstanding shares entitled to vote
at an election of directors. (Del. Code Ann., tit. 8, Section 141(k))

     Section 22.   Meetings.

          (a)  Annual Meetings.  The annual meeting of the Board of Directors
shall be held on the date of the annual meeting of stockholders and at the place
where such meeting is held. No notice of an annual meeting of the Board of
Directors shall be necessary and such meeting shall be held for the purpose of
electing officers and transacting such other business as may lawfully come
before it.

          (b) Regular Meetings.  Except as hereinafter otherwise provided,
regular meetings of the Board of Directors shall be held in the office of the
corporation required to be maintained pursuant to Section 2 hereof.  Unless
otherwise restricted by the Certificate of Incorporation, regular meetings of
the Board of Directors also may be held at any place within or without the State
of Delaware which has been designated by resolution of the Board of Directors or
the written consent of all Directors.  (Del. Code Ann., tit. 8, Section 141(g))

          (c) Special Meetings.  Unless otherwise restricted by the Certificate
of Incorporation, special meetings of the Board of Directors may be held at any
time and place within or without the State of Delaware whenever called by the
Chairman of the Board, the Chief Executive Officer, the President or a majority
of the Directors. (Del. Code Ann., tit. 8, Section 141(g))

          (d) Telephone Meetings.  Any member of the Board of Directors, or of
any committee thereof, may participate in a meeting by means of conference
telephone or similar communications equipment by means of which all persons
participating in the meeting can hear each other, and participation in a meeting
by such means shall constitute presence in person at such meeting.  (Del. Code
Ann., tit. 8, Section 141(i))

          (e) Notice of Meetings.  Written notice of the time and place of all
regular and special meetings of the Board of Directors shall be given at least
one (1) day before the date of the meeting.  Notice of any meeting may be waived
in writing at any time before or after the meeting and will be waived by any
director by attendance thereat, except when the director attends the meeting for
the express purpose of objecting, at the beginning of the meeting, to the
transaction of any business because the meeting is not lawfully called or
convened.  (Del. Code Ann., tit. 8, Section 229)

          (f)  Waiver of Notice.  The transaction of all business at any meeting
of the Board of Directors, or any committee thereof, however called or noticed,
or wherever held, shall be as valid as though taken at a meeting duly held after
regular call and notice, if a quorum is present and if, either before or after
<PAGE>
 
the meeting, each of the Directors not present sign a written waiver of notice,
or a consent to holding such meeting, or an approval of the minutes thereof. All
such waivers, consents or approvals shall be filed with the corporate records or
made a part of the minutes of the meeting.  (Del. Code Ann., tit. 8, Section
229)

     Section 23.  Quorum and Voting.

          (a) Quorum.  Unless the Certificate of Incorporation requires a
greater number, a quorum of the Board of Directors shall consist of a majority
of the exact number of Directors fixed from time to time in accordance with
Section 16 of these Bylaws, but not less than one (1); provided, however, at any
meeting whether a quorum is present or otherwise, a majority of the directors
present may adjourn from time to time until the time fixed for the next regular
meeting of the Board of Directors, without notice other than by announcement at
the meeting.  (Del. Code Ann., tit. 8, Section 141(b))

          (b)  Majority Vote.  At each meeting of the Board of Directors at
which a quorum is present all questions and business shall be determined by a
vote of a majority of the Directors present, unless a different vote is required
by law, the Certificate of Incorporation or these Bylaws.  (Del. Code Ann., tit.
8, Section 141(b))

     Section 24.   Action without Meeting.  Unless otherwise restricted by the
Certificate of Incorporation or these Bylaws, any action required or permitted
to be taken at any meeting of the Board of Directors or of any committee thereof
may be taken without a meeting, if all members of the Board of Directors or
committee, as the case may be, consent thereto in writing, and such writing or
writings are filed with the minutes of proceedings of the Board of Directors or
committee.  (Del. Code Ann., tit. 8, Section 141(f))

     Section 25.   Fees and Compensation.  Directors shall not receive any
stated salary for their services as Directors, but by resolution of the Board of
Directors a fixed fee, with or without expense of attendance, may be allowed for
serving on the Board of Directors and/or attendance at each meeting and at each
meeting of any committee of the Board of Directors. Nothing herein contained
shall be construed to preclude any director from serving the corporation in any
other capacity as an officer, agent, consultant, employee, or otherwise and
receiving compensation therefor. (Del. Code Ann., tit. 8, Section 141(h))

     Section 26.  Committees.

          (a)  Executive Committee.  The Board of Directors may by resolution
passed by a majority of the whole Board of Directors, appoint an Executive
Committee to consist of one (1) or more members of the Board of Directors. The
Executive Committee, to the extent permitted by law and specifically granted by
the Board of Directors, shall have and may exercise when the Board of Directors
is not in session all powers of the Board of Directors in the
<PAGE>
 
management of the business and affairs of the corporation, including, without
limitation, the power and authority to declare a dividend or to authorize the
issuance of stock, except such committee shall not have the power or authority
to amend the Certificate of Incorporation (except that the committee may, to the
extent authorized in the resolution or resolutions providing for the issuance of
shares of stock adopted by the Board of Directors as provided by law, fix any of
the preferences or rights of such shares relating to dividends, redemption,
dissolution, any distribution of assets of the corporation or the conversion
into, or the exchange of such shares for shares of any other class or classes or
any other series of the same or any other class or classes of stock of the
corporation), to adopt an agreement of merger or consolidation, to recommend to
the stockholders the sale, lease or exchange of all or substantially all of the
corporation's property and assets, to recommend to the stockholders a
dissolution of the corporation or a revocation of a dissolution or to amend
these Bylaws. (Del. Code Ann., tit. 8, Section 141(c))

          (b) Other Committees.  The Board of Directors may, by resolution
passed by a majority of the whole Board of Directors, from time to time appoint
such other committees as may be permitted by law.  Such other committees
appointed by the Board of Directors shall consist of one (1) or more members of
the Board of Directors, and shall have such powers and perform such duties as
may be prescribed by the resolution or resolutions creating such committees, but
in no event shall such committee have the powers denied to the Executive
Committee in these Bylaws. (Del. Code Ann., tit. 8, Section 141(c))

          (c) Term.  Each member of a committee of the Board of Directors shall
serve a term on the committee coexistent with such member's term on the Board of
Directors.  The Board of Directors, subject to the provisions of subsections (a)
or (b) of this Section 26, may at any time increase or decrease the number of
members of a committee or terminate the existence of a committee.  The
membership of a committee member shall terminate on the date of his death or
voluntary resignation.  The Board of Directors may at any time for any reason
remove any individual committee member and the Board of Directors may fill any
committee vacancy created by death, resignation, removal or increase in the
number of members of the committee.  The Board of Directors may designate one or
more Directors as alternate members of any committee, who may replace any absent
or disqualified member at any meeting of the committee, and, in addition, in the
absence or disqualification of any member of a committee, the member or members
thereof present at any meeting and not disqualified from voting, whether or not
he or they constitute a quorum, may unanimously appoint another member of the
Board of Directors to act at the meeting in the place of any such absent or
disqualified member. (Del. Code Ann., tit. 8, Section 141(c))

          (d) Meetings.  Unless the Board of Directors shall otherwise provide,
regular meetings of the Executive Committee or any other committee appointed
pursuant to this Section 26 shall be held at such times and places as are
determined by the Board of
<PAGE>
 
Directors, or by any such committee, and when notice thereof has been given to
each member of such committee, no further notice of such regular meetings need
be given thereafter.  Special meetings of any such committee may be held at the
principal office of the corporation required to be maintained pursuant to
Section 2 hereof, or at any place which has been designated from time to time by
resolution of such committee or by written consent of all members thereof, and
may be called by any director who is a member of such committee, upon written
notice to the members of such committee of the time and place of such special
meeting given in the manner provided for the giving of written notice to members
of the Board of Directors of the time and place of special meetings of the Board
of Directors.  Notice of any special meeting of any committee may be waived in
writing at any time before or after the meeting and will be waived by any
director by attendance thereat, except when the director attends such special
meeting for the express purpose of objecting, at the beginning of the meeting,
to the transaction of any business because the meeting is not lawfully called or
convened.  A majority of the authorized number of members of any such committee
shall constitute a quorum for the transaction of business, and the act of a
majority of those present at any meeting at which a quorum is present shall be
the act of such committee.  (Del. Code Ann., tit. 8, Sections 141(c), 229)

     Section 27.   Organization.  At every meeting of the directors, the
Chairman of the Board, or, if the Chairman of the Board is absent, the Chief
Executive Officer, or if the Chief Executive Officer is absent, the President,
or if the President is absent, the most senior Vice President, or, in the
absence of any such officer, a chairman of the meeting chosen by a majority of
the directors present, shall preside over the meeting.  The Secretary, or in his
absence, an Assistant Secretary directed to do so by the Chief Executive
Officer, shall act as secretary of the meeting.

                                   ARTICLE V

                                   Officers

     Section 28.   Officers Designated. The officers of the corporation shall be
the Chairman of the Board, the Chief Executive Officer, the President and Chief
Operating Officer, one or more Vice Presidents, the Chief Financial Officer and
the Secretary, all of whom shall be elected at the annual meeting of the Board
of Directors.  The Board of Directors also may appoint such other officers and
agents with such powers and duties as it shall deem necessary. The order of the
seniority of the Vice Presidents shall be in the order of their nomination,
unless otherwise determined by the Board of Directors.  The Board of Directors
may assign such additional titles to one or more of the officers as it shall
deem appropriate.  Any one person may hold any number of offices of the
corporation at any one time unless specifically prohibited therefrom by law.
The salaries and other compensation of the officers of the corporation shall be
fixed by or in the manner designated by the Board of Directors.
<PAGE>
 
     Section 29.   Tenure and Duties of Officers.

          (a) General.  All officers shall hold office at the pleasure of the
Board of Directors and until their successors shall have been duly elected and
qualified, unless sooner removed.  Any officer elected or appointed by the Board
of Directors may be removed at any time by the Board of Directors.  If the
office of any officer becomes vacant for any reason, the vacancy may be filled
by the Board of Directors.

          (b) Duties of Chairman of the Board.  The Chairman of the Board,
subject to the control of the Board of Directors, shall perform such duties and
functions as are necessary to further the strategic direction of the
corporation.  Unless the Board of Directors designates another person, the
Chairman of the Board shall preside at all meetings of the stockholders, the
Board of Directors and of the Executive Committee.

          (c) Duties of Chief Executive Officer.  The Chief Executive Officer,
at the request of the Chairman of the Board or upon his absence or disability,
or in the event of a vacancy in the office of Chairman of the Board, shall
exercise all the powers of Chairman of the Board as provided in Subsection
29(b).  The Chief Executive Officer shall, subject to the control of the Board
of Directors, exercise general management and supervision over the property,
affairs and business of the corporation and shall authorize officers of the
corporation, other than the Chairman of the Board, to exercise such powers as
he, in his discretion, may deem to be in the best interests of the corporation.
The Chief Executive Officer shall in general perform all duties incident to
general management and supervision of the corporation and such other duties as
the Board of Directors shall designate from time to time.

          (d) Duties of President and Chief Operating Officer.  The President
and Chief Operating Officer, at the request of the Chief Executive Officer or
upon his absence or disability, or in the event of a vacancy in the office of
Chief Executive Officer, shall exercise all the powers of Chief Executive
Officer as provided in Subsection 29(c).  The President and Chief Operating
Officer shall, subject to the control of the Chief Executive Officer and the
Board of Directors, exercise general management and supervision over the
operating functions of the corporation, and shall authorize officers of the
corporation, other than the Chairman of the Board and the Chief Executive
Officer, to exercise such powers with respect to the operating function of the
corporation as he, in his discretion, may deem to be in the best interests of
the corporation.  The President and Chief Operating Officer shall perform such
other duties and have such other powers as the Board of Directors shall
designate from time to time.

          (e) Duties of Vice Presidents.  The Vice Presidents, in the order of
their seniority, may assume and perform the duties of the President and Chief
Operating Officer in the absence or disability of the Chief Executive Officer
and the President and Chief Operating Officer or whenever the offices of Chief
Operating Officer and President and Chief Operating Officer are vacant.  The
<PAGE>
 
Vice Presidents shall perform other duties commonly incident to their office and
also shall perform such other duties and have such other powers as the Board of
Directors, the Chief Executive Officer, or the President and Chief Operating
Officer shall designate from time to time.

          (f) Duties of Chief Financial Officer.  The Chief Financial Officer
shall keep or cause to be kept the books of account of the corporation in a
thorough and proper manner, and shall render statements of the financial affairs
of the corporation in such form and as often as required by the Board of
Directors or the Chief Executive Officer.  The Chief Financial Officer, subject
to the order of the Board of Directors, shall have the custody of all funds and
securities of the corporation.  The Chief Financial Officer shall perform other
duties commonly incident to his office and also shall perform such other duties
and have such other powers as the Board of Directors or the Chief Executive
Officer shall designate from time to time.  The Chief Executive Officer may
direct any Assistant Chief Financial Officer to assume and perform the duties of
the Chief Financial Officer in the absence or disability of the Chief Financial
Officer, and each Assistant Chief Financial Officer shall perform other duties
commonly incident to his office and also shall perform such other duties and
have such other powers as the Board of Directors or the Chief Executive Officer
shall designate from time to time.

          (g) Duties of Secretary.  The Secretary shall attend all meetings of
the stockholders and of the Board of Directors, and shall record all acts and
proceedings thereof in the minute books of the corporation.  The Secretary shall
give notice in conformity with these Bylaws of all meetings of the stockholders,
and of all meetings of the Board of Directors and any committee thereof
requiring notice.  The Secretary shall perform all other duties given him in
these Bylaws and other duties commonly incident to his office and also shall
perform such other duties and have such other powers as the Board of Directors
shall designate from time to time.  The Chief Executive Officer may direct any
Assistant Secretary to assume and perform the duties of the Secretary in the
absence or disability of the Secretary, and each Assistant Secretary shall
perform other duties commonly incident to his office and also shall perform such
other duties and have such other powers as the Board of Directors or the Chief
Executive Officer shall designate from time to time.

     Section 30.   Resignations.  Any officer may resign at any time by giving
written notice to the Board of Directors or to the Chief Executive Officer or to
the President or to the Secretary.  Any such resignation shall be effective when
received by the person or persons to whom such notice is given, unless a later
time is specified therein, in which event the resignation shall become effective
at such later time.  Unless otherwise specified in such notice, the acceptance
of any such resignation shall not be necessary to make it effective.  (Del. Code
Ann., tit. 8, Section 142(b))
<PAGE>
 
     Section 31.   Removal.  Any officer may be removed from office at any time,
with or without cause, by the vote or written consent of a majority of the
directors in office at the time, or by any committee or superior officers upon
whom such power of removal may have been conferred by the Board of Directors.

     Section 32.   Compensation.  The compensation of the officers shall be
fixed from time to time by the Board of Directors, and no officer shall be
prevented from receiving such compensation by reason of the fact that such
officer is also a director of the corporation.

                                   ARTICLE VI

                 Execution of Corporate Instruments and Voting
                     of Securities Owned by the Corporation

     Section 33.   Execution of Corporate Instruments.  The Board of Directors
may, in its discretion, determine the method and designate the signatory officer
or officers, or other person or persons, to execute on behalf of the corporation
any corporate instrument or document, or to sign on behalf of the corporation
the corporate name without limitation, or to enter into contracts on behalf of
the corporation, except where otherwise provided by law or these Bylaws, and
such execution or signature shall be binding upon the corporation.  (Del. Code
Ann., tit. 8, Sections 103(a), 142(a), 158)

          Unless otherwise specifically determined by the Board of Directors or
otherwise required by law, promissory notes, deeds of trust, mortgages and other
evidences of indebtedness of the corporation, and other corporate instruments or
documents requiring the corporate seal, and certificates of shares of stock
owned by the corporation, shall be executed, signed or endorsed by the Chairman
of the Board, or the Chief Executive Officer, or the President or any Vice
President, and by the Secretary or Treasurer or any Assistant Secretary or
Assistant Treasurer.  All other instruments and documents requiring the
corporate signature, but not requiring the corporate seal, may be executed as
aforesaid or in such other manner as may be directed by the Board of Directors.
(Del. Code Ann., tit. 8, Sections 103(a), 142(a), 158)

          All checks and drafts drawn on banks or other depositaries on funds to
the credit of the corporation or in special accounts of the corporation shall be
signed by such person or persons as the Board of Directors shall authorize so to
do.  (Del. Code Ann., tit. 8, Sections 103(a), 142(a), 158)

     Section 34.   Voting of Securities Owned by the Corporation.  All stock and
other securities of other corporations owned or held by the corporation for
itself, or for other parties in any capacity, shall be voted, and all proxies
with respect thereto shall be executed, by the person authorized to do so by
resolution of the Board of Directors, or, in the absence of such authorization,
by the Chairman of the Board, the Chief Executive Officer, the President, or any
Vice President. (Del. Code Ann., tit. 8, Section 123)
<PAGE>
 
                                  ARTICLE VII

                                Shares of Stock

     Section 35.   Form and Execution of Certificates.  The shares of the
corporation shall be represented by certificates, provided that the Board of
Directors of the corporation may provide by resolution or resolutions that some
or all of any or all classes or series of its stock shall be uncertificated
shares.  Any such resolution shall not apply to shares represented by a
certificate until such certificate is surrendered to the corporation.
Notwithstanding the adoption of such a resolution by the Board of Directors,
every holder of stock represented by certificates and upon request every holder
of uncertificated shares shall be entitled to have a certificate signed by, or
in the name of the corporation by, the Chairman of the Board or any vice-
chairman of the Board of Directors, or the Chief Executive Officer, or the
President or any Vice-President, and by the Treasurer or an Assistant Treasurer,
or the Secretary or an Assistant Secretary of the corporation representing the
number of shares registered in certificate form.  Any or all the signatures on
the certificate may be a facsimile. In case any officer, transfer agent, or
registrar who has signed or whose facsimile signature has been placed upon a
certificate shall have ceased to be such officer, transfer agent or registrar
before such certificate is issued, it may be issued by the corporation with the
same effect as if he were such officer, transfer agent or registrar at the date
of issue.  (Del. Code Ann., tit. 8, Section 158)

     Section 36.   Lost Certificates.  The corporation may issue a new
certificate of stock or uncertificated shares in place of any certificate
theretofore issued by the corporation alleged to have been lost, stolen or
destroyed, and the corporation may require the owner of such lost, stolen or
destroyed certificate, or his legal representative, to give the corporation a
bond sufficient to indemnify it against any claim that may be made against the
corporation on account of the alleged loss, theft or destruction of any such
certificate or the issuance of such new certificate or uncertificated shares.
(Del. Code Ann., tit. 8, Section 167)

     Section 37.   Transfers.  Transfers of record of shares of stock of the
corporation shall be made only upon its books by the holders thereof, in person
or by attorney duly authorized, and upon the surrender of a properly endorsed
certificate or certificates for a like number of shares. (Del. Code Ann., tit.
6, Section 8-401(1))

     Section 38.   Fixing Record Dates.  In order that the corporation may
determine the stockholders entitled to notice of or to vote at any meeting of
stockholders or any adjournment thereof, or to express consent to corporate
action in writing without a meeting, or entitled to receive payment of any
dividend or other distribution or allotment of any rights, or entitled to
exercise any rights in respect of any change, conversion or exchange of stock or
for the purpose of any other lawful action,
<PAGE>
 
the Board of Directors may fix, in advance, a record date, which shall not be
more than sixty (60) nor less than ten (10) days before the date of such
meeting, nor more than sixty (60) days prior to any other action.  If no record
date is fixed:  (a) the record date for determining stockholders entitled to
notice of or to vote at a meeting of stockholders shall be at the close of
business on the day next preceding the day on which notice is given, or, if
notice is waived, at the close of business on the day next preceding the day on
which the meeting is held; and (b) the record date for determining stockholders
for any other purpose shall be at the close of business on the day on which the
Board of Directors adopts the resolution relating thereto.  A determination of
stockholders of record entitled to notice of or to vote at a meeting of
stockholders shall apply to any adjournment of the meeting; provided, however,
that the Board of Directors may fix a new record date for the adjourned meeting.
(Del. Code Ann., tit. 8, Section 213)

     Section 39.   Registered Stockholders.  The corporation shall be entitled
to recognize the exclusive right of a person registered on its books as the
owner of shares to receive dividends, and to vote as such owner, and shall not
be bound to recognize any equitable or other claim to or interest in such share
or shares on the part of any other person whether or not it shall have express
or other notice thereof, except as otherwise provided by the laws of Delaware.
(Del. Code Ann., tit. 8, Sections 213(a), 219)

     Section 40.   Issuance, Transfer and Resignation of Shares.  The Board of
Directors may make such rules and regulations, not inconsistent with law or with
these Bylaws, as it may deem advisable concerning the issuance, transfer and
registration of certificates for shares of the capital stock of the corporation.
The Board of Directors may appoint a transfer agent or registrar of transfers,
or both, and may require all certificates for shares of the corporation to bear
the signature of either or both.

                                  ARTICLE VIII

                      Other Securities of the Corporation

     Section 41.   Execution of Other Securities.  All bonds, debentures and
other corporate securities of the corporation, other than stock certificates,
may be signed by the Chairman of the Board, the Chief Executive Officer, the
President or any Vice President, or such other person as may be authorized by
the Board of Directors, and the corporate seal impressed thereon or a facsimile
of such seal imprinted thereon and attested by the signature of the Secretary or
an Assistant Secretary, or the Treasurer or an Assistant Treasurer; provided,
however, that where any such bond, debenture or other corporate security shall
be authenticated by the manual signature of a trustee under an indenture
pursuant to which such bond, debenture or other corporate security shall be
issued, the signatures of the persons signing and attesting the corporate seal
on such bond, debenture or other corporate security may be the imprinted
facsimile of the
<PAGE>
 
signatures of such persons.  Interest coupons appertaining to any such bond,
debenture or other corporate security, authenticated by a trustee as aforesaid,
shall be signed by the Treasurer or an Assistant Treasurer of the corporation or
such other person as may be authorized by the Board of Directors, or bear
imprinted thereon the facsimile signature of such person.  In case any officer
who shall have signed or attested any bond, debenture or other corporate
security, or whose facsimile signature shall appear thereon or on any such
interest coupon, shall have ceased to be such officer before the bond, debenture
or other corporate security so signed or attested shall have been delivered,
such bond, debenture or other corporate security nevertheless may be adopted by
the corporation and issued and delivered as though the person who signed the
same or whose facsimile signature shall have been used thereon had not ceased to
be such officer of the corporation.

                                   ARTICLE IX

                                   Dividends

     Section 42.   Declaration of Dividends.  Dividends upon the capital stock
of the corporation, subject to the provisions of the Certificate of
Incorporation, if any, may be declared by the Board of Directors pursuant to law
at any regular or special meeting.  Dividends may be paid in cash, in property,
or in shares of the capital stock, subject to the provisions of the Certificate
of Incorporation.  (Del. Code Ann., tit. 8, Sections 170, 173)

     Section 43.   Dividend Reserve.  Before payment of any dividend, there may
be set aside out of any funds of the corporation available for dividends such
sum or sums as the Board of Directors may from time to time, in its absolute
discretion, think proper as a reserve or reserves to meet contingencies, or for
equalizing dividends, or for repairing or maintaining any property of the
corporation, or for such other purpose as the Board of Directors shall think
conducive to the interests of the corporation, and the Board of Directors may
modify or abolish any such reserve in the manner in which it was created.  (Del.
Code Ann., tit. 8, Section 171)

                                   ARTICLE X

                                  Fiscal Year

     Section 44.   Fiscal Year.  Unless otherwise fixed by resolution of the
Board of Directors, effective as of January 1, 1992, the fiscal year of the
corporation shall end on the 31st day of the month of December in each calendar
year.

                                   ARTICLE XI

                     Indemnification of Directors, Officers
                           Employees and Other Agents

     Section 45.    Indemnification of Directors, Officers, Employees and Other
Agents.
<PAGE>
 
          (a) Directors and Officers.  The corporation shall indemnify its
directors and officers to the full extent permitted by the Delaware General
Corporation Law, as the same exists or may hereafter be amended (but, in the
case of any such amendment, only to the extent that such amendment permits the
corporation to provide broader indemnification rights than said Law permitted
the corporation to provide prior to such amendment); provided, further, that the
corporation shall not be required to indemnify any director or officer in
connection with any proceeding (or part thereof) initiated by such person or any
proceeding by such person against the corporation or its directors, officers,
employees or other agents unless (i) such indemnification is expressly required
to be made by law, (ii) the proceeding was authorized by the Board of Directors
of the corporation or (iii) such indemnification is provided by the corporation,
in its sole discretion, pursuant to the powers vested in the corporation under
the Delaware General Corporation Law, or (iv) such indemnification is required
to be made under subsection (d) of this Article XI.

          (b) Other Employees and Other Agents.  The corporation shall have the
power to indemnify its other employees and other agents as set forth in the
Delaware General Corporation Law.

          (c) Expenses.  The corporation shall advance to any person who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative, by reason of the fact that he is or was a director or officer of
the corporation, or is or was serving at the request of the corporation as a
director or officer of another corporation, partnership, joint venture, trust or
other enterprise, prior to the final disposition of any such proceeding,
promptly following request therefor, all expenses incurred by any director or
officer in connection with such proceeding upon receipt of any undertaking by or
on behalf of such person to repay said amounts if it should be determined
ultimately that such person is not entitled to be indemnified under this Bylaw
or otherwise.

          Notwithstanding the foregoing, unless otherwise determined pursuant to
paragraph (d) of this Bylaw, no advance shall be made by the corporation to an
officer of the corporation in any action, suit or proceeding, whether civil,
criminal, administrative or investigate, if a determination is reasonably and
promptly made (1) by the Board of Directors by a majority vote of a quorum
consisting of directors who were not parties to the proceeding, or (2) if such
quorum is not obtainable, or, even if obtainable, a quorum of disinterested
directors so directs, by independent legal counsel in a written opinion that,
the facts known to the decision-making party at the time such determination is
made demonstrate clearly and convincingly that such person acted in bad faith or
in a manner that such person did not reasonably believe to be in or not opposed
to the best interests of the corporation, or, with respect to any criminal
action or proceeding, such person believed or had reasonable cause to believe
his conduct was unlawful, except by reason of the fact
<PAGE>
 
that such officer is or was a director of the corporation or is or was serving
at the request of the corporation as a director of another corporation, joint
venture, trust or other enterprise in which event this paragraph shall not
apply.

          (d) Enforcement. Without the necessity of entering into an express
contract, all rights to indemnification and advances under this Bylaw shall be
deemed to be contractual rights and be effective to the same extent and as if
provided for in a contract between the corporation and the director or officer
who serves in such capacity at any time while this Bylaw and other relevant
provisions of the Delaware General Corporation Law and other applicable law, if
any, are in effect.  Any right to indemnification or advances granted by this
Bylaw to a director or officer shall be enforceable by or on behalf of the
person holding such right in any court of competent jurisdiction if (i) the
claim for indemnification or advances is denied, in whole or in part, or (ii) no
disposition of such claim is made within ninety (90) days of request therefor.
The claimant in such enforcement action, if successful in whole or in part,
shall be entitled to be paid also the expense of prosecuting his claim.  In
connection with any claim for indemnification, the corporation shall be entitled
to raise as a defense to any such action that the claimant has not met the
standards of conduct which make it permissible under the Delaware General
Corporation Law for the corporation to indemnify the claimant for the amount
claimed.  In connection with any claim by an officer of the corporation (except
in any action, suit or proceeding, whether civil, criminal, administrative or
investigative, by reason of the fact that such officer is or was a director of
the corporation or is or was serving at the request of the corporation as a
director of another corporation, partnership, joint venture, trust or other
enterprise) for advances, the corporation shall be entitled to raise a defense
as to any such action clear and convincing evidence that such person acted in
bad faith or in a manner that such person did not reasonably believe to be in or
not opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, such person believed or had reasonable cause to
believe his conduct was unlawful.  Neither the failure of the corporation
(including its Board of Directors, independent legal counsel or its
stockholders) to have made a determination prior to the commencement of such
action that indemnification of the claimant is proper in the circumstances
because he has met the applicable standard of conduct set forth in the Delaware
General Corporation Law, nor an actual determination by the corporation
(including its Board of Directors, independent legal counsel or its
stockholders) that the claimant has not met such applicable standard of conduct,
shall be a defense to the action or create a presumption that claimant has not
met the applicable standard of conduct.  In any suit brought by a director or
officer to enforce a right to indemnification or to an advancement of expenses
hereunder, the burden of proving that the director or officer is not entitled to
be indemnified, or to such advancement of expenses, under this Article XI or
otherwise shall be on the corporation.
<PAGE>
 
          (e) Non-Exclusivity of Rights.  The rights conferred on any person by
this Bylaw shall not be exclusive of any other right which such person may have
or hereafter acquire under any statute, provision of the Certificate of
Incorporation, Bylaws, agreement, vote of stockholders or disinterested
directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding office.  The corporation is
specifically authorized to enter into individual contracts with any or all of
its directors, officers, employees or agents respecting indemnification and
advances, as provided by law.

          (f) Survival of Rights.  The rights conferred on any person by this
Bylaw shall continue as to a person who has ceased to be a director, officer,
employee or other agent and shall inure to the benefit of the heirs, executors
and administrators of such a person.

          (g) Insurance.  To the fullest extent permitted by the Delaware
General Corporation Law, the corporation, upon approval by the Board of
Directors, may purchase insurance on behalf of any person required or permitted
to be indemnified pursuant to this Bylaw.

          (h) Amendments.  Any repeal or modification of this Bylaw shall only
be prospective and shall not affect the rights under this Bylaw in effect at the
time of the alleged occurrence of any action or omission to act that is the
cause of any proceeding against any agent of the corporation.

          (i) Savings Clause.  If this Bylaw or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
corporation shall nevertheless indemnify each director and officer to the full
extent permitted by any applicable portion of this Bylaw that shall not have
been invalidated, or by any other applicable law.

          (j) Certain Definitions.  For the purposes of this Bylaw, the
following definitions shall apply:

               (i) The term "proceeding" shall be broadly construed and shall
          include, without limitation, the investigation, preparation,
          prosecution, defense, settlement, arbitration and appeal of, and the
          giving of testimony in, any threatened, pending or completed action,
          suit or proceeding, whether civil, criminal, administrative or
          investigative.

               (ii) The term "expenses" shall be broadly construed and shall
          include, without limitation, court costs, attorneys' fees, witness
          fees, fines, amounts paid in settlement or judgment and any other
          costs and expenses of any nature or kind incurred in connection with
          any proceeding.
<PAGE>
 
               (iii)  The term the "corporation" shall include, in addition to
          the resulting corporation, any constituent corporation (including any
          constituent of a constituent) absorbed in a consolidation or merger
          which, if its separate existence had continued, would have had power
          and authority to indemnify its directors, officers, and employees or
          agents, so that any person who is or was a director, officer, employee
          or agent of such constituent corporation, or is or was serving at the
          request of such constituent corporation as a director, officer,
          employee or agent of another corporation, partnership, joint venture,
          trust or other enterprise, shall stand in the same position under the
          provisions of this Bylaw with respect to the resulting or surviving
          corporation as he would have with respect to such constituent
          corporation if its separate existence had continued.

               (iv) References to a "director," "officer," "employee," or
          "agent" of the corporation shall include, without limitation,
          situations where such person is serving at the request of the
          corporation as, respectively, a director, officer, employee, trustee
          or agent of another corporation, partnership, joint venture, trust or
          other enterprise.

               (v) References to "other enterprises" shall include employee
          benefit plans; references to "fines" shall include any excise taxes
          assessed on a person with respect to any employee benefit plan; and
          references to "serving at the request of the corporation" shall
          include any service as a director, officer, employee or agent of the
          corporation which imposes duties on, or involves services by, such
          director, officer, employee, or agent with respect to an employee
          benefit plan, its participants, or beneficiaries; and a person who
          acted in good faith and in a manner he reasonably believed to be in
          the interest of the participants and beneficiaries of an employee
          benefit plan shall be deemed to have acted in a manner "not opposed to
          the best interests of the corporation" as referred to in this Bylaw.

                                  ARTICLE XII

                                    Notices

     Section 46.   Notices.

          (a) Notice to Stockholders.  Whenever under any provisions of these
Bylaws notice is required to be given to any stockholder, it shall be given in
writing, timely and duly deposited in the United States mail, postage prepaid,
and addressed to his last known post office address as shown by the stock record
of the corporation or its transfer agent.  (Del. Code Ann., tit. 8, Section 222)
<PAGE>
 
          (b) Notice to Directors.  Any notice required to be given to any
director may be given by the method stated in subsection (a), or by telegram,
except that such notice other than one which is delivered personally shall be
sent to such address as such director shall have filed in writing with the
Secretary, or, in the absence of such filing, to the last known post office
address of such director.

          (c) Address Unknown.  If no address of a stockholder or director be
known, notice may be sent to the office of the corporation required to be
maintained pursuant to Section 2 hereof.

          (d) Affidavit of Mailing.  An affidavit of mailing, executed by a duly
authorized and competent employee of the corporation or its transfer agent
appointed with respect to the class of stock affected, specifying the name and
address or the names and addresses of the stockholder or stockholders, or
director or directors, to whom any such notice or notices was or were given, and
the time and method of giving the same, shall be conclusive evidence of the
statements therein contained.  (Del. Code Ann., tit. 8, Section 222)

          (e) Time Notices Deemed Given.  All notices given by mail, as above
provided, shall be deemed to have been given as at the time of mailing and all
notices given by telegram shall be deemed to have been given as at the sending
time recorded by the telegraph company transmitting the notices.

          (f) Methods of Notice.  It shall not be necessary that the same method
of giving notice be employed in respect of all directors, but one permissible
method may be employed in respect of any one or more, and any other permissible
method or methods may be employed in respect of any other or others.

          (g) Failure to Receive Notice.  The period or limitation of time
within which any stockholder may exercise any option or right, or enjoy any
privilege or benefit, or be required to act, or within which any director may
exercise any power or right, or enjoy any privilege, pursuant to any notice sent
him in the manner above provided, shall not be affected or extended in any
manner by the failure of such stockholder or such director to receive such
notice.

          (h) Notice to Person with Whom Communication Is Unlawful.  Whenever
notice is required to be given, under any provision of law or of the Certificate
of Incorporation or Bylaws of the corporation, to any person with whom
communication is unlawful, the giving of such notice to such person shall not be
required and there shall be no duty to apply to any governmental authority or
agency for a license or permit to give such notice to such person. Any action or
meeting which shall be taken or held without notice to any such person with whom
communication is unlawful shall have the same force and effect as if such notice
had been duly given.  In the event that the action taken by the
<PAGE>
 
corporation is such as to require the filing of a certificate under any
provision of the Delaware General Corporation Law, the certificate shall state,
if such is the fact and if notice is required, that notice was given to all
persons entitled to receive notice except such persons with whom communication
is unlawful.  (Del. Code Ann., tit. 8, Section 230)

                                  ARTICLE XIII

                                   Amendments

     Section 47.   Amendments.  These Bylaws may be repealed, altered or amended
or new Bylaws adopted by the stockholders.  The Board of Directors also shall
have the authority, if such authority is conferred upon the Board of Directors
by the Certificate of Incorporation, to repeal, alter or amend these Bylaws or
adopt new Bylaws (including, without limitation, the amendment of any Bylaw
setting forth the number of directors who shall constitute the whole Board of
Directors) subject to the power of the stockholders to change or repeal such
Bylaws and provided that the Board of Directors shall not make or alter any
Bylaws fixing the qualifications, classifications, term of office or
compensation of directors.  (Del. Code Ann., tit. 8, Sections 109(a), 122(6))

                                  ARTICLE XIV

                          Loans of Officers and Others

     Section 48.    Certain Corporate Loans and Guaranties.  The corporation may
make loans of money or property to, or guarantee the obligations of, or
otherwise assist any officer or other employee who is a director of the
corporation or its parent or any subsidiary, or adopt an employee benefit plan
or plans authorizing such loans or guaranties, upon the approval of the Board of
Directors alone if the Board of Directors determines that such a loan or
guaranty or plan may reasonably be expected to benefit the corporation.

<PAGE>
 
                                                                   EXHIBIT 10.21

================================================================================

                                CREDIT AGREEMENT

                            Dated as of May 28, 1998

                                     among

                                  Amgen Inc.,

                    The Borrowing Subsidiaries Herein Named,

                            The Banks Herein Named,

                                      and

                              Citicorp USA, Inc.,
                            as Administrative Agent

================================================================================

                                   Arranger:
                           Citicorp Securities, Inc.
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                                      Page
     <S>                                                              <C>
                                   ARTICLE 1
                      DEFINITIONS AND ACCOUNTING TERMS................  1
                      --------------------------------
     1.1   Defined Terms..............................................  1
           -------------
     1.2   Use of Defined Terms....................................... 18
           --------------------
     1.3   Accounting Terms........................................... 18
           ----------------
     1.4   Rounding................................................... 19
           --------
     1.5   Exhibits and Schedules..................................... 19
           ----------------------
     1.6   References to "the Company and its Subsidiaries"........... 19
           -----------------------------------------------
     1.7   Miscellaneous Terms........................................ 19
           -------------------

                                   ARTICLE 2
                          LOANS AND LETTERS OF CREDIT................. 19
                          ---------------------------
     2.1   Committed Advances - General............................... 19
           ----------------------------
     2.2   Base Rate Loans............................................ 21
           ---------------
     2.3   Eurodollar Rate Loans...................................... 21
           ---------------------
     2.4   Competitive Advances....................................... 21
           --------------------
     2.5   Voluntary Reduction of Commitment.......................... 24
           ---------------------------------
     2.6   Letters of Credit.......................................... 24
           -----------------
     2.7   Administrative Agent's Right to Assume Funds
           --------------------------------------------
           Available for Advances..................................... 29
           ----------------------
     2.8   Extension of Maturity Date................................. 30
           --------------------------

                                   ARTICLE 3
                               PAYMENTS AND FEES...................... 31
                               -----------------
     3.1   Principal and Interest..................................... 31
           ----------------------
     3.2   Commitment fee............................................. 33
           --------------
     3.3   Arranger Fee and Agency Fees............................... 33
           ----------------------------
     3.4   LC Issuance Fee............................................ 33
           ---------------
     3.5   LC Reimbursement Fee....................................... 33
           --------------------
     3.6   LC Drawing Fee............................................. 33
           --------------
     3.7   Capital Adequacy........................................... 33
           ----------------
     3.8   Increased Costs............................................ 34
           ---------------
     3.9   Late Payments.............................................. 37
           -------------
     3.10  Computation of Interest and Fees........................... 38
           --------------------------------
     3.11  Non-Banking Days........................................... 38
           ----------------
     3.12  Manner and Treatment of Payments........................... 38
           --------------------------------
     3.13  Funding Sources............................................ 40
           ---------------
     3.14  Failure to Charge Not Subsequent Waiver.................... 40
           ---------------------------------------
     3.15  Administrative Agent's Right to Assume Payments
           -----------------------------------------------
           Will be Made by Borrower................................... 40
           ------------------------
     3.16  Fee Determination Detail................................... 41
           ------------------------
     3.17  Letter of Credit Illegality................................ 41
           ---------------------------
     3.18  Survivability.............................................. 41
           -------------

                                   ARTICLE 4
                       RERESENTATIONS AND WARRANTIES.................. 42
                       -----------------------------
     4.1   Existence and Qualification; Power; Compliance
           ----------------------------------------------
           with Laws.................................................. 42
           ---------
</TABLE>

                                       i
<PAGE>
 
<TABLE>
<S>                                                                    <C>
     4.2  Authority; Compliance With Other Agreements
          -------------------------------------------
          and Instruments and Government Regulations.................. 42
          ------------------------------------------
     4.3  No Governmental Approvals Required.......................... 43
          ----------------------------------
     4.4  Subsidiaries................................................ 43
          ------------
     4.5  Financial Statements........................................ 43
          --------------------
     4.6  No Other Liabilities; No Material Adverse Effect............ 43
          ------------------------------------------------
     4.7  Title to and Location of Property........................... 43
          ---------------------------------
     4.8  Intangible Assets........................................... 44
          -----------------
     4.9  Governmental Regulation..................................... 44
          -----------------------
     4.10 Litigation.................................................. 44
          ----------
     4.11 Binding Obligations......................................... 44
          -------------------
     4.12 No Default.................................................. 44
          ----------
     4.13 Employee Benefit Plans...................................... 45
          ----------------------
     4.14 Regulation U................................................ 45
          ------------
     4.15 Disclosure.................................................. 45
          ----------
     4.16 Tax Liability............................................... 45
          -------------
     4.17 Environmental Matters....................................... 46
          ---------------------

                                   ARTICLE 5
                             AFFIRMATIVE COVENANTS
                             ---------------------
              (OTHER THAN INFORMATION AND REPORTING REQUIREMENTS)..... 46
              ---------------------------------------------------
     5.1  Payment of Taxes and Other Potential Liens.................. 46
          ------------------------------------------
     5.2  Preservation of Existence................................... 47
          -------------------------
     5.3  Maintenance of Properties................................... 47
          -------------------------
     5.4  Maintenance of Insurance.................................... 47
          ------------------------
     5.5  Compliance with Laws........................................ 47
          --------------------
     5.6  Visitation.................................................. 47
          ----------
     5.7  Keeping of Records and Books of Account..................... 48
          ---------------------------------------
     5.8  Compliance With Agreements.................................. 48
          --------------------------
     5.9  Use of Proceeds............................................. 48
          ---------------

                                   ARTICLE 6
                              NEGATIVE COVENANTS...................... 48
                              ------------------
     6.1  Change in Nature of Business................................ 48
          ----------------------------
     6.2  Mergers..................................................... 48
          -------
     6.3  Acquisitions of Securities of the Company................... 49
          -----------------------------------------
     6.4  Distributions............................................... 49
          -------------
     6.5  Leins; Negative Pledges; Sales and Leasebacks............... 49
          ---------------------------------------------
     6.6  Transactions with Affiliates................................ 50
          ----------------------------
     6.7  Interest Charge Coverage Ratio.............................. 50
          ------------------------------
     6.8  Tangible Net Worth.......................................... 50
          ------------------

                                   ARTICLE 7
                     INFORMATION AND REPORTING REQUIREMENTS........... 50
                     --------------------------------------
     7.1  Financial and Business Information.......................... 50
          ----------------------------------
     7.2  Compliance Certificates..................................... 52
          -----------------------

                                   ARTICLE 8
                                  CONDITIONS.......................... 52
                                  ----------
     8.1  Conditions to Effectiveness................................. 52
          ---------------------------
     8.2  Any Increasing Advance and Any Letter of Credit............. 54
          -----------------------------------------------
     8.3  Any Advance................................................. 55
          -----------

                                   ARTICLE 9
</TABLE>

                                       ii
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                        Page
                                                                        ----
<S>                                                                     <C>
             EVENTS OF DEFAULT AND REMEDIES UPON EVENT OF DEFAULT....... 55
             ----------------------------------------------------    
     9.1   Events of Default............................................ 55
           -----------------                                         
     9.2   Remedies Upon Event of Default............................... 58
           ------------------------------                            
                                                                     
                                   ARTICLE 10                        
                           THE ADMINISTRATIVE AGENT..................... 61
                           ------------------------                  
     10.1  Appointment and Authorization................................ 61
           -----------------------------                             
     10.2  Administrative Agent and Affiliates.......................... 61
           -----------------------------------                       
     10.3  Proportionate Interest of the Banks in any                
           ------------------------------------------                
           Collateral................................................... 61
           ----------                                                
     10.4  Banks' Credit Decisions...................................... 62
           -----------------------                                   
     10.5  Action by the Administrative Agent........................... 62
           ----------------------------------                        
     10.6  Liability of the Administrative Agent........................ 63
           -------------------------------------                     
     10.7  Indemnification.............................................. 64
           ---------------                                           
     10.8  Successor Administrative Agent............................... 65
           ------------------------------                            
     10.9  No Obiligations of Borrowers................................. 66
           ----------------------------                               
     10.10 Arranger..................................................... 66
           --------


                                  ARTICLE 11
                               COMPANY GUARANTY......................... 66
                               ----------------
     11.1  The Guaranty................................................. 66
           ------------
     11.2  Guaranty Unconditional....................................... 67
           ----------------------
     11.3  Discharge Only Upon Payment in Full;
           ------------------------------------
           Reinstatement in Certain Cercumstances....................... 68
           --------------------------------------
     11.4  Waivers by the Company....................................... 69
           ----------------------
     11.5  Subrogation, Etc............................................. 70
           -----------------

                                  ARTICLE 12
               ADDITIONAL BORROWERS; TERMINATION OF BORROWERS........... 71
               ----------------------------------------------
     12.1  Agreement to Participate..................................... 71
           ------------------------
     12.2  Notice of Termination........................................ 72
           ---------------------

                                  ARTICLE 13
                                 MISCELLANEOUS.......................... 72
                                 -------------
     13.1  Cumulative Remedies; No Waiver............................... 72
           ------------------------------
     13.2  Amendments; Consents......................................... 72
           --------------------
     13.3  Costs, Expenses and Taxes.................................... 73
           -------------------------
     13.4  Nature of Banks' Obligations................................. 74
           ----------------------------
     13.5  Survival..................................................... 75
           --------
     13.6  Notices...................................................... 75
           -------
     13.7  Execution of Loan Documents.................................. 75
           ---------------------------
     13.8  Binding Effect; Assignement.................................. 76
           ---------------------------
     13.9  Setoff Rights................................................ 77
           -------------
     13.10 Sharing of Setoffs........................................... 77
           ------------------
     13.11 Indemnity by the Company..................................... 78
           ------------------------
     13.12 Nonliability of the Banks.................................... 80
           -------------------------
     13.13 No Third Parties Benefited................................... 81
           --------------------------
     13.14 Confidentiality.............................................. 81
           ---------------
</TABLE>

                                      iii
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                         Page
                                                                         ----
<S>                                                                      <C>
     13.15 Further Assurances............................................ 81
           ------------------
     13.16 Removal of Bank............................................... 81
           ---------------
     13.17 Integration................................................... 82
           -----------
     13.18 Severabiltiy of Provisions.................................... 82
           --------------------------
     13.19 Independent Covenants......................................... 82
           ---------------------
     13.20 Headings...................................................... 82
           --------
     13.21 Time of the Essence........................................... 82
           -------------------
     13.22 Applicable Law................................................ 83
           --------------
     13.23 Consent to Jurisdiciton and Service of Process................ 83
           ----------------------------------------------
     13.24 Waiver of Jury Trial.......................................... 83
           --------------------
</TABLE>

Exhibits
A    - Agreement to Participate
B    - Committed Advance Note
C    - Competitive Advance Note
D    - Competitive Bid
E    - Competitive Bid Request
F    - Compliance Certificate
G-1  - Opinion of General Counsel of the Company
G-2  - Opinion of O'Melveny & Myers, LLP
H    - Request for Letter of Credit
I    - Request for Loan
J    - Assignment Agreement


Schedules
1.1    Borrowing Subsidiaries     
1.2    Eligible Subsidiaries      
2.1    Bank Commitments           
4.4    Subsidiaries               
4.8    Litigation                 
4.15   Environmental             
6.5    Liens                      

                                       iv
<PAGE>
 
                               CREDIT AGREEMENT
                               ----------------

                           Dated as of May 28, 1998

    This CREDIT AGREEMENT ("Agreement") is dated as of May 28, 1998 and is
                            ---------
entered into by and among Amgen Inc., a Delaware corporation (the "Company"),
                                                                   -------
each of the Borrowing Subsidiaries listed on Schedule 1.1 hereto, Citicorp USA,
                                             ------------
Inc. and each other financial institution whose name is set forth on the
signature pages hereof as a Bank (collectively, the "Banks" and individually, a
                                                     -----
"Bank"), Citibank, N.A., as Issuing Bank and Citicorp USA, Inc., as
 ----
Administrative Agent. In consideration of the mutual covenants and agreements
herein contained, the parties hereto covenant and agree as follows:

                                   ARTICLE 1
                        DEFINITIONS AND ACCOUNTING TERMS
                        --------------------------------

    1.1  Defined Terms.  As used in this Agreement, the following terms shall
         -------------
have the meanings set forth below:

    "Adjusted Net Income" means, with regard to any fiscal period, Net Income
     -------------------
for that fiscal period (a) plus any extraordinary losses sustained by the
                           ----
Company and its Subsidiaries during that period, (b) minus any extraordinary
                                                     -----
gains realized by the Company and its Subsidiaries during that period.

    "Administrative Agent" means CUSA, when acting in its capacity as the
     --------------------
administrative agent under any of the Loan Documents.

    "Administrative Agent's Office" means the Administrative Agent's address as
     -----------------------------
set forth on the signature pages of this Agreement, or such other address as the
Administrative Agent hereafter may designate by written notice to the Company
and the Banks.

    "Advance" means any Advance made or to be made by any Bank to any Borrower
     -------
as provided in Article 2, and includes each Base Rate Advance, each Eurodollar
               ---------      --------
Rate Advance and each Competitive Advance.

    "Affiliate" means, as to any Person, any other Person which directly or
     ---------
indirectly controls, or is under common control with, or is controlled by, such
Person.  As used in this definition, "control" (and the correlative terms,
"controlled by" and "under common control with") shall mean possession, directly
or indirectly, of power to direct or cause the direction of management or
policies (whether through ownership of securities or partnership or other
ownership interests, by contract or otherwise).

                                       1
<PAGE>
 
    "Agreement" means this Credit Agreement, either as originally executed or as
     ---------
it may from time to time be supplemented, modified, amended, restated or
extended in accordance with Section 13.2.
                           
    "Agreement to Participate" means an Agreement to Participate, substantially
     ------------------------
in the form of Exhibit A.
               ---------

    "Anniversary Date" has the meaning set forth in Section 2.9.
     ----------------

    "Applicable Percentage" means, with respect to Eurodollar Rate Loans, the
     ---------------------
Commitment Fee and the LC Reimbursement Fee, the per annum percentage
corresponding to the tier for the Company's Ratings as specified in the
following table:

                             Rate Spread and Fees
                             --------------------
<TABLE>
<CAPTION>
                                            Tier I          Tier II         Tier III           Tier IV
                                            ------          -------         --------           -------
                                          AA- and Aa3    A- and A3 or     BBB and Baa2      BBB- or Baa3
                                           or better        better          or better
<S>                                      <C>             <C>             <C>               <C>
Eurodollar Rate Spread                       .200%           .250%             .375%             .550%

Commitment Fee                               .070%           .080%             .130%             .175%

LC Reimbursement Fee                         .200%           .250%             .375%             .550%
</TABLE>

    Ratings indicated are the Company's senior unsecured long-term debt ratings
by Standard & Poor's Ratings Group and Moody's Investors Service, Inc.,
respectively.

    "Arranger" means Citicorp Securities, Inc., in its capacity as arranger.
     --------

    "Assignment Agreement" means an Assignment Agreement in substantially the
     --------------------
form of Exhibit J, executed by a Bank and an assignee of all or part of that
        ---------
Bank's interest hereunder.

    "Bank" has the meaning set forth in the introductory paragraph.
     ----

    "Banking Day" means any Monday, Tuesday, Wednesday, Thursday or Friday,
     -----------
other than a day on which banks are authorized or required to be closed in
- ----------
California or New York.

    "Base Rate", for any day, means the higher of (i) the rate of interest in
     ---------
effect on such day as publicly announced by Citibank, N.A. from time to time as
its base commercial lending rate (such base rate is not intended to be the
lowest rate of 

                                       2
<PAGE>
 
interest charged by Citibank, N.A.) and (ii) the sum of 0.50% per annum and the
rate of interest determined by the Administrative Agent to be the average
overnight federal funds rate.

    "Base Rate Advance" means an Advance made hereunder that bears interest as
     -----------------
set forth in Section 3.1(b) and designated as a Base Rate Advance in accordance
with Article 2.
     ---------

    "Base Rate Loan" means a Loan made hereunder that bears interest as set
     --------------
forth in Section 3.1(b) and designated as a Base Rate Loan in accordance with
Article 2.
- ---------

    "Borrower" means the Company and any Borrowing Subsidiary; "Borrowers" means
     --------                                                   ---------
the Company and each other Borrower, collectively.

    "Borrowing Subsidiary" means any of the Subsidiaries of Borrower identified
     --------------------
on Schedule 1.1 hereto and any Eligible Subsidiary that is a party to this
   ------------
Agreement as of the date hereof or any Eligible Subsidiary that has executed an
Agreement to Participate pursuant to Section 12.1.

    "Capital Lease" means, as to any Person, a lease of any Property by that
     -------------
Person as lessee that is, or should be in accordance with Financial Accounting
Standards Board Statement No. 13, recorded as a "capital lease" on the balance
sheet of that Person prepared in accordance with Generally Accepted Accounting
Principles.

    "Cash" means, when used in connection with any Person, all monetary and non-
     ----
monetary items owned by that Person that are treated as cash in accordance with
Generally Accepted Accounting Principles, except for amounts held by, or on
                                          ------
deposit with, another Person as cash collateral or other security.

    "Certificate of a Senior Officer" means a certificate signed by a Senior
     -------------------------------
Officer of the Person providing the certificate.

    "Closing Date" means the time and Banking Day on which the conditions set
     ------------
forth in Section 8.1 are satisfied, which date shall occur on or before May 31,
         -----------
1998.

    "Code" means the Internal Revenue Code of 1986, as amended or replaced and
     ----
as in effect from time to time.

    "Commitment" means the aggregate commitment of the Banks (i) to make
     ----------
Committed Advances pursuant to Section 2.1(a) in an aggregate principal amount
                               -------------
up to $150,000,000 and (ii) to purchase an undivided interest in any Letters of
Credit issued pursuant to Section 2.7(a)(2), as such Commitment may be reduced
                          -----------------
in accordance with Section 2.5. The respective Pro Rata Shares of the Banks with
respect to the Commitments are set forth in Schedule 2.1.
                                            ------------

                                       3
<PAGE>
 
    "Committed Advance" means an Advance made to any Borrower by any Bank in
     -----------------
accordance with such Bank's Pro Rata Share of the Commitment pursuant to Section
                                                                         -------
2.1.
- ---

    "Committed Advance Note" means any of the promissory notes made by the
     ----------------------
Borrowers in favor of a Bank to evidence revolving Committed Advances made by
that Bank under the Commitment, substantially in the form of Exhibit B, as
                                                             ---------
originally executed or as the same may from time to time be supplemented,
modified, amended, renewed or extended.

    "Common Stock" means the $.0001 par value common stock of the Company.
     ------------
"Company" has the meaning set forth in the introductory paragraph.
"Competitive Advance" means an Advance made to any Borrower by any Bank not in
accordance with that Bank's Pro Rata Share of the Commitment pursuant to Section
                                                                         -------
2.4.
- ---

    "Competitive Advance Note" means any of the promissory notes made by a
     ------------------------
Borrower in favor of a Bank to evidence Competitive Advances made by that Bank,
substantially in the form of Exhibit C, either as originally executed or as the
                             ---------
same may from time to time be supplemented, modified, amended, renewed or
extended.

    "Competitive Bid" means a written bid to provide a Competitive Advance
     ---------------
substantially in the form of Exhibit D, signed by a Responsible Official of a
                             ---------
Bank and properly completed to provide all information required to be included
therein.

    "Competitive Bid Request" means (a) a written request submitted by a
     -----------------------
Borrower to one or more of the Banks to provide a Competitive Bid, substantially
in the form of Exhibit E, signed by a Senior Officer and properly completed to
               ---------
provide all information required to be included therein or (b), at the election
of such Borrower, a telephonic request by such Borrower to the Administrative
Agent for one or more of the Banks to provide a Competitive Bid which, if so
made, shall be made by an Assistant Treasurer or Senior Officer of such Borrower
and shall include the substance of Exhibit E and shall be promptly confirmed in
                                   ---------
writing by a Senior Officer of such Borrower.

    "Compliance Certificate" means a certificate in the form of Exhibit F,
     ----------------------                                     ---------
properly completed and signed by a Senior Officer of the Company.

    "Consolidated Subsidiary" means, as of any date of determination and with
     -----------------------
respect to any Person, any Subsidiary of that Person whose financial data is, in
accordance with Generally Accepted Accounting Principles, reflected in that
Person's consolidated financial statements.

                                       4
<PAGE>
 
    "Contractual Obligation" means, as to any Person, any provision of any
     ----------------------
outstanding Securities issued by that Person or of any material agreement,
instrument or undertaking to which that Person is a party or by which it or any
of its Property is bound.

    "Convert," "Conversion" and "Converted" each refers to a conversion of
     -------    ----------       ---------
Advances of one Type into Advances of another Type pursuant to Section 2.6.

    "Cross-Default Amount" means, as of any date of determination, an amount
     --------------------
equal to the lesser of (i) $50,000,000 or (ii) 5% of Tangible Net Worth as of
the last day of the then most recently ended Fiscal Quarter with respect to
which the Company has delivered the financial statements required by Section
                                                                     -------
7.1(a) or, if the Company is delinquent in the delivery of such financial
- ------
statements with respect to the most recently ended Fiscal Quarter, 5% of
Tangible Net Worth as reasonably determined by the Administrative Agent.

    "Current ERISA Affiliate", as applied to any Person, means (i) any
     -----------------------
corporation which is a member of a controlled group of corporations within the
meaning of Section 414(b) of the Code of which that Person is a member; (ii) any
trade or business (whether or not incorporated) which is a member of a group of
trades or businesses under common control within the meaning of Section 414(c)
of the Code of which that Person is a member; and (iii) any member of an
affiliated service group within the meaning of Section 414(m) or (o) of the Code
of which that Person, any corporation described in clause (i) above or any trade
or business described in clause (ii) above is a member.

    "CUSA" means Citicorp USA, Inc.
     ----

    "Debtor Relief Laws" means the Bankruptcy Code of the United States of
     ------------------
America, as amended from time to time, and all other applicable liquidation,
conservatorship, bankruptcy, moratorium, rearrangement, receivership,
insolvency, reorganization, or similar debtor relief Laws from time to time in
effect affecting the rights of creditors generally.

    "Default" means any Event of Default or any event that, with the giving of
     -------
any applicable notice or passage of time specified in Section 9.1, or both,
                                                      -----------
would be an Event of Default.

    "Default Rate" means the interest rate described in Section 3.9.
     ------------                                       -----------
"Designated Deposit Account" means a deposit account designated by a Borrower in
its Request for Loan submitted with respect to each Loan.

    "Distribution" means, with respect to any shares of capital stock or any
     ------------
warrant or right to acquire shares of 

                                       5
<PAGE>
 
capital stock or any other equity security issued by a Person, (a) the
retirement, redemption, purchase, or other acquisition for value (other than for
common stock of such Person) by such Person of any such security, (b) the
declaration or (without duplication) payment by such Person of any dividend in
cash or in Property (other than in common stock of such Person) on or with
respect to any such security, (c) any Investment by such Person in the holder of
any such security where such Investment is made in lieu of, or to avoid
characterization as, a Distribution described in clauses (a) or (b) above, and
(d) any other payment by such Person constituting a distribution under
applicable laws with respect to such security. Notwithstanding the foregoing,
"Distribution" shall not include a repurchase by the Company of its Common
Stock.

    "dollars" or "$" means United States dollars.
     -------      -

    "Eligible Subsidiary" means any of the wholly-owned Subsidiaries of the
     -------------------
Company listed on Schedule 1.2.
                  ------------       

    "Employee Benefit Plan" means any "employee benefit plan" as defined in
     ---------------------
Section 3(3) of ERISA which is, or was at any time, maintained or contributed to
by the Company or any of its ERISA Affiliates.

    "Environmental Laws" means all plans, policies or decrees binding on the
     ------------------
Company and its Subsidiaries in accordance with applicable statutes, ordinances,
orders, rules or regulations and all statutes, ordinances, orders, rules or
regulations and the like, in each case, relating to (i) environmental matters,
including, without limitation, those relating to fines, injunctions, penalties,
damages, contribution, cost recovery compensation, losses or injuries resulting
from the release or threatened release of hazardous materials, (ii) the
generation, use, storage, transportation or disposal of hazardous materials, or
(iii) occupational safety and health, industrial hygiene, land use or the
protection of human, plant or animal health or welfare, in any manner applicable
to the Company or any of its Subsidiaries or any of their respective properties,
including, without limitation, the Comprehensive Environmental Response,
Compensation, and Liability Act (42 U.S.C. (S) 9601 et seq.), the Hazardous
                                                    ------ 
Materials Transportation Act (49 U.S.C. (S) 1801 et seq.), the Resource
                                                 ------
Conservation and Recovery Act (42 U.S.C. (S) 6901 et seq.), the Federal Water
                                                  ------
Pollution Control Act (33 U.S.C. (S) 1251 et seq.), the Clean Air Act (42 U.S.C.
                                          ------
(S) 7401 et seq.), the Toxic Substances Control Act (15 U.S.C. (S) 2601 et
         ------                                                         --
seq.), the Federal Insecticide, Fungicide and Rodenticide Act (7 U.S.C. (S)136
- ---
et seq.), the Occupational Safety and Health Act (29 U.S.C. (S) 651 et seq.) and
- ------                                                              ------
et seq.), each as amended or supplemented, and any analogous future or present
- ------
local, state and federal statutes and regulations promulgated pursuant thereto,
each as in effect as of the date of determination.

                                       6
<PAGE>
 
     "ERISA" means the Employee Retirement Income Security Act of 1974, and any
      -----
regulations issued pursuant thereto, as amended or replaced and as in effect
from time to time.

     "ERISA Affiliate", as applied to any Person, means (i) any corporation
      ---------------
which is, or was at any time, a member of a controlled group of corporations
within the meaning of Section 414(b) of the Code of which that Person is, or was
at any time, a member; (ii) any trade or business (whether or not incorporated)
which is, or was at any time, a member of a group of trades or businesses under
common control within the meaning of Section 414(c) of the Code of which that
Person is, or was at any time, a member; and (iii) any member of an affiliated
service group within the meaning of Section 414(m) or (o) of the Code of which
that Person, any corporation described in clause (i) above or any trade or
business described in clause (ii) above is, or was at any time, a member.

     "ERISA Event" means (i) a "reportable event" within the meaning of Section
      -----------
4043 of ERISA and the regulations issued thereunder with respect to any Pension
Plan (excluding those for which the provision for 30-day notice to the PBGC, or
the penalty for failure to provide such notice, has been waived by regulation or
by PBGC technical update); (ii) the failure to meet the minimum funding standard
of Section 412 of the Code with respect to any Pension Plan (whether or not
waived in accordance with Section 412(d) of the Code) or the failure to make by
its due date a required installment under Section 412(m) of the Code with
respect to any Pension Plan or the failure to make any required contribution to
a Multiemployer Plan; (iii) the provision by the administrator of any Pension
Plan pursuant to Section 4041(a)(2) of ERISA of a notice of intent to terminate
such plan in a distress termination described in Section 4041(c) of ERISA; (iv)
the withdrawal by the Company or any of its ERISA Affiliates from any Pension
Plan with two or more contributing sponsors or the termination of any such
Pension Plan resulting in liability pursuant to Sections 4063 or 4064 of ERISA;
(v) the institution by the PBGC of proceedings to terminate any Pension Plan, or
the occurrence of any event or condition which might constitute grounds under
ERISA for the termination of, or the appointment of a trustee to administer, any
Pension Plan; (vi) the imposition of liability on the Company or any of its
ERISA Affiliates pursuant to Section 4062(e) or 4069 of ERISA or by reason of
the application of Section 4212(c) of ERISA; (vii) the withdrawal by the Company
or any of its ERISA Affiliates in a complete or partial withdrawal (within the
meaning of Sections 4203 and 4205 of ERISA) from any Multiemployer Plan if there
is any potential liability therefor, or the receipt by the Company or any of its
ERISA Affiliates of notice from any Multiemployer Plan that it is in
reorganization or insolvency pursuant to Section 4241 or 4245 of ERISA, or that
it intends to terminate or has terminated under Section 4041A or 4042 of ERISA;
(viii) the occurrence of an act or omission which could give rise to the
imposition on the Company or any of its ERISA Affiliates of fines, penalties,
taxes 

                                       7
<PAGE>
 
or related charges under Chapter 43 of the Code or under Section 409 or 502(c),
(i) or (l) or 4071 of ERISA in respect of any Employee Benefit Plan; (ix) the
assertion of a material claim (other than routine claims for benefits) against
any Employee Benefit Plan other than a Multiemployer Plan or the assets thereof,
or against Company or any of its ERISA Affiliates in connection with any such
Employee Benefit Plan; (x) receipt from the Internal Revenue Service of notice
of the failure of any Pension Plan (or any other Employee Benefit Plan intended
to be qualified under Section 401(a) of the Code) to qualify under Section
401(a) of the Code, or the failure of any trust forming part of any Pension Plan
to qualify for exemption from taxation under Section 501(a) of the Code; or (xi)
the imposition of a Lien pursuant to Section 401(a)(29) or 412(n) of the Code or
pursuant to ERISA with respect to any Pension Plan.

     "Eurodollar Banking Day" means any Banking Day on which dealings in dollar
      ----------------------
deposits are conducted by and among banks in the Eurodollar Market.

     "Eurodollar Lending Office" means, as to each Bank, its office or branch so
      -------------------------
designated by written notice to the Company and the Administrative Agent as its
Eurodollar Lending Office.  If no Eurodollar Lending Office is designated by a
Bank, its Eurodollar Lending Office shall be its office at its address for
purposes of notices hereunder.

     "Eurodollar Market" means, with respect to any Eurodollar Rate Loan, the
      -----------------
London interbank offer market for U.S. dollar deposits.

     "Eurodollar Obligations" means eurocurrency liabilities, as defined in
      ----------------------
Regulation D.

     "Eurodollar Period" means, as to each Eurodollar Rate Loan, the period
      ----------------- 
commencing on the date specified by the Borrower pursuant to Section 2.1(b) and
                                                             --------------
ending 1, 2, 3 or 6 months thereafter or, if available in the judgment of the
Reference Banks, 9 or 12 months thereafter, as specified by the Borrower in the
applicable Request for Loan; provided that:
                             --------

          (a) The first day of any Eurodollar Period shall be a Eurodollar
              Banking Day;

          (b) Any Eurodollar Period that would otherwise end on a day that is
              not a Eurodollar Banking Day shall be extended to the next
              succeeding Eurodollar Banking Day unless such Eurodollar Banking
              Day falls in another calendar month, in which case such Eurodollar
              Period shall end on the next preceding Eurodollar Banking Day; and

          (c) No Eurodollar Period shall extend beyond the Maturity Date.

                                       8
<PAGE>
 
     "Eurodollar Rate" means, with respect to any Eurodollar Rate Loan, the
      ---------------
average interest rate per annum (determined solely by the Administrative Agent
and rounded upward to the next 1/100 of 1%) at which deposits in dollars are
offered to prime banks by the Reference Banks in the Eurodollar Market at or
about 10:00 a.m. London time, two (2) Eurodollar Banking Days before the first
day of the applicable Eurodollar Period in an aggregate amount approximately
equal to the amount of the Eurodollar Rate Loan to be made by such Reference
Bank and for a period of time comparable to the number of days in the applicable
Eurodollar Period; provided that, if one Reference Bank is unable to provide its
                   --------
offered quotation to the Administrative Agent, the Eurodollar Rate shall be
determined on the basis of the rates quoted by the remaining Reference Banks.
The determination of the Eurodollar Rate by the Administrative Agent shall be
conclusive in the absence of manifest error.

     "Eurodollar Rate Advance" means an Advance made hereunder that bears
      -----------------------
interest as set forth in Section 3.1(c) and designated as a Eurodollar Rate
Advance in accordance with Article 2.
                           ---------

     "Eurodollar Rate Loan" means a Loan made hereunder that bears interest as
      --------------------
set forth in Section 3.1(c) and designated as a Eurodollar Rate Loan in
accordance with Article 2.
                ---------

     "Eurodollar Reserve Percentage" means, with respect to any Eurodollar Rate
      ----------------------------- 
Loan, the percentage applicable as of the date of determination of the
Eurodollar Rate representing the aggregate reserve requirements of any Bank
(disregarding any offsetting amounts that may be available to such Bank to
decrease such requirements to the extent that such offsetting amounts arose out
of transactions other than those contemplated by this Agreement) under
Regulation D and any other applicable Laws with respect to Eurodollar
Obligations in an aggregate amount equal to the amount of such Bank's Pro Rata
Share of such Eurodollar Rate Loan and for a time period comparable to the
number of months in the applicable Eurodollar Period. The determination by any
Bank of any applicable Eurodollar Reserve Percentage shall be presumed correct
in the absence of manifest error.

     "Event of Default" shall have the meaning provided in Section 9.1.
      ----------------                                     -----------

     "Existing Loan Documents" means the loan documents executed in connection
      -----------------------
with that certain Credit Agreement dated as of June 23, 1995, as amended,
between the Company, the borrowing subsidiaries therein named, the lenders
therein named, Swiss Bank Corporation, New York Branch, as issuing bank and
Swiss Bank Corporation, New York Branch and Citicorp USA, Inc., as co-agents for
themselves and such lenders.

                                       9
<PAGE>
 
     "Fiscal Quarter" means the fiscal quarter of the Company consisting of a
      --------------
three month fiscal period ending on each March 31, June 30, September 30 and
December 31.

     "Fiscal Year" means the fiscal year of the Company consisting of a twelve
      -----------
month fiscal period ending on each December 31.

     "Generally Accepted Accounting Principles" means, as of any date of
      ----------------------------------------
determination, accounting principles set forth as "generally accepted" in then
currently effective Statements of the Auditing Standards Board of the American
Institute of Certified Public Accountants, or, if no such Statements are then in
effect, that are then approved by such other entity as may be approved by a
significant segment of the accounting profession in the United States of
America.  The term "Generally Accepted Accounting Principles" shall be read in
                    ----------------------------------------
each instance as if the words "consistently applied" followed immediately
                               --------------------
thereafter, meaning that the accounting principles applied are consistent in all
material respects (except for changes concurred in by the Company's independent
public accountants) to those applied at prior dates or for prior periods.

     "Governmental Agency" means (a) any foreign, federal, state, county or
      -------------------
municipal government, or political subdivision thereof, (b) any governmental or
quasi-governmental agency, authority, board, bureau, commission, department,
instrumentality or public body, (c) any court or administrative tribunal or (d)
with respect to any Person, any arbitration tribunal or other nongovernmental
authority to whose jurisdiction that Person has consented.

     "Hostile Acquisition" means the acquisition of capital stock or other
      -------------------
equity interests of a Person (the "Target") through a tender offer or similar
solicitation of the owners of such capital stock or other equity interests which
has not been approved (prior to such acquisition) by resolutions of the Board of
Directors of the Target or by similar action if the Target is not a corporation
and as to which such approval has not been withdrawn.

     "Indebtedness" means, as to any Person, (a) all indebtedness of such Person
      ------------
for borrowed money, (b) that portion of the obligations of such Person under
Capital Leases which is properly recorded as a liability on a balance sheet of
that Person prepared in accordance with Generally Accepted Accounting
Principles, (c) to the extent of the outstanding Indebtedness thereunder, any
obligation of such Person that is evidenced by a promissory note or other
instrument representing an extension of credit to such Person, whether or not
for borrowed money, (d) any obligation of such Person for the deferred purchase
price of Property or services (other than trade or other accounts payable in the
                               ----------
ordinary course of business), (e) any obligation of such Person of the nature
described in clauses (a), (b), (c) or (d) 
                     ---  ---  ---    ---

                                       10
<PAGE>
 
above that is secured by a Lien on assets of such Person, whether or not that
Person has assumed such obligation or whether or not such obligation is non-
recourse to the credit of such Person, but only to the extent of the lesser of
the face amount of the obligation or the fair market value of the assets so
subject to the Lien, (f) obligations of such Person arising under acceptance
facilities or under facilities for the discount of accounts receivable of such
Person, (g) any obligation of such Person to reimburse the issuer of any letter
of credit issued for the account of such Person upon which and only to the
extent a draw has been made and (h) in the case of the Company, any obligations
of the Company under a Swap Agreement. As of any date of determination, the
amount of the Company's Indebtedness pursuant to any Swap Agreement shall be
equal to 1% of the notional amount of that Swap Agreement times the number of
                                                          -----
years then remaining in the term of that Swap Agreement.

     "Intangible Assets" means assets that are considered intangible assets
      ----------------- 
under Generally Accepted Accounting Principles, including customer lists,
                                                ---------
goodwill, computer software, copyrights, trade names, trademarks, patents,
unamortized deferred charges, unamortized debt discount, capitalized research
and development costs and other intangible assets.

     "Interest Charges" means, as of the last day of any fiscal period, the sum
      ----------------                                                      ---
of (a) all interest, fees, charges and related expenses paid or payable (without
- --
duplication) for that fiscal period to a lender in connection with borrowed
money or the deferred purchase price of assets that is treated as interest in
accordance with Generally Accepted Accounting Principles excluding interest paid
or payable (without duplication) for that fiscal period on any intercompany
loans, plus (b) the portion of rent paid or payable (without duplication) for
       ----
that fiscal period under Capital Leases that should be treated as interest in
accordance with Generally Accepted Accounting Principles.

     "Interest Charge Coverage Ratio" means, as of the last day of any Fiscal
      ------------------------------
Quarter, the ratio of (a) Adjusted Net Income for the fiscal period consisting
of that Fiscal Quarter and the three immediately preceding Fiscal Quarters plus
                                                                           ----
(i) Interest Charges of the Company and its Consolidated Subsidiaries for such
fiscal period, plus (ii) depreciation and amortization expense of the Company
               ----
and its Consolidated Subsidiaries for such fiscal period, plus (iii) provisions
                                                          ----
for taxes based on income of the Company and its Consolidated Subsidiaries for
such fiscal period, to (b) Interest Charges of the Company and its Consolidated
Subsidiaries for such fiscal period.

     "Interest Period" means with respect to any Eurodollar Rate Loan, the
      ---------------
related Eurodollar Period.

     "Investment" means, when used in connection with any Person, any investment
      ----------
by or of that Person, whether by means of purchase or other acquisition of
capital stock or other 

                                       11
<PAGE>
 
Securities of any other Person or by means of loan, advance, capital
contribution, guaranty or other debt or equity participation or interest, or
otherwise, in any other Person, including any partnership and joint venture
                                --------- 
interests of such Person in any other Person. "Investment" shall include (a) a
repurchase by the Company of its Common Stock, (b) all payments by the Company
or any Subsidiary to any Person as a buyout of royalty obligations to that
Person and (c) all acquisitions by the Company or any Subsidiary of technology
and/or distribution rights. The amount of any Investment shall be the amount
actually invested, without adjustment for subsequent increases or decreases in
the value of such Investment.

     "Issuing Bank" means Citibank, N.A.
      ------------

     "Laws" means, collectively, all foreign, federal, state and local statutes,
      ----  
treaties, rules, regulations, ordinances, codes and administrative or
controlling precedents of any Governmental Agency.

     "LC Issuance Fee" means a fee payable to the Issuing Bank as provided in
      ---------------
Section 3.4. 
- -----------

     "LC Reimbursement Fee" means a fee payable to the Administrative Agent, for
      --------------------
the pro rata benefit of the Banks, as provided in Section 3.5.
                                                  -----------
     "Letters of Credit" means any letters of credit issued by the Issuing Bank
      -----------------
pursuant to Section 2.7(a), either as originally executed or as the same may
from time to time be supplemented, modified, reviewed, extended or supplanted.

     "Lien" means any mortgage, deed of trust, pledge, hypothecation, assignment
      ----
for security, security interest, encumbrance, lien or charge of any kind,
whether voluntarily incurred or arising by operation of Law or otherwise,
affecting any Property, including any agreement to grant any of the foregoing,
                        ---------
any conditional sale or other title retention agreement, any lease in the nature
of a security interest, and/or the filing of or agreement to give any financing
statement (other than a precautionary financing statement with respect to a
           ----------
lease that is not in the nature of a security interest) under the Uniform
Commercial Code or comparable Law of any jurisdiction with respect to any
Property.

     "Loan" means any group of Committed Advances made at any one time by the
      ----
Banks pursuant to Article 2.
                  ---------   

     "Loan Documents" means, collectively, this Agreement, the Notes, any
      --------------
Request for Loan, any Agreement to Participate, any Letter of Credit, any
Request for Letter of Credit, any Competitive Bid Request and any other
certificates or agreements heretofore or hereafter executed by a Senior Officer
of any Borrower in connection with this Agreement and delivered by any 

                                       12
<PAGE>
 
Borrower to the Administrative Agent, an Issuing Bank or any Bank, in each case
either as originally executed or as the same may from time to time be
supplemented, modified, amended, restated, extended or supplanted.

     "Majority Banks" means, as of any date of determination, Banks whose
      -------------- 
aggregate Pro Rata Shares are at least 51% of the Commitment then in effect or
if the Commitment is not then in effect, Banks to which at least 51% of the
aggregate Total Outstandings is owed.

     "Material Adverse Effect" means a circumstance or set of circumstances or
      -----------------------
events affecting the business, operations or condition (financial or otherwise)
of the Company and its Subsidiaries, taken as a whole that have a material
adverse effect, individually or in the aggregate, upon the ability (i) of the
Company and its Subsidiaries, taken as a whole, to perform under the Loan
Documents or (ii) of any of the Banks to enforce, the Obligations under the Loan
Documents.

     "Maturity Date" means May 28, 2003, unless otherwise extended pursuant to
      -------------
Section 2.9.

     "Multiemployer Plan" means a "multiemployer plan", as defined in Section
      -----------------
3(37) of ERISA, to which the Company or any of its ERISA Affiliates is
contributing, or ever has contributed, or to which the Company or any of its
ERISA Affiliates has, or ever has had, an obligation to contribute.

     "Net Income" means, with respect to any fiscal period, the consolidated net
      ----------
income of the Company and its Subsidiaries for that period, determined in
accordance with Generally Accepted Accounting Principles; provided that there
                                                          --------
shall be excluded from Net Income (i) any income or loss of a Person accrued
prior to the date upon which such Person, or the assets of such Person, was
acquired by or merged into the Company or any of its Subsidiaries; (ii) any
income of a Subsidiary of the Company to the extent that declaration or payment
of dividends or other Distributions by that Subsidiary is not permitted by any
Contractual Obligation or Requirement of Law applicable to that Subsidiary;
(iii) any charges taken in respect of payments to any Person as a buyout of
royalty obligations to that Person; and (iv) any charges taken in connection
with the acquisition of technology and/or distribution rights.

     "Notes" means, collectively, the Committed Advance Notes and the
      -----
Competitive Advance Notes.

     "Notice of Conversion/Continuation" has the meaning specified in Section
      ---------------------------------
2.6.

     "Obligations" means all present and future obligations of every kind or
      -----------
nature of the Borrowers at any time and from time to time owed to the Arranger,
the Administrative Agent, the 

                                       13
<PAGE>
 
Issuing Bank or the Banks or any one or more of them under any one or more of
the Loan Documents, whether due or to become due, matured or unmatured,
liquidated or unliquidated, or contingent or noncontingent, including
                                                            ---------
obligations of performance as well as obligations of payment, and including
                                                                  ---------
interest that accrues after the commencement of any proceeding under any Debtor
Relief Law by or against the Company or any Subsidiary of the Company.

     "Other Taxes" means any present or future stamp or documentary taxes and
      -----------
any other excise or property taxes, or similar charges or levies, which arise
from any payment made pursuant to this Agreement or under any Loan Document or
from the execution or delivery of, or otherwise with respect to, this Agreement
or any other Loan Document.

     "Pension Plan" means any Employee Benefit Plan other than a Multiemployer
      ------------
Plan, that is subject to Section 412 of the Internal Revenue Code or Section 302
of ERISA.

     "Permitted Encumbrances" means:
      ----------------------

     (a)  inchoate Liens incident to construction or maintenance of real
property, or Liens incident to construction or maintenance of real property, now
or hereafter filed of record for which adequate reserves have been set aside and
which are being contested in good faith by appropriate proceedings and have not
proceeded to judgment, provided that, by reason of nonpayment of the obligations
                       --------
secured by such Liens, no such real property is subject to a material risk of
loss or forfeiture;

     (b)  Liens for taxes and assessments on real property which are not yet
past due, or Liens for taxes and assessments on real property for which adequate
reserves have been set aside and are being contested in good faith by
appropriate proceedings and have not proceeded to judgment, provided that, by
                                                            --------
reason of non-payment of the obligations secured by such Liens, no such real
property is subject to a material risk of loss or forfeiture;

     (c)  easements, exceptions, reservations, or other agreements granted or
entered into after the date hereof for the purpose of pipelines, conduits,
cables, wire communication lines, power lines and substations, streets, trails,
walkways, drainage, irrigation, water, and sewerage purposes, dikes, canals,
ditches, the removal of oil, gas, coal, or other minerals, and other like
purposes affecting real property which in the aggregate do not materially burden
or impair the fair market value or use of such real property for the purposes
for which it is or may reasonably be expected to be held;

     (d)  rights reserved to or vested in any Governmental Agency by Law to
control or regulate, or obligations or duties under Law to any Governmental
Agency with respect to, the use of any real property;

                                       14
<PAGE>
 
      (e)  rights reserved to or vested in any Governmental Agency by Law to
control or regulate, or obligations or duties under Law to any Governmental
Agency with respect to, any right, power, franchise, grant, license, or permit;

      (f)  present or future zoning laws and ordinances or other laws and
ordinances restricting the occupancy, use, or enjoyment of real property;

      (g)  statutory Liens, other than those described in clauses (a) or (b)
above, arising in the ordinary course of business with respect to obligations
which are not delinquent or are being contested in good faith by appropriate
proceedings, provided that, if delinquent, adequate reserves have been set aside
             --------
with respect thereto and, by reason of nonpayment, no Property is subject to a
material risk of loss or forfeiture;

      (h)  Liens consisting of pledges or deposits to secure obligations under
workers' compensation laws or similar legislation, including Liens of
judgments thereunder which are not currently dischargeable;

      (i)  Liens consisting of pledges or deposits of Property to secure
performance in connection with operating leases made in the ordinary course of
business to which the Company or a Subsidiary is a party as lessee, provided the
                                                                    --------
aggregate value of all such pledges and deposits in connection with any such
lease does not at any time exceed 16-2/3% of the annual fixed rentals payable
under such lease;

      (j)  Liens consisting of deposits of Property to secure statutory
obligations of the Company or a Subsidiary of the Company in the ordinary course
of its business;

      (k)  Liens consisting of deposits of Property to secure (or in lieu of)
surety, appeal or customs bonds in proceedings to which the Company or a
Subsidiary of the Company is a party in the ordinary course of its business, but
not in excess of $10,000,000; and

      (l)  purchase money security interests or mortgages taken or retained by a
seller of collateral to secure all or part of its purchase price.

      "Person" means any entity, whether an individual, trustee, corporation,
       ------
general partnership, limited partnership, joint stock company, trust, estate,
unincorporated organization, business association, tribe, firm, joint venture,
Governmental Agency, or otherwise.

      "PBGC" means the Pension Benefit Guaranty Corporation (or any successor
       ----
thereto).

                                       15
<PAGE>
 
      "Property" means any interest in any kind of property or asset, whether
       --------
real, personal or mixed, or tangible or intangible.

      "Pro Rata Share" means, with respect to each Bank, with respect to the
       --------------
Commitment, and any Loan made under any portion of the Commitment, the
percentage set forth opposite the name of that Bank and that portion of the
Commitment on Schedule 2.1 as modified from time to time.
              ------------
      "Reference Banks" means Citibank, N.A., Bank of America NT&SA and ABN Amro
       ---------------
Bank N.V.

      "Regulation D" means Regulation D, as at any time amended, of the Board of
       ------------
Governors of the Federal Reserve System, or any other regulation in substance
substituted therefor.

      "Regulation U" means Regulation U, as at any time amended, of the Board of
       ------------
Governors of the Federal Reserve System, or any other regulation in substance
substituted therefor.

      "Request for Letter of Credit" means a written request for a Letter of
       ---------------------------- 
Credit substantially in the form of Exhibit H, together with the standard form
                                    ---------   
of application for letter of credit used by the Issuing Bank, signed by a Senior
Officer of the Borrower and properly completed to provide all information
required to be provided therein.

      "Request for Loan" means a written request for a Loan substantially in the
       ----------------
form of Exhibit I, signed by a Senior Officer of the Borrower and properly
        --------- 
completed to provide all information required to be included therein.

      "Requirement of Law" means, as to any Person, the articles or certificate
       ------------------
of incorporation and by-laws or other organizational or governing documents of
such Person, and any Law, or judgment, award, decree, writ or determination of a
Governmental Agency, in each case applicable to or binding upon such Person or
any of its Property or to which such Person or any of its Property is subject.

      "Responsible Official" means (a) when used with reference to a Person
       --------------------
other than an individual, any corporate officer of such Person, general partner
of such Person, corporate officer of a corporate general partner of such Person,
or corporate officer of a corporate general partner of a partnership that is a
general partner of such Person, or any other responsible official thereof duly
acting on behalf thereof, and (b) when used with reference to a Person who is an
individual, such Person. Any document or certificate hereunder that is signed or
executed by a Responsible Official of a Person shall be conclusively presumed to
have been authorized by all necessary corporate, partnership and/or other action
on the part of that Person.

                                       16
<PAGE>
 
      "Securities" means any capital stock, share, voting trust certificate,
       ----------
bond, debenture, note or other evidence of indebtedness, limited partnership
interest, or any warrant, option or other right to purchase or acquire any of
the foregoing.

      "Senior Officer" means the (a) chief executive officer, (b) chief
       --------------
operating officer, (c) chief financial officer, (d) corporate controller, or (e)
treasurer, in each case whatever the title nomenclature may be, of the Person
designated.

      "Shareholders' Equity" means, as of any date of determination,
       --------------------
shareholders' equity as of that date determined in accordance with Generally
Accepted Accounting Principles; provided that there shall be excluded from
                                --------
Shareholders' Equity any amount attributable to capital stock that is, directly
or indirectly, required to be redeemed or repurchased by the issuer thereof at a
specified date or upon the occurrence of specified events or at the election of
the holder thereof.

      "Subsidiary" means, as of any date of determination and with respect to
       ----------
any Person, any corporation, partnership or joint venture, whether now existing
or hereafter organized or acquired: (a) in the case of a corporation, of which a
majority of the securities having ordinary voting power for the election of
directors or other governing body (other than securities having such power only
by reason of the happening of a contingency) are at the time beneficially owned
by such Person and/or one or more Subsidiaries of such Person, or (b) in the
case of a partnership or joint venture, of which such Person or a Subsidiary of
such Person is a general partner or joint venturer or of which a majority of the
partnership or other ownership interests are at the time beneficially owned by
such Person and/or one or more of its Subsidiaries, excluding any partnership or
joint venture over which the Person or Subsidiary of such Person does not
exercise actual control.

      "Swap Agreement" means a written agreement between the Company and one or
       --------------
more financial institutions providing for "swap", "collar" or other interest
rate protection (other than "caps") with respect to any Indebtedness.

      "Tangible Net Worth" means, as of any date of determination, the
       ------------------   
Shareholders' Equity of the Company and its Consolidated Subsidiaries on that
date, minus the book value of any Intangible Assets of the Company and its
      -----
Consolidated Subsidiaries on that date.

      "Taxes" means any and all present and future taxes, duties, levies,
       -----
imposts, deductions, charges or withholdings with respect to any payment by any
Borrower pursuant to this Agreement or under any other Loan Document, and all
liabilities with respect thereto, excluding (i) taxes imposed on the net income
of any Bank or the Administrative Agent, and franchise or similar 

                                       17
<PAGE>
 
taxes imposed on any Bank or the Administrative Agent, by a jurisdiction under
the laws of which such Bank or the Administrative Agent, as the case may be, is
organized or in which its principal executive office is located or, in the case
of each Bank, in which its applicable lending office is located and (ii) in the
case of each Bank, any United States withholding tax imposed on such payments
but only to the extent that such Bank is subject to United States withholding
tax at the time such Bank first becomes a party to this Agreement.

      "Total Outstandings" means, as of any date of determination, the sum on
       ------------------                                              ---
that date of (a) the aggregate principal Indebtedness evidenced by the Notes,
plus (b) the aggregate then undrawn portion of Letters of Credit which are
- ----
issued and outstanding, plus (c) the aggregate unreimbursed drawings under
                        ----
Letters of Credit.

      "Type" when used with respect to any Loan or Advance, means the
       ----
designation of whether such Loan or Advance is a Base Rate Loan or Advance, a
Eurodollar Rate Loan or Advance or a Competitive Advance.

      "Unused Portion" means the Commitment, less Total Outstandings as to the
       --------------                        ----
Commitment.

      1.2 Use of Defined Terms. Any defined term used in the plural shall refer
          --------------------
to all members of the relevant class, and any defined term used in the singular
shall refer to any one or more of the members of the relevant class.

      1.3 Accounting Terms. All accounting terms not specifically defined in
          ----------------
this Agreement shall be construed in conformity with, and all financial data
required to be submitted by this Agreement shall be prepared in conformity with,
Generally Accepted Accounting Principles applied on a consistent basis, except
                                                                        ------
as otherwise specifically prescribed herein and except for changes concurred in
by the Company's independent public accountants. In the event that Generally
Accepted Accounting Principles change during the term of this Agreement such
that the financial covenants contained in Sections 6.7 and 6.8 would then be
                                          ------------     ---
calculated in a different manner or with different components, (a) the Borrowers
and the Banks agree to negotiate to amend this Agreement in such respects as are
necessary to conform those covenants as criteria for evaluating the Company's
financial condition to substantially the same criteria as were effective prior
to such change in Generally Accepted Accounting Principles and (b) the Company
shall be deemed to be in compliance with the financial covenants contained in
such Sections during the 60 day period following any such change in Generally
Accepted Accounting Principles if and to the extent that the Company would have
been in compliance therewith under Generally Accepted Accounting Principles as
in effect immediately prior to such change.

                                       18
<PAGE>
 
      1.4 Rounding.  Any financial ratios required to be maintained by the
          --------
Company pursuant to this Agreement shall be calculated by dividing the
appropriate component by the other component, carrying the result to one place
more than the number of places by which such ratio is expressed in this
Agreement and rounding the result up or down to the nearest number (with a 
round-up if there is no nearest number) to the number of places by which such
ratio is expressed in this Agreement.

      1.5 Exhibits and Schedules.  All Exhibits and Schedules to this Agreement,
          ----------------------
either as originally existing or as the same may from time to time be
supplemented, modified or amended, are incorporated herein by this reference. A
matter disclosed on any Schedule shall be deemed disclosed on all Schedules.

      1.6 References to "the Company and its Subsidiaries". Any reference herein
          -----------------------------------------------
to "the Company and its Subsidiaries" or the like shall refer solely to the
Company during such times, if any, as the Company shall have no Subsidiaries.

      1.7 Miscellaneous Terms.  The term "or" is disjunctive; the term "and" is
          -------------------
conjunctive. The term "shall" is mandatory; the term "may" is permissive.
Masculine terms also apply to females; feminine terms also apply to males. The
term "including" is by way of example and not limitation.

                                   ARTICLE 2
                          LOANS AND LETTERS OF CREDIT
                          ---------------------------

      2.1 Committed Advances - General.
          ----------------------------

      (a) Subject to the terms and conditions set forth in this Agreement,
   at any time and from time to time from the Closing Date through the Maturity
   Date, each Bank shall, according to its Pro Rata Share of the Commitment,
   make Committed Advances to the Borrowers under the Commitment in such amounts
   as the Borrowers may request that do not exceed in the aggregate at any one
   time outstanding the amount of that Bank's Pro Rata Share of the Commitment;
   provided that, giving effect to the Loan of which such Advance is a part, (i)
   --------
   the Total Outstandings shall not exceed the Commitment and (ii) the sum of
   all Committed Advances then outstanding plus the sum of all Competitive
                                           ----
   Advances then outstanding plus the face amount of all Letters of Credit then
                             ----
   outstanding plus the sum of all unreimbursed drawings under Letters of Credit
               ----
   shall not exceed the Commitment. Subject to the limitations set forth herein,
   the Borrowers may borrow and repay under the Commitment without premium or
   penalty. 

      (b) Subject to the next sentence, each Loan under this Section 2.1
                                                             ----------- 
   shall be made pursuant to a Request for Loan 

                                       19
<PAGE>
 
   which shall specify the requested (i) date of such Loan, (ii) type of Loan,
   (iii) amount of such Loan and (iv) Interest Period for such Loan. Unless the
   Administrative Agent has notified, in its sole and absolute discretion, the
   Borrowers to the contrary, a Loan may be requested by telephone by an
   Assistant Treasurer or Senior Officer of the Borrower, in which case the
   Borrower shall promptly confirm such request by transmitting a telecopy of,
   or at the Administrative Agent's request by mailing, a Request for Loan
   executed by a Senior Officer of such Borrower conforming to the preceding
   sentence to the Administrative Agent.

      (c) Promptly following receipt of a Request for Loan (or the receipt
   of a substitute request permitted under the second sentence of Section
                                                                  -------
   2.1(b)), the Administrative Agent shall notify each Bank by telephone (so
   -----
   long as such notce by telephone is followed by a notice in writing) or
   telecopier (the method of notice shall be at the Administrative Agent's
   option) of the date and type of the Loan, the applicable Interest Period and
   the amount of that Bank's Pro Rata Share of the Loan. Not later than 2:00
   p.m., New York time, on the date specified for any Loan subject to the
   provisions of Sections 2.2 and 2.3, each Bank shall make its Pro Rata Share
                 ------------     ---
   of the Loan in immediately available funds available to the Administrative
   Agent at the Administrative Agent's Office. Upon fulfillment of the
   applicable conditions set forth in Article 8 and subject to the provisions of
                                      ---------
   Sections 2.2 and 2.3, all Advances shall be credited in immediately available
   ------------     ---
   funds to the Designated Deposit Account.

      (d) Each Loan under the Commitment shall be in a minimum amount of
   $2,000,000 and multiples of $1,000,000 in excess of that amount. 

      (e) The Committed Advances made by each Bank under its Pro Rata Share of
   the Commitment shall be evidenced by that Bank's Committed Advance Note in
   the form set forth as Exhibit B.
                         ---------

      (f) A Request for Loan shall be irrevocable upon the Administrative
   Agent's first notification thereof.

      2.2 Base Rate Loans. Each request by a Borrower for a Base Rate Loan shall
          ---------------
be made pursuant to a Request for Loan (or telephonic request for Loan referred
to in the second sentence of Section 2.1(b), if applicable) received by the
                             -------------
Administrative Agent, at the Administrative Agent's Office, not later than 11:00
a.m., New York time, on the date of a proposed Base Rate Advance. All Loans
shall constitute Base Rate Loans unless properly designated as Eurodollar Rate
Loans pursuant to Section 2.3. Each Base Rate Loan shall consist of Committed
                  -----------
Advances.

                                       20
<PAGE>
 
          2.3 Eurodollar Rate Loans.
              ---------------------

          (a) Each request by a Borrower for a Eurodollar Rate Loan shall be
made pursuant to a Request for Loan (or telephonic request for Loan referred to
in the second sentence of Section 2.1(b), if applicable) received by the
                          --------------
Administrative Agent, at the Administrative Agent's Office, not later than 1:00
p.m., New York time, at least three (3) Eurodollar Banking Days before the first
day of the applicable Eurodollar Period.

          (b) On the second Eurodollar Banking Day before the first day of the
applicable Eurodollar Period, the Administrative Agent shall determine the
applicable Eurodollar Rate (which determination shall be conclusive in the
absence of manifest error) and prior to 1:00 p.m., New York time on that same
day shall give notice of the same to the Borrower and the Banks by telephone or
telecopier (the method of notice shall be at the Administrative Agent's option).

          (c) Unless all of the Banks otherwise consent, no Eurodollar Rate Loan
may be requested during the continuance of an Event of Default.

          (d) Each Eurodollar Rate Loan shall consist of Committed Advances.

          (e) Prior to the submission of a Request for Loan with respect to a
Eurodollar Rate Loan, any Borrower may request the Administrative Agent to
provide a non-binding estimate of the Eurodollar Rate that would then apply in
the event the Borrower submitted a Request for Loan.

          2.4  Competitive Advances.
               --------------------

          (a) Subject to the terms and conditions hereof, at any time and from
time to time from the Closing Date through the day that is thirty-one (31) days
prior to the Maturity Date, each Bank may in its sole and absolute discretion
make Competitive Advances to a Borrower pursuant to this Section in such
principal amounts as the Borrower may request pursuant to a Competitive Bid
Request, provided that, after giving effect to the making of each such
         --------
Competitive Advance, (i) the aggregate principal amount of the Indebtedness
evidenced by the Competitive Advance Notes and the Committed Advance Notes shall
not exceed the Commitment, (ii) the sum of all Committed Advances then
outstanding plus the sum of all Competitive Advances then outstanding plus the
            ----                                                      ----
face amount of all Letters of Credit then outstanding plus the sum of all
                                                      ----
unreimbursed drawings under Letters of Credit shall not exceed the Commitment,
and (iii) Total Outstandings shall not exceed the Commitment. Any Bank may
submit a Competitive Bid in an amount greater than, less 

                                       21
<PAGE>
 
than or equal to its respective Pro Rata Share of the Commitment, up to the
amount of the Competitive Bid Request.

          (b) Each Borrower shall request Competitive Advances by submitting a
Competitive Bid Request to the Administrative Agent by telephone or telecopier,
to be received by the Administrative Agent not later than 12:00 noon, New York
time, one Banking Day prior to the date of the proposed Competitive Advance,
which Competitive Bid Request shall specify the relevant date, amount and
maturity for the proposed Competitive Advance and shall otherwise be completed
to the satisfaction of the Administrative Agent.

          (c) Each Competitive Bid Request shall be made for a Competitive
Advance with a maturity of not less than seven (7) nor more than 180 days. No
Competitive Bid Request may be made for a Competitive Advance which has a
maturity date which is later than the Banking Day immediately preceding the
Maturity Date.

          (d) Each Competitive Bid Request shall be in a minimum amount of
$2,000,000 and multiples of $1,000,000 in excess thereof. 

          (e) Immediately following receipt of a Competitive Bid Request (or a
telephonic request in accordance with Section 2.4(b)), the Administrative Agent
                                      --------------
shall notify each Bank by telephone or telecopier (the method of notice shall be
at the Administrative Agent's option) of the relevant date, amount and maturity
and of the other relevant terms of the requested Competitive Advance.

          (f) Each Bank receiving a Competitive Bid Request may, in its sole and
absolute discretion, make or not make a Competitive Bid responsive to the
Competitive Bid Request. For purposes of this paragraph, a Competitive Bid shall
be deemed responsive if it offers a Competitive Advance which is of an amount
which is less than or equal to that specified in the Competitive Bid Request and
if it comports in all other respects to the Competitive Bid Request. If the Bank
which is then Administrative Agent determines, in its sole discretion, to submit
a Competitive Bid with respect to a Competitive Bid Request, it shall submit its
Competitive Bid to the Borrower by telecopier not later than 10:15 a.m., New
York time, on the Banking Day of the proposed Competitive Advance. Each other
Competitive Bid shall be submitted to the Administrative Agent via telecopier
not later than 10:45 a.m., New York time, on the date of the requested
Competitive Advance, and the Administrative Agent shall promptly thereafter
notify the Borrower by telephone or telecopier (the method of notification shall
be at the Administrative Agent's option) of the Competitive Bids. The Borrower
shall maintain the confidentiality of any Competitive Bid made by the

                                       22
<PAGE>
 
Administrative Agent or any Bank pending receipt by the Borrower of all other
Competitive Bids.

          (g) Each Competitive Bid shall specify the stated fixed interest rate
(on the basis of a year of 360 days times the actual number of days elapsed). A
Competitive Bid once submitted to a Borrower shall be irrevocable prior to the
time that the Borrower is required to accept such Competitive Bid as described
in clause (h) below.
   ----------
          (h) A Borrower may accept or reject any Competitive Bid in its sole
and absolute discretion at any time prior to 11:15 a.m., New York time, on the
Banking Day of the proposed Competitive Advance; provided that (a) acceptance of
                                                 --------
a Competitive Bid shall be by telephone, promptly confirmed by the Borrower in
writing by telecopier communicated to a Responsible Official of the
Administrative Agent, (which shall immediately notify the relevant Bank as
provided in clause (i) below) (b) the Borrower may not accept any Competitive
            ---------
Bid which quotes an interest rate which is higher than a rejected Competitive
Bid unless the rejected Competitive Bid is for an amount which is less than that
    ------
specified in the applicable Competitive Bid Request and (c) without the consent
of the Bank offering a Competitive Bid, the Borrower may not accept any
fractional portion of the amount specified in that Competitive Bid.

          (i) A Bank whose Competitive Bid has been accepted by a Borrower shall
make the Competitive Advance in accordance with the Competitive Bid Request and
with its Competitive Bid, subject to the applicable conditions set forth in this
Agreement and during the period when such Competitive Advance is outstanding,
the Pro Rata Share of the Commitment of each Bank shall be deemed reduced by its
Pro Rata Share of the principal amount of each such Competitive Advance. 


          (j) Promptly upon acceptance of a Competitive Bid, the Administrative
Agent shall notify each relevant Bank by telephone or telecopier of the
acceptance of that Bank's Competitive Bid and shall promptly notify each Bank
whose Competitive Bid is not accepted that its Competitive Bid has not been
accepted. Not later than 2:00 p.m., New York time, on the date of the
Competitive Advance, and upon fulfillment of the applicable conditions set forth
in Article 8, the Bank shall fund the Competitive Advance in immediately
   ---------
available funds to the Administrative Agent at the Administrative Agent's
Office. Upon receipt of such funds, the Administrative Agent shall promptly
credit the amount of the Competitive Advance to the Designated Deposit Account.

          (k) Unless all of the Banks otherwise consent, (i) no Competitive
Advances may be requested during the continuance of an Event of Default, and
(ii) not more than twelve (12) Competitive Advances may be outstanding at any
time. 

                                       23
<PAGE>
 
          (l) The Competitive Advances made by each Bank shall be evidenced by
that Bank's Competitive Advance Note.

           2.5 Voluntary Reduction of Commitment. The Company shall have the
               ---------------------------------
right, at any time and from time to time, without penalty or charge, upon at
least two (2) days' prior written notice to the Administrative Agent, to
voluntarily reduce, permanently and irrevocably, in a minimum amount of
$5,000,000 and multiples of $1,000,000 in excess thereof, or to terminate, all
or a portion of the then Unused Portion of the Commitment; provided that any
                                                           --------
such reduction or termination shall be accompanied by payment of all accrued and
unpaid commitment fees with respect to the portion of the Commitment being
reduced or terminated.

          2.6 Voluntary Conversion or Continuation of Committed Advances.
              ----------------------------------------------------------

          (a) The Borrower may on any Banking Day upon notice given to the
      Administrative Agent not later than 12:00 noon (New York City time) on the
      third Eurodollar Banking Day prior to the date of the proposed Conversion
      or continuance (a "Notice of Conversion/Continuation") and subject to the
                         ---------------------------------
      provisions of Section 2.3, (1) Convert all or any portion of Committed
      Advances of one Type into Advances of another Type and (2) upon the
      expiration of any Interest Period applicable to Committed Advances which
      are Eurodollar Rate Advances, continue all (or, subject to Section 2.3,
      any portion of) such Advances as Eurodollar Rate Advances and the
      succeeding Interest Period(s) of such continued Advances shall commence on
      the last day of the Interest Period of the Advances to be continued;
      provided, however, that any Conversion of any Eurodollar Rate Advances
      --------  -------
      into Base Rate Advances shall be made on, and only on, the last day of an
      Interest Period for such Eurodollar Rate Advances. Each such Notice of
      Conversion/Continuation shall, within the restrictions specified above,
      specify (i) the date of such continuation or Conversion, (ii) the
      Committed Advances (or, subject to Section 2.3, any portion thereof) to be
      continued or Converted, (iii) if such continuation is of, or such
      Conversion is into, Eurodollar Rate Advances, the duration of the Interest
      Period of each such Committed Advance, and (iv) in the case of a
      continuation of or a Conversion into a Eurodollar Rate Advance, that no
      Event of Default has occurred and is continuing. Each Conversion or
      continuation shall be in a minimum amount of $2,000,000 and multiples of
      $1,000,000.

          (b) If upon the expiration of the then existing Interest Period
      applicable to any Committed Advance which is a Eurodollar Rate Advance,
      the Borrower shall not have delivered a Notice of Conversion/Continuation
      in accordance with this Section 2.6, then such Advance shall upon such

                                       24
<PAGE>
 
      expiration automatically be Converted to a Base Rate Advance.

          (c) After the occurrence of and during the continuation of an Event of
      Default, the Borrower may not elect to have an Advance be made or
      continued as, or Converted into, a Eurodollar Rate Advance after the
      expiration of any Interest Period then in effect for that Advance.

          2.7  Letters of Credit.
               -----------------
          (a)  Subject to the terms and conditions hereof, at any time and from
      time to time from the Closing Date through the date that is thirty (30)
      days before the Maturity Date, the Issuing Bank shall issue such Letters
      of Credit as a Borrower may request by delivering a Request for Letters of
      Credit to the Issuing Bank; provided that, giving effect to such Letter of
                                  --------
      Credit, (i) the aggregate effective face amounts of all outstanding
      Letters of Credit will not exceed $25,000,000, (ii) the sum of all
      Committed Advances then outstanding plus the sum of all Competitive
                                          ---- 
      Advances then outstanding plus the face amount of all Letters of Credit
                                ----
      then outstanding plus the sum of all unreimbursed drawings under Letters
                       ----
      of Credit shall not exceed the Commitment, and (iii) Total Outstandings
      will not exceed the Commitment. Letters of Credit issued under the
      Commitment may be issued for terms up to five (5) years from the date of
      issuance but in no event shall the term of any such Letter of Credit
      extend beyond the Maturity Date. Each Letter of Credit shall be in a
      minimum amount of $500,000, unless otherwise consented to by the Issuing
      Bank. The issuance of any Letter of Credit shall constitute usage of the
      Commitment. Subject to the limitations set forth herein, the Borrowers may
      request Letters of Credit, reimburse drawings under Letters of Credit and
      request further Letters of Credit without premium or penalty.

          (b)  The Issuing Bank is under no obligation to Issue any Letter of
Credit if:

          (i)  any order, judgment or decree of any Governmental Agency or
      arbitrator shall by its terms purport to enjoin or restrain the Issuing
      Bank from issuing such Letter of Credit, or any Requirement of Law
      applicable to the Issuing Bank or any request or directive (whether or not
      having the force of law) from any Governmental Agency with jurisdiction
      over the Issuing Bank shall prohibit, or request that the Issuing Bank
      refrain from, the issuance of Letters of Credit generally or such Letter
      of Credit in particular;

                                       25
<PAGE>
 
         (ii)  the Issuing Bank has received written notice from the Majority
      Banks, the Administrative Agent or the Company on or prior to the Banking
      Day prior to the requested date of issuance of such Letter of Credit, that
      one or more of the applicable conditions contained in Section 8.2 is not
      then satisfied; or

         (iii)  any requested Letter of Credit is not in form acceptable to the
      Issuing Bank, or the issuance of a Letter of Credit shall violate any
      generally applicable policies of the Issuing Bank.

      (c) Each Request for Letter of Credit shall be submitted to the
Issuing Bank at least three (3) Banking Days prior to the date when the issuance
of a Letter of Credit is requested. Upon issuance of a Letter of Credit, the
Issuing Bank shall promptly notify the Banks of the amount and terms thereof.
Any Letter of Credit issued shall conform with the applicable Issuing Bank's
policies regarding form and substance.

      (d) Upon the issuance of a Letter of Credit, each Bank shall be deemed
to have irrevocably purchased from the Issuing Bank, without recourse to or
warranty from the Issuing Bank, a pro rata undivided participation in the Letter
of Credit, in an amount equal to that Bank's Pro Rata Share of the Commitment.
Without limiting the scope and nature of each Bank's participation in any Letter
of Credit, to the extent that the Issuing Bank has not been reimbursed by the
Borrower, in accordance with Section 2.7(e), for any payment made by the Issuing
                             --------------
Bank under any Letter of Credit, each Bank shall reimburse the Issuing Bank
promptly upon demand for the amount of such payment in accordance with its Pro
Rata Share of the Commitment, as the case may be. The obligation of each Bank to
so reimburse the Issuing Bank shall be absolute and unconditional and shall not
be affected by the occurrence of an Event of Default or any other occurrence or
event. Any such reimbursement shall not relieve or otherwise impair the
obligation of the Borrower to reimburse the Issuing Bank for the amount of any
payment made by the Issuing Bank under any Letter of Credit together with
interest as hereinafter provided.

      (e) After any drawing on a Letter of Credit, the Issuing Bank shall
notify the Borrower and the Administrative Agent by telephone or telecopier of
such drawing by 2:00 p.m., New York time, on the date such payment is to be made
and the Borrower shall reimburse the Issuing Bank, in immediately available
funds for any amount paid or to be paid by the Issuing Bank under such Letter of
Credit by 4:00 p.m., New York time on the date of such notice.

                                       26
<PAGE>
 
      (f) If the Borrower fails to make the payment required by Section 2.7(e),
                                                                -------------
the Administrative Agent shall notify the Banks by telephone or telecopier (the
method of notification shall be at the Administrative Agent's option) of the
unreimbursed amount of such payment. Each Bank irrevocably and unconditionally
agrees (irrespective of the occurrence of an Event of Default or any other
circumstance) that it shall make available to the Administrative Agent (for the
account of the applicable Issuing Bank) an amount equal to its respective
participation in same day funds, at the Administrative Agent's Office, not later
than the close of business (New York time) on the date notified by the
Administrative Agent. In the event that any Bank fails to make available to the
Administrative Agent the amount of such Bank's participation in such Letter of
Credit as provided above, the Issuing Bank (through the Administrative Agent)
shall be entitled to recover such amount on demand from such Bank together with
interest thereon, for each day from the date of such payment until the date such
amount is paid to the Issuing Bank, at the rate per annum equal to the Base Rate
plus 1%; provided that if such failure is solely the result of an administrative
- ----     --------
error (which determination shall be made by the Administrative Agent in its sole
discretion) or is solely the result of the Bank receiving notice too late in the
day to make payment to the Administrative Agent on that day, then the interest
rate for the first day of such delay shall be the overnight federal funds rate.
Any amount made available by a Bank to the Administrative Agent as such Bank's
participation in such Letter of Credit shall constitute a demand loan to the
Borrower bearing interest at a rate per annum equal to (i) from the date of any
payment made by the Issuing Bank through the date ten days after such payment,
the Base Rate, and (ii) thereafter, the Base Rate plus 2%; provided, that if a
                                                  ----     --------
Bank is prevented from making such demand loans by the provisions of the United
States Bankruptcy Code or otherwise, the amount so paid to the Issuing Bank by
such Bank shall constitute a funding and purchase by it of a participation in
such Letter of Credit disbursement by the Issuing Bank and all obligations of
the Borrower with respect thereto, including interest thereon to the extent
accruing from the date of such purchase. The Administrative Agent shall promptly
pay to the Issuing Bank all funds paid by the Banks to reimburse the Issuing
Bank for the payment made by it under the Letter of Credit.

      (g) The issuance of any supplement, modification, amendment, renewal,
or extension to or of any Letter of Credit shall be treated for the purposes of
Article 8 the same as the issuance of a new Letter of Credit.

      (h) If, for any reason, a Bank fails to pay its liability on a Letter
of Credit in accordance with the provisions of Section 2.7(f), then the Issuing
                                               -------------
Bank shall be 

                                       27
<PAGE>
 
automatically subrogated to the right of such defaulting Bank to any prepayment,
in full, of any loan created by virtue of a drawing on such Letter of Credit, or
such defaulting Bank's right to any reimbursement by the Borrower with respect
to any drawing, or any other right of such defaulting Bank in connection with or
resulting from the drawing on such Letter of Credit, prior to distribution of
any payments hereunder to the defaulting Bank. 


     (i) The obligation of the Borrowers to reimburse the Issuing Bank for the
amount of any payment made by the Issuing Bank under any Letter of Credit, and
the obligations of the Banks under their respective participations under the
Letters of Credit, shall be absolute, unconditional, and irrevocable and shall
not be affected by any of the following circumstances:

            (i)   any lack of validity or enforceability of the Letter of
          Credit, this Agreement, or any other agreement or instrument relating
          thereto;

            (ii)  any amendment or waiver of or any consent to departure from
          the Letter of Credit, this Agreement, or any other agreement or
          instrument relating thereto;

            (iii) the existence of any claim, setoff, defense, or other rights
          which any Borrower may have at any time against any Bank, any
          beneficiary of the Letter of Credit (or any persons or entities for
          whom any such beneficiary may be acting) or any other Person, whether
          in connection with the Letter of Credit, this Agreement, or any other
          agreement or instrument relating thereto, or any unrelated
          transactions;

            (iv)  any demand, statement, or any other document presented under
          the Letter of Credit proving to be forged, fraudulent, invalid, or
          insufficient in any respect or any statement therein being untrue or
          inaccurate in any respect whatsoever so long as any such document
          appeared to comply with the terms of the Letter of Credit;

            (v)   the solvency or financial responsibility of any party issuing
          any documents in connection with a Letter of Credit;

            (vi)  any failure or delay in notice of shipments or arrival of any
          property;

            (vii) any error in the transmission of any message relating to a
          Letter of Credit not caused by the Issuing Bank, or any delay or
          interruption in any such message;

                                       28
<PAGE>
 
            (viii) any error, neglect or default of any correspondent of any
          Bank in connection with a Letter of Credit;

            (ix)   any consequence arising from acts of God, war, insurrection,
          disturbances, labor disputes, emergency conditions or other causes
          beyond the control of the Issuing Bank;

            (x)    so long as the Issuing Bank in good faith determines that the
          draft, contract or document appears to comply with the terms of the
          Letter of Credit, the form, accuracy, genuineness or legal effect of
          any contract or document referred to in any document submitted to the
          Issuing Bank in connection with a Letter of Credit; and

            (xi)   where the Issuing Bank has acted in good faith and without
          gross negligence or willful misconduct and observed general banking
          usage, any other circumstance whatsoever.

          (j) the Issuing Bank shall be entitled to the protection accorded to
    the Administrative Agent pursuant to Section 10.6, mutatis mutandis.
                                         ------------  ------- --------  

          (k) The Issuing Bank may in its sole discretion replace any Bank with
    respect to such Bank's entire respective Pro Rata Share of the Commitment,
    if the senior unsecured long-term debt rating of such Bank or any bank
    controlling such Bank falls below Standard & Poor's Ratings Group "A-"
    rating or Moody's Investors Service, Inc. "A3" rating with a bank (which may
    be one or more of the Banks) reasonably acceptable to the Company. Any such
    replacement shall be accomplished by an assignment by such replaced Bank of
    its entire respective Pro Rata Share of the Commitment to the replacement
    Bank pursuant to the provisions of Section 13.9. The Issuing Bank will
                                       ------------
    promptly notify each Bank of any such substitution.

          (l)  As between the Borrower and the Issuing Bank, the Borrower
    assumes all risks of the acts and omissions of, or misuse of any Letter of
    Credit by, the respective beneficiaries of the Letters of Credit. In
    furtherance and not in limitation of the foregoing, the Issuing Bank shall
    not be responsible: (1) for the validity, genuineness or legal effect of any
    document submitted by any party in connection with the issuance of or any
    drawing under the Letters of Credit, even if it should in fact prove to be
    in any or all respects invalid, fraudulent or forged; (2) for the validity
    or sufficiency of any instrument transferring or assigning or purporting to
    transfer or assign any Letter of Credit or the rights or benefits thereunder
    or proceeds thereof, in whole or in part, which may prove to be invalid

                                       29
<PAGE>
 
          or ineffective for any reason; (3) for errors in interpretation of
          technical terms; (4) for the misapplication by the beneficiary of any
          Letter of Credit of the proceeds of any drawing under such Letter of
          Credit; provided that none of the events set forth in the foregoing
                  --------
          clauses (1) through (4) shall have been caused by the gross negligence
          or wilful misconduct of the Issuing Bank; and (5) for any consequences
          arising from causes beyond the control of the Issuing Bank.  None of
          the above shall affect, impair, or prevent the vesting of any of the
          Issuing Bank's rights or powers hereunder.  In furtherance and
          extension and not in limitation of the specific provisions hereinabove
          set forth, any action taken or omitted by an Issuing Bank under or in
          connection with the Letters of Credit, if taken or omitted in good
          faith, without gross negligence or willful misconduct, shall not put
          the Issuing Bank under any resulting liability to the Borrowers or the
          Banks.

               (m)  The Issuing Bank shall have no obligation whatsoever to make
          any factual or legal determinations as to the correctness of any
          demand or payment under any Letter of Credit strictly complying with
          the terms of such Letter of Credit before the Issuing Bank makes any
          payment under the Letter of Credit. The Borrowers and the Banks hereby
          waive (A) diligence, presentment, demand, protest or notice of any
          kind, (B) any requirement that the Issuing Bank exhaust any right or
          remedy against the Borrowers, the Administrative Agent, any other
          participant in the credit, or any other Person, and (C) any claim or
          defense based on any time or other indulgence granted to the Borrower,
          the Administrative Agent or any other Person and any right of
          subrogation to any rights or remedies of the Issuing Bank in respect
          of any of the Letters of Credit or any defense that the Issuing Bank
          has impaired any such right of subrogation.

               (n) In the event that any payment made by or on behalf of the
          Borrower pursuant to or in connection with any Letter of Credit is
          rescinded or must otherwise be restored or returned to the Borrower or
          other relevant party, as applicable, including as a result of any
          insolvency, bankruptcy or reorganization or similar proceedings in
          respect of the Borrower, the obligations of the Banks under this
          Section 2.7(n) in respect of such rescinded, restored or returned
          --------------
          payment shall be reinstated in full and the Banks shall be liable to
          indemnify the Issuing Bank hereunder as fully as if such payment had
          never been made. The provision of this Section 2.7(n) shall survive
                                                 --------------
          the payment of the obligations of the Borrowers under the Letters of
          Credit.

               (o) All amounts to be paid to the Issuing Bank by the Banks under
          this Agreement shall be paid by the Banks to the Administrative Agent
          for the account of the Issuing Bank, without any set-off or
          counterclaim whatsoever and free and

                                       30
<PAGE>
 
          clear of any without deduction for or on account of any taxes, duties
          or other charges whatsoever, and without any liability therefor.

          2.8 Administrative Agent's Right to Assume Funds Available for
              --------------------------------------------------------- 
Advances. Unless the Administrative Agent shall have been notified by any Bank
- --------
no later than the Banking Day prior to the funding by the Administrative Agent
of any Loan that such Bank does not intend to make available to the
Administrative Agent such Bank's Pro Rata Share of the total amount of such
Loan, the Administrative Agent may assume that such Bank has made such amount
available to the Administrative Agent on the date of the Loan and the
Administrative Agent may, in reliance upon such assumption, make available to
the Borrower a corresponding amount. Unless the Administrative Agent shall have
been notified by the appropriate Bank no later than one hour prior to the
funding by the Administrative Agent of any Competitive Advance by the
Administrative Agent on behalf of that Bank such Bank does not intend to make
available to the Administrative Agent such Bank's Competitive Advance the
Administrative Agent may assume that such Bank has made such amount available to
the Administrative Agent and the Administrative Agent may in reliance upon such
assumption, make available to the Borrower a corresponding amount. If the
Administrative Agent has made funds available to the Borrower based on such
assumptions and such corresponding amount is not in fact made available to the
Administrative Agent by such Bank, the Administrative Agent shall be entitled to
recover such corresponding amount on demand from such Bank, which demand shall
be made in a reasonably prompt manner. If such Bank does not pay such
corresponding amount forthwith upon the Administrative Agent's demand therefor,
the Administrative Agent promptly shall notify the Borrower and the Borrower
shall pay such corresponding amount to the Administrative Agent. The
Administrative Agent also shall be entitled to recover from such Bank interest
on such corresponding amount in respect of each day from the date such
corresponding amount was made available by the Administrative Agent to the
Borrower to the date such corresponding amount is recovered by the
Administrative Agent, at a rate per annum equal to the actual cost to the
Administrative Agent of funding such amount as notified by the Administrative
Agent to such Bank. Nothing herein shall be deemed to relieve any Bank from its
obligation to fulfill its Pro Rata Share of the Commitment or to prejudice any
rights that the Administrative Agent or the Borrower may have against any Bank
as a result of any default by such Bank hereunder.

              2.9  Extension of Maturity Date.  In the event that: (a) the
                   --------------------------
Company requests in writing no more than 90 days but no less than 60 days prior
to any anniversary of the Closing Date (an "Anniversary Date") prior to the
Maturity Date that the Maturity Date be extended for one year; (b) each Bank
shall have determined in its sole discretion to consent to such extension; and
(c) the Administrative Agent shall have delivered a written

                                       31
<PAGE>
 
notice of such determination to the Company no less than 15 days prior to such
Anniversary Date, then the Maturity Date shall be extended for an additional
one-year period.  Any Bank that shall not have indicated its determination under
this Section 2.9 to the Administrative Agent on or prior to the 15th day prior
to such Anniversary Date shall be deemed not to have consented to such
extension.

                                   ARTICLE 3
                               PAYMENTS AND FEES
                               -----------------
          3.1  Principal and Interest
               ----------------------

          (a) Interest shall be payable on the outstanding daily unpaid
    principal amount of each Loan and each Competitive Advance from the date
    thereof until payment in full is made and shall accrue and be payable at the
    rates set forth herein before and after default, before and after maturity,
    before and after judgment, and before and after the commencement of any
    proceeding under any Debtor Relief Law, with interest on overdue interest to
    bear interest at the Default Rate to the fullest extent permitted by
    applicable Laws.
    
          (b) Interest accrued on each Base Rate Loan shall be payable quarterly
    in arrears on the last day of each March, June, September and December
    commencing on the first such date to occur after the Closing Date. Except as
                                                                       ------
    otherwise provided in Section 3.9, the unpaid principal amount of any Base
                          -----------
    Rate Loan shall bear interest at a fluctuating rate per annum equal to the
    Base Rate. Each change in the interest rate hereunder shall take effect
    simultaneously with the corresponding change in the Base Rate. Each change
    in the Base Rate shall be effective as of 12:01 a.m., New York time, on the
    Banking Day on which the change in the Base Rate is announced, unless
    otherwise specified in such announcement, in which case the change shall be
    effective as so specified.

          (c) Interest accrued on each Eurodollar Rate Loan the Eurodollar
     Period for which is three months or less shall be due and payable on the
     last day of the applicable Eurodollar Period. Interest accrued on each
     other Eurodollar Rate Loan shall be due and payable on every three month
     anniversary of the date which is three months after the date such
     Eurodollar Rate Loan was made, converted or continued pursuant to Section
     2.6 and on the last day of the Eurodollar Period. Except as otherwise
                                                       ------
     provided in Section 3.9, the unpaid principal amount of any Eurodollar Rate
                 -----------
     Loan shall bear interest at a rate per annum equal to the Eurodollar Rate
     for that Eurodollar Rate Loan plus the Applicable Percentage. Each change
                                   ----
     in the Applicable Percentage shall be effective as of the date of the
     public 

                                       32
<PAGE>
 
     announcement or publication by Standard & Poor's Ratings Group or Moody's
     Investors Service, Inc. of a change in the Company's senior unsecured long-
     term debt ratings. Each Bank claiming a right to payment of a Eurodollar
     Reserve Percentage in connection with any Eurodollar Rate Loan shall
     deliver to the Company and the Administrative Agent a statement setting
     forth in reasonable detail the amount of the Eurodollar Reserve Percentage
     and the calculation of the increased amount payable by the Company in
     respect of that Bank's Pro Rata Share of such Eurodollar Rate Loan. The
     Company shall pay to the Administrative Agent, for the account of such
     Bank, the amount of the Eurodollar Reserve Percentage set forth in such
     Bank's statement together with each payment of interest on the applicable
     Eurodollar Rate Loan.

          (d) Interest accrued on each Competitive Advance shall be due and
     payable on the maturity date of the Competitive Advance. Except as
                                                              ------
     otherwise provided in Section 3.9, the unpaid principal amount of each
                           -----------
     Competitive Advance shall bear interest at the rate specified in the
     relevant Competitive Bid.

          (e) If not sooner paid, the principal Indebtedness evidenced by the
     Notes shall be payable as follows:

              (i)  the principal amount of each Loan shall be payable on the
          Maturity Date; and

              (ii) the principal amount of each Competitive Advance shall be
          payable on the maturity date of that Competitive Advance.

          (f) The Committed Advance Notes may, at any time and from time to
     time, voluntarily be paid or prepaid in whole or in part without premium or
     penalty, except that with respect to any voluntary prepayment under this
              ------
     subsection, (i) any partial prepayment shall be in minimum amount of
     $2,000,000 and multiples of $1,000,000 in excess thereof, (ii) the
     Administrative Agent shall have received written notice of any prepayment
     by 11:00 a.m. (New York time) on the date of prepayment (which shall be a
     Banking Day), in the case of a Base Rate Loan, and by 1:00 p.m. (New York
     time) three (3) Banking Days before the date of prepayment, in the case of
     a Eurodollar Rate Loan, which notice shall identify the date and amount of
     the prepayment and the Loan(s) being prepaid, (iii) each prepayment of
     principal shall be accompanied by payment of interest accrued through the
     date of payment on the amount of principal paid and (iv) in any event, any
     payment or prepayment of all or any part of any Eurodollar Rate Loan on a
     day other than the last day of the applicable Interest Period shall be
     subject to Section 3.8(c).
                --------------

                                       33
<PAGE>
 
          (g) The Competitive Advance Notes may not be voluntarily prepaid in
     whole or in part without the consent of the holder thereof. In the event of
     any prepayment of the Competitive Advance Notes in violation of this
     Section, the Company shall pay to the affected Bank such amounts as are
     necessary, in the reasonable estimation of that Bank, to compensate that
     Bank for the effect of such prepayment.

          3.2  Commitment Fee.  On the last day of each Fiscal Quarter and on 
               --------------
the Maturity Date and, if earlier, the date of termination of the Commitment in
its entirety, the Company shall pay to the Administrative Agent, for the account
of each Bank according to its Pro Rata Share of the Commitment, commitment fees
equal to the Applicable Percentage times the average daily Unused Portion of the
                                   -----
Commitment during the Fiscal Quarter then ending. Each change in the Applicable
Percentage shall be effective on the date of the public announcement or
publication by Standard & Poor's Ratings Group or Moody's Investors Service,
Inc. of a change in the Company's senior unsecured long-term debt ratings.

          3.3  Arranger Fee and Agency Fees.  On the date of this Agreement, the
               ----------------------------
Company shall pay to the Arranger a fee in the amounts agreed upon by a letter
agreement dated the date hereof between the Company and the Arranger. Such fees
are for the sole account of the Arranger and are fully earned upon receipt and
non-refundable. On the date of this Agreement and on each anniversary thereof,
the Company shall pay to the Administrative Agent, agency fees in the amounts
agreed upon by letter agreements dated the date hereof between the Company and
the Administrative Agent. The agency fees are for the sole account of the
Administrative Agent and are fully earned upon receipt and non-refundable.

          3.4  LC Issuance Fee.  The Company shall pay, on the last day of each
               ---------------
Fiscal Quarter, a LC Issuance Fee to the Administrative Agent for the account of
the Issuing Bank, in the amounts agreed upon by letter agreements dated the date
hereof between the Company and the Issuing Bank. The LC Issuance Fees are for
the sole account of the applicable Issuing Bank and are fully earned upon
receipt and non-refundable.

          3.5  LC Reimbursement Fee.  The Company shall pay, on the last day of
               --------------------
each Fiscal Quarter, a LC Reimbursement Fee to the Administrative Agent, for the
pro rata benefit of the Banks in accordance with their respective Pro Rata
Shares of the Commitment, in an amount equal to the average daily face amount of
Letters of Credit outstanding during such Fiscal Quarter times the Applicable
Percentage. Each change in the Applicable Percentage shall be effective on the
date of the public announcement or publication by Standard & Poor's Ratings
Group or Moody's Investors Service, Inc. of a change in the Company's senior
unsecured long-term debt ratings.

                                       34
<PAGE>
 
          3.6  LC Drawing Fee.  The Company shall pay a drawing fee to the
               --------------
Issuing Bank in the amount of $250 for each drawing under any of its Letters of
Credit, payable on the date of such drawing.

          3.7  Capital Adequacy.  If any Bank (including an Issuing Bank)
               ----------------
determines in good faith that compliance with any Law or regulation or with any
guideline or request (excluding any published as of the date hereof or currently
scheduled to take effect) from any central bank or other Governmental Agency
(whether or not having the force of Law), in each case adopted or effective
after the date hereof has or would have the effect of reducing the rate of
return on the capital of such Bank or any corporation controlling such Bank as a
consequence of, or with reference to, such Bank's Pro Rata Share of any portion
of the Commitment or its making or maintaining of Advances, or its issuance of
any Letter of Credit, below the rate which such Bank or such other corporation
could have achieved but for such compliance (taking into account the policies of
such Bank or corporation with regard to capital), then the Company shall from
time to time, upon demand by such Bank (with a copy of such demand to the
Administrative Agent), immediately pay to such Bank additional amounts
sufficient to compensate such Bank or other corporation for such reduction. A
certificate as to such amounts, setting forth in reasonable detail the basis for
such calculations, submitted to the Company and the Administrative Agent by such
Bank, shall be conclusive and binding for all purposes, absent manifest error.
Each Bank agrees promptly to notify the Company and the Administrative Agent of
any circumstances that would cause the Company to pay additional amounts
pursuant to this Section 3.7. If any Bank shall have been compensated pursuant
                 -----------
to this Section 3.7, the Company shall have the right, upon 30 days prior notice
        -----------
to the Administrative Agent, with the assistance (but not the obligation) of the
Administrative Agent, to seek a substitute bank or banks (which may be one or
more of the Banks) satisfactory to the Company, the Administrative Agent and the
Issuing Bank to assume the Commitment of such Bank and to purchase the Notes of
such Bank and all amounts owing to such Bank in respect of Advances and Letters
of Credit under this Agreement pursuant to Section 13.9.
                                           ------------
          3.8  Increased Costs.
               ---------------
          (a)  If, after the date hereof, by reason of (i) the adoption of any
     Law by any Governmental Agency, central branch or comparable authority with
     respect to activities in the Eurodollar Market, or (ii) any change in the
     interpretation or administration of any existing Law by any Governmental
     Agency, central bank or comparable authority charged with the
     interpretation or administration thereof, or (iii) compliance by any Bank
     or its Eurodollar Lending Office or the Issuing Bank with any request or
     directive (whether or not having the force of Law) of any such Governmental
     Agency, central bank or comparable authority, 

                                       35
<PAGE>
 
     or (iv) the existence or occurrence of circumstances affecting the
     Eurodollar Market generally that are beyond the reasonable control of the
     Banks:

               (1)(A) any reserve (including, without limitation, any reserve
                                   ---------
          imposed by the Board of Governors of the Federal Reserve System),
          special deposit or similar requirements shall be imposed, modified or
          deemed applicable against assets of, deposits with or for the account
          of, or credit extended by, any Bank or its Eurodollar Lending Office
          or the Issuing Bank; or

               (B)  any Bank or its Eurodollar Lending Office or the Eurodollar
          Market or the Issuing Bank shall have imposed on it any other
          condition affecting any Advance, any of its Notes, its obligation to
          make Advances or this Agreement, or its obligation to make or maintain
          Letters of Credit hereunder, or any of the same shall otherwise be
          adversely affected;

     and the result of any of the foregoing, as determined by such Bank,
     increases the cost to such Bank or its Eurodollar Lending Office of making
     or maintaining any Advance or in respect of any Advance, any of its Notes
     or its obligation to make Advances or the issuance of maintenance of any
     Letter of Credit or reduces the amount of any sum received or receivable by
     such Bank or its Eurodollar Lending Office with respect to any Advance, any
     of its Notes or its obligation to make Advances (assuming such Bank's
     Eurodollar Lending Office had funded 100% of its Eurodollar Rate Advance in
     the Eurodollar Market) or in respect of Letters of Credit or its
     participation therein, then, upon demand by such Bank or the Issuing Bank
     (with a copy to the Administrative Agent), the Company shall pay to such
     Bank or the Issuing Bank, as the case may be, such additional amount or
     amounts as will compensate such Bank or the Issuing Bank, as the case may
     be, for such increased cost or reduction.  A statement of any Bank or the
     Issuing Bank claiming compensation under this subsection and setting forth
     the additional amount or amounts to be paid to it hereunder shall be
     conclusive in the absence of manifest error.  Each Bank and the Issuing
     Bank agree to endeavor promptly to notify the Company of any event of which
     it has actual knowledge (and, in any event, within 90 days from the date on
     which it obtained such knowledge), occurring after the Closing Date, which
     will entitle such Bank or the Issuing Bank to compensation pursuant to this
     Section, and agrees to designate a different Eurodollar Lending Office if
     such designation will avoid the need for or reduce the amount of such
     compensation and will not, in the judgment of such Bank or the Issuing
     Bank, otherwise be disadvantageous to such Bank or the Issuing Bank.  If
     any Bank claims compensation under this Section, the Company may at any
     time, upon at 

                                       36
<PAGE>
 
     least four (4) Banking Days' prior notice to the Administrative Agent and
     Banks and upon payment in full of the amounts provided for in this Section
     through the date of such payment plus any fee required by Section 3.8(c),
                                      ----                     --------------
     pay in full all Advances or request that all Eurodollar Rate Advances be
     converted to Base Rate Advances or all Base Rate Advances be converted to
     Eurodollar Rate Advances. If any Bank shall have been compensated pursuant
     to this Section 3.8(a), the Company shall have the right, upon 30 days
             --------------
     prior notice to the Administrative Agent, with the assistance (but not the
     obligation) of the Administrative Agent, to seek a substitute bank or banks
     (which may be one or more of the Banks) satisfactory to the Company, the
     Administrative Agent and the Issuing Bank to assume the Commitment of such
     Bank and to purchase the Notes of such Bank and all amounts owing to such
     Bank in respect of Advances and Letters of Credit under this Agreement
     pursuant to Section 13.9.
                 ------------

          (2) If any Bank shall have reasonably determined that it shall be
     unlawful for such Bank or its Eurodollar Lending Office to make, maintain
     or fund its portion of any Eurodollar Rate Loan, or the authority of such
     Bank to purchase or sell, or to take deposits of, dollars in the Eurodollar
     Market, or to determine or charge interest rates based upon the Eurodollar
     Rate has become unlawful, then such Bank shall so notify the Administrative
     Agent and the other Banks, and such Bank's obligation to make Eurodollar
     Rate Advances shall be suspended for the duration of such illegality and
     the Administrative Agent forthwith shall give notice thereof to the Company
     and such Bank shall make a Base Rate Advance as part of any successive
     Eurodollar Rate Loan. Upon receipt of such notice, the outstanding
     principal amount of all Eurodollar Rate Advances made by such Bank,
     together with accrued interest thereon, automatically shall be converted to
     Base Rate Advances with Interest Periods corresponding to the Eurodollar
     Loans of which such Eurodollar Rate Advances were a part on either (A) the
     last day of the Eurodollar Period(s) applicable to such Eurodollar Rate
     Advances if the affected Bank may lawfully continue to maintain and fund
     such Eurodollar Rate Advances to such day(s) or (B) immediately if the
     affected Bank may not lawfully continue to fund and maintain such
     Eurodollar Rate Advances to such day(s), provided that in such event the
                                              --------
     conversion shall not be subject to payment of a fee under Section 3.8(c).
                                                               --------------

          (b) If, with respect to any proposed Eurodollar Rate Loan:

              (i)  the Reference Banks reasonably determine that, by reason of
          circumstances affecting the Eurodollar Market generally that are
          beyond the reasonable control of the Banks, deposits in dollars (in
          the applicable amounts) are not being offered to 

                                       37
<PAGE>
 
          each of the Banks in the Eurodollar Market for the applicable
          Eurodollar Period; or

              (ii) the Reference Banks advise the Administrative Agent that the
          Eurodollar Rate as determined by the Administrative Agent (1) does not
          represent the effective pricing to such Banks for deposits in dollars
          in the Eurodollar Market in the relevant amount for the applicable
          Eurodollar Period, or (2) will not adequately and fairly reflect the
          cost to such Banks of making the applicable Eurodollar Rate Advances;

     then the Administrative Agent forthwith shall give notice thereof to the
     Company and the Banks, whereupon until the Administrative Agent notifies
     the Company that the circumstances giving rise to such suspension no longer
     exist, the obligation of the Banks to make any future Eurodollar Rate
     Advances shall be suspended. If at the time of such notice there is then
     pending a Request for Loan that specifies a Eurodollar Rate Loan, such
     Request for Loan shall be deemed to specify a Base Rate Loan.

          (c) The Company shall compensate each Bank for any loss sustained by
     that Bank in connection with the liquidation or re-employment of funds,
     excluding any loss of margin, and, without duplication, all actual out-of-
     pocket expenses (excluding allocations of any expense internal to such
     Bank) reasonably attributable thereto that such Bank may sustain: (i) if
     for any reason (other than a default by that Bank) a borrowing of any
     Eurodollar Rate Loan does not occur on a date or in the amount specified
     therefor in a Request for Loan or a telephonic request for loan or a
     Conversion to or continuation of any Eurodollar Rate Loan does not occur on
     a date specified therefor in a Notice of Conversion/Continuation or a
     telephone request for Conversion or continuation; (ii) if any prepayment or
     other principal payment or any conversion (other than as a result of a
     conversion required under Section 3.8(a)(2)) of any of its Eurodollar Rate
                               -----------------
     Loans occurs on a date prior to the last day of an Interest Period
     applicable to that Loan, or (iii) if any prepayment of any of its
     Eurodollar Rate Loans is not made on any date specified in a notice of
     prepayment given by the Company. Each Bank's determination of any amount
     payable under this Section 3.8(c) shall be conclusive in the absence of
                        --------------
     manifest error. Each Bank shall submit an invoice to the Administrative
     Agent of the amount payable by the Company under this Section 3.8(c)
                                                           --------------
     setting forth in reasonable detail the basis for such amount and the
     Administrative Agent shall notify the Company of such amount. The Company
     shall pay such amount to the Administrative Agent for the account of the
     relevant Bank, and the Administrative Agent shall promptly pay each
     relevant Bank the portion of the amount owed to it. 

                                       38
<PAGE>
 
          (d) Anything in this Agreement to the contrary notwithstanding, to the
     extent any notice under Section 3.7, 3.8 or 3.12 is given by any Bank more
     than 180 days after such Bank has knowledge (or should have had knowledge)
     of the occurrence of the event giving rise to the additional cost,
     reduction in amounts, loss, tax or other additional amounts described in
     such Section 3.7, 3.8 or 3.12, as the case may be, such Bank shall not be
     entitled to compensation under such Section for any such amounts incurred
     or accruing prior to the giving of such notice.

          3.9  Late Payments. If any installment of principal or interest or any
               -------------
fee or cost or other amount payable (other than those amounts covered under
Section 13.3) under any Loan Document to the Administrative Agent, Issuing Bank
or any Bank is not paid when due, it shall thereafter bear interest at a
fluctuating interest rate per annum at all times equal to the sum of the Base
Rate plus 2% per annum, to the fullest extent permitted by applicable Laws.
     ----
Accrued and unpaid interest on past due amounts (including, without limitation,
                                                 ---------
interest on past due interest) shall be compounded daily and shall be payable on
demand, to the fullest extent permitted by applicable Laws.

          3.10 Computation of Interest and Fees. Computation of interest on Base
               --------------------------------
Rate Loans shall be calculated on the basis of a year of 365 or 366 days, as the
case may be, and actual days elapsed. Computation of all fees and interest on
Eurodollar Rate Loans and Competitive Advances shall be calculated on the basis
of a year of 360 days and the actual number of days elapsed. Any Advance that is
repaid on the same day on which it is made shall bear interest for one day.

          3.11 Non-Banking Days. If any payment to be made by a Borrower or any
               ----------------
other party under any Loan Document shall come due on a day other than a Banking
Day, payment shall instead be considered due on the next succeeding Banking Day
and the extension of time shall be reflected in computing the amount of such
payment.

          3.12 Manner and Treatment of Payments.
               --------------------------------

          (a) Each payment hereunder or on the Notes or under any other Loan
     Document shall be made to the Administrative Agent, at the Administrative
     Agent's Office, for the account of each of the appropriate Banks or the
     Issuing Bank, as the case may be, in immediately available funds not later
     than 2:00 p.m., New York time, on the day of payment (which must be a
     Banking Day). All payments received after 2:00 p.m., New York time, on any
     particular Banking Day, shall be deemed received on the next succeeding
     Banking Day. The amount of all payments received by the Administrative
     Agent for the account of each Bank or Issuing Bank shall be promptly paid
     by the Administrative Agent to the applicable Bank or the Issuing Bank, as
     the case may be, in immediately

                                       39
<PAGE>
 
     available funds. All payments shall be made in lawful money of the United
     States of America.
     
          (b) Prior to the occurrence of any Event of Default, each payment or
     prepayment received by the Administrative Agent on account of any Loan or
     Competitive Advance shall be applied:

              (i)   To the Notes, pro rata in accordance with the aggregate
          principal Indebtedness owed to each Bank under the Notes,

              (ii)  Notwithstanding clause (i) above, any payment by a Borrower
          which is designated as a prepayment of a Competitive Advance Note
          shall be applied to such Competitive Advance Note, provided that (A)
                                                             --------
          the consent of the affected Bank to such prepayment has been obtained
          and (B) the payment of all amounts due with respect to the Loan
          Documents on the date of such prepayment shall have been provided for
          to the satisfaction of the Administrative Agent,

              (iii) Any mandatory prepayment of Loans shall be applied first to
          Base Rate Loans to the full extent thereof before application to
          Eurodollar Rate Loans as determined by Administrative Agent, in each
          case in a manner which minimizes the amount of any payments required
          to be made by Company pursuant to Section 3.8(c).

          (c) Each Bank shall use its best efforts to keep a record of Advances
     made by it and payments received by it with respect to its Notes and,
     subject to Section 10.6(g), such record shall be presumptive evidence of
                ---------------
     the amounts owing. Notwithstanding the foregoing sentence, no Bank shall be
     liable to any party for any failure to keep such a record.

          (d)  (i)  Each payment of any amount payable by any Borrower to or for
          the account of any Bank under this Agreement or any other Loan
          Document and by the Company acting in its capacity as guarantor under
          Article 11 shall be made free and clear of, and without reduction by
          reason of, any Taxes or Other Taxes. To the extent that a Borrower or
          the Company acting in its capacity as guarantor under Article 11 is
          obligated by applicable Laws to make any deduction or withholding on
          account of Taxes or Other Taxes, from any amount payable to any Bank
          under this Agreement, such Borrower shall (i) make such deduction or
          withholding and pay the same to the relevant Governmental Agency and
          (ii) pay such additional amount as is necessary to result in Bank's
          receiving, after all required deductions (including deductions
          applicable to 

                                       40
<PAGE>
 
          additional sums payable under this Section 3.12(d)) an amount equal to
          the amount to which that Bank would have been entitled under this
          Agreement or other Loan Document absent such deduction.

              (ii)  If and when receipt of a payment under this Section 3.12(d)
          results in an excess payment or credit to that Bank on account of the
          relevant Taxes or Other Taxes, that Bank shall refund such excess to
          such Borrower.

              (iii) Each Bank organized under the laws of a jurisdiction outside
          the United States, on or prior to the Closing Date in the case of each
          Bank listed on the signature pages hereof and on or prior to the date
          on which it becomes a Bank in the case of each other Bank, but in no
          event less than ten (10) Banking Days prior to the next succeeding
          Interest Payment Date, and from time to time thereafter if requested
          in writing by any Borrower, shall provide any Borrower and the
          Administrative Agent with Internal Revenue Service Form 1001 or 4224,
          as appropriate, or any successor form prescribed by the Internal
          Revenue Service, certifying that such Bank is entitled to benefits
          under an income tax treaty to which the United States is a party which
          exempts the Bank from withholding tax or reduces the rate of
          withholding tax in payments of interest for the account of such Bank
          or certifying that the income receivable pursuant to this Agreement
          and the other Loan Documents is effectively connected with the conduct
          of a trade or business in the United States; provided, however that
                                                       --------
          should a Bank, which is otherwise exempt from or subject to a reduced
          rate of withholding tax, become subject to Taxes because of its
          failure to deliver a form required hereunder, each Borrower shall take
          such steps as such Bank shall reasonably request to assist such Bank
          to recover such Taxes.

              (iv)  For any period with respect to which a Bank has failed to
          provide the Borrower or the Administrative Agent with the appropriate
          form pursuant to Section 3.12(d)(iii) (unless such failure is due to a
          change in treaty, law or regulation occurring subsequent to the date
          on which such form originally was required to be provided), such Bank
          shall not be entitled to indemnification under Section 3.12(d)(i) with
          respect to Taxes imposed by the United States.

              (v)   If a Borrower or the Company acting in its capacity as
          guarantor under Article 11 is required to pay additional amounts to or
          for the account of any Bank pursuant to this Section 3.12, then such
          Bank will change the jurisdiction of its applicable lending

                                       41
<PAGE>
 
          office if, in the judgment of such Bank, such change (i) will
          eliminate or reduce any such additional payment that may thereafter
          accrue and (ii) is not otherwise disadvantageous to such Bank.

          3.13  Funding Sources. Nothing in this Agreement shall be deemed to
                ---------------
obligate any Bank to obtain the funds for any Loan or Advance in any particular
place or manner or to constitute a representation by any Bank that it has
obtained or will obtain the funds for any Loan or Advance in any particular
place or manner. Each of the Borrowers agree that, for purposes of any
determination to be made under Section 3.8 or the definition of Eurodollar
Reserve Percentage, each Bank shall be deemed to have funded its Eurodollar Rate
Advances with dollar deposits in the London interbank market.

          3.14  Failure to Charge Not Subsequent Waiver. Any decision by any
                ---------------------------------------
Bank not to require payment of any interest (including interest arising under
                                             ---------
Section 3.9), fee, cost or other amount payable under any Loan Document, or to
- -----------
calculate any amount payable by a particular method, on any occasion shall in no
way limit or be deemed a waiver of such Bank's right to require full payment of
any interest (including interest arising under Section 3.9), fee, cost or other
              ---------                        -----------
amount payable under any Loan Document, or to calculate an amount payable by
another method, on any other or subsequent occasion.

          3.15  Administrative Agent's Right to Assume Payments Will be Made by
                ---------------------------------------------------------------
Borrower.  Unless the Administrative Agent shall have been notified by a
- --------
Borrower prior to the date on which any payment to be made by that Borrower
hereunder is due that such Borrower does not intend to remit such payment, the
Administrative Agent may, in its discretion, assume that such Borrower has
remitted such payment when so due and the Administrative Agent may, in its
discretion and in reliance upon such assumption, make available to each Bank on
such payment date an amount equal to such Bank's share of such assumed payment.
If a Borrower has not in fact remitted such payment to the Administrative Agent,
each Bank shall forthwith on demand repay to the Administrative Agent the amount
of such assumed payment made available to such Bank, together with interest
thereon in respect of each day from and including the date such amount was made
available by the Administrative Agent to such Bank to the date such amount is
repaid to the Administrative Agent at a rate per annum equal to the actual cost
to the Administrative Agent of funding such amount as notified by the
Administrative Agent to such Bank.

          3.16  Fee Determination Detail.  The Administrative Agent, the Issuing
                ------------------------
Bank and any Bank, shall provide reasonable detail to the Company regarding the
manner in which the amount of any payment to the Banks, or that Bank, under
Article 3 has been determined.
- ---------

                                       42
<PAGE>
 
          3.17  Survivability.  All of the Company's obligations under Sections
                -------------                                          --------
3.7 and 3.8 shall survive for thirty (30) days following the termination of this
- ---     ---
Agreement; provided, however, that such obligations shall not, from and after
           --------  -------
the termination of this Agreement, be deemed Obligations for any purpose under
the Loan Documents.

                                   ARTICLE 4
                        REPRESENTATIONS AND WARRANTIES
                        ------------------------------

          The Company represents and warrants to the Banks and each other
Borrower represents and warrants to the Banks (with respect to itself only)
that:

          4.1  Existence and Qualification; Power; Compliance With Laws.  Each
               --------------------------------------------------------
of such Borrower and its Subsidiaries is a corporation duly formed, validly
existing and in good standing under the Laws of the jurisdiction of its
incorporation. Each of such Borrower and its Subsidiaries is duly qualified to
transact business, and is in good standing, in any jurisdiction in which the
conduct of its business or the ownership or leasing of its Properties makes such
qualification or registration necessary, except where the failure so to qualify
                                         ------
or register and to be in good standing would not constitute a Material Adverse
Effect. Each of such Borrower and its Subsidiaries has all requisite corporate
power and authority to conduct its business and to own and lease its Properties.
Each Borrower has all requisite corporate power and authority to execute and
deliver each Loan Document to which it is a party and to perform its
Obligations. All outstanding shares of capital stock of each Borrower are duly
authorized, validly issued, fully paid, nonassessable and issued in compliance
with all applicable state and federal securities and other Laws. Each of such
Borrower and its Subsidiaries has obtained all authorizations, consents,
approvals, orders, licenses and permits from, and has accomplished all filings,
registrations and qualifications with, or obtained exemptions from any of the
foregoing from, any Governmental Agency that are necessary for the transaction
of its business, except where the failure so to comply, file, register, qualify
                 ------
or obtain exemptions does not constitute a Material Adverse Effect.

          4.2  Authority; Compliance With Other Agreements and Instruments and
               ---------------------------------------------------------------
Government Regulations. The execution, delivery and performance of the Loan
- ----------------------
Documents by such Borrower have been duly authorized by all necessary corporate
action, and do not:

          (a) Require any consent or approval not heretofore obtained of any
     partner, director, stockholder, security holder or creditor of such
     Borrower;

          (b) Result in or require the creation or imposition of any Lien upon
     or with respect to any Property now owned or leased or hereafter
     acquired by such Borrower;

                                       43
<PAGE>
 
          (c) Violate, to the best knowledge of such Borrower, any Requirement
     of Law applicable to such Borrower;

          (d) Result (or, with the giving of notice or passage of time or both,
     would result) in a breach of or default under, or cause or permit the
     acceleration of any obligation owed under any Contractual Obligation to
     which such Borrower is a party or by which such Borrower or any of its
     Property is bound or affected;

except where failure to receive such consent or approval or creation of such
Lien or violation of, or default under, any such Requirement of Law or
Contractual Obligation would not constitute a Material Adverse Effect.

          4.3  No Governmental Approvals Required.  Subject to the
               ----------------------------------
representations of the Banks contained in Section 13.9, no authorization,
                                          ------------
consent, approval, order, license or permit from, or filing, registration or
qualification with, any Governmental Agency is required to authorize or permit
under applicable Laws the execution, delivery and performance of the Loan
Documents by such Borrower.

          4.4  Subsidiaries.  Schedule 4.4 hereto correctly sets forth as of the
               ------------   ------------
Closing Date (i) the names, the form of legal entity, number of shares of
capital stock issued and outstanding, jurisdictions of organization and chief
executive offices of all Subsidiaries of such Borrower and (ii) the names, the
form of legal entity, equity percentage ownership, and jurisdictions of
organization of each partnership and joint venture that is excluded from the
definition of the term "Subsidiary" but as to which the Company or a Subsidiary
owns 50% or more of the ownership interests.

          4.5  Financial Statements.  The Company has furnished to the Banks the
               --------------------
audited consolidated financial statements of the Company and its Consolidated
Subsidiaries as at December 31, 1997 and for the twelve months then ended and
unaudited consolidated financial statements of the Company and its Subsidiaries
as at March 31, 1998 and for the three months then ended. Such financial
statements fairly present the financial condition and the results of operations
of the Company and its Subsidiaries as at such dates and for such periods in
accordance with Generally Accepted Accounting Principles.

          4.6  No Other Liabilities; No Material Adverse Effect.  As of the
               ------------------------------------------------
Closing Date, the Company and its Consolidated Subsidiaries do not have any
material liability or material contingent liability not reflected or disclosed
in the balance sheet or notes thereto described in Section 4.5, other than
                                                   -----------
liabilities and contingent liabilities arising in the ordinary course of
business subsequent to December 31, 1997. There has been no event or
circumstance that constitutes a Material Adverse 

                                       44
<PAGE>
 
Effect with respect to the Company and its Subsidiaries since December 31, 1997.

          4.7  Governmental Regulation.  No Borrower is subject to regulation
               -----------------------
under the Public Utility Holding Company Act of 1935, the Federal Power Act, the
Interstate Commerce Act, the Investment Company Act of 1940 or to any other Law
limiting or regulating its ability to incur Indebtedness for money borrowed.

          4.8  Litigation.  Except for (a) any matter fully covered (subject
               ----------   ------
to applicable deductibles and retentions) by insurance for which the insurance
carrier has assumed full responsibility, (b) matters described in public
documents filed with Governmental Agencies and delivered to the Banks prior to
the Closing Date, and (c) matters disclosed on Schedule 4.8 hereto, there are no
                                               ------------
actions, suits, proceedings or investigations pending as to which the Company or
any of its Subsidiaries have been served or have received notice or, to the best
knowledge of the Company, threatened against or affecting the Company or any of
its Subsidiaries or any Property of any of them before any Governmental Agency
which could reasonably be expected to constitute a Material Adverse Effect.

          4.9  Binding Obligations.  Each of the Loan Documents will, when
               -------------------
executed and delivered by such Borrower, constitute the legal, valid and binding
obligation of such Borrower, enforceable against such Borrower in accordance
with its terms, except as enforcement may be limited by Debtor Relief Laws or
                ------
equitable principles relating to the granting of specific performance and other
equitable remedies as a matter of judicial discretion.

          4.10 No Default.  No event has occurred and is continuing that is a
               ----------
Default or Event of Default.

           4.11 Employee Benefit Plans.
                ----------------------

           (a)  The Company and each of its ERISA Affiliates are in compliance
     with all applicable provisions and requirements of ERISA and the
     regulations and published interpretations thereunder with respect to each
     Employee Benefit Plan, and have performed all their obligations under each
     Employee Benefit Plan, except where the failure to be in such compliance or
     to perform such obligation would not constitute a Material Adverse Effect.

           (b)  No ERISA Event that would constitute a Material Adverse Effect
     has occurred or is reasonably expected to occur.

           (c)  Except to the extent required under Section 4980B of the Code,
     no Employee Benefit Plan maintained by the Company or any of its Current
     ERISA Affiliates provides health or welfare benefits (through the purchase
     of insurance or otherwise) for any retired or former employees of the
     Company or any of its Current ERISA Affiliates.

                                       45
<PAGE>
 
     (d)  As of the most recent valuation date for any Pension Plan with respect
to which the Company or a Subsidiary has any financial liability (including
potential joint and several liability) in the event any such Pension Plan were
to terminate, the amount of unfunded benefit liabilities (as defined in Section
4001(a)(18) of ERISA), individually or in the aggregate for all Pension Plans
(excluding for purposes of such computation any Pension Plans with respect to
which assets exceed benefit liabilities), does not exceed $30,000,000.

     4.12 Regulation U. No part of the proceeds of any Advance hereunder will be
          ------------
used to purchase or carry, or to extend credit to others for the purpose of
purchasing or carrying, any "margin stock" (as such term is defined in
Regulation U) in violation of Regulation U. Neither the Company nor any of its
Subsidiaries is engaged principally, or as one of its important activities, in
the business of extending credit for the purpose of purchasing or carrying any
such "margin stock."

     4.13 Disclosure.  All written information heretofore supplied by the
          ----------
Company to the Administrative Agent for the purposes of this Agreement is true
and accurate in all material respects on the date as of which such information
is stated. The Company has disclosed to the Administrative Agent all facts which
materially and adversely may, in the good faith opinion of the Company, affect
(to the extent the Company can reasonably foresee) the financial condition of
the Company and its Subsidiaries, taken as a whole, or the ability of the
Company to perform its obligations under this Agreement.

     4.14 Tax Liability.  Each of the Company and its Subsidiaries has filed or
          -------------
caused to be filed all tax returns which are required to have been filed by it,
and has paid or caused to be paid, or made provision for the payment of, all
taxes with respect to the periods, Property or transactions covered by said
returns, or pursuant to any assessment received by the Company or any of its
Subsidiaries, except (a) taxes for which the Company has been fully indemnified,
              ------
(b) such taxes, if any, as are being contested in good faith by appropriate
proceedings and as to which adequate reserves have been established and
maintained and (c) where the failure to so file or pay would be immaterial to
the financial condition, business or prospects of the Company.

     4.15 Environmental Matters.  As of the Closing Date, except as set forth in
          ---------------------
the Company's annual report on Form 10-K for the year ended December 31, 1997 to
the Securities and Exchange Commission, or as disclosed in Schedule 4.15 annexed
                                                           -------------
hereto, (a) the Company and each Subsidiary have complied with all Environmental
Laws, except to the extent that the failure to so comply would not be reasonably
likely to result in a Material Adverse Effect, (b) the Company's and its
Subsidiaries' facilities do not manage any hazardous wastes, hazardous
substances, hazardous materials, toxic substances or toxic

                                       46
<PAGE>
 
pollutants in any manner that would result in a violation of any Environmental
Law, except for violations that would not be reasonably likely to result in a
Material Adverse Effect and (c) the Company is aware of no events, conditions or
circumstances involving environmental pollution or contamination or public or
employee health or safety, in each case applicable to it or its Subsidiaries,
that has resulted or would be reasonably likely to result in a Material Adverse
Effect.

                                   ARTICLE 5
                             AFFIRMATIVE COVENANTS
                             ---------------------  
              (OTHER THAN INFORMATION AND REPORTING REQUIREMENTS)
              ---------------------------------------------------

      So long as any Advance remains unpaid, or any other Obligation remains
unpaid or unperformed, or any portion of the Commitment remains in force, each
Borrower shall, and shall cause each of its Subsidiaries to, unless the
Administrative Agent (acting on the direction of the Majority Banks) otherwise
consents in writing:

     5.1  Payment of Taxes and Other Potential Liens. Pay and discharge promptly
          ------------------------------------------
all taxes, assessments and governmental charges or levies imposed upon any of
them, upon their respective Property or any part thereof, or upon their
respective income or profits or any part thereof, except that the Company and
                                                  ------
its Subsidiaries shall not be required to pay or cause to be paid any tax,
assessment, charge or levy that is not yet past due, or is being contested in
good faith by appropriate proceedings, so long as the relevant entity has
established and maintains adequate reserves for the payment of the same and by
reason of such nonpayment and contest no material item or portion of Property of
the Company and its Subsidiaries, taken as a whole, is in jeopardy of being
seized, levied upon or forfeited.

     5.2  Preservation of Existence.  Preserve and maintain their respective
          -------------------------
existences in the jurisdiction of their formation and all authorizations,
rights, franchises, privileges, consents, approvals, orders, licenses, permits,
or registrations from any Governmental Agency that are necessary for the
transaction of their respective business, and qualify and remain qualified to
transact business in each jurisdiction in which such qualification is necessary
in view of their respective business or the ownership or leasing of their
respective Properties except where the failure to maintain such preservation or
maintenance of existence, authorizations, rights, franchises, privileges,
consents, approvals, orders, licenses, permits or registration or to do so
qualify would not constitute a Material Adverse Effect and; provided that a
                                                            --------
merger permitted under Section 6.2 shall not constitute a violation of this
                       -----------
covenant. Nothing herein contained shall prevent the termination of the business
or corporate existence of any Subsidiary (other than a Borrower) that, in the
judgment of the Company, is no longer necessary or

                                       47
<PAGE>
 
desirable, as long as immediately after giving effect to any such transaction,
no Default shall have occurred and be continuing.

     5.3  Maintenance of Properties.  Maintain, preserve and protect all of
          -------------------------  
their respective depreciable Properties in good order and condition, subject to
wear and tear in the ordinary course of business, and not permit any waste of
their respective Properties, except that any failure to so maintain, preserve or
                             ------
protect such Properties that does not constitute a Material Adverse Effect shall
not constitute a violation of this covenant.

     5.4  Maintenance of Insurance.  Maintain liability, casualty and other
          ------------------------
insurance (subject to customary deductibles and retentions), with responsible
insurance companies in such amounts and against such risks as is carried by
responsible companies engaged in similar businesses and owning similar assets in
the general areas in which the Company and its Subsidiaries operate; provided
that, notwithstanding the foregoing, the Company may self-insure for earthquake
risk.

     5.5  Compliance With Laws.  Comply with all Requirements of Law
          --------------------
noncompliance with which constitutes a Material Adverse Effect, except that the
                                                                ------
Company and its Subsidiaries need not comply with a Requirement of Law then
being contested by any of them in good faith by appropriate proceedings.

     5.6  Visitation.  Upon reasonable notice permit the Administrative Agent or
          ----------
representatives of any Bank at the Administrative Agent's or such Bank's expense
to visit any of its major properties and to discuss its affairs and finances
with its officers and independent public accountants, all at such reasonable
times and as often as may reasonably be requested.

     5.7  Keeping of Records and Books of Account. Keep adequate records and
          ---------------------------------------
books of account reflecting all financial transactions in conformity with
Generally Accepted Accounting Principles, and in material conformity with all
applicable requirements of any Governmental Agency having regulatory
jurisdiction over the Company or any of its Subsidiaries.

     5.8  Use of Proceeds.  Use the proceeds of Advances only for general
          ---------------
corporate purposes of the Borrowers; provided that proceeds of Advances shall
not be used for any Hostile Acquisition. Use the Letters of Credit only for
trade, commercial and standby letters of credit in the ordinary course of
business.

                                   ARTICLE 6
                              NEGATIVE COVENANTS
                              ------------------
     So long as any Advance remains unpaid, or any other Obligation remains
unpaid or unperformed, or any portion of the

                                       48
<PAGE>
 
Commitment remains in force, the Company shall not, and shall not permit any of
its Subsidiaries to, unless the Administrative Agent (acting on the direction of
the Majority Banks) otherwise consents in writing:

     6.1  Change in Nature of Business.  Make any material change in the nature
          ----------------------------
of the business of the Company and its Subsidiaries, taken as a whole, as at
present conducted.

     6.2  Mergers.  Merge, consolidate or amalgamate with or into any Person, or
          -------
convey substantially all of its Properties and assets to another Person, unless
                                                                         ------
each of the following conditions are met:

          (a) no Default or Event of Default exists or would exist immediately
     following the consummation of such merger, consolidation, amalgamation or
     conveyance;

          (b) in a merger, consolidation or amalgamation of the Company with
     another Person or Persons, the Company is the surviving entity;

          (c) in the case of a conveyance of Properties and assets, the
     Properties and assets conveyed do not consist of substantially all of the
     Properties and assets of the Company and its Subsidiaries taken as a whole;
     and

          (d) the Company and any Borrowers surviving the merger, consolidation
     or amalgamation continue in compliance with all the terms and conditions
     set forth in this Agreement.

     6.3  Acquisitions of Securities of the Company. Make any Investment in or
          -----------------------------------------
acquisition of Securities of the Company so long as an Event of Default is
continuing other than repurchases of Securities of the Company from terminated
           ----------
employees or consultants.

     6.4  Distributions.  Make any Distribution, whether from capital, income or
          -------------
otherwise, and whether in Cash or other Property, except:
                                                  ------

          (a) Distributions by Subsidiaries of the Company to the Company or to
     a wholly owned Subsidiary of the Company;

          (b) repurchases of Securities of the Company from terminated employees
     or consultants; and

          (c) any other Distribution if, after the making of such Distribution,
     there shall not exist an Event of Default or a breach by any Borrower of
     any covenant contained in Article 6.

                                       49
<PAGE>
 
     6.5 Liens; Negative Pledges; Sales and Leasebacks. Create, incur, assume or
         --------------------------------------------- 
suffer to exist any Lien of any nature upon or with respect to any of their
respective Properties, whether now owned or hereafter acquired, or engage in any
sale and leaseback transaction with respect to its Property, except:
                                                             ------

          (a)  Permitted Encumbrances;

          (b) Liens in favor of the Administrative Agent or the Banks under the
     Loan Documents;

          (c) Liens existing on the date hereof and listed on Schedule 6.5 and
                                                              ------------
     Liens on the same Property which secure Indebtedness which replaces or
     refinances the Indebtedness originally secured by those Liens; provided
                                                                    --------
     that the obligations secured thereby are not increased;

          (d) pre-existing Liens on assets acquired by the Company or any of its
     Subsidiaries after the Closing Date; and

          (e) Liens securing Indebtedness or obligations (including sale and
     leaseback transactions to which the Company or any Subsidiary is a party as
     vendor and lessee) incurred after the date hereof the outstanding amount of
     which Indebtedness or obligation does not in the aggregate exceed 35% of
     consolidated total assets of the Company (measured as of the last day of
     the most recently ended Fiscal Quarter).

     6.6  Transactions with Affiliates.  Enter into any transaction of any kind
          ----------------------------  
which is material to the Company and its Subsidiaries taken as a whole with any
Affiliate of the Company other than (a) transactions between or among the
                         ----------
Company and its Subsidiaries or between or among its Subsidiaries, (b)
transactions on terms at least as favorable to the Company or its Subsidiaries
as would be the case in an arm's-length transaction between unrelated parties of
equal bargaining power, and (c) transactions approved by a majority of the
disinterested members of the Board of Directors of Company or the applicable
Subsidiary.

     6.7  Interest Charge Coverage Ratio.  Permit the Interest Charge Coverage
          ------------------------------
Ratio, as of the last day of each Fiscal Quarter, to be less than 3.00 to 1.00.

     6.8  Tangible Net Worth.  Permit Tangible Net Worth, as of the last day of
          ------------------
each Fiscal Quarter, to be less than $1,500,000,000 plus the sum of the
                                                    ----
following amounts calculated separately for each Fiscal Quarter in the
Calculation Period and aggregated for all Fiscal Quarters in the Calculation
Period: (a) 25% of the net cash proceeds of any issuance by the Company of
equity securities during each such Fiscal Quarter plus (b) 25% of Net Income
(but not less than $0) for each such Fiscal Quarter

                                       50
<PAGE>
 
minus (c) 25% of any funds used by the Company to repurchase the Company's
- -----
equity securities during each such Fiscal Quarter. The term "Calculation Period"
means the period commencing January 1, 1998 and ending as of the last day of the
Fiscal Quarter for which the calculation is being made.

                                   ARTICLE 7
                    INFORMATION AND REPORTING REQUIREMENTS
                    --------------------------------------

     7.1  Financial and Business Information. So long as any Advance remains
          ----------------------------------
unpaid, or any other Obligation remains unpaid or unperformed, or any portion of
the Commitment remains in force, the Company shall, unless the Administrative
Agent (with the approval of the Majority Banks) otherwise consents in writing,
deliver to the Banks and the Administrative Agent, at the Company's sole
expense:

          (a) As soon as practicable, and in any event within 45 days after the
     end of each Fiscal Quarter (other than the fourth Fiscal Quarter in any
     Fiscal Year), (i) the consolidated balance sheets of the Company and its
     Subsidiaries as at the end of such Fiscal Quarter, (ii) consolidated
     statements of income and (iii) consolidated statements of cash flow, in
     each case described in clauses (ii) and (iii) of the Company and its
     Subsidiaries for such Fiscal Quarter and for the portion of the Fiscal Year
     ended with such Fiscal Quarter, all in reasonable detail. Such financial
     statements shall be certified by a Senior Officer of the Company as fairly
     presenting the financial condition, results of operations and changes in
     financial position of the Company and its Subsidiaries in accordance with
     Generally Accepted Accounting Principles (other than any requirement for
     footnote disclosures), as at such date and for such periods, subject only
     to normal year-end accruals and audit adjustments;

          (b) As soon as practicable, and in any event within 90 days after the
     end of each Fiscal Year, (i) the consolidated balance sheets of the Company
     and its Subsidiaries as at the end of such Fiscal Year, (ii) consolidated
     statements of income of the Company and its Subsidiaries for such Fiscal
     Year and (iii) consolidated statements of cash flow of the Company and its
     Subsidiaries for such Fiscal Year, all in reasonable detail. Such financial
     statements shall be prepared in accordance with Generally Accepted
     Accounting Principles, and such consolidated balance sheet and consolidated
     statements shall be accompanied by a report and opinion of Ernst & Young or
     other independent public accountants of recognized national standing
     selected by the Company, which report and opinion shall be prepared in
     accordance with generally accepted auditing standards as at such date;

                                       51
<PAGE>
 
          (c) Promptly after the same are available, copies of each annual
     report, proxy or financial statement or other report or communication sent
     to the shareholders of the Company, and copies of all annual, regular,
     periodic and special reports and registration statements which the Company
     or a Subsidiary of the Company may file or be required to file under
     Sections 13 or 15(d) of the Securities Exchange Act of 1934;

          (d) As soon as practicable, and in any event within five (5) Banking
     Days after a Senior Officer of the Company obtains actual knowledge of the
     existence of any condition or event which constitutes a Default or Event of
     Default, written notice specifying the nature and period of existence
     thereof and specifying what action the Company or any of its Subsidiaries
     is taking or proposes to take with respect thereto;

          (e) Promptly upon becoming aware of the occurrence of or forthcoming
     occurrence of any ERISA Event defined in clauses (i) through (vii) or (xi)
     of the definition thereof involving Title IV or ERISA that could reasonably
     be expected to result in material liability to the Company or its
     Subsidiaries or any ERISA Event that could reasonably be expected to result
     in a Material Adverse Effect, a written notice specifying the nature
     thereof, what action the Company or any of its ERISA Affiliates has taken,
     is taking or proposes to take with respect thereto and, when known, any
     action taken or threatened by the Internal Revenue Service, the Department
     of Labor or the PBGC with respect thereto;

          (f) With reasonable promptness, copies of (a) each Schedule B
     (Actuarial Information) to the annual report, if any (Form 5500 Series),
     filed by the Company or any of its Current ERISA Affiliates with the
     Internal Revenue Service with respect to each Pension Plan; (b) all notices
     received by the Company or any of its Current ERISA Affiliates from the
     sponsor of a Multiemployer Plan to which a Current ERISA Affiliate
     contributes concerning an ERISA Event defined in clauses (i) through (vii)
     or (xi) of the definition thereof; and (c) such other documents or
     governmental reports or filings relating to any Employee Benefit Plan as
     the Administrative Agent shall reasonably request; and

          (g) Such other material information directly related to any Borrower's
     ability to meet its Obligations hereunder as from time to time may be
     reasonably requested by the Administrative Agent or the Majority Banks.

     7.2  Compliance Certificates.  So long as any Advance remains unpaid, or
          -----------------------
any other Obligation remains unpaid or unperformed, or any portion of the
Commitment remains outstanding, the Company shall, unless the Majority Banks

                                       52
<PAGE>
 
otherwise consent, deliver to the Administrative Agent, at the Company's sole
expense, concurrently with the financial statements required pursuant to
Sections 7.1(a) and 7.1(b), a Compliance Certificate signed by a Senior Officer
- --------------      -----
of the Company, including calculations as set forth therein.

                                   ARTICLE 8
                                  CONDITIONS
                                  ----------

     8.1  Conditions to Effectiveness.  The Credit Agreement and the Commitments
          ---------------------------
of the Banks hereunder shall be effective on the date on which each of the
following conditions precedent, (unless the Administrative Agent, acting at the
direction of the Majority Banks, otherwise consents in writing) shall have been
satisfied:

          (a) The Administrative Agent shall have received all of the following,
     each of which shall be originals unless otherwise specified, each in form
     and substance satisfactory to the Administrative Agent, the Issuing Bank
     and the Banks:

             (1) executed counterparts of this Agreement, sufficient in number
          for distribution to the Banks and the Borrowers;

             (2) the Committed Advance Notes dated the Closing Date and executed
          by each Borrower in favor of each Bank, each in a principal amount
          equal to that Bank's Pro Rata Share of the Commitment;

             (3) the Competitive Advance Notes dated the Closing Date and
          executed by each Borrower in favor of each Bank, each in the principal
          amount of $150,000,000;

             (4) A certified copy of the Certificate of Incorporation of each
          Borrower, together with a good standing certificate from the Secretary
          of State of the State of incorporation of each Borrower and, to the
          extent generally available, a certificate or other evidence of good
          standing as to payment of any applicable franchise or similar taxes
          from the appropriate taxing authority of each of such states, each
          dated a recent date prior to the Closing Date;

             (5) Copies of each Borrower's Bylaws, certified as of the Closing
          Date by the corporate secretary or an assistant secretary of each such
          Borrower;

             (6) Resolutions of the Board of Directors of each Borrower
          approving and authorizing the execution, delivery and performance of
          this Agreement and the other Loan Documents to which each such
          Borrower is a

                                       53
<PAGE>
 
          party, certified as of the Closing Date by the corporate secretary or
          an assistant secretary of each such Borrower as being in full force
          and effect without modification or amendment;

             (7) Signature and incumbency certificates of the officers of each
          Borrower executing this Agreement and the other Loan Documents;

             (8) the favorable written opinion of George A. Vandeman, Esq.,
          General Counsel to the Company, substantially in the form of Exhibit 
                                                                       -------
          G-1, together with copies of any officer's certificate or opinion of
          ---
          another counsel or law firm specifically identified and expressly
          relied upon by such counsel in its opinion;

             (9) the favorable written opinion of O'Melveny & Myers LLP, counsel
          to the Administrative Agent, substantially in the form of Exhibit G-2;
                                                                    -----------

             (10) a Certificate of a Senior Officer of the Company certifying
          that the conditions specified in Sections 8.1(b), 8.1(c), and 8.1(d)
                                           --------------   -----       -----
          have been satisfied; and

             (11) such other assurances, certificates, documents, consents or
          opinions as the Administrative Agent reasonably may require.

           (b) The representations and warranties of the Borrowers contained in
     Article 4 shall be true and correct.
     ---------

          (c) Each Borrower shall be in compliance with all the terms and
     provisions of the Loan Documents.

          (d) The Company shall have repaid in full the indebtedness to the
     lenders under the Existing Loan Documents, as well as all interest, costs,
     fees and expenses associated therewith, and the commitment to lend under
     the Existing Loan Documents shall have been terminated.

          (e) The Company shall have paid to the Arranger and the Administrative
     Agent the fees payable on the date of this Agreement referred to in 
     Section 3.3.
     -----------

     8.2  Any Advance and Any Letter of Credit.  The obligation of each Bank to
          ------------------------------------
make any Competitive Advance (including the initial Advance), after acceptance
of a Competitive Bid of such Bank in accordance with Section 2.4, or to make any
Committed Advance, and the obligation of the Issuing Bank to issue any Letter of
Credit (including the initial Letter of Credit), is subject to the following
conditions precedent (unless the Administrative Agent, acting at the direction
of the Majority Banks, otherwise consents in writing):

                                       54
<PAGE>
 
          (a) except as disclosed by the Company and approved in writing by the
              ------
     Administrative Agent, acting at the direction of the Majority Banks, the
     representations and warranties contained in Article 4, other than Sections
                                                 ---------             --------
     4.4 and 4.8, and the first sentence of Section 4.6, shall be true and
     -----------                            -----------
     correct in all material respects on and as of the date of the Advance or
     the issuance of the Letter of Credit, as the case may be, as though made on
     that date (except to the extent such representations and warranties
                ------
     specifically relate to an earlier date in which case they shall be true and
     correct in all material respects as of such earlier date);

          (b) except for (a) any matter fully covered (subject to applicable
              ------
     deductibles and retentions) by insurance for which the insurance carrier
     has assumed full responsibility, and (b) matters described in clauses (b)
     or (c) of Section 4.8 on the Closing Date, there shall be no actions,
               -----------
     suits, proceedings or investigations pending as to which the Company or any
     of its Subsidiaries have been served or have received notice or, to the
     best knowledge of the Company, threatened against the Company or any of its
     Subsidiaries or any Property of any of them before any Governmental Agency
     which could reasonably be expected to constitute a Material Adverse Effect;
     and

          (c) the Administrative Agent shall have timely received a Request for
     Loan in compliance with Article 2 (or telephonic request for loan referred
                             ---------
     to in the second sentence of Section 2.1(b), if applicable) or Request for
                                  -------------
     Letter of Credit in compliance with Article 2, if applicable.
                                         ---------

                                   ARTICLE 9
             EVENTS OF DEFAULT AND REMEDIES UPON EVENT OF DEFAULT
             -----------------------------------------------------

     9.1  Events of Default.  The existence or occurrence of any one or more of
          -----------------
the following events, whatever the reason therefor and under any circumstances
whatsoever, shall constitute an "Event of Default":
                                 ----------------

          (a) Any Borrower fails to pay any principal on any of the Notes, or
     any portion thereof, on the date when due; or

          (b) Any Borrower (i) fails to pay any interest on any of the Notes, or
     any portion thereof, or (ii) fails to pay any other fee or amount payable
     to the Administrative Agent, the Banks or the Issuing Bank under any Loan
     Document, or any portion thereof, in each case within five (5) Banking Days
     after demand therefor; or

          (c) Any failure to comply with Section 7.1(d) that is materially
                                         --------------
     adverse to the interests of the Administrative Agent or the Banks; or

                                       55
<PAGE>
 
          (d) Any Borrower fails to perform or observe any other covenant or
     agreement contained in any Loan Document on its part to be performed or
     observed within thirty (30) days after the giving of notice by the
     Administrative Agent or the Majority Banks of such Default; provided,
                                                                 --------
     however, that any failure to observe any of the covenants contained in
     -------
     Sections 6.2 and 6.4, shall constitute an immediate Event of Default
     ------------     ---
     hereunder; provided, further, that any failure to observe any of the
                --------  -------
     covenants contained in Section 6.5 shall constitute an Event of Default
                            -----------
     upon notice from the Administrative Agent (acting on the direction of the
     Majority Banks) to the Company; and provided further that any failure to
                                         -------- -------
     observe any of the covenants contained in Sections 6.7 and 6.8 shall
                                               ------------     ---
     constitute an Event of Default five (5) Banking Days after knowledge by the
     Company of such Default (other than as a result of the giving of notice by
     the Administrative Agent or the Majority Banks as hereinafter provided) or,
     if earlier, the giving of notice by the Administrative Agent or the
     Majority Banks of such Default; or

          (e) Any representation or warranty made in this Agreement, any Notes,
     any Request for Loan, any Agreement to Participate, any Request for Letter
     of Credit or any Competitive Bid Request was, based on the facts and
     circumstances reasonably known to the Borrower at the time such
     representation and warranty was made, incorrect when made or reaffirmed in
     any respect that is materially adverse to the interests of the Banks; or

          (f) The Company or any of its Subsidiaries (i) fails to pay the
     principal, or any principal installment, or any interest or fees or any
     other amount of any present or future indebtedness (other than under the
                                                         ----------
     Notes) for borrowed money in an amount in excess of the Cross-Default
     Amount, or any guaranty of present or future indebtedness for borrowed
     money in an aggregate amount in excess of the Cross-Default Amount, on its
     part to be paid, when due (or within any stated grace period), whether at
     the stated maturity, upon acceleration, by reason of required prepayment or
     otherwise or (ii) fails to perform or observe any other material term,
     covenant or agreement on its part to be performed or observed, or suffers
     any event to occur, and such failure or event continues after the
     applicable grace period, if any, and is not waived, in connection with any
     present or future indebtedness for borrowed money in an amount in excess of
     the Cross-Default Amount, or of any guaranty of present or future
     indebtedness for borrowed money in excess of the Cross-Default Amount, if
     as a result of such failure or sufferance any holder or holders thereof (or
     an agent or trustee on its or their behalf) has the right to declare such
     indebtedness due before the date on which it otherwise would become due; or

                                       56
<PAGE>
 
          (g) Any Loan Document, at any time after its execution and delivery
     and for any reason other than the agreement of the Banks or satisfaction in
     full of all the Obligations, ceases to be in full force and effect or is
     declared by a court of competent jurisdiction to be null and void, invalid
     or unenforceable in any respect which, in any such event in the reasonable
     opinion of the Majority Banks, is materially adverse to the interests of
     the Banks; or any Borrower denies that it has any or further liability or
     obligation under any Loan Document, or purports to revoke, terminate or
     rescind same; or

          (h) A judgment against the Company or any of its Subsidiaries is
     entered for the payment of money in excess of $50,000,000 and, absent
     procurement of a stay of execution, such judgment remains unstayed,
     unbonded or unsatisfied for sixty (60) calendar days after the date of
     entry of judgment; or

          (i) The Company, any Borrower or any other Subsidiary of the Company
     the Shareholder's Equity of which, as shown on the most recent consolidated
     balance sheet, equals or exceeds 10% of the Shareholder's Equity of the
     Company and its Consolidated Subsidiaries as shown on such consolidated
     balance sheet, institutes or consents to any proceeding under a Debtor
     Relief Law relating to it or to all or any part of its Property, or is
     unable or admits in writing its inability to pay its debts as they mature,
     or makes an assignment for the benefit of creditors; or applies for or
     consents to the appointment of any receiver, trustee, custodian,
     conservator, liquidator, rehabilitator or similar officer for it or for all
     or any part of its Property; or any receiver, trustee, custodian,
     conservator, liquidator, rehabilitator or similar officer is appointed
     without the application or consent of that Person and the appointment
     continues undischarged or unstayed for sixty (60) calendar days; or any
     proceeding under a Debtor Relief Law relating to any such Person or to all
     or any part of its Property is instituted without the consent of that
     Person and continues undismissed or unstayed for sixty (60) calendar days;
     or any judgment, writ, warrant of attachment or execution or similar
     process is issued or levied against all or any material part of the
     Property of any such Person and is not released, vacated or fully bonded
     within sixty (60) calendar days after its issue or levy; or any order for
     relief shall be entered in respect of the Company or any Borrower or any
     such Subsidiary; or

          (j) (i) Any Person or two or more Persons acting in concert shall
     acquire beneficial ownership (within the meaning of Rule 13d-3 of the
     Securities and Exchange Commission under the Securities Exchange Act of
     1934) directly or indirectly, of securities of the Company (or other
     securities convertible into such securities)

                                       57
<PAGE>
 
     representing 30% or more of the combined voting power of all securities of
     the Company entitled to vote in the election of directors, other than
     securities having such power only by reason of the happening of a
     contingency; or (ii) during any period of up to 12 consecutive months,
     commencing before or after the date of this Agreement, individuals who at
     the beginning of such 12-month period were directors of the Company, or
     whose nomination for election to the Board of Directors of the Company was
     recommended or approved by a vote of at least a majority of the directors
     then still in office who were directors of the Company on the first day of
     such period, shall cease for any reason to constitute a majority of the
     Board of Directors of the Company; (iii) or any Person or two or more
     Persons acting in concert shall have acquired by contract or otherwise, or
     shall have entered into a contract or arrangement which upon consummation
     will result in its or their acquisition of, control over securities of the
     Company (or other securities convertible into such securities) representing
     30% or more of the combined voting power of all securities of the Company
     entitled to vote in the election of directors, other than securities having
     such power only by reason of the happening of a contingency; provided,
                                                                  --------
     however, that there shall not be an Event of Default pursuant to
     -------
     subsections (i) or (iii) above with respect to any Persons who on the date
     hereof meet the requirements set forth in said subsections (i) or (iii); or

          (k) there shall occur one or more ERISA Events which individually or
     in the aggregate results in or might reasonably be expected to result in
     liability of the Company, a Subsidiary or any of their Current ERISA
     Affiliates in excess of $50,000,000 during the term of this Agreement; or
     there shall exist an amount of unfunded benefit liabilities (as defined in
     Section 4001(a)(18) of ERISA), individually or in the aggregate for all
     Pension Plans with respect to which the Company or a Subsidiary has any
     financial liability, including potential joint and several liability in the
     event any such Pension Plan were to terminate (excluding for purposes of
     such computation any Pension Plans with respect to which assets exceed
     benefit liabilities), which exceeds $50,000,000.

     9.2  Remedies Upon Event of Default. Without limiting any other rights or
          ------------------------------
remedies of the Administrative Agent, the Issuing Bank or the Banks provided for
elsewhere in this Agreement, or the Loan Documents, or by applicable Law, or in
equity, or otherwise:

          (a) Upon the occurrence, and during the continuance, of any Event of
     Default other than an Event of Default described in Section 9.1(i):
                                                         --------------

                                       58
<PAGE>
 
              (1) the commitment to make Advances, issue Letters of Credit and
          all other obligations of the Administrative Agent, the Banks or the
          Issuing Bank and all rights of the Borrowers and any other Parties
          under the Loan Documents shall be suspended without notice to or
          demand upon any Borrower, which are expressly waived by the Borrowers,
          except that the Majority Banks (or all of the Banks, in the case of an
          ------
          Event of Default described in Sections 9.1(a) or 9.1(b)) may waive the
                                        ---------------    ------
          Event of Default or, without waiving, determine, upon terms and
          conditions satisfactory to the Majority Banks (or all of the Banks, as
          the case may be), to reinstate the Commitment and make further
          Advances and issue additional Letters of Credit, which waiver or
          determination shall apply equally to, and shall be binding upon, all
          the Banks and the Issuing Bank; and

              (2) the Majority Banks may request the Issuing Bank to, and the
          Issuing Bank thereupon shall, demand immediate deposit by the
          Borrowers into an account designated by the applicable Issuing Bank of
          Cash in an amount equal to the aggregate effective face amount of all
          outstanding Letters of Credit issued by it; and

              (3) the Majority Banks may request the Administrative Agent to,
          and the Administrative Agent thereupon shall, terminate the Commitment
          and declare all or any part of the unpaid principal of all Notes, all
          interest accrued and unpaid thereon and all other amounts payable
          under the Loan Documents to be forthwith due and payable, whereupon
          the same shall become and be forthwith due and payable, without
          protest, presentment, notice of dishonor, demand or further notice of
          any kind, all of which are expressly waived by the Borrowers.
     
          (b) Upon the occurrence of any Event of Default described in Section
                                                                       -------
     9.1(i):
     -----

              (1) the commitment to make Advances, issue Letters of Credit and
          all other obligations of the Administrative Agent or the Banks and all
          rights of the Borrowers and any other Parties under the Loan Documents
          shall terminate without notice to or demand upon any Borrower, which
          are expressly waived by the Borrowers; and

              (2) an amount equal to the aggregate effective face amount of all
          outstanding Letters of Credit shall be forthwith due and payable to
          the Issuing Bank, without protest, presentment, notice of dishonor,
          demand or further notice of any kind, all of which are waived by the
          Borrowers; and

                                       59
<PAGE>
 
             (3) the unpaid principal of all Notes, all interest accrued and
          unpaid thereon and all other amounts payable under the Loan Documents
          shall be forthwith due and payable, without protest, presentment,
          notice of dishonor, demand or further notice of any kind, all of which
          are expressly waived by the Borrowers.

          (c) Upon the occurrence of any Event of Default, the Banks and the
     Administrative Agent, or any of them, without notice to or demand upon any
     Borrower, which are expressly waived by the Borrowers, may proceed to
     protect, exercise and enforce their rights and remedies under the Loan
     Documents against the Borrowers and any other party and such other rights
     and remedies as are provided by Law or equity.

          (d) The order and manner in which the Banks' rights and remedies are
     to be exercised shall be determined by the Majority Banks in their sole
     discretion, and all payments received by the Administrative Agent and the
     Banks, or any of them, shall be applied first to the costs and expenses
     (including attorneys' fees and disbursements) of the Administrative Agent,
     acting as Administrative Agent, and of the Banks, and thereafter paid pro
     rata to the Banks in the same proportions that the aggregate Obligations
     owed to each Bank under the Loan Documents bear to the aggregate
     Obligations owed under the Loan Documents to all the Banks, without
     priority or preference among the Banks. Regardless of how each Bank may
     treat payments for the purpose of its own accounting, for the purpose of
     computing the Borrowers' Obligations hereunder and under the Notes,
     payments shall be applied first, to the costs and expenses of the
                               -----
     Administrative Agent, acting as Administrative Agent, and the Banks, as set
     forth above, second, to the payment of accrued and unpaid interest due
                  ------
     under any Loan Documents to and including the date of such application
     (ratably, and without duplication, according to the accrued and unpaid
     interest due under each of the Loan Documents), and third, to the payment
                                                         -----
     of all other amounts (including principal and fees) then owing to the
     Administrative Agent or the Banks under the Loan Documents. No application
     of payments will cure any Event of Default, or prevent acceleration, or
     continued acceleration, of amounts payable under the Loan Documents, or
     prevent the exercise, or continued exercise, of rights or remedies of the
     Banks hereunder or thereunder or at law or in equity.

          (e) Upon the occurrence of an Event of Default resulting from or
     resulting in the default by the Company in the repayment of its Eurodollar
     Rate Loans when required by the terms of this Agreement, the Company shall
     compensate each Bank in accordance with Section 3.8(c).
                                             --------------

                                       60
<PAGE>
 
                                  ARTICLE 10
                           THE ADMINISTRATIVE AGENT
                           ------------------------

     10.1  Appointment and Authorization.  Each Bank and the Issuing Bank hereby
           -----------------------------
irrevocably appoints and authorizes the Administrative Agent to take such action
as agent on its behalf and to exercise such powers under the Loan Documents as
are delegated to the Administrative Agent by the terms thereof or are reasonably
incidental, as determined by it, thereto. This appointment and authorization is
intended solely for the purpose of facilitating the servicing of the Advances
and does not constitute appointment of the Administrative Agent as trustee for
any Bank or the Issuing Bank or as representative of any Bank or the Issuing
Bank for any other purpose and, except as specifically set forth in the Loan
                                ------
Documents to the contrary, the Administrative Agent shall take such action and
exercise such powers only in an administrative and ministerial capacity. The
Administrative Agent is the agent of the Banks and the Issuing Bank only and
does not assume any agency relationship with any Borrower, express or implied.

     10.2  Administrative Agent and Affiliates.  The Administrative Agent and
           -----------------------------------
its Affiliates (and each successor Administrative Agent) have the same rights
and powers under the Loan Documents as any other Bank and may exercise the same
as though it were not the Administrative Agent to the extent either the
Administrative Agent or an Affiliate has executed this Agreement as a Bank or
has executed an Assignment Agreement as Assignee. The Administrative Agent and
its Affiliates (and each successor Administrative Agent) may accept deposits
from, lend money to and generally engage in any kind of banking, trust or other
business with any Borrower, any subsidiary thereof, or any Affiliate of the
Company or any Subsidiary thereof, without any duty to account therefor to the
Banks. CUSA (and each successor Administrative Agent) need not account to any
Bank for any monies received by it for reimbursement of its costs and expenses
as Administrative Agent hereunder, or for any monies received by it or any
Affiliate in its capacity as a Bank hereunder. The Administrative Agent shall
not be deemed to hold a fiduciary relationship with any Bank and no implied
covenants, functions, responsibilities, duties, obligations or liabilities shall
be read into this Agreement or otherwise exist against the Administrative Agent.

     10.3  Proportionate Interest of the Banks in any Collateral.  The
           -----------------------------------------------------
Administrative Agent, on behalf of all the Banks, shall hold in accordance with
the Loan Documents all items of any collateral or interests therein received or
held by the Administrative Agent. Subject to the Administrative Agent's and the
Banks' rights to reimbursement for their costs and expenses hereunder (including
                                                                       ---------
attorneys' fees and disbursements and other professional services) and subject
to the application of payments in accordance with Section 9.2(d), each Bank
                                                  -------------
shall have an interest in any collateral or interests therein in the same

                                       61
<PAGE>
 
proportions that the aggregate Obligations owed such Bank under the Loan
Documents bear to the aggregate Obligations owed under the Loan Documents to all
the Banks, without priority or preference among the Banks.

     10.4  Banks' Credit Decisions.  Each Bank agrees that it has, independently
           -----------------------
and without reliance upon either Arranger, the Administrative Agent, any other
Bank or the directors, officers, agents, employees or attorneys of either
Arranger or the Administrative Agent or of any other Bank, and instead in
reliance upon information supplied to it by or on behalf of the Borrowers and
upon such other information as it has deemed appropriate, made its own
independent credit analysis and decision to enter into this Agreement. Each Bank
also agrees that it shall, independently and without reliance upon either
Arranger or the Administrative Agent, any other Bank or the directors, officers,
agents, employees or attorneys of either Arranger or the Administrative Agent or
of any other Bank, continue to make its own independent credit analyses and
decisions in acting or not acting under the Loan Documents.

     10.5  Action by the Administrative Agent.
           ----------------------------------

          (a) The Administrative Agent may assume that no Default has occurred
     and is continuing, unless the Administrative Agent has failed to receive
     any payment due from any Borrower hereunder within the time required under
     subsection 9.1(a) or subsection 9.1(b), or the Administrative Agent has
     received notice from the Company stating the nature of the Default or has
     received notice from a Bank stating the nature of the Default and that such
     Bank considers the Default to have occurred and to be continuing.

          (b) The Administrative Agent has only those obligations under the Loan
     Documents as are expressly set forth therein.

          (c) Except for any obligation expressly set forth in the Loan
              ------
     Documents and as long as the Administrative Agent may assume that no Event
     of Default has occurred and is continuing, the Administrative Agent may,
     but shall not be required to, exercise its discretion to act or not act,
     except that the Administrative Agent shall be required to act or not act
     ------
     upon the instructions of the Majority Banks (or of all the Banks, to the
     extent required by Section 13.2) and those instructions shall be binding
                        ------------
     upon the Administrative Agent and all the Banks, provided that the
                                                      --------
     Administrative Agent shall not be required to act or not act if to do so
     would be contrary to any Loan Document or to applicable Law or would
     result, in the reasonable judgment of the Administrative Agent, in
     substantial risk of liability to the Administrative Agent.

                                       62
<PAGE>
 
          (d) If the Administrative Agent has received a notice specified in
     clause (a), the Administrative Agent shall give notice thereof to the Banks
     and shall act or not act upon the instructions of the Majority Banks (or of
     all the Banks, to the extent required by Section 13.2), provided that the
                                              ------------   --------
     Administrative Agent shall not be required to act or not act if to do so
     would be contrary to any Loan Document or to applicable Law or would
     result, in the reasonable judgment of the Administrative Agent, in
     substantial risk of liability to the Administrative Agent, and except that
                                                                    ------
     if the Majority Banks (or all the Banks, if required under Section 13.2)
                                                                ------------
     fail, for five (5) Banking Days after the receipt of notice from the
     Administrative Agent, to instruct the Administrative Agent, then the
     Administrative Agent, in its sole discretion, may act or not act as it
     deems advisable for the protection of the interests of the Banks.

          (e) The Administrative Agent shall have no liability to any Bank for
     acting, or not acting, as instructed by the Majority Banks (or all the
     Banks, if required under Section 13.2), notwithstanding any other provision
                              ------------
     hereof.

     10.6  Liability of the Administrative Agent.  Neither the Administrative
           -------------------------------------
Agent, nor any of its directors, officers, agents, employees or attorneys shall
be liable for any action taken or not taken by them under or in connection with
the Loan Documents, except for their own gross negligence or willful misconduct.
                    ------
Without limitation on the foregoing, the Administrative Agent and its directors,
officers, agents, employees and attorneys:

          (a) May treat the payee of any Note as the holder thereof until the
     Administrative Agent receives notice of the assignment or transfer thereof,
     in form satisfactory to the Administrative Agent, signed by the payee, and
     may treat each Bank as the owner of that Bank's interest in the Obligations
     for all purposes of this Agreement until the Administrative Agent receives
     notice of the assignment or transfer thereof, in form satisfactory to the
     Administrative Agent, signed by that Bank.

          (b) May consult with legal counsel (including in-house legal counsel),
                                              ---------
     accountants (including in-house accountants) and other professionals or
                  ---------
     experts selected by it, or with legal counsel, accountants or other
     professionals or experts for the Company and/or its subsidiaries or the
     Banks, and shall not be liable for any action taken or not taken by it in
     good faith in accordance with any advice of such legal counsel, accountants
     or other professionals or experts.

          (c) Shall not be responsible to any Bank for any statement, warranty
     or representation made in any of the Loan Documents or in any notice,
     certificate, report,

                                       63
<PAGE>
 
     request or other statement (written or oral) given or made in connection
     with any of the Loan Documents.

          (d) Shall have no duty to ask or inquire as to the performance or
     observance by the Company or its Subsidiaries of any of the terms,
     conditions or covenants of any of the Loan Documents or to inspect any
     collateral or the Property, books or records of the Company or its
     Subsidiaries.

          (e) Will not be responsible to any Bank for the due execution,
     legality, validity, enforceability, genuineness, effectiveness, sufficiency
     or value of any Loan Document, any other instrument or writing furnished
     pursuant thereto or in connection therewith, or any collateral.

          (f) Will not incur any liability by acting or not acting in reliance
     upon any Loan Document, notice, consent, certificate, statement, request or
     other instrument or writing believed by it to be genuine and signed or sent
     by the proper party or parties.

          (g) Will not incur any liability for any arithmetical error in
     computing any amount paid or payable by the Company or any Subsidiary or
     Affiliate thereof or paid or payable to or received or receivable from any
     Bank under any Loan Document, including, without limitation, principal,
                                   ---------
     interest, commitment fees, Advances and other amounts; provided that,
                                                            --------
     promptly upon discovery of such an error in computation, the Administrative
     Agent, the Banks and (to the extent applicable) the Company and/or its
     Subsidiaries or Affiliates shall make such adjustments as are necessary to
     correct such error and to restore the parties to the position that they
     would have occupied had the error not occurred; provided further that, the
                                                     -------- -------
     obligations of Borrowers under this Section 10.6(g) shall survive for sixty
     (60) days following the termination of this Agreement and such obligations
     shall not, from and after the termination of this Agreement, be deemed
     Obligations for any purpose under the Loan Documents.

          10.7  Indemnification. Each Bank shall, ratably in accordance with its
                ---------------
Pro Rata Share of the Commitment, indemnify and hold the Administrative Agent,
the Arranger and their directors, officers, agents, employees and attorneys
harmless against any and all liabilities, obligations, losses, damages,
penalties, actions, judgments, suits, costs, expenses or disbursements of any
kind or nature whatsoever (including, without limitation, attorneys' fees and
                           ---------
disbursements) that may be imposed on, incurred by or asserted against them in
any way relating to or arising out of the Loan Documents (other than losses
incurred by reason of the failure of the Borrowers to pay the indebtedness
represented by the Notes and interest thereon) or any action taken or not taken
by them as Administrative Agent or Arranger thereunder, except such as result
                                                        ------
from its own gross

                                       64
<PAGE>
 
negligence or willful misconduct. Without limitation on the foregoing, each Bank
shall reimburse the Administrative Agent and each Arranger upon demand for that
Bank's ratable share of any cost or expense incurred by the Administrative Agent
and such Arranger in connection with the negotiation, preparation, execution,
delivery, amendment, waiver, restructuring, reorganization (including a
                                                            ---------
bankruptcy reorganization), enforcement or attempted enforcement of the Loan
Documents, to the extent that the Company or any other party is required by
Section 13.3 to pay that cost or expense but fails to do so upon demand. Nothing
- ------------
in this Section shall entitle the Administrative Agent and the Arranger to
recover any amount from the Banks if and to the extent that such amount has
theretofore been recovered from the Company or any of its Subsidiaries.

     10.8  Successor Administrative Agent.  The Administrative Agent may resign
           ------------------------------
as such at any time upon prior written notice to the Company and the Banks, to
be effective upon a successor's acceptance of appointment as Administrative
Agent. The Majority Banks at any time may remove the Administrative Agent by
written notice to that effect to be effective on such date as the Majority Banks
designate. In either event: (a) the Majority Banks, with the written consent of
the Company (such consent not to be unreasonably withheld), shall appoint a
successor Administrative Agent, who must be from among the Banks, provided that
                                                                  --------
any resigning Administrative Agent shall be entitled to appoint a successor
Administrative Agent from among the Banks, subject to acceptance of appointment
by that successor Administrative Agent, if the Majority Banks have not appointed
a successor Administrative Agent within thirty (30) days after the date the
resigning Administrative Agent gave notice of resignation; (b) upon a successor
acceptance of appointment as Administrative Agent, the successor will thereupon
succeed to and become vested with all the rights, powers, privileges and duties
of the resigning Administrative Agent or the removed Administrative Agent; and
(c) upon the effectiveness of any resignation or removal, the resigning
Administrative Agent or the removed Administrative Agent thereupon will be
discharged from its duties and obligations thereafter arising under the Loan
Documents other than obligations arising as a result of any action or inaction
of the resigning Administrative Agent or the removed Administrative Agent prior
to the effectiveness of such resignation or removal. Notwithstanding the
foregoing, no consent of the Company shall be required under this Section 10.8
in connection with any change in the Administrative Agent at any time when an
Event of Default has occurred and is continuing under this Agreement.

     10.9  No Obligations of Borrowers.  Nothing contained in this Article 10
           ---------------------------                             ----------   
shall be deemed to impose upon the Borrowers any obligation in respect of the
due and punctual performance by the Administrative Agent of its obligations to
the Banks under any provision of this Agreement, and the Borrowers shall have no
liability to the Administrative Agent or any of the Banks in

                                       65
<PAGE>
 
respect of any failure by the Administrative Agent or any Bank to perform any of
its obligations to the Administrative Agent or the Banks under this Agreement.
Without limiting the generality of the foregoing, where any provision of this
Agreement relating to the payment of any amounts due and owing under the Loan
Documents provides that such payments shall be made by a Borrower to the
Administrative Agent for the account of the Banks, such Borrower's obligations
to the Banks in respect of such payments shall be deemed to be satisfied upon
the making of such payments to the Administrative Agent in the manner provided
by this Agreement.

     10.10  Arranger.  The Arranger shall have no duties or obligations under
            --------
the Loan Documents or otherwise in connection with the Loans.

                                  ARTICLE 11
                               COMPANY GUARANTY
                               ----------------

     11.1  The Guaranty.   The Company hereby unconditionally guaranties the due
           ------------
and punctual payment of all obligations (including, without limitation, the
obligation to pay the principal amount of and interest on each Advance) of each
Borrowing Subsidiary arising under this Agreement when due, whether by required
prepayment, declaration, demand or otherwise (including amounts which would
become due but for the operation of the automatic stay under Section 362(a) of
the Bankruptcy Code, 11 U.S.C. (S) 362(a)) (the "Borrowing Subsidiary
                                                 --------------------
Obligations"), and agrees to pay any and all costs and expenses (including fees
- -----------
and disbursements of counsel and allocated costs of internal counsel) incurred
by the Administrative Agent and the Banks in enforcing any rights under this
Article 11. The obligations of the Company under this Article 11, as they may be
amended, modified or supplemented from time to time, are sometimes referred to
in this Article 11 as this "Guaranty".
                            --------

     The Company agrees that this Guaranty constitutes a guaranty of payment
when due and not of collection and waives any right to require that any resort
be had by the Administrative Agent or any Bank to any security held for payment
of the Borrowing Subsidiary Obligations or to any balance of any deposit account
or credit on the books of the Administrative Agent or any Bank in favor of the
Company or any Borrowing Subsidiary or any other Person.

     The Company agrees, in furtherance of the foregoing and not in limitation
of any other right which the Administrative Agent or any Bank may have at law or
in equity against the Company by virtue hereof, upon the failure of any
Borrowing Subsidiary to pay any of its Borrowing Subsidiary Obligations when and
as the same shall become due, whether by required prepayment, declaration,
demand or otherwise (including amounts which would become due but for the
operation of the automatic

                                       66
<PAGE>
 
stay under Section 362(a) of the Bankruptcy Code, 11 U.S.C. (S) 362(a)), the
Company will forthwith pay, or cause to be paid, in cash, to the Administrative
Agent for the ratable benefit of the Banks an amount equal to the sum of the
unpaid principal amount of such Borrowing Subsidiary Obligations then due as
aforesaid, accrued and unpaid interest on such Borrowing Subsidiary Obligations
(including, without limitation, interest which, but for the filing of a petition
in bankruptcy with respect to such Borrowing Subsidiary (including without
limitation, the Company), would accrue on such Borrowing Subsidiary
Obligations).

     11.2  Guaranty Unconditional.  The obligations of the Company under this
           ----------------------
Guaranty shall be unconditional and absolute and, without limiting the
generality of the foregoing, shall not be released, discharged or otherwise
affected by:

          (a) any extension, renewal, settlement, compromise, waiver or release
     in respect of any obligation of any Borrowing Subsidiary under this
     Agreement, by operation of law or otherwise;

          (b) any modification or amendment of or supplement to this Agreement;

          (c) any release, non-perfection or invalidity of any direct or
     indirect security for any obligation of any Borrowing Subsidiary under
     this Agreement;

          (d) the failure of the Administrative Agent or any Bank to assert any
     claim or demand or to enforce any right or remedy against any Borrowing
     Subsidiary, the Company or any other Person under the provisions of this
     Agreement or any other agreement or otherwise;

          (e) any change in the corporate existence, structure or ownership of
     any Borrowing Subsidiary or any insolvency, bankruptcy, reorganization or
     other similar proceeding affecting any Borrowing Subsidiary or its assets
     or any resulting release or discharge of any obligation of any Borrowing
     Subsidiary contained in this Agreement;

          (f) the existence of any claim, set-off or other rights which the
     Company may have at any time against any other Borrower, the Administrative
     Agent, any Bank or any other Person, whether in connection herewith or any
     unrelated transactions;

          (g) the invalidity or unenforceability relating to or against any
     Borrowing Subsidiary for any reason of this Agreement, or any provision of
     applicable law or regulation purporting to prohibit the payment by any
     Borrowing Subsidiary of the principal of or interest on any Advance or any
     other amount payable by any Borrowing Subsidiary under

                                       67
<PAGE>
 
     this Agreement, or the termination of any Borrowing Subsidiary's status as
     a Borrowing Subsidiary hereunder;

          (h) the termination of a Borrowing Subsidiary's status hereunder as a
     "Borrower" pursuant to Section 12.2;
                            ------------

          (i) any other act or omission to act or delay of any kind by any
     Borrowing Subsidiary, the Administrative Agent, any Bank or any other
     Person or any other circumstance whatsoever which might, but for the
     provisions of this paragraph, constitute a legal or equitable discharge of
     the obligations of the Company hereunder.

     The obligations of the Company under this Guaranty shall not be subject to
any reduction, limitation, impairment or termination for any reason, including,
without limitation, any claim of waiver, release, surrender, alteration or
compromise of any of the Borrowing Subsidiary Obligations, and shall not be
subject to any defense or set-off, counterclaim, recoupment or termination
whatsoever by reason of the invalidity, illegality or unenforceability of any of
the Borrowing Subsidiary Obligations, discharge of any Borrowing Subsidiary from
any of the Borrowing Subsidiary Obligations in a bankruptcy or similar
proceeding, or otherwise. Without limiting the generality of the foregoing, the
obligations of the Company under this Guaranty shall not be discharged or
impaired or otherwise affected by the failure of the Administrative Agent or any
Bank to assert any claim or demand or to enforce any remedy under this Agreement
or any document or instrument executed by any Borrowing Subsidiary in connection
herewith, by any waiver or modification of any thereof, by any default, failure
or delay, willful or otherwise, in the performance of the Borrowing Subsidiary
Obligations, or by any other act or thing or omission or delay to do any other
act or thing which may or might in any manner or to any extent vary the risk of
the Company or which would otherwise operate as a discharge of the Company as a
matter of law or equity.

     11.3  Discharge Only Upon Payment in Full; Reinstatement in Certain
           -------------------------------------------------------------
Circumstances.  The obligations of the Company under this Article 11 shall
- -------------
remain in full force and effect until the Commitments shall have terminated, all
Letters of Credit have expired and the principal of and interest on the Advances
and all other amounts payable by the Borrowers under this Agreement shall have
been paid in full.  If at any time any payment of the principal of or interest
on any Advance or any other amount payable by the Borrowers under this Agreement
is rescinded or must be otherwise restored or returned upon the insolvency,
bankruptcy or reorganization of any Borrower or otherwise, the obligations of
the Company under this Article 11 shall be reinstated as though such payment had
                       ----------
been due but not made at such time.

                                       68
<PAGE>
 
     11.4  Waivers by the Company.  With respect to this Article 11, the Company
           ----------------------
hereby waives for the benefit of the Administrative Agent and the Banks:

          (a) any right to require the Administrative Agent or any Bank, as a
     condition of payment or performance by the Company under this Guaranty to
     (i) proceed against any Borrowing Subsidiary, any other guarantor of the
     obligations of any Borrowing Subsidiary under any other agreement or
     guaranty or any other Person, (ii) proceed against or exhaust any security
     held from any Borrowing Subsidiary, any other guarantor or any other
     Person, or (iii) pursue any other remedy in the power of the Administrative
     Agent or any Bank whatsoever;

          (b) any defense arising by reason of the incapacity, lack of authority
     or any disability or other defense of any Borrowing Subsidiary including,
     without limitation, any defense based on or arising out of the lack of
     validity or unenforceability of the Borrowing Subsidiary Obligations or any
     agreement or instrument relating thereto or by reason of the cessation from
     any cause of the liability of any Borrowing Subsidiary other than
     indefeasible payment in full of the Borrowing Subsidiary Obligations;

          (c) any defense based upon any statute or rule of law which provides
     that the obligation of a surety must be neither larger in amount nor in
     other respects more burdensome than that of the principal, or based upon
     the Administrative Agent's or any Bank's errors or omissions in the
     administration of the Borrowing Subsidiary Obligations, except behavior
                                                             ------
     which amounts to bad faith;

          (d) any (i) principles or provisions of law, statutory or otherwise,
     which are or might be in conflict with the terms of this Guaranty, any
     legal or equitable discharge of its obligations hereunder and the benefit
     of any statute of limitations affecting its liability hereunder or the
     enforcement thereof, (ii) rights to set-offs, recoupments and
     counterclaims, (iii) rights to deferral or modification of the Company's
     obligations hereunder by reason of any bankruptcy, reorganization,
     arrangement, moratorium or other debtor relief proceeding, (iv) promptness,
     diligence and any requirement that the Administrative Agent or any Bank
     protect, secure, perfect or insure any security interest or lien or any
     property subject thereto or exhaust any right or take any action against
     any Borrowing Subsidiary or any other Person or any collateral;

          (e) notice, demand, presentment, protests, notices of protest, notices
     of dishonor and notices of any action or inaction, including acceptance of
     this Guaranty, notices of default under this Agreement or any agreement or
     instrument related thereto, notice of any renewal, extension or

                                       69
<PAGE>
 
     modification of the Borrowing Subsidiary Obligations or any agreement
     related thereto, notice of any other extension of credit to any Borrowing
     Subsidiary; and

          (f) any defenses or benefits that may be derived from or afforded by
     law which limit the liability of or exonerates guarantors or sureties, or
     which may conflict with the terms of this Guaranty including, without
     limitation, the provisions of California Civil Code Sections 2809, 2810,
     2819, 2839, 2845, 2846, 2847, 2848, 2849, 2850, 2899 and 3433.

     11.5  Subrogation, Etc.  Upon payment by the Company of any sum to the
           ----------------
Administrative Agent for the ratable benefit of any Bank as provided above, so
long as any of the Borrowing Subsidiary Obligations of a Borrowing Subsidiary
shall remain outstanding hereunder, all rights of the Company against such
Borrowing Subsidiary arising as a result thereof, by way of right of subrogation
or otherwise, shall in all respects be subordinate and junior in right of
payment to the prior indefeasible payment in full of all the Borrowing
Subsidiary Obligations of that Borrowing Subsidiary to the Administrative Agent
and the Banks. In furtherance of the foregoing, and not in limitation thereof,
the Company agrees that until the Borrowing Subsidiary Obligations of a
Borrowing Subsidiary shall have been paid in full, the Commitment has terminated
and all Letters of Credit issued for the account of such Borrowing Subsidiary
have expired, the Company shall withhold exercise of any right of subrogation,
or any right to enforce any remedy which the Administrative Agent or any Bank
may have against that Borrowing Subsidiary. If any amount shall be paid to the
Company on account of such subrogation rights at any time prior to the date when
the Borrowing Subsidiary Obligations of such Borrowing Subsidiary have been paid
in full, the Commitment has terminated and all Letters of Credit issued for the
account of such Borrowing Subsidiary have expired, such amount shall be held in
trust for the benefit of the Banks and shall be paid to the Administrative Agent
for the benefit of the Banks to be credited and applied upon the Borrowing
Subsidiary Obligations of such Borrowing Subsidiary, whether matured or
unmatured, in accordance with the terms of the Credit Agreement or to be held by
the Administrative Agent for the benefit of the Banks as collateral security for
any Obligations thereafter existing.

                                  ARTICLE 12
                ADDITIONAL BORROWERS; TERMINATION OF BORROWERS
                ----------------------------------------------

     12.1  Agreement to Participate. Any Eligible Subsidiary may become a party
           ------------------------
to this Agreement and become a "Borrower" for all purposes hereof on any date
after the date hereof upon the satisfaction of the following conditions:

                                       70
<PAGE>
 
          (a) receipt by the Administrative Agent on or before such date of an
     Agreement to Participate executed by such Eligible Subsidiary and
     acknowledged and consented to by the Administrative Agent and the Company;

          (b) receipt by the Administrative Agent of a certificate dated such
     date from the senior financial officer of such Eligible Subsidiary to the
     effect that (i) no Default has occurred and is continuing on such date,
     (ii) the representations and warranties of such Eligible Subsidiary and its
     Subsidiaries contained in the Agreement to Participate executed by such
     Eligible Subsidiary are true, correct and complete on and as of such date,
     and (iii) such Eligible Subsidiary is a wholly-owned Subsidiary set forth
     in Schedule 1.2 have been satisfied;
        ------------

          (c) receipt by the Administrative Agent on or before such date of such
     additional documents it may reasonably request relating to the existence of
     such Eligible Subsidiary, the corporate power and authority of such
     Eligible Subsidiary, the validity of such Eligible Subsidiary's obligations
     under the Agreement to Participate executed by such Eligible Subsidiary and
     under this Agreement, and other matters relevant thereto and hereto, all in
     form and substance satisfactory to the Administrative Agent; and

          (d) receipt by the Administrative Agent on or before such date of the
     Committed Advance Notes dated such date and executed by such Eligible
     Subsidiary, one Note in favor of each Bank in a principal amount equal to
     that Bank's Pro Rata Share of the Commitment, and the Competitive Advance
     Notes dated such date and executed by such Eligible Subsidiary in favor of
     each Bank, each in the principal amount of Commitment.

     Each Bank hereby authorizes the Administrative Agent to sign on such Bank's
behalf an Agreement to Participate delivered pursuant to clause (a) above, and
the Company and each Bank hereby agree that, upon satisfaction by any Eligible
Subsidiary of the conditions set forth in the preceding clauses (a), (b) and
(c), such Eligible Subsidiary shall become a "Borrower" hereunder for all
purposes hereof. The Administrative Agent shall promptly notify the Banks of
whenever an Eligible Subsidiary becomes a Borrower.

     12.2  Notice of Termination.  Any Borrower, other than the Company, that
           ---------------------
has no Advances outstanding to any Bank and is not the account party on any
Letter of Credit, may cease to be a "Borrower" for the purposes of this
Agreement (and all commitments as to such Borrower shall thereupon terminate)
upon notice, in form and substance satisfactory to the Administrative Agent, by
such Borrower to the Administrative Agent; provided that such notice shall not
                                           --------
affect any obligation of such Borrower

                                       71
<PAGE>
 
theretofore incurred. The Administrative Agent shall send prompt written notice
to each Bank of any Borrower ceasing, pursuant to this subsection, to be a
Borrower.

                                  ARTICLE 13
                                 MISCELLANEOUS
                                 -------------

     13.1  Cumulative Remedies; No Waiver. The rights, powers, privileges and
           ------------------------------
remedies of the Administrative Agent, the Issuing Bank and the Banks provided
herein or in any Note or other Loan Document are cumulative and not exclusive of
any right, power, privilege or remedy provided by Law or equity. No failure or
delay on the part of the Administrative Agent, the Issuing Bank or any Bank in
exercising any right, power, privilege or remedy may be, or may be deemed to be,
a waiver thereof; nor may any single or partial exercise of any right, power,
privilege or remedy preclude any other or further exercise of the same or any
other right, power, privilege or remedy. The terms and conditions of Article 8
                                                                     ---------
hereof are inserted for the sole benefit of the Administrative Agent, the
Issuing Bank and the Banks; the same may be waived in whole or in part, with or
without terms or conditions, in respect of any Loan, Competitive Advance or
Letter of Credit without prejudicing the Administrative Agent's, either Issuing
Bank's or the Banks' rights to assert them in whole or in part in respect of any
other Loan, Competitive Advance or Letter of Credit.

     13.2  Amendments; Consents.  No amendment, modification, supplement,
           --------------------
extension, termination or waiver of any provision of this Agreement or any other
Loan Document, no approval or consent thereunder, and no consent to any
departure by any Borrower or any other party therefrom, may in any event be
effective unless the same shall be in writing and signed by the Majority Banks
(or signed by the Administrative Agent at the direction of the Majority Banks)
(and, in the case of amendments, modifications or supplements of or to any Loan
Document to which a Borrower is a party, the approval in writing of such
Borrower), and then only in the specific instance and for the specific purpose
given; and, without the approval in writing of all the Banks, no amendment,
modification, supplement, termination, waiver or consent may be effective:

          (a) To extend the final maturity of any Loan or Note beyond the
     Maturity Date, or reduce the rate of interest (other than any waiver of any
     increase in the interest rate applicable to any of the Loans pursuant to
     Section 3.9) or fees in respect of the Commitment, the Loans or the Letters
     of Credit, or extend the time of payment of interest or fees in respect
     thereof, or reduce the principal amount of the Obligations;

                                       72
<PAGE>
 
          (b) To amend or modify the provisions of the definitions of
     "Commitment", "Maturity Date", or "Majority Banks"; or this Section;
      ----------    -------------       --------------

          (c)  To release any guarantor; or

          (d) To amend or modify any provision of this Agreement that expressly
     requires the consent or approval of all the Banks.

In addition, no amendment, modification, supplement, termination, waiver or
consent shall, unless in writing and signed by the Administrative Agent in
addition to the Banks required above to take such action, affect the rights or
duties of the Administrative Agent acting in such capacity under this Agreement
or any Note.  No amendment, modification, supplement, termination, waiver or
consent shall, unless in writing and signed by the Issuing Bank, affect any
provisions hereof relating to the Letters of Credit.  Any amendment,
modification, supplement, termination, waiver or consent pursuant to this
Section shall apply equally to, and shall be binding upon, all the Banks, the
Issuing Bank, the Administrative Agent and each Borrower.  Copies of all
amendments, modifications, supplements, terminations, waivers and consents shall
be distributed to the Administrative Agent, each Bank, the Issuing Bank and each
Borrower.

     13.3  Costs, Expenses and Taxes.  The Company shall pay on demand the
           -------------------------
reasonable costs and expenses (a) of the Arranger and the Administrative Agent
in connection with the negotiation, preparation, execution and delivery of the
Loan Documents (including, without limitation, the reasonable legal fees and 
out-of-pocket expenses of O'Melveny & Myers LLP), and, (b) if a Borrower
requests the amendment, waiver, supplement or modification the Loan Documents,
of the Administrative Agent and the Issuing Bank in connection with any such
amendment, waiver, supplement or modification, and (c) if any Default has
occurred, of the Administrative Agent, the Issuing Bank and the Banks in
connection with any workout, restructuring, reorganization (including a
                                                            ---------
bankruptcy reorganization) and in any event enforcement or attempted enforcement
of the Loan Documents, and any matter related thereto, including, without
                                                       ---------
limitation, out-of-pocket expenses and the reasonable fees and out-of-pocket
expenses of any legal counsel, independent public accountants and other outside
experts retained by the Administrative Agent, the Issuing Bank or any Bank, and
including, without limitation, any costs, expenses or fees incurred or suffered
- ---------
by the Administrative Agent, the Issuing Bank or any Bank in connection with or
during the course of any bankruptcy or insolvency proceedings of the Company or
any Subsidiary thereof. The Company shall pay any and all documentary and other
taxes (other than income or gross receipts taxes generally applicable to banks)
and all costs, expenses, fees and charges payable or determined to be payable in
connection with the filing or

                                       73
<PAGE>
 
recording of this Agreement, any other Loan Document or any other instrument or
writing to be delivered hereunder or thereunder, or in connection with any
transaction pursuant hereto or thereto, and shall reimburse, hold harmless and
indemnify the Arranger, the Administrative Agent, the Issuing Bank and the Banks
from and against any and all loss, liability or legal or other expense with
respect to or resulting from any delay in paying or failure to pay any tax,
cost, expense, fee or charge or that any of them may suffer or incur by reason
of the failure of any party (other than the Arranger, the Administrative Agent,
the Issuing Bank or any Bank) to perform any of its Obligations.

     13.4  Obligation to Make Payments in Dollars. The obligation of the
           --------------------------------------
Borrowers to make payments in dollars of the principal and interest becoming due
and payable on each Loan and each Competitive Advance, and to pay all other
Obligations hereunder, (i) shall not be discharged or satisfied by any tender,
or any recovery pursuant to any judgment, which is expressed in or converted
into any currency other than dollars, except to the extent that such tender or
recovery shall result in the actual receipt by the Administrative Agent, the
Banks and the Issuing Bank of the full amount of dollars expressed to be payable
in respect of the principal and interest of each Loan and each Competitive
Advance and in respect of each other Obligation, (ii) shall be enforceable as an
alternative or additional cause of action for the purpose of recovering in
dollars the amount, if any, by which such actual receipt shall fall short of the
full amount of dollars so expressed to be payable and (c) shall not be affected
by judgment being obtained for any other sum due under this Agreement.

     13.5  Nature of Banks' Obligations.  The obligations of the Banks hereunder
           ----------------------------
are several and not joint or joint and several. Nothing contained in this
Agreement or any other Loan Document and no action taken by the Administrative
Agent, the Issuing Bank or the Banks or any of them pursuant hereto or thereto
may, or may be deemed to, make the Banks a partnership, an association, a joint
venture or other entity, either among themselves or with the Company or any
Affiliate of the Company. Each Bank's obligation to make any Advance pursuant
hereto is several and not joint or joint and several, and is not conditioned
upon the performance by all other Banks of their obligations to make Advances.
If any Bank defaults in its obligation to make any Advance to a Borrower after
the fulfillment of all conditions precedent to that Advance, then the Company
may terminate this Agreement with respect to that Bank upon fulfillment of each
of the following conditions:

          (i) the Borrower shall have paid to the affected Bank the principal
     amount of all outstanding Advances made by that Bank, together with all
     accrued but unpaid interest, costs, fees and expenses related thereto; and

                                       74
<PAGE>
 
          (ii) the Company shall have notified the Administrative Agent and
     each of the Banks of the termination.

A default by any Bank will not increase the amount of the Commitment
attributable to any other Bank, and any Bank not in default may, if it desires,
assume in such proportion as the nondefaulting Banks agree the obligations of
any Bank in default, but is not obligated to do so.  Should the Company elect,
as aforesaid, to terminate this Agreement with respect to any Bank, then the
Commitment shall automatically be reduced by a percentage equal to the Pro Rata
Share of the Commitment of the affected Bank, and the remaining Bank or Banks
shall have that Pro Rata Share in the reduced Commitment which is allocable to
their Advances.

     13.6  Survival.  All representations and warranties contained herein or in
           --------
any other Loan Document, or in any certificate or other writing delivered by or
on behalf of any one or more of the Parties to any Loan Document, will survive
the making of the Advances hereunder and the execution and delivery of the
Notes, and have been or will be relied upon by the Administrative Agent, the
Issuing Bank and each Bank, notwithstanding any investigation made by the
Administrative Agent, the Issuing Bank or any Bank or on their behalf. The
obligations of the Company under Sections 3.7 and 3.8 shall survive for thirty
                                 ------------     ---
(30) days following the termination of this Agreement and the repayment of the
Notes.

     13.7  Notices.  All notices, requests, demands, directions and other
           -------
communications to the Issuing Bank provided for hereunder or under any other
Loan Document must be in writing and must be mailed, telegraphed, telecopied or
delivered to: John Williams, Citibank, N.A., Two Penns Way, Suite 200, New
Castle, DE 19720 with a copy to Deborah Ironson, Citicorp Securities, Inc., 787
West Fifth Street, 29th Floor, Los Angeles, CA  90071.  All notices, requests,
demands, and other communications to the Administration Agent provided for
hereunder or under any other Loan Document must be mailed, telegraphed,
telecopied or delivered to: Citibank, N.A., 399 Park Avenue, New York, New York
10043 with a copy to Deborah Ironson, Citibank Securities, Inc., 787 West Fifth
Street, 29th Floor, Los Angeles, CA  90071.  Except as otherwise expressly
                                             ------
provided in the Loan Documents, all notices, requests, demands, directions and
other communications provided for hereunder or under any other Loan Document
must be in writing and must be mailed, telegraphed, telecopied or delivered to
the appropriate party at the address set forth on the signature pages of this
Agreement or other applicable Loan Document or, as to any party to any Loan
Document, at any other address as may be designated by it in a written notice
sent to all other parties to such Loan Document in accordance with this Section.
Except as otherwise expressly provided in any Loan Document, if any notice,
- ------
request, demand, direction or other communication required or permitted by any
Loan Document is given by mail it will be effective on the earlier of receipt or
the

                                       75
<PAGE>
 
fifth calendar day after deposit in the United States mail with first class
or airmail postage prepaid; if given by telegraph or cable, when delivered to
the telegraph company with charges prepaid; if given by telecopier, when sent;
or if given by personal delivery, when delivered.

     13.8  Execution of Loan Documents.  Unless the Administrative Agent
           ---------------------------
otherwise specifies with respect to any Loan Document, this Agreement and any
other Loan Document may be executed in any number of counterparts and any party
hereto or thereto may execute any counterpart, each of which when executed and
delivered will be deemed to be an original and all of which counterparts of this
Agreement or any other Loan Document, as the case may be, when taken together
will be deemed to be but one and the same instrument. The execution of this
Agreement or any other Loan Document by any party hereto or thereto will not
become effective until counterparts hereof or thereof, as the case may be, have
been executed by all the parties hereto or thereto.

     13.9  Binding Effect; Assignment. This Agreement and the other Loan
           --------------------------
Documents shall be binding upon and shall inure to the benefit of the parties
hereto and thereto and their respective successors and assigns, except that a
                                                                ------
Borrower and/or its Affiliates may not assign their rights hereunder or
thereunder or any interest herein or therein without the prior written consent
of all the Banks. Each Bank shall have the right in accordance with this Section
to sell, assign, pledge or transfer all or any portion of its rights hereunder
or under the Note of that Bank and to grant any participation or other interest
herein or therein; provided that no such sale, assignment, pledge, transfer or
                   --------
participation grant shall make any assignment which would have the effect of
result in requiring registration under the Securities Act of 1933, as amended,
or qualification under any state securities laws. Each Bank represents that it
is not acquiring the Notes with a view to the distribution thereof within the
meaning of the Securities Act of 1933, as amended (subject to any requirement
that disposition of the Notes must be within the control of such Bank). Any Bank
may assign, from time to time, any or all of its rights and obligations
hereunder and all or any portion of its share of the Commitments to an Affiliate
of that Bank or, with the approval of the Company (which approval will not be
unreasonably withheld), to any other financial institution acceptable to the
Administrative Agent, subject to the assumption by the assignee of the share of
the Commitments so assigned. Any assignment shall also require the consent of
the Issuing Bank, such consent not to be unreasonably withheld. Any such
assignment shall be evidenced by an Assignment Agreement substantially in the
form of Exhibit J, executed by each of the parties and a copy of which shall be
delivered to the Administrative Agent. Upon such execution and delivery, from
and after the effective date specified in each Assignment Agreement (y) the
assignee thereunder shall be a party hereto and, to the extent that rights

                                       76
<PAGE>
 
and obligations hereunder have been assigned to it pursuant to such Assignment
Agreement, have the rights and obligations of a Bank hereunder and (z) the Bank
assignor thereunder shall, to the extent that rights and obligations hereunder
have been assigned by it pursuant to such Assignment Agreement, relinquish its
rights and be released from its obligations under this Agreement (and, in the
case of an Assignment Agreement covering all or the remaining portion of an
assigning Bank's rights and obligations under this Agreement, such Bank shall
cease to be a party hereto). The Pro Rata Share of each Bank of the Commitments
hereunder shall be modified to reflect the Pro Rata Share of the Commitment of
such assignee and, if any such assignment occurs while any Loan is outstanding
new Notes shall, upon surrender of the assigning Bank's Notes, be issued to such
assignee and to the assigning Bank as necessary to reflect the new Pro Rata
Share of the Commitments of the Bank and of assignee. Notwithstanding any other
provision set forth in this Agreement, any Bank may assign or pledge, as
collateral or otherwise, all or any portion of its rights under this Agreement
(including without limitation, rights to payments of principal and/or interest
under the Notes held by it), but not its obligations, to any Federal Reserve
Bank or any Affiliate in order that such Affiliate may assign or pledge such
rights to any Federal Reserve Bank, in each case, without notice to or consent
from any Borrower or the Administrative Agent; provided, however, that such
                                               --------  -------
Federal Reserve Bank or Affiliate shall not, by reason of such assignment,
become a "Bank" hereunder for any purpose whatsoever and any such Bank shall not
be released from any of its obligations hereunder as a result of such assignment
or pledge. Any Bank may grant, from time to time, a participation interest in
the rights of that Bank under its Note and this Agreement to any financial
institution, without notice to or the approval of the Administrative Agent or
the Borrowers. The grant of such a participation interest shall be on such terms
as the granting Bank determines are appropriate, provided only that (a) such
Bank's rights and obligations under this Agreement (including, without
limitation, its Commitment) shall remain unchanged, (b) such Bank shall remain
solely responsible to the other parties hereto for the performance of such
obligations, (c) such Bank shall remain the holder of any such Note for all
purposes of the Agreement, (d) the Borrowers, the Administrative Agent and the
other Banks shall continue to deal solely and directly with such Bank in
connection with such Bank's rights and obligations under this Agreement, (e) no
participant under any such participation shall have any right to approve any
amendment or waiver of any provision of any Loan Document, or any consent to any
departure by any Borrower therefrom, except to the extent that such amendment,
waiver or consent would reduce the principal of, or interest (other than
increased interest following default pursuant to Section 3.9) on, the Notes or
any fees or other amounts payable hereunder, in each case to the extent subject
to such participation, postpone the Maturity Date, or date fixed for payment of
interest on, the Notes or any fees or other amounts payable hereunder, in each
case to the extent subject to such participation, or release the

                                       77
<PAGE>
 
Company from its Obligations under Article 11 hereof, and (f) no Borrower
shall be subject to any increased liability to any Bank pursuant to this
Agreement by virtue of such participation.  No participant shall constitute a
"Bank" under this Agreement or any Loan Document, and the Borrowers shall
continue to deal solely and directly with the Administrative Agent and the
Banks.

      13.10  Setoff Rights.  If an Event of Default has occurred and is
             ------------- 
continuing, the Administrative Agent, the Issuing Bank and each Bank (but only
with the consent of the Majority Banks) is hereby authorized to the fullest
extent permitted by law to setoff and apply any funds in any deposit account
maintained with it by any Borrower and/or any Property of any Borrower in its
possession against the Obligations.

      13.11  Sharing of Setoffs.  Each Bank severally agrees that if it, through
             ------------------
the exercise of any right of setoff, banker's lien or counterclaim against any
Borrower, or otherwise, receives payment, through any means, of the Obligations
held by it that is in excess of that Bank's proportionate share of the Total
Outstandings as applied to such payment, then: (a) The Bank exercising the right
of setoff, banker's lien or counterclaim or otherwise receiving such payment
shall purchase, and shall be deemed to have simultaneously purchased, from the
other Bank a participation in the Obligations held by the other Bank and shall
pay to the other Bank a purchase price in an amount so that the share of the
Obligations held by each Bank after the exercise of the right of setoff,
banker's lien or counterclaim or receipt of payment shall be in the same
proportion that existed prior to the exercise of the right of setoff, banker's
lien or counterclaim or receipt of payment; and (b) such other adjustments and
purchases of participations shall be made from time to time as shall be
equitable to ensure that all of the Banks share any payment obtained in respect
of the Obligations ratably in accordance with each Bank's share of the
Obligations immediately prior to, and without taking into account, the payment;
provided that, if all or any portion of a disproportionate payment obtained as a
- --------
result of the exercise of the right of setoff, banker's lien, counterclaim or
otherwise is thereafter recovered from the purchasing Bank by any Borrower or
any Person claiming through or succeeding to the rights of any Borrower, the
purchase of a participation shall be rescinded and the purchase price thereof
shall be restored to the extent of the recovery, but without interest. Each Bank
that purchases a participation in the Obligations pursuant to this Section shall
from and after the purchase have the right to give all notices, requests,
demands, directions and other communications under this Agreement with respect
to the portion of the Obligations purchased to the same extent as though the
purchasing Bank were the original owner of the Obligations purchased. Each
Borrower expressly consents to the foregoing arrangements and agrees that any
Bank holding a participation in an Obligation so purchased may exercise any and
all rights of setoff, banker's lien or counterclaim with respect to the
participation as fully as if the Bank were the original

                                       78
<PAGE>
 
owner of the Obligation purchased; provided, however, that each Bank agrees that
                                   --------  -------
it shall not exercise any right of set off, banker's lien or counterclaim
without first obtaining the consent of the Majority Banks.

     13.12  Indemnity by the Company.  The Company agrees to indemnify, save and
            ------------------------
hold harmless each Arranger, the Issuing Bank, the Administrative Agent and each
Bank and their Affiliates, directors, officers, agents, attorneys, advisors and
employees (collectively the "Indemnitees") from and against: (a) any and all
                             -----------
claims, demands, actions or causes of action if the claim, demand, action or
cause of action arises out of or relates to the Commitment, the use or
contemplated use of proceeds of any Advance, any drawing under any Letter of
Credit, any transaction contemplated by this Agreement, or any relationship or
relationship alleged to exist by any Borrower, its Affiliates or any other third
party of any Indemnitee to any Borrower related to this Agreement; (b) any
administrative or investigative proceeding by any Governmental Agency arising
out of or related to a claim, demand, action or cause of action described in
clause (a) above; and (c) any and all liabilities, losses, costs or expenses
(including attorneys' fees and disbursements and other professional services)
 ---------
that any Indemnitee suffers or incurs as a result of the assertion of any
foregoing claim, demand, action or cause of action; provided that no Indemnitee
                                                    --------
shall be entitled to indemnification for any loss caused by its own gross
negligence or willful misconduct. If any claim, demand, action or cause of
action is asserted against any Indemnitee, such Indemnitee shall promptly notify
the Company, but the failure to so promptly notify the Company shall not affect
the Company's obligations under this Section unless such failure materially
prejudices the Company's right to participate in the contest of such claim,
demand, action or cause of action, as hereinafter provided. If requested by the
Company in writing, such Indemnitee shall in good faith contest the validity,
applicability and amount of such claim, demand, action or cause of action and
shall permit the Company to participate in such contest. Any Indemnitee that
proposes to settle or compromise any claim or proceeding for which the Company
may be liable for payment of indemnity hereunder shall give the Company written
notice of the terms of such proposed settlement or compromise reasonably in
advance of settling or compromising such claim or proceeding and shall obtain
the Company's prior consent. In connection with any claim, demand, action or
cause of action covered by this Section against more than one Indemnitee, all
such Indemnitees shall be represented by the same legal counsel selected by the
Indemnitees and reasonably acceptable to the Company; provided that, if such
                                                      --------
legal counsel determines in good faith that representing all such Indemnitees
would or could result in a conflict of interest under Laws or ethical principles
applicable to such legal counsel or that a defense or counterclaim is available
to an Indemnitee that is not available to all such Indemnitees, then to the
extent reasonably necessary to avoid such a conflict of interest or to permit
unqualified assertion of such a defense or counterclaim,

                                       79
<PAGE>
 
each Indemnitee shall be entitled to separate representation by legal counsel
selected by that Indemnitee and reasonably acceptable to the Company, with all
such legal counsel using reasonable efforts to avoid unnecessary duplication of
effort by counsel for all Indemnitees; provided further that the amount of the
                                       --------
legal fees to be reimbursed by the Company shall be limited to an amount
reasonably determined following consultation among the Company, the
Administrative Agent, the Banks and their respective legal counsel, to be equal
to the amount that would have been expended if the Indemnitees have been
represented by one counsel. Any obligation or liability of the Company to any
Indemnitee under this Section shall survive the expiration or termination of
this Agreement and the repayment of all Advances and the payment and performance
of all other Obligations owed to the Banks.

     13.13  No Third Parties Benefited.  This Agreement is made for the purpose
            --------------------------
of defining and setting forth certain obligations, rights and duties of the
Borrowers, the Administrative Agent, the Issuing Bank and the Banks in
connection with the Loans, Advances and Letters of Credit, and is made for the
sole benefit of the Borrowers, the Administrative Agent, the Issuing Bank and
the Banks, and the Administrative Agent's, the Issuing Bank's and the Banks'
successors and assigns. Except as provided in Sections 13.8 and 13.11, no other
                        ------                -------------     -----
Person shall have any rights of any nature hereunder or by reason hereof.

     13.14  Confidentiality.  Each of the Administrative Agent, the Issuing Bank
            ---------------
and each Bank agrees to hold any confidential information that it may receive
from any Borrower pursuant to this Agreement in confidence: except for
                                                            ------
disclosure: (a) to other Banks; (b) to legal counsel, accountants and other
professional advisors to any Borrower or the Administrative Agent, the Issuing
Bank or any Bank; (c) to regulatory officials having jurisdiction over the
Administrative Agent, the Issuing Bank or a Bank; (d) as required by Law or
legal process or in connection with any legal proceeding to which the
Administrative Agent, the Issuing Bank or a Bank and that Borrower are adverse
parties; (e) to Affiliates of the Administrative Agent by the Administrative
Agent and (f) to Affiliates of a Bank or to another financial institution, in
each case, in connection with a disposition or proposed disposition to that
financial institution of all or part of that Bank's interests hereunder or a
participation interest in its Note, provided that such disclosure is made
                                    --------
subject to an appropriate confidentiality agreement on terms substantially
similar to this Section. For purposes of the foregoing, "confidential
information" shall mean any information respecting the Company or its
Subsidiaries reasonably considered by the Company to be confidential, other than
                                                                      ----------
(i) information previously filed with any Governmental Agency and available to
the public, (ii) information previously published in any public medium from a
source other than, directly or indirectly, that Bank, and (iii) information
previously disclosed by a Borrower to

                                       80
<PAGE>
 
any Person not associated with that Borrower without a written confidentiality
agreement substantially similar to this Section. Nothing in this Section shall
be construed to create or give rise to any fiduciary duty on the part of the
Administrative Agent, the Issuing Bank or the Banks to the Borrowers.

     13.15  Further Assurances.  The Company and its Subsidiaries shall, at
            ------------------ 
their expense and without expense to the Banks, the Issuing Bank or the
Administrative Agent, do, execute and deliver such further acts and documents as
any Bank, the Issuing Bank or the Administrative Agent from time to time
reasonably requires for the assuring and confirming unto the Banks, the Issuing
Bank or the Administrative Agent of the rights hereby created or intended now or
hereafter so to be, or for carrying out the intention or facilitating the
performance of the terms of any Loan Document.

     13.16  Removal of Bank.  As of the date any Bank is removed at the request
            ---------------
of the Company, whether pursuant to Section 3.7, Section 3.8 or otherwise, (i)
all obligations of such Bank under this Agreement shall be released and
terminated and (ii) such Bank's Pro Rata Share of the Commitment shall be
terminated, including such Bank's participation in any Letter of Credit. The
removal of any such Bank shall be subject to the satisfaction of the following
conditions:

          (a) The Company shall compensate any such Bank so replaced for (i) any
     breakage costs incurred due to the removal of such Bank, as determined by
     such Bank in good faith, and (ii) all accrued interest and fees owing to
     such Bank pursuant to this Agreement as of the date such Bank is so
     replaced; and

          (b) Such Bank shall receive payment of principal of all Advances made
     to any Borrower hereunder.

     13.17  Integration.  This Agreement, together with the other Loan
            -----------
Documents, comprises the complete and integrated agreement of the parties on the
subject matter hereof and supersedes all prior agreements, written or oral, on
the subject matter hereof. In the event of any conflict between the provisions
of this Agreement and those of any other Loan Document, the provisions of this
Agreement shall control and govern; provided that the inclusion of supplemental
                                    --------
rights or remedies in favor of the Administrative Agent, the Issuing Bank or the
Banks in any other Loan Document shall not be deemed a conflict with this
Agreement. Each Loan Document was drafted with the joint participation of the
respective parties thereto and shall be construed neither against nor in favor
of any party, but rather in accordance with the fair meaning thereof.

     13.18  Severability of Provisions.  Any provision in any Loan Document that
            --------------------------
is held to be inoperative, unenforceable or invalid as to any party or in any
jurisdiction shall, as to

                                       81
<PAGE>
 
that party or jurisdiction, be inoperative, unenforceable or invalid without
affecting the remaining provisions or the operation, enforceability or validity
of that provision as to any other party or in any other jurisdiction, and to
this end the provisions of all Loan Documents are declared to be severable.

     13.19  Independent Covenants.  Each covenant in Articles 5, 6 and 7 is
            ---------------------                    -------- -  -     -
independent of the other covenants in those Articles; the breach of any such
covenant shall not be excused by the fact that the circumstances underlying such
breach would be permitted by another such covenant.

     13.20  Headings.  Article and Section headings in this Agreement and the
            --------
other Loan Documents are included for convenience of reference only and are not
part of this Agreement or the other Loan Documents for any other purpose.

     13.21  Time of the Essence.  Time is of the essence of the Loan Documents.
            -------------------

     13.22  Applicable Law.  THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF
            --------------
THE PARTIES HEREUNDER SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED
IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF CALIFORNIA (INCLUDING
SECTION 1646.5 OF THE CIVIL CODE OF THE STATE OF CALIFORNIA) WITHOUT REGARD TO
CONFLICTS OF LAWS PRINCIPLES.

     13.23  Consent to Jurisdiction and Service of Process. ALL JUDICIAL
            ----------------------------------------------
PROCEEDINGS BROUGHT AGAINST THE BORROWERS ARISING OUT OF OR RELATING TO THIS
AGREEMENT OR ANY OTHER LOAN DOCUMENT, OR ANY OBLIGATIONS THEREUNDER, MAY BE
BROUGHT IN ANY STATE OR FEDERAL COURT OF COMPETENT JURISDICTION IN THE STATE OF
CALIFORNIA, COUNTY AND CITY OF LOS ANGELES, BY EXECUTING AND DELIVERING THIS
AGREEMENT, EACH BORROWER, FOR ITSELF AND IN CONNECTION WITH ITS PROPERTIES,
IRREVOCABLY

           (I) ACCEPTS GENERALLY AND UNCONDITIONALLY THE NONEXCLUSIVE
     JURISDICTION AND VENUE OF SUCH COURTS;

           (II) WAIVES ANY DEFENSE OF FORUM NON CONVENIENS;

           (III) AGREES THAT SERVICE OF ALL PROCESS IN ANY SUCH PROCEEDING IN
     ANY SUCH COURT MAY BE MADE BY REGISTERED OR CERTIFIED MAIL, RETURN RECEIPT
     REQUESTED, TO THE COMPANY AND ITS ADDRESS PROVIDED IN ACCORDANCE WITH
     SUBSECTION 13.6;

           (IV) AGREES THAT SERVICE AS PROVIDED IN CLAUSE (III) ABOVE IS
     SUFFICIENT TO CONFER PERSONAL JURISDICTION OVER SUCH BORROWER IN ANY SUCH
     PROCEEDING IN ANY SUCH COURT, AND OTHERWISE CONSTITUTES EFFECTIVE AND
     BINDING SERVICE IN EVERY RESPECT;

           (V) AGREES THAT THE ADMINISTRATIVE AGENT, THE BANKS, AND THE ISSUING
     BANK RETAIN THE RIGHT TO SERVE

                                       82
<PAGE>
 
     PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO BRING PROCEEDINGS
     AGAINST SUCH BORROWER IN THE COURTS OF ANY OTHER JURISDICTION; AND

           (VI)  AGREES THAT THE PROVISIONS OF THIS SUBSECTION 13.24 RELATING TO
     JURISDICTION AND VENUE SHALL BE BINDING AND ENFORCEABLE TO THE FULLEST
     EXTENT PERMISSIBLE UNDER CALIFORNIA CODE OF CIVIL PROCEDURE SECTION 410.40.

     13.24  Waiver of Jury Trial. EACH OF THE PARTIES TO THIS AGREEMENT HEREBY
            --------------------
AGREES TO WAIVE ITS RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF THIS AGREEMENT OR ANY OF THE OTHER LOAN
DOCUMENTS OR ANY DEALINGS BETWEEN THEM RELATING TO THE SUBJECT MATTER OF THIS
LOAN TRANSACTION OR THE LENDER/BORROWER RELATIONSHIP THAT IS BEING ESTABLISHED.
The scope of this waiver is intended to be all-encompassing of any and all
disputes that may be filed in any court and that relate to the subject matter of
this transaction, including contract claims, tort claims, breach of duty claims
and all other common law and statutory claims. Each party hereto acknowledges
that this waiver is a material inducement to enter into a business relationship,
that each has already relied on this waiver in entering into this Agreement, and
that each will continue to rely on this waiver in their related future dealings.
Each party hereto further warrants and represents that it has reviewed this
waiver with its legal counsel and that it knowingly and voluntarily waives its
jury trial rights following consultation with legal counsel. THIS WAIVER IS
IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER ORALLY OR IN WRITING
(OTHER THAN BY A MUTUAL WRITTEN WAIVER SPECIFICALLY REFERRING TO THIS SUBSECTION
13.25 AND EXECUTED BY EACH OF THE PARTIES HERETO), AND THIS WAIVER SHALL APPLY
TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS
AGREEMENT OR ANY OF THE OTHER LOAN DOCUMENTS OR TO ANY OTHER DOCUMENTS OR
AGREEMENTS RELATING TO THE LOANS MADE HEREUNDER. In the event of litigation,
this Agreement may be filed as a written consent to a trial by the court.

                                       83
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the date first above written.

                                      THE COMPANY:

                                      AMGEN INC.

                                      By:  /s/ Kathryn E. Falberg
                                         ------------------------------       
                                             Kathryn E. Falberg

                                      Title: Vice President, Finance,
                                             Chief Financial Officer and
                                             Chief Accounting Officer 

                                      Address:

                                      Amgen Inc.
                                      One Amgen Center Drive
                                      Thousand Oaks, California  91320-1789

                                      Attn: Treasurer
                                      cc:   Secretary

                                      Telecopier:  (805) 499-8011
                                      Telephone:   (805) 447-1000

                                      S-1
<PAGE>
 
                                      BORROWING SUBSIDIARIES:                
                                                                             
                                      AMGEN PUERTO RICO, INC.                
 
                                      By:  /s/ Kathryn E. Falberg
                                         -----------------------------
                                               Kathryn E. Falberg

                                      Title: Chief Financial Officer and
                                             Treasurer

                                      Address:                               

                                      Amgen Inc.                             
                                      One Amgen Center Drive                 
                                      Thousand Oaks, California  91320-1789  

                                      Attn: Treasurer                        
                                      cc:   Secretary                         

                                      Telecopier:  (805) 499-8011            
                                      Telephone:   (805) 447-1000             

                                      S-2
<PAGE>
 
                                      THE ADMINISTRATIVE AGENT:         
                                      CITICORP USA, INC.
                
                                      By: /s/ Deborah Ironson
                                         ---------------------------
                                      Title:  Attorney-In-Fact
                                            ------------------------
                                      By:  
                                         ---------------------------
                                      Title: 
                                            ------------------------
                                                                        
                                     S-3  
                                                                        
<PAGE>
 
                                      THE ISSUING BANK:                 

                                      CITIBANK, N.A.                    

                                      By: /s/ Marjorie Futornick
                                         ---------------------------
                                              Marjorie Futornick

                                      Title:  Vice President
                                            ------------------------
                                      By:
                                         ---------------------------
                                      Title:
                                            ------------------------

                                      S-4
<PAGE>
 
                                      THE BANKS:

                                      CITICORP USA, INC.

                                      By: /s/ Deborah Ironson
                                         ---------------------------
                                      Title:  Attorney-In-Fact
                                            ------------------------

                                      Address:

                                      787 West Fifth Street
                                      29th Floor
                                      Los Angeles, California  90071

                                      Attn:  Deborah Ironson/Banker

                                      Telecopier:  (213) 623-3592
                                      Telephone:   (213) 239-1424

                                      S-5
<PAGE>
 
                                      BANCA COMMERCIALE
                                      ITALIANA, LOS ANGELES
                                      FOREIGN BRANCH

                                      By: /s/ E. Bombieri   /s/ J. Wityak
                                         ---------------------------------------
                                              E. Bombieri       J. Wityak
                                      Title: V.P. & MANAGER        V.P.
                                            ------------------------------------

                                      Address: 

                                      555 South Flower
                                      43rd Floor
                                      Los Angeles, California 90071

                                      Attn:  Jack Wityak

                                      S-6
<PAGE>
 
                                      ABN AMRO BANK N.V.

                                      By: /s/ Heather F. Brandt
                                         ---------------------------------
                                      Title: Heather F. Brandt
                                             -----------------------------
                                              Vice President
                                             -----------------------------

                                      By: /s/ Ellen M. Coleman
                                         ---------------------------------
                                      Title:  Ellen M. Coleman
                                             -----------------------------
                                             Vice President/Director
                                             -----------------------------

                                      Address: 
                                        
                                      300 South Grand Avenue
                                      Suite 2650
                                      Los Angeles, California 90071

                                      Attn:  Ellen Coleman

                                      S-7
<PAGE>
 
                                      SANWA BANK, LIMITED
                                      LOS ANGELES BRANCH

                                      By: /s/ Toshiko Boyd
                                         -----------------------------
                                      Title: Vice President
                                            --------------------------  

                                      Address:
  
                                      601 South Figueroa Street
                                      W5-4
                                      Los Angeles, California 90017

                                      Attn:  Toshiko Boyd

                                      S-8
<PAGE>
 
                                      BANK OF AMERICA NT & SA

                                      By: /s/ Therese A. Fontaine
                                         --------------------------------  
                                      Title:  Vice President
                                            ----------------------------- 

                                      Address:
    
                                      555 South Flower
                                      11th Floor-5413
                                      Los Angeles, California 90071

                                      Attn:  Gigi Johnson

                                      S-9
<PAGE>
 
                                   EXHIBIT A
<PAGE>
 
                                   EXHIBIT A

                       [FORM OF AGREEMENT TO PARTICIPATE]

                            AGREEMENT TO PARTICIPATE
                            ------------------------
                                                            ______________, ____

CITICORP USA, INC.


 as Administrative Agent (the  "Administrative Agent") for
 the Banks  referred to in the Credit Agreement  dated as of
 May __, 1998, among Amgen Inc., the Borrowing Subsidiaries
 therein named, the Banks therein named, Citibank, N.A. as
 Issuing Bank, and Citicorp USA, Inc., as Administrative
 Agent (the "Credit Agreement")

Ladies and Gentlemen:

          The terms not defined herein which are defined in the Credit Agreement
shall have for the purposes hereof the meaning provided therein.

          1.  [name of Eligible Subsidiary], a [jurisdiction of incorporation]
corporation ("Participant"), hereby elects to become a Borrower for all purposes
of the Credit Agreement, effective on the date hereof.

          2.  Participant hereby agrees to perform all obligations of a Borrower
under, and to be bound in all respects by the terms of, the Credit Agreement and
agrees that the Banks and the Administrative Agent shall be entitled to the
benefits of, and shall have all of the rights and remedies against Participant
described in, the Credit Agreement, as if Participant were named as a Borrower
therein and were a signatory party thereto.

          3.  Participant represents and warrants that:

          a.  Participant is a corporation duly formed, validly existing and in
       good standing under the laws of its jurisdiction of incorporation, is an
       Eligible Subsidiary and has all requisite corporate power and authority
       to enter into and perform its obligations hereunder and under the Loan
       Documents.

                                      A-1
<PAGE>
 
          b.  The execution and delivery by Participant of this Agreement to
       Participate and the Notes, and the performance by it of this Agreement to
       Participate and the Loan Documents, have been duly authorized by all
       necessary corporate action, and do not (i) require any consent or
       approval not heretofore obtained of any partner, director, stockholder,
       security holder or creditor of Participant; (ii) result in or require the
       creation or imposition of any Lien upon or with respect to any Property
       now owned or leased or hereafter acquired by Participant; (iii) violate,
       to the best knowledge of Participant, any Requirement of Law applicable
       to Participant; or (iv) result (or, with the giving of notice or passage
       of time or both, would result) in a breach of or default under, or cause
       or permit the acceleration of any obligation owed under any Contractual
       Obligation to which Participant is a party or by which Participant or any
       of its Property is bound or affected; except, in each case, where
       violation of, or default under, any such Requirement of Law or
       Contractual Obligation would not constitute a Material Adverse Effect.

          c.  Subject to the representations of the Banks contained in Section
                                                                       -------
       13.9 of the Credit Agreement, no authorization, consent, approval,
       ----                                                              
       order, license or permit from, or filing, registration or qualification
       with, any Governmental Agency is required to authorize or permit under
       applicable Laws the execution, delivery and performance by Participant
       of this Agreement to Participate or for the performance by Participant
       of the Loan Documents.

          4.  This Agreement to Participate shall be governed by and construed
in accordance with the Laws of the state of California applicable to contracts
made and performed in such state.   Participant agrees that each of the
provisions of the Credit Agreement shall apply to it and to this Agreement to
Participate as if it were an original Borrowing Subsidiary signatory thereto and
the Agreement to Participate were referenced therein.

          5.  This Agreement to Participate may be signed in any number of
counterparts, each of which shall constitute an 


                                      A-2
<PAGE>
 
original, with the same effect as if the signatures hereto and thereto were upon
the same instrument.

                                     [NAME OF ELIGIBLE SUBSIDIARY]

                                     By:________________________
                                     Title:_____________________

                                     CITICORP USA, INC.,
                                     as Administrative Agent

                                     By:________________________
                                     Title:_____________________



     This Agreement is hereby acknowledged and consented to on and as of the
date set forth above.



                                      AMGEN INC.

                                      By:________________________
                                      Title:_____________________


                                      A-3
<PAGE>
 
                                   EXHIBIT B

                        [FORM OF COMMITTED ADVANCE NOTE]

                             COMMITTED ADVANCE NOTE
                             ----------------------

$_____________                                               May__, 1998
                                               Thousand Oaks, California



          FOR VALUE RECEIVED, the undersigned promises to pay to the order of
_____________________________________ (the "Bank"), the principal amount of
______________ Dollars ($_________), or such lesser aggregate amount of
Committed Advances as may be made pursuant to the Bank's Pro Rata Share of the
Commitment under the Credit Agreement hereinafter described, payable as
hereinafter set forth.  The undersigned promises to pay interest on the
principal amount of each Committed Advance made hereunder and remaining unpaid
from time to time from the date of each such Committed Advance until the date of
payment in full, payable as hereinafter set forth.

          Reference is made to the Credit Agreement dated as of May __, 1998 (as
amended from time to time, the "Credit Agreement"), among Amgen Inc., the
Borrowing Subsidiaries therein named, the Banks therein named, Citibank, N.A.,
as Issuing Bank, and Citicorp USA, Inc., as Administrative Agent.  Terms defined
in the Credit Agreement and not otherwise defined herein are used herein with
the meanings defined for those terms in the Credit Agreement.  This is one of
the Committed Advance Notes ("Note") referred to in the Credit Agreement, and
any holder hereof is entitled to all of the rights, remedies, benefits and
privileges provided for in the Credit Agreement as originally executed or as it
may from time to time be supplemented, modified, amended, renewed, extended or
supplanted.  The Credit Agreement, among other things, contains provisions for
acceleration of the maturity hereof upon the happening of certain stated events
upon the terms and conditions therein specified.

          The principal indebtedness evidenced by this Note shall be payable as
provided in the Credit Agreement and in any event on the Maturity Date.

          Interest shall be payable on the outstanding daily unpaid principal
amount of each Committed Advance hereunder from the date thereof until payment
in full and shall accrue and be payable at the rates and on the dates set forth
in the Credit Agreement both before and after default, before and after maturity
and judgment, and before and after the commencement of any proceeding under any
Debtor Relief Law with interest on overdue interest to bear interest at the rate
set forth in 
                                      B-1
<PAGE>
 
Section 3.9 of the Credit Agreement, to the extent permitted by applicable Laws.

          The undersigned shall have the right to prepay any amounts outstanding
under this Note in accordance with Section 3.1(f) of the Credit Agreement.

          The amount of each payment hereunder shall be made to the
Administrative Agent at the Administrative Agent's Office, for the account of
the Bank, in lawful money of the United States of America and in immediately
available funds not later than 2:00 p.m., New York City time, on the day of
payment (which must be a Banking Day).  All payments received after 2:00 p.m.,
New York City time, on any particular Banking Day shall be deemed received on
the next succeeding Banking Day.

          The Bank shall use its best efforts to keep a record of Committed
Advances made by it and payments received by it with respect to this Note and,
subject to Section 10.6(g) of the Credit Agreement, such record shall be
presumptive evidence of the principal amount owing under this Note.

          As set forth in Section 13.3 of the Credit Agreement, the undersigned
hereby promises to pay the reasonable out-of-pocket costs and expenses of any
holder hereof incurred in collecting the undersigned's obligations hereunder or
in enforcing any holder's rights hereunder, including attorneys' fees and
disbursements.

          The undersigned hereby waives presentation, demand for payment,
dishonor, notice of dishonor, protest, notice of protest and any other notice of
formality, to the fullest extent permitted by applicable Laws.

          THIS NOTE SHALL BE DEEMED DELIVERED TO AND ACCEPTED BY THE
ADMINISTRATIVE AGENT ON BEHALF OF THE BANK IN THE STATE OF CALIFORNIA, AND SHALL
BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE
STATE OF CALIFORNIA APPLICABLE TO CONTRACTS MADE AND PERFORMED IN SUCH STATE.

                                        [BORROWER]



                                        By_____________________________

                                             Its_______________________

                                      B-2
<PAGE>
 
                  COMMITTED ADVANCES AND PAYMENTS OF PRINCIPAL
                                UNDER COMMITMENT

<TABLE>
<CAPTION>
                     Amount      Amount
           Type        of          of        Unpaid
            of      Committed   Principal   Principal   Notation
Date      Advance    Advance      Paid       Balance    Made By
<S>       <C>        <C>        <C>         <C>        <C>   
</TABLE>

                                      B-3
<PAGE>
 
                                   EXHIBIT C

                       [FORM OF COMPETITIVE ADVANCE NOTE]

                            COMPETITIVE ADVANCE NOTE
                            ------------------------

$150,000,000                                                     May __, 1998
                                                    Thousand Oaks, California


          FOR VALUE RECEIVED, the undersigned promises to pay to the order of
____________________________________ (the "Bank"), the principal amount of One
Hundred and Fifty Million Dollars ($150,000,000), or such lesser aggregate
amount of Competitive Advances as may be made pursuant to Section 2.4 of the
Credit Agreement hereinafter described, payable as hereinafter set forth.  The
undersigned promises to pay interest on the principal amount of each Competitive
Advance made hereunder and remaining unpaid from time to time from the date of
each such Competitive Advance until the date of payment in full, payable as
hereinafter set forth.

          Reference is made to the Credit Agreement dated as of May __, 1998 (as
amended from time to time, the "Credit Agreement"), among Amgen Inc., the
Borrowing Subsidiaries therein named, the Banks therein named, Citibank, N.A.,
as Issuing Bank, and Citicorp USA, Inc. as Administrative Agent. Terms defined
in the Credit Agreement and not otherwise defined herein are used herein with
the meanings defined for those terms in the Credit Agreement. This is one of the
Competitive Advance Notes ("Note") referred to in the Credit Agreement, and any
holder hereof is entitled to all of the rights, remedies, benefits and
privileges provided for in the Credit Agreement as originally executed or as it
may from time to time be supplemented, modified, amended, renewed, extended or
supplanted. The Credit Agreement, among other things, contains provisions for
acceleration of the maturity hereof upon the happening of certain stated events
upon the terms and conditions therein specified.

          The principal indebtedness evidenced by this Note shall be payable in
accordance with each Competitive Bid of the Bank as provided in the Credit
Agreement and in any event on the Maturity Date.

          Interest shall be payable on the outstanding daily unpaid principal
amount of each Competitive Advance hereunder from the date thereof until payment
in full and shall accrue and be payable in accordance with each Competitive Bid
of the Bank as provided in the Credit Agreement both before and after default,
before and after maturity and judgment, and before and after the commencement of
any proceeding under any Debtor Relief Law with interest on overdue interest to
bear interest at the rate set 

                                      C-1
<PAGE>
 
forth in Section 3.9 of the Credit Agreement, to the extent permitted by
applicable Laws.

          The undersigned may not prepay the amounts outstanding under this Note
without the consent of the holder hereof, in accordance with Section 3.1(g) of
the Credit Agreement.

          The amount of each payment hereunder shall be made to the
Administrative Agent at the Administrative Agent's Office, for the account of
the Bank, in lawful money of the United States of America and in immediately
available funds not later than 2:00 p.m., New York City time, on the day of
payment (which must be a Banking Day).  All payments received after 2:00 p.m.,
New York City time, on any particular Banking Day shall be deemed received on
the next succeeding Banking Day.

          The Bank shall use its best efforts to keep a record of Competitive
Advances made by it and payments of principal with respect to this Note and,
subject to Section 10.6(g) of the Credit Agreement, such record shall be
presumptive evidence of the principal amount owing under this Note.

          As set forth in Section 13.3 of the Credit Agreement, the undersigned
hereby promises to pay the reasonable out-of-pocket costs and expenses of any
holder hereof incurred in collecting the undersigned's obligations hereunder or
in enforcing any holder's rights hereunder, including reasonable attorneys' fees
and disbursements.

          The undersigned hereby waives presentment, demand for payment,
dishonor, notice of dishonor, protest, notice of protest and any other notice or
formality, to the fullest extent permitted by applicable Laws.

          THIS NOTE SHALL BE DEEMED DELIVERED TO AND ACCEPTED BY THE
ADMINISTRATIVE AGENT ON BEHALF OF THE BANK IN THE STATE OF CALIFORNIA, AND SHALL
BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE
STATE OF CALIFORNIA APPLICABLE TO CONTRACTS MADE AND PERFORMED IN SUCH STATE.

                         [Borrower]
 
                         By_____________________________

                              Its_______________________

                                      C-2
<PAGE>
 
                COMPETITIVE ADVANCES AND PAYMENTS OF PRINCIPAL

<TABLE> 
<CAPTION> 

      Stated                Amount      Amount
      Fixed                   of          of       Unpaid
     Interest   Maturity  Competitive  Principal  Principal Principal Notation
Date   Rate       Date      Advance      Paid      Balance   Balance   Made By
<S>  <C>        <C>       <C>          <C>        <C>       <C>       <C> 
</TABLE> 
                                      C-3
<PAGE>
 
                                   EXHIBIT D

                           [FORM OF COMPETITIVE BID]

                                COMPETITIVE BID
                                ---------------

                                                   (Date)

[BORROWER]
___________________________
___________________________
___________________________
Attention: ___________________

Ladies and Gentlemen:

          The undersigned _________________________________ ("Bank"), refers to
the Credit Agreement dated as of May __, 1998 (the "Agreement"), among Amgen
Inc., the Borrowing Subsidiaries therein named, the Banks therein named,
Citibank, N.A., as Issuing Bank, and Citicorp USA, Inc., as Administrative
Agent.  Capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in the Agreement.  The undersigned
hereby makes a Competitive Bid pursuant to Section 2.4(f) of the Agreement, in
response to the Competitive Bid Request made by ____________________ (the
"Borrower") on ____________________, 19__, for a Competitive Advance in the
amount of______________ to bear interest at a fixed interest rate of _____% per
annum to be made on 19__, with a maturity date of ______________, 19__.

          The undersigned hereby confirms that it is prepared to extend credit
to the Borrower in accordance with Section 2.4(i) of the Agreement upon
acceptance by the Borrower of this bid in accordance with Section 2.4(h) of the
Agreement.

                               Very truly yours,

                               [NAME OF BANK]

                               By_________________________________

                                    Its___________________________

                               By_________________________________
  
                                    Its___________________________
             

                                      D-1
<PAGE>
 
                                   EXHIBIT E

                       [FORM OF COMPETITIVE BID REQUEST]

                            COMPETITIVE BID REQUEST
                            -----------------------



To:  Each of the Banks party to the Credit Agreement referenced
     below

     Citicorp USA, Inc.
     Penns Way, Suite 200
     New Castle, DE  19720
     Attn:  John Williams
     Phone:  (302) 894-6013
     Fax:  (302) 894-6120

Ladies and Gentlemen:

          The undersigned, _________________________ (the "Borrower"), refers to
the Credit Agreement dated as of May __, 1998 (the "Credit Agreement"), among
Amgen Inc., the Borrowing Subsidiaries therein named, the Banks therein named,
Citibank N.A., as Issuing Bank, and Citicorp USA, Inc., as Administrative Agent.
The Borrower hereby requests pursuant to Section 2.4(b) of the Credit Agreement
that the Banks submit Competitive Bids for a Competitive Advance on the
following terms:

          (a) Date of Competitive Advance: ______________, 19__

          (b) Amount of Competitive Advance: $___________________

          (c) Maturity Date: ____________________

          In connection with the Competitive Advance requested herein, upon
acceptance of any Competitive Bid offered by the Bank in response to this
Competitive Bid Request pursuant to Section 2.4(b) of the Credit Agreement, the
Borrower shall be deemed to have represented and warranted that the conditions
to lending in Section 8.2 of the Credit Agreement have been satisfied.

                                Very truly yours,

                                [BORROWER]

                                By_______________________________

                                     Its_________________________


                                      E-1
<PAGE>
 
                                   EXHIBIT F

                        [FORM OF COMPLIANCE CERTIFICATE]

                             COMPLIANCE CERTIFICATE
                             ----------------------


          1. This Compliance Certificate ("Compliance Certificate") is executed
and delivered by AMGEN INC., a Delaware corporation (the "Company"), to CITICORP
USA, INC. (the "Administrative Agent") pursuant to Section 7.2 of the Credit
                                                   -----------
Agreement (the "Credit Agreement") dated as of May __, 1998 among Amgen Inc.,
the Borrowing Subsidiaries therein named, the Banks therein named, Citibank,
N.A., as Issuing Bank, and Citicorp USA, Inc., as Administrative Agent. Any
terms used herein and not defined herein shall have the meanings defined in the
Credit Agreement. This Compliance Certificate covers the Company's:


                                Fiscal Quarter ended ________________, ____

                                Fiscal Year ended December 31, _____

          2. The following paragraphs set forth calculations showing whether
the Company is in compliance with its obligations pursuant to Sections 6.5, 6.7
                                                              -----------------
and 6.8 of the Credit Agreement, as of the end of the fiscal period set forth in
    ---                                                                         
paragraph 1 hereof.  The calculations also determine the Cross-Default Amount
referred to in Section 9.1(f) of the Credit Agreement.  Each calculation set
               --------------                                               
forth below identified as "Actual" is derived from the books and records of the
Company in accordance with the relevant definitions of financial terms set forth
in Section 1.1 of the Credit Agreement, and correctly reflects whether the
   -----------                                                            
Company is in compliance with the obligations contained in the applicable
Sections of the Credit Agreement parenthetically noted, which obligations are
set forth below identified under the column marked "Required/Permitted".


                                      F-1
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                            Actual             Required/Permitted
                                                                            ------             ------------------
<S>                                                                        <C>                 <C> 
I.     Liens (Section 6.5(e)):
       ---------------------- 

  (a)  Indebtedness of the Company and its Subsidiaries
       incurred after the date of the Credit Agreement secured by
       Liens                                                                 $___________
 
 
  (b)  Total assets of the Company                                           $___________

       (a)                                                          =        $___________      Not greater than 35%
       ---                                                                                     In compliance ___ (Y or N)
       (b)

II.     Interest Charge Coverage Ratio
        ------------------------------
        (Section 6.7):
       -----------------

  (a)   Adjusted Net Income for the four immediately preceding
        Fiscal Quarters
 
        (i)  Net Income                                                      $___________

       (ii)  Extraordinary Losses                                            $___________

      (iii)  Extraordinary Gains                                             $___________

       (i) + (ii) - (iii)  =                                                 $___________

  (b)   Interest Charges during the four immediately
        preceding Fiscal Quarters
 
        (i)  Interest, fees, charges and related expenses
             paid or payable (without duplication) to lenders in
             connection with money borrowed or the deferred
             purchase price of assets that is treated as interest
             in accordance with Generally  Accepted Accounting
             Principles excluding interest paid or payable
             (without duplication) for that fiscal period on any
             intercompany loans                                              $___________
 
 
 
        (ii) Portion of rent paid or payable (without
             duplication) under Capital Leases that should be
             treated as interest in accordance with Generally
             Accepted Accounting Principles                                  $___________
 

        (i) + (ii)                                                   =       $___________

   (c)  Depreciation expense during the four immediately preceding
        Fiscal Quarters                                                      $___________
 

   (d)  Amortization expense during the four immediately preceding
        Fiscal Quarters                                                      $___________
 
</TABLE> 
                                      F-2
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                               Actual          Required/Permitted
                                                                               ------          ------------------
<S>                                                                          <C>               <C> 
(e)  Provisions for taxes based on income during the four
     immediately preceding Fiscal Quarters                                     $___________

 
     (a) + (b) + (c) + (d) + (e)                                         =     ____:1.00       Not less than 3.00:1.00
     ---------------------------                                                               In compliance ___ (Y or N)
                 (b)


III. Tangible Net Worth (Section 6.8):
     -------------------------------- 

     Items (a), (b) and (c) are to be aggregated for all Fiscal
     Quarters in the Calculation Period, which commences
     January 1, 1998 and ends on the last day of the Fiscal
     Quarter for which the calculation is being made.
 
(a)  25% of net proceeds of issuance of equity securities
     during all Fiscal Quarters in the Calculation Period                      $___________

(b)  25% of Net Income for all Fiscal Quarters in the
     Calculation Period                                                        $___________
 
(c)  25% of funds used by the Company to repurchase the
     Company's equity securities during all Fiscal Quarters in the
     Calculation Period                                                        $___________

(d)  Tangible Net Worth:
 
     (i)  Shareholders' Equity of the 
          Company and its Consolidated
          Subsidiaries                                                         $___________
 

     (ii)  Book value of Intangible 
           Assets of the Company and its
           Consolidated Subsidiaries                                           $___________
 

     (i) - (ii)                                                          =     $___________    Not less than $1,500,000,000 + 
                                                                                               (a) + (b) - (c) = 
                                                                                               $____________.
                                                                                               In compliance ___ (Y or N)

IV.  Cross-Default Amount (Section 9.1(f)):
     ------------------------------------- 

(a)  Tangible Net Worth (from Paragraph III(d)) x 5%                     =     $___________
                                                                         
(b)  $50,000,000                                                         
                                                                         
     Cross-Default Amount =                                              
     the lesser of (a) or (b)                                            =     $___________
</TABLE> 

                                      F-3
<PAGE>
 
          3.   To the best knowledge of the undersigned, during the fiscal
period covered by this Compliance Certificate, no Default or Event of Default
has occurred and is continuing, with the exceptions set forth below in response
to which the Company has taken or proposes to take the following actions (if
none, so state):

- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
          4.   This Compliance Certificate is executed on ______________, ____, 
by a Senior Officer of the Company. The undersigned hereby certifies that each
and every matter contained herein is derived from the Company's books and
records and is, to the best knowledge of the undersigned, true and correct.

                                AMGEN INC.

                                By______________________________

                                    Its______________________


                                      F-4
<PAGE>
 
                                  EXHIBIT G-1



                                 [see attached]



                                     G-1-1
<PAGE>
 
                                  May 28, 1998



(213) 669-6000                                                   155,076-025

Citicorp USA, Inc.
 as Administrative Agent
725 Figueroa Street
Los Angeles, California  90017

 and

The Banks and Issuing Bank Named On the List
 Attached Hereto as Exhibit A

          Re:  Credit Agreement, dated as of May 28, 1998, among Amgen Inc., the
               Borrowing Subsidiaries therein named, the Banks therein named,
               Citibank N.A., as Issuing Bank, and Citicorp USA, Inc., as
               Administrative Agent
               -----------------------------------------------------------------

Ladies and Gentlemen:

          We have acted as counsel to Citicorp USA, Inc., as Administrative
Agent (in such capacity, the "Administrative Agent"), in connection with the
preparation and delivery of a Credit Agreement dated as of May 28, 1998 (the
"Credit Agreement") among Amgen Inc., a Delaware corporation (the "Company"),
the Borrowing Subsidiaries therein named, the Banks named therein, Citibank,
N.A., as Issuing Bank and the Administrative Agent and in connection with the
preparation and delivery of certain related documents.  Unless otherwise
indicated, capitalized terms used herein but not otherwise defined herein have
the respective meanings set forth in the Credit Agreement.
<PAGE>
 
          We have participated in various conferences with representatives of
the Company and the Administrative Agent during which the Credit Agreement and
related matters have been discussed.  We have reviewed the forms of the Credit
Agreement and the exhibits thereto, including the form of the promissory notes
annexed thereto (the "Notes") and the opinion of Thomas E. Workman, Jr.
("Opinion") and the officers' certificates and other documents delivered on the
date hereof.  We have assumed the genuineness of all signatures, the
authenticity of all documents submitted to us as originals or copies and the due
authority of all persons executing the same, and we have relied as to factual
matters on the documents that we have reviewed.

          On the basis of the foregoing, we are of the opinion that the Credit
Agreement constitutes the legally valid and binding obligation of the Borrowers,
and each Note constitutes the legally valid and binding obligation of the
Borrower that has executed such Note, enforceable against the applicable
Borrower in accordance with their respective terms, except as may be limited by
bankruptcy, insolvency, reorganization, moratorium or similar laws relating to
or affecting creditors' rights generally (including, without limitation,
fraudulent conveyance laws) and by general principles of equity, including,
without limitation, concepts of materiality, reasonableness, good faith and fair
dealing and the possible unavailability of specific performance or injunctive
relief, regardless of whether considered in a proceeding in equity or at law.

          In giving the foregoing opinion, we have assumed, without independent
investigation, that the Credit Agreement and the Notes have been duly authorized
by all necessary corporate action on the part of each of the Borrowers and have
been duly executed and delivered by each of the Borrowers party thereto and that
each of the Borrowers is a corporation duly organized, validly existing and in
good standing under the jurisdiction of its incorporation.  We understand that
you are relying on the opinion of Thomas E. Workman, Jr., general counsel of the
Company, with respect to such matters.

          Our opinion as to the enforceability of the Agreement is subject to:

          (i) public policy considerations, statutes or court decisions that may
limit the rights of a party to obtain indemnification against its own negligence
of willful misconduct; and

          (ii) the unenforceability under certain circumstances of broadly or
vaguely stated waivers or waivers of rights granted by law where the waivers are
against public policy or prohibited by law.
<PAGE>
 
          In addition, we

          (i) express no opinion as to the effect of non-compliance by you with
any state or federal laws or regulations applicable to the transactions
contemplated by the Credit Agreement because of the nature of your business;

          (ii) advise you that Section 13.24 of the Credit Agreement which
provides for non-exclusive jurisdiction of the courts of the State of California
and federal courts sitting in that State, may not be binding on the federal
courts sitting in California;

          (iii) express no opinion with respect to your ability to collect
attorneys' fees and costs in an action involving the Credit Agreement if you are
not the prevailing party in that action (we call your attention to the effect of
Section 1717 of the California Civil Code, which provides that where a contract
permits one party thereto to recover attorneys' fees, the prevailing party in
any action to enforce any provision of the contract shall be entitled to recover
its reasonable attorneys' fees).

          (iv) express no opinion as to any provision of the Credit Agreement
requiring written amendments or waivers of the Credit Agreement insofar as it
suggests that oral or other modifications, amendments or waivers could not be
effectively agreed upon by the parties or that the doctrine of promissory
estoppel might not apply; and

          (v) advise you of California statutory provisions and case law to the
effect that, in certain circumstances, a guarantor may be exonerated if the
creditor, without the consent of the guarantor, materially alters the original
obligation of the principal, elects remedies for default that impair the
subrogation or reimbursement rights of the guarantor against the principal, or
otherwise takes action that materially prejudices the guarantor.  There is also
authority (including California Civil Code Section 2856, which has not yet been
the subject to judicial interpretation) to the effect that a guarantor may
effectively waive statutory suretyship defenses if express waivers of such
defenses are set forth in the guaranty.  We express no opinion as to the
effectiveness, under California law, of the waivers set forth in Article 11 of
the Credit Agreement, although we believe that a California court should hold
that the explicit language contained in Article 11 of the Credit Agreement
waiving such defenses is enforceable.  We express no opinion as to the effect on
Article 11 of the Credit Agreement of:  (i) any modification to or amendment of
a Borrower's obligations that materially increases those obligations, or (ii)
any other action by the Administrative Agent or any Bank that materially
<PAGE>
 
prejudices the Company acting in its capacity as guarantor, if in any such
instance, such modification, amendment or action occurs without notice to and
the consent of the Company acting in its capacity as guarantor.

          The law covered by this opinion is limited to present federal law and
the present law of the State of California.  We express no opinion as to the
laws of the any other jurisdiction and no opinion regarding the statutes,
administrative decisions, rules, regulation or requirements or any country,
municipality, subdivision or local authority or any jurisdiction.

          This opinion is furnished by us as special counsel for the
Administrative Agent and may be relied upon by you only in connection with the
Credit Agreement.  It may not be used or relied upon by you for any other
purpose or by any other person, nor may copies be delivered to any other person,
without in each instance our prior written consent other than to attorneys for
and auditors of the Banks, the Issuing Bank and the Administrative Agent, to
governmental officials with regulatory authority with respect to the business of
the Banks, the Issuing Bank and the Administrative Agent and to bona fide
prospective purchasers of assignments of or participations in the debt arising
under the Loan Documents.

                                                     Respectfully submitted,
<PAGE>
 
                                   EXHIBIT H

                         [REQUEST FOR LETTER OF CREDIT]

                          REQUEST FOR LETTER OF CREDIT
                          ----------------------------

          1.  This Request for Letter of Credit is executed and delivered by
___________________ (the "Borrower") to Citibank, N.A. (the "Issuing Bank")
pursuant to that certain Credit Agreement (the "Credit Agreement") dated as of
May __, 1998, entered into among Amgen Inc., the Borrowing Subsidiaries therein
named, the Banks therein named, Citibank, N.A., as Issuing Bank and Citicorp
USA, Inc., as Administrative Agent.  Terms defined in the Credit Agreement and
not otherwise defined herein are used herein as defined in the Credit Agreement.

          2.  Borrower hereby requests that the Issuing Bank issue a Letter of
Credit as follows:

              (a) Amount of Letter of Credit: $_______________.

              (b) Date of Issuance:  _________________, ____.

              (c) Beneficiary under Letter of Credit:

                  Name:
                       _________________________________
                  Address: _____________________________
                      _____________________________
                      _____________________________

              (d) Expiry Date:  ______________________, _____

              (e) Purpose of Letter of Credit:

                  ____________________________
                  ____________________________   
                  ____________________________
   
              (f) Additional Information/Terms:

                  ____________________________
                  ____________________________
                  ____________________________

          3.  The requested Letter of Credit is (check one box only):

               [ ]  a new Letter of Credit in addition to Letters of Credit
                    already outstanding.


                                      H-1
<PAGE>
 
               [ ]  a supplement, modification, amendment, renewal, or extension
                    to or of the following outstanding Letter(s) of Credit:
                   (Identify)
                    ----------

          4.  In connection with the issuance of the Letter of
Credit requested herein, Borrower hereby represents, warrants, and certifies to
the Banks that:

               (a)  As of the date of issuance of the Letter of Credit requested
          herein, each of the representations and warranties made by Borrower in
          Article 4 of the Credit Agreement, other than Sections 4.4 and 4.8 and
                                                        --------------------    
          the first sentence of Section 4.6, is true and correct in all material
                                -----------                                     
          respects as though such representations and warranties were made on
          and as of the date of the issuance of the requested Letter of Credit
          (except to the extent such representations and warranties specifically
          relate to an earlier date in which case they are true and correct in
          all material respects as of such earlier date);

               (b) Except for (a) any matter fully covered (subject to
          applicable deductibles and retentions) by insurance for which the
          insurance carrier has assumed full responsibility and (b) matters
          described in clauses (b) or (c) of Section 4.8 of the Credit Agreement
                                             ----------- 
          on the Closing Date, there is no action, suit, proceeding or
          investigation pending as to which the Company or any of its
          Subsidiaries have been served or have received notice or, to the best
          knowledge of the Company, threatened against or affecting the Company
          or its Subsidiaries or any Property of any of them before any
          Governmental Agency that constitutes a Material Adverse Effect; and

                (c) Following the issuance of the Letter of Credit requested
          herein (i) the aggregate face amount of all outstanding Letters of
          Credit will not exceed $25,000,000 (ii) the sum of all Committed
          Advances then outstanding plus the sum of all Competitive Advances
                                    ---- 
          then outstanding plus the face amount of all Letters of Credit then
                           ---- 
          outstanding plus the sum of all unreimbursed drawings under Letters of
                      ----
          Credit shall not exceed the Commitment, and (iii) the Total
          Outstandings will not exceed the Commitment.

          5.  Attached hereto is an Application for the Letter
of Credit on the form provided to Borrower by the Issuing Bank.

                                      H-2
<PAGE>
 
          6.  This Request for Letter of Credit is executed on ____________,
____, by a Responsible Official of Borrower, on behalf of Borrower. The
undersigned, in such capacity, hereby certifies each and every matter contained
herein to be true and correct.

                         [BORROWER]
 
                         By___________________________

                              Its_____________________

                                      H-3
<PAGE>
 
                                   EXHIBIT I

                               [REQUEST FOR LOAN]

                                REQUEST FOR LOAN
                                ----------------

          1.  This Request for Loan is by __________________ (the "Borrower") to
Citicorp USA, Inc. (the "Administrative Agent") pursuant to that certain Credit
Agreement (the "Credit Agreement) dated as of May __, 1998 between Amgen Inc.,
the Borrowing Subsidiaries therein named, the Banks therein named, Citibank,
N.A., as Issuing Bank, and Citicorp USA, Inc., as Administrative Agent.
Capitalized terms used herein and not defined herein shall have the meanings
defined in the Credit Agreement.

          2.  Borrower hereby requests that Bank make a Loan for the account of
Borrower pursuant to the Credit Agreement as follows:

              (a)  DATE OF LOAN:                         _______

              (b)  TYPE OF LOAN (Check one box only):

                   [ ] BASE RATE LOAN
 
                   [ ] EURODOLLAR LOAN WITH A
                        ___ --MONTH EURODOLLAR PERIOD

               (c) AMOUNT OF REQUESTED LOAN:            $_______

               (d) INTEREST PERIOD OF LOAN ENDS:        ________

          3.  In connection with each request pursuant to Section 2 above,
Borrower certifies that:

               (a)  The aggregate outstanding balance of Competitive Advances is
                    $___________________.

               (b)  As of the date of the requested Loan, (i) each 
          representation and warranty made by Borrower in Article 4 of the
          Credit Agreement, other than Sections 4.4 and 4.8 and the first
                                       --------------------   
          sentence of Section 4.6, will be true and correct, both immediately
                      -----------     
          before and after giving effect to such Loan, as though such
          representations and warranties were made on and as of that date
          (except to the extent such representations

                                      I-1
<PAGE>
 
          and warranties specifically relate to an earlier date in which case
          they shall be true and correct in all material respects as of such
          earlier date), (ii) except for (a) any matter fully covered (subject
          to applicable deductibles and retentions) by insurance for which the
          insurance carrier has assumed full responsibility and (b) matters
          described in clauses (b) or (c) of Section 4.8 of the Credit Agreement
                                             -----------
          on the Closing Date, there is no action, suit, proceeding or
          investigation pending as to which the Company or any of its
          Subsidiaries have been served or have received notice or, to the best
          knowledge of the Company, threatened against or affecting Company or
          any of its Subsidiaries or any Property of any of them before any
          Governmental Agency that constitutes a Material Adverse Effect, and
          (iii) after giving effect to the requested Loan, the Total
          Outstandings will not exceed the Commitment.

          4.  This Request for Loan is executed on _________________, ____ by a
Responsible Official of Borrower on behalf of Borrower.  The undersigned, in
such capacity, hereby certifies each and every matter contained herein to be
true and correct except as previously disclosed by Borrower in writing to the
                 ------                                                      
Banks and waived by the Majority Banks or all Banks, as applicable.

                         [BORROWER]
 

                         By ____________________________

                              Its ______________________


                                      I-2
<PAGE>
 
                                   EXHIBIT J

                         [FORM OF ASSIGNMENT AGREEMENT]

                              ASSIGNMENT AGREEMENT
                              --------------------

          Reference is made to the Credit Agreement dated as of May __, 1998 (as
it may be amended, supplemented or otherwise modified from time to time, the
"Credit Agreement") among Amgen Inc. (the "Company"), the Borrowing Subsidiaries
therein named, the Banks therein named, Citibank, N.A. as Issuing Bank, and
Citicorp USA, Inc., as Administrative Agent.  Capitalized terms used herein and
not otherwise defined shall have the meanings assigned to such terms in the
Credit Agreement.

          ________________ ("Assignor") and ______________ ("Assignee") agree as
follows:

               1.  Assignor hereby sells and assigns to Assignee, and Assignee
     hereby purchases and assumes from Assignor, a __% interest in and to all
     Assignor's rights and obligations under the Credit Agreement as of the
     Effective Date (as defined in Paragraph 4 below) (including, without
     limitation, such percentage interest in the Pro Rata Share of the
     Commitment of Assignor on the Effective Date and such percentage interest
     in the Loans owing to the Assignor outstanding on the Effective Date,
     together with such percentage interest in all unpaid interest and fees
     accrued to the Effective Date).

               2.  Assignor (i) represents that as of the date hereof, its Pro
     Rata Share of the Commitment (without giving effect to assignments thereof
     which have not yet become effective) is $__________, and the outstanding
     balance of its Loans (not reduced by any assignments thereof which have not
     yet become effective) is $__________; (ii) represents that this Assignment
     Agreement is entered into in accordance with the provisions of subsection
     13.9 of the Credit Agreement; (iii) makes no representation or warranty and
     assumes no responsibility with respect to any statements, warranties or
     representations made in or in connection with the Credit Agreement or the
     execution, legality, validity, enforceability, genuineness, sufficiency or
     value of the Credit Agreement or any other instrument or document furnished
     pursuant thereto, other than that it is the legal and beneficial owner of
     the interest being assigned by it hereunder and that such interest is free
     and clear of any adverse claim; and (iv) makes no representation or
     warranty and assumes no responsibility with respect to the financial
     condition 

                                      J-1
<PAGE>
 
     of the Company or its Subsidiaries or the performance or observance by the
     Company or any of its Subsidiaries of any of its or their obligations under
     the Credit Agreement or any other instrument or document furnished pursuant
     thereto.

               3.  Assignee (i) represents and warrants that it is legally
     authorized to enter into this Assignment Agreement; (ii) confirms that it
     has received a copy of the financial statements delivered pursuant to
     subsections 4.5 and 7.1 of the Credit Agreement and such other documents
     and information as it has deemed appropriate to make its own credit
     analysis and decision to enter into this Assignment Agreement; (iii) agrees
     that it will, independently and without reliance upon the Administrative
     Agent, the Co-Arrangers, Assignor or any other Bank and based on such
     documents and information as it shall deem appropriate at the time,
     continue to make its own credit decisions in taking or not taking action
     under the Credit Agreement; (iv) appoints and authorizes the Administrative
     Agent to take such action as agent on its behalf and to exercise such
     powers under the Credit Agreement as are delegated to the Administrative
     Agent by the terms thereof, together with such powers as are reasonably
     incidental thereto; (v) agrees that it will perform in accordance with
     their terms all the obligations which by the terms of the Credit Agreement
     are required to be performed by it as a Bank; and (vi) agrees that it will
     keep confidential all information with respect to the Company furnished to
     it by the Company or Assignor (other than information generally available
     to the public or otherwise available to Assignor on a nonconfidential
     basis).

               4.  The effective date (the "Effective Date") for this Assignment
     Agreement shall be the date of execution by the Administrative Agent and
     the Company of this Assignment Agreement.

               5.  From and after the Effective Date, (i) Assignee shall be a
     party to the Credit Agreement, and to the extent provided in this
     Assignment Agreement, have the rights and obligations of a Bank, and (ii)
     Assignor shall, to the extent provided in this Assignment Agreement,
     relinquish its rights and be released from its obligations under the Credit
     Agreement.

               6.  From and after the Effective Date, the Administrative Agent
     shall make all payments in respect of any interest assigned hereby
     (including payments of principal, interest, fees and other amounts) to

                                      J-2
<PAGE>
 
     Assignee.  Assignor and Assignee shall make all appropriate adjustments for
     payments for periods prior to the Effective Date by the Administrative
     Agent and with respect to the making of this assignment directly between
     themselves.

               7.  This Assignment Agreement shall be governed by, and construed
     and enforced in accordance with, the Laws of the state of California
     applicable to contracts made and performed in such state.

                              [NAME OF ASSIGNOR]

                              By:______________________
                              Title:___________________



                              [NAME OF ASSIGNEE]

                              By:______________________
                              Title:___________________

Accepted this _____ day of
____________________, 199_

CITICORP USA, INC.
as Administrative Agent

By:__________________________
Title:_______________________

AMGEN INC.



By:__________________________
Title:_______________________

                                      J-3
<PAGE>
 
                                 SCHEDULE 1.1
                                 ------------
                                        
                             BORROWING SUBSIDIARIES

1.  AMGEN PUERTO RICO, INC., a Delaware corporation, is a wholly owned
subsidiary of Amgen Inc.; has a principal business address of State Road 31,
Kilometer 24.6, Juncos, Puerto Rico 00777-4060.
<PAGE>
 
                                 SCHEDULE 1.2
                                 ------------
                                        
                           WHOLLY OWNED SUBSIDIARIES
                                        
SUBSIDIARIES OF AMGEN INC.
- --------------------------

1.  AMGEN BOULDER DEVELOPMENT CORPORATION, a Colorado corporation having a
principal business address of 3200 Walnut Street, Boulder, Colorado  80301-2546.

2.  AMGEN BOULDER PRODUCTION CORPORATION, a Colorado corporation, having a
principal business address of 3200 Walnut Street, Boulder, Colorado  80301-2546.

3.  AMGEN CAMBRIDGE REAL ESTATE HOLDINGS INC., a Delaware corporation, is a
wholly owned subsidiary of Amgen Inc.; has a principal business address of One
Amgen Center Drive, Thousand Oaks, California, 91320-1789.

4.  AMGEN HOLDING, INC., a California corporation, is a wholly owned subsidiary
of Amgen Inc.; has a principal business address of One Amgen Center Drive,
Thousand Oaks, California, 91320-1789.

5.  AMGEN INTERNATIONAL INC., a Delaware corporation, is a wholly owned
subsidiary of Amgen Inc.; has a principal business address of One Amgen Center
Drive, Thousand Oaks, California, 91320-1789.

6.  AMGEN KABUSHIKI KAISHA, a Japanese corporation, is a wholly owned subsidiary
of Amgen Inc.; has a principal business address of Hamacho Center Building, 13F,
2-31-1 Nihonbashi Hamacho, Chuo-ku, Tokyo 103, Japan.

7.  AMGEN PUERTO RICO, INC., a Delaware corporation, is a wholly owned
subsidiary of Amgen Inc.; has a principal business address of State Road 31,
Kilometer 24.6, Juncos, Puerto Rico 00777-4060.

8.  AMGEN SALES CORPORATION, a Barbados corporation and a foreign sales
corporation, is a wholly owned subsidiary of Amgen Inc.; has a principal
business address of c/o Corporate Services Limited, Collymore Rock, St. Michael,
Barbados, West Indies.

9.  SYNERGEN EUROPE INC., a Colorado corporation, having a principal business
address of 3200 Walnut Street, Boulder, Colorado  80301-2546.

SUBSIDIARIES OF SYNERGEN EUROPE INC.
- ------------------------------------

1.  SYNERGEN B.V., a Dutch corporation, having a principal business address of
Koningennegracht 61-62, 2414 AE The Hague, The Netherlands.

2.  SYNERGEN S.P.A., an Italian corporation, having a principal business address
of Amgen Inc., One Amgen Center Drive, Thousand Oaks, California  91320-1789.

                                       1
<PAGE>
 
SUBSIDIARIES OF AMGEN INTERNATIONAL INC.
- ----------------------------------------

1.  AMGEN AB, a Swedish corporation, having a principal business address of
Ralambsvagen 17, P.O. Box 34107, 100-26 Stockholm, Sweden.

2.  AMGEN B.V., a Dutch corporation, is a wholly owned subsidiary of Amgen
International Inc.; having a principal business address of Elleboog 56, P.O. Box
3345, 4800 DH Breda, The Netherlands.

3.  AMGEN CARIBE CORPORATION, a Puerto Rican corporation, is a wholly owned
subsidiary of Amgen International Inc., having a principal business address of
State Road 31, Kilometer 24.6, Juncos, Puerto Rico 00777-4060.

                                       2
<PAGE>
 
                                 SCHEDULE 2.1
                                 ------------
                                        
                                Bank Commitments
<TABLE>
<CAPTION>
Banks                              Commitment      Pro Rata Share
- ------------------------------   ---------------   ---------------
<S>                              <C>               <C>
 
ABN AMRO Bank N.V.               $ 30,000,000.00               20%
 
Banca Commerciale Italiana,      $ 25,000,000.00      16.66666667%
Los Angeles Foreign Branch
 
Bank of America NT&SA            $ 30,000,000.00               20%
 
Sanwa Bank, Limited,             $ 15,000,000.00               10%
Los Angeles Branch
 
Citicorp USA, Inc.               $ 50,000,000.00      33.33333333%
 
     TOTAL                       $150,000,000.00              100%
</TABLE>

                      Commitments and Pro Rata Shares for
                          Letters of Credit Issued by
                               Citicorp USA, Inc.
<TABLE>
<CAPTION>
Banks                              Commitment      Pro Rata Share
- ------------------------------   ---------------   ---------------
<S>                              <C>               <C>
 
ABN AMRO Bank N.V.               $ 30,000,000.00               20%
 
Banca Commerciale Italiana,      $ 25,000,000.00      16.66666667%
Los Angeles Foreign Branch
 
Bank of America NT&SA            $ 30,000,000.00               20%
 
Sanwa Bank, Limited,             $ 15,000,000.00               10%
Los Angeles Branch
 
Citicorp USA, Inc.               $ 50,000,000.00      33.33333333%
 
     TOTAL                       $150,000,000.00              100%
</TABLE>
<PAGE>
 
                                 SCHEDULE 4.4
                                 ------------

                                  Subsidiaries


Subsidiaries of Amgen Inc.
- --------------------------

1.  AMGEN BOULDER DEVELOPMENT CORPORATION, a Colorado corporation having a
principal business address of 3200 Walnut Street, Boulder, Colorado 80301-2546,
is a wholly owned subsidiary of Amgen Inc.; has 1,000 shares of capital stock
issued and outstanding.

2.  AMGEN BOULDER PRODUCTION CORPORATION, a Colorado corporation, having a
principal business address of 3200 Walnut Street, Boulder, Colorado 80301-2546,
is a wholly owned subsidiary of Amgen Inc.; has 1,000 shares of capital stock
issued and outstanding.

3.  AMGEN CAMBRIDGE REAL ESTATE HOLDINGS INC., a Delaware corporation, is a
wholly owned subsidiary of Amgen Inc.; has a principal business address of One
Amgen Center Drive, Thousand Oaks, California 91320-1789; has 100 shares of
capital stock issued and outstanding.

4.  AMGEN HOLDING, INC., a California corporation, is a wholly owned subsidiary
of Amgen Inc.; has a principal business address of One Amgen Center Drive,
Thousand Oaks, California 91320-1789; and is currently an inactive corporation;
has 100 shares of capital stock issued and outstanding.

5.  AMGEN INTERNATIONAL INC., a Delaware corporation, is a wholly owned
subsidiary of Amgen Inc.; has a principal business address of One Amgen Center
Drive, Thousand Oaks, California 91320-1789; has 100 shares of capital stock
issued and outstanding.

6.  AMGEN KABUSHIKI KAISHA, a Japanese corporation, is a wholly owned subsidiary
of Amgen Inc.; has a principal business address of Hamacho Center Building, 13F,
2-31-1 Nihonbashi Hamacho, Chuo-ku, Tokyo 103, Japan; has 9,500 shares of
capital stock issued and outstanding.

7.  AMGEN PUERTO RICO, INC., a Delaware corporation, is a wholly owned
subsidiary of Amgen Inc.; has a principal business address of State Road 31,
Kilometer 24.6, Juncos, Puerto Rico 00777-4060; has 100 shares of capital stock
issued and outstanding.

8.  AMGEN SALES CORPORATION, a Barbados corporation and a foreign sales
corporation, is a wholly owned subsidiary of Amgen, Inc.; has a principal
business address of  c/o Corporate Services Limited, Collymore Rock, St.
Michael, Barbados, West Indies; has 1,000 shares of capital stock issued and
outstanding.
<PAGE>
 
9.  SYNERGEN EUROPE INC., a Colorado corporation, having a principal business
address of 3200 Walnut Street, Boulder, Colorado 80301-2546, is a wholly owned
subsidiary of Amgen Inc.; has 1,000 shares of capital stock issued and
outstanding.

SUBSIDIARIES OF SYNERGEN EUROPE INC.
- ------------------------------------

1.  SYNERGEN B.V., a Dutch corporation, having a principal business address of
Koningennegracht 61-62, 2414 AE The Hague, The Netherlands, is a wholly owned
subsidiary of Synergen Europe, Inc.; has no shares of capital stock issued and
outstanding.

2.  SYNERGEN S.P.A., an Italian corporation, having a principal business address
of Amgen Inc., One Amgen Center Drive, Thousand Oaks, California  91320-1789.

SUBSIDIARIES OF AMGEN INTERNATIONAL INC.
- ----------------------------------------

1.  AMGEN AB, a Swedish corporation, wholly owned by Amgen International Inc.;
having a principal business address of Ralambsvagen 17, P.O. Box 34107, 100-26
Stockholm, Sweden; has 3,000 shares of capital stock issued and outstanding.

2.  AMGEN AUSTRALIA PTY LIMITED, an Australian corporation, is owned 96% by
Amgen International Inc. and 4% by Amgen Inc. with respect to the issued and
outstanding common stock; is owned 100% by Amgen International Inc. with respect
to the issued and outstanding preferred stock; has a principal business address
of Level 3, 65 Epping Road, P.O. Box 410, North Ryde, Sydney NSW 2113,
Australia; has 250 shares of common stock and 210 shares of preferred stock
issued and outstanding.

3.  AMGEN - BIO-FARMACEUTICA, LDA., a Portuguese corporation, is owned 90% by
Amgen International Inc. and 10% by Amgen (Europe) AG; has a principal business
address of Av dos Combatentes, 43 A, 1 Esq., 1600 Lisbon, Portugal; has
10,000,000 shares of capital stock issued and outstanding.

4.  AMGEN B.V., a Dutch corporation, is a wholly owned subsidiary of Amgen
International Inc.; has a principal business address of Elleboog 56, P.O. Box
3345, 4800 DH Breda, The Netherlands; has 490 shares of capital stock issued and
outstanding.

5.  AMGEN CANADA INC., a Canadian corporation, is owned 99% by Amgen
International Inc. and 1% by Amgen Inc.; has a principal business address of
6733 Mississauga Road, Suite 303, Mississauga, L5N 6J5, Canada; has 100 shares
of capital stock and 7,000,000 preference shares issued and outstanding.

6.  AMGEN CARIBE CORPORATION, a Puerto Rico corporation, is wholly owned by
Amgen International Inc., has a principal business address of State Road 31,
Kilometer 24-6, Juncos, Puerto Rico, 00777-4060; has 1,000 shares of capital
stock issued and outstanding.
<PAGE>
 
7.  AMGEN (EUROPE) AG, a Swiss corporation, is owned 99.85% by Amgen
International Inc.; has a principal address of Alpenquai 30, P.O. Box 2065, 6002
Lucerne, Switzerland; has 2,000 shares of capital stock issued and outstanding.

8.  AMGEN EUROPE B.V., a Dutch corporation, is a wholly owned subsidiary of
Amgen International Inc.; has a principal business address of European Logistics
Center, Minervum 1150, 4817 ZG Breda, The Netherlands; has 300 shares of capital
stock issued and outstanding.

9.  AMGEN GMBH (AUSTRIA), an Austrian corporation, is owned 99.96% by Amgen
International Inc.; has a principal business address of Handelskai 388, Top 652,
A-1020 Vienna Austria; has 2,450 shares of capital stock issued and outstanding.

10.  AMGEN GMBH, a German corporation, has no shares of capital stock issued and
outstanding; has a principal business address of Riesstrasse 25, 80992 Munich,
Germany.

11.  AMGEN GREATER CHINA, LTD., a Hong Kong corporation, is owned 99.99% by
Amgen International Inc. and less than 1% by Amgen Inc.; has a principal
business address of Rm 1501-4, 15/F, Dah Sing Financial Centre, 108 Gloucester
Road, Wanchai, Hong Kong; has 5,360,000 shares of capital stock issued and
outstanding.

12.  AMGEN LIMITED, a United Kingdom corporation, is owned 99.99% by Amgen
International Inc.; has a principal business address of 240 Cambridge Science
Park, Milton Road, Cambridge CB4 4WD, United Kingdom; has 2,900,000 shares of
capital stock issued and outstanding.

13.  AMGEN N.V., a Belgian corporation, is owned 99.99% by Amgen International
Inc.; has a principal business address of 5 Avenue Ariane, B-1200 Brussels,
Belgium; has 7,000 shares of capital stock issued and outstanding.

14.  AMGEN S.A., a French corporation, is owned 99.97% by Amgen International
Inc. and less than 1% by each of Amgen Inc., Amgen (Europe) AG, Amgen B.V.,
Amgen GmbH and Amgen Limited; has a principal business address of 192 avenue
Charles de Gaulle, 92200 Neuilly-sur-Seine, France; has 20,500 shares of capital
stock issued and outstanding.

15.  AMGEN S.A., a Spanish corporation, is owned 99.99% by Amgen International
Inc.; has a principal business address of Avda. Diagonal, 429, 4 degrees, 08036
Barcelona, Spain; has 54,000 shares of capital stock issued and outstanding.

16.  AMGEN S.P.A., an Italian corporation, is owned 98% by Amgen International
Inc. and 2% by Amgen (Europe) AG; has a principal business address of Via
Vitruvio, 38, 20124 Milano, Italy; has 499,000 shares of capital stock issued
and outstanding.
<PAGE>
 
JOINT VENTURES
- --------------

1.  KIRIN-AMGEN, INC., a Delaware corporation, is owned 50% by Amgen Inc. and
50% by Kirin Brewery Company, Ltd.; has a principal business address of c/o
Amgen (Europe) AG, Alpenquai 30, P.O. Box 2065, 6002 Lucerne, Switzerland; has
1,000 shares of capital stock issued and outstanding.

2.  AMGEN-REGENERON PARTNERS, a Delaware general partnership, is owned 50% by
Amgen Inc. and 50% by Regeneron Pharmaceuticals Inc. and has a principal
business address of One Amgen Center Drive, Thousand Oaks, California 91320-
1789.
<PAGE>
 
                                 SCHEDULE 4.8
                                 ------------
                                        
                                   LITIGATION
                                        
None.

                                       1

<PAGE>
 
                                 SCHEDULE 4.15
                                 -------------

                             ENVIRONMENTAL MATTERS
                                        

None.
<PAGE>
 
                                 SCHEDULE 6.5
                                 ------------

                           LIENS AND RIGHTS OF OTHERS
                                        

None.


<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED FINANCIAL STATEMENTS CONTAINED IN THE COMPANY'S QUARTERLY
REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 1998 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL INFORMATION.
</LEGEND>
<MULTIPLIER> 1,000,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                             158
<SECURITIES>                                       863
<RECEIVABLES>                                      307
<ALLOWANCES>                                        16
<INVENTORY>                                        113
<CURRENT-ASSETS>                                 1,568
<PP&E>                                           1,897
<DEPRECIATION>                                     547
<TOTAL-ASSETS>                                   3,287
<CURRENT-LIABILITIES>                              867
<BONDS>                                            223
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                       2,197
<TOTAL-LIABILITY-AND-EQUITY>                     3,287
<SALES>                                          1,178
<TOTAL-REVENUES>                                 1,262
<CGS>                                              163
<TOTAL-COSTS>                                      163
<OTHER-EXPENSES>                                   556
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   6
<INCOME-PRETAX>                                    577
<INCOME-TAX>                                       173
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       404
<EPS-PRIMARY>                                     1.58
<EPS-DILUTED>                                     1.53
        

</TABLE>

<PAGE>
 
                                                                      EXHIBIT 99

                                   AMGEN INC.

                      FACTORS THAT MAY AFFECT THE COMPANY

Factors That May Affect the Company

     Amgen operates in a rapidly changing environment that involves a number of
risks, some of which are beyond the Company's control.  The following discussion
highlights some of these risks and others are discussed elsewhere herein.

  Product development

     The Company intends to continue an aggressive product development program.
Successful product development in the biotechnology industry is highly
uncertain, and only a small minority of research and development programs
ultimately result in the commercialization of a product.  Of the candidates that
are selected for product development, all will not be successfully
commercialized.  Product candidates that appear promising in the early phases of
development may fail to reach the market for numerous reasons, including,
without limitation, results indicating lack of effectiveness or harmful side
effects in clinical or preclinical testing, failure to receive necessary
regulatory approvals, uneconomical manufacturing costs, the existence of third
party proprietary rights, failure to be cost effective in light of existing
therapeutics, or other factors.  There can be no assurance that the Company will
be able to produce future products that have commercial potential.
Additionally, success in preclinical and early clinical trials does not ensure
that large scale clinical trials will be successful.  For example, the Company
has previously announced product development failures in connection with BDNF
(for subcutaneous injection for ALS), a product candidate that did not produce
acceptable clinical results in a specific indication with a specific route of
administration after a Phase III trial; although this product candidate had
demonstrated acceptable preclinical and earlier clinical trial results
sufficient to warrant advancement to a later stage clinical trial.  Further,
clinical results are frequently susceptible to varying interpretations which may
delay, limit or prevent further clinical development or regulatory approvals.
The length of time necessary to complete clinical trials and receive approval
for product marketing by regulatory authorities varies significantly by product
and indication and is often difficult to predict.  See "- Regulatory approvals".

  Regulatory approvals

     The Company's research and development, preclinical testing, clinical
trials, facilities, manufacturing, pricing, and sales and marketing of its
products are subject to extensive regulation by numerous state and federal
governmental authorities in the U.S., such as the FDA, HCFA, as well as by
foreign countries, including the EU.  The success of the Company's current
products and future product candidates will depend in part upon obtaining and
maintaining regulatory approval to market products in approved indications.  The
regulatory approval process can be both a long and complex process, 

                                       1
<PAGE>
 
both in the U.S. and in foreign countries, including countries in the EU. Even
if regulatory approval is obtained, a marketed product and its manufacturer are
subject to continued review. Later discovery of previously unknown problems with
a product or manufacturer may result in restrictions on such product or
manufacturer, including withdrawal of the product from the market. Failure to
obtain necessary approvals, or the restriction, suspension or revocation of any
approvals or the failure to comply with regulatory requirements could have a
material adverse effect on the Company.

  Reimbursement; Third party payors

     In both domestic and foreign markets, sales of the Company's products are
dependent in part on the availability of reimbursement from third party payors
such as state and federal governments (for example, under Medicare and Medicaid
programs in the United States) and private insurance plans.  In certain foreign
markets, pricing and profitability of prescription pharmaceuticals are subject
to government controls.  In the United States, there have been, and the Company
expects there to continue to be, a number of state and federal proposals to
implement price controls.  In addition, an increasing emphasis on managed care
in the United States has and will continue to increase the pressure on
pharmaceutical pricing and usage.  Further, significant uncertainties exist as
to the reimbursement status of newly approved therapeutic products and current
reimbursement policies for existing products may change.  Changes in
reimbursement or failure to obtain reimbursement may reduce the demand for, or
the price of, the Company's products which could have a material adverse effect
on the Company including results of operations.  For example, patients in the
U.S. receiving EPOGEN(R) in connection with treatment for end stage renal
disease are covered primarily under medical programs provided by the federal
government.  Therefore, EPOGEN(R) sales may be affected by future changes in
reimbursement rates or the basis for reimbursement by the federal government.
As the Company previously announced, in early 1997, HCFA instituted a
reimbursement change for EPOGEN(R) which has adversely affected the Company's
EPOGEN(R) sales.  See "Item 7. Management's Discussion and Analysis of Financial
Condition and Results of Operations - Results of Operations - Product Sales -
EPOGEN(R) (Epoetin alfa)".

  Guidelines

     In addition to government agencies that promulgate regulations and
guidelines directly applicable to the Company and its products, professional
societies, practice management groups, private health/science foundations and
organizations involved in various diseases may also publish, from time to time,
guidelines or recommendations to the health care and patient communities.  These
organizations may make recommendations that affect the usage of certain
therapies, drugs or procedures, including the Company's products.  Such
recommendations may relate to such matters as usage, dosage, route of
administration and use of concomitant therapies.  Recommendations or guidelines
that are followed by patients and health care providers and that result in,
among other things, decreased use of the Company's products could have a
material adverse effect on the Company's results of operations.  In addition,
the perception that such recommendations 

                                       2
<PAGE>
 
or guidelines will be followed could adversely affect prevailing market prices
for the Company's common stock.

  Intellectual property and legal matters

     The patent positions of pharmaceutical and biotechnology companies can be
highly uncertain and often involve complex legal, scientific and factual
questions.  To date, there has emerged no consistent policy regarding breadth of
claims allowed in such companies' patents.  Accordingly, there can be no
assurance that patents and patent applications relating to the Company's
products and technologies will not be challenged, invalidated or circumvented or
will afford protection against competitors with similar products or technology.
Patent disputes are frequent and can preclude commercialization of products.
The Company currently is, and may in the future be, involved in patent
litigation.  Such litigation, if decided adversely, could subject the Company to
competition and/or significant liabilities, could require the Company to enter
into third party licenses or could cause the Company to cease using the
technology or product in dispute.  In addition, there can be no assurance that
such licenses will be available on terms acceptable to the Company, or at all.

     The Company is currently involved in arbitration proceedings with Ortho
Pharmaceutical Corporation, a subsidiary of Johnson & Johnson ("Johnson &
Johnson"), relating to a license granted by the Company to Johnson & Johnson for
sales of Epoetin alfa in the United States for all human uses except dialysis
and diagnostics.  See Note 4 to the Consolidated Financial Statements,
"Contingencies - Johnson & Johnson arbitrations".

  Competition

     Amgen operates in a highly competitive environment.  The Company competes
with pharmaceutical and biotechnology companies, some of which may have
technical or competitive advantages for, among other things, the development of
technologies and processes and the acquisition of technology from academic
institutions, government agencies and other private and public research
organizations.  There can be no assurance that the Company will be able to
produce or acquire rights to products that have commercial potential.  Even if
the Company achieves product commercialization, there can be no assurance that
one or more of the Company's competitors will not achieve product
commercialization earlier than the Company, receive patent protection that
dominates or adversely affects the Company's activities, or have significantly
greater marketing capabilities.

  Fluctuations in operating results

     The Company's operating results may fluctuate from period to period for a
number of reasons.  Historically the Company has planned its operating expenses,
many of which are relatively fixed in the short term, on the basis that revenues
will continue to grow.  Accordingly, even a relatively small revenue shortfall
may cause a period's results to be below Company expectations.  Such a revenue
shortfall could arise from any number of factors, including, without limitation,
lower than expected demand, changes in wholesaler buying patterns, changes in
product pricing strategies, increased competition from new and existing

                                       3
<PAGE>
 
products, fluctuations in foreign currency exchange rates, changes in government
or private reimbursement, transit interruptions, overall economic conditions or
natural disasters (including earthquakes).

  Rapid growth

     The Company has adopted an aggressive growth plan that includes substantial
and increased investments in research and development and investments in
facilities that will be required to support significant growth.  This plan
carries with it a number of risks, including a higher level of operating
expenses and the complexities associated with managing a larger and faster
growing organization.

  Stock price volatility

     The Company's stock price, like that of other biotechnology companies, is
subject to significant volatility.  The stock price may be affected by, among
other things, clinical trial results and other product development related
announcements by Amgen or its competitors, regulatory matters, announcements in
the scientific and research community, intellectual property and legal matters,
changes in reimbursement policies or medical practices or broader industry and
market trends unrelated to the Company's performance.  In addition, if revenues
or earnings in any period fail to meet the investment community's expectations,
there could be an immediate adverse impact on the Company's stock price.

                                       4


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