Document:

<PAGE>   1
                                                                   EXHIBIT 10.20

                               SECOND AMENDMENT TO
                               -------------------
                      CHANGE IN CONTROL SEVERANCE AGREEMENT
                      -------------------------------------

         THIS AGREEMENT ("Second Amendment") is made as of February 9, 2000, by
and among Allegiance Corporation, a Delaware corporation ("Company"), Cardinal
Health, Inc., an Ohio corporation ("Cardinal"), and Joseph F. Damico
("Employee").

         WHEREAS, Company and Employee entered into a change in control
severance agreement under the Allegiance Corporation Change in Control Plan (the
"CIC Plan"), effective as of October 1, 1996 (the "Original Agreement"), which
Original Agreement was amended as of October 8, 1998 by and between Company,
Cardinal and Employee (the "First Amendment") (the Original Agreement as amended
by the First Amendment is hereinafter referred to as the "Change in Control
Agreement"); and

         WHEREAS, Company, Cardinal and Employee have determined to further
amend the Change in Control Agreement by this Second Amendment;

         NOW, THEREFORE, in consideration of these mutual premises and the
mutual and dependent promises hereinafter set forth, the parties hereto agree as
follows:

         1. SUPPLEMENT TO CHANGE IN CONTROL AGREEMENT. This Second Amendment
incorporates by reference the Change in Control Agreement, including all
Exhibits thereto. Any capitalized word used but not defined herein shall have
the meaning ascribed to it in the Change in Control Agreement. All references to
Section numbers of the Change in Control Agreement set forth in this Second
Amendment reference Sections of the Original Agreement. This Second Amendment is
intended to amend and supplement the Change in Control Agreement and is intended
to be interpreted and applied consistent with the terms of the Change in Control
Agreement unless specifically indicated otherwise herein. To the extent there is
any inconsistency between this Second Amendment and the Change in Control
Agreement, however, this Second Amendment shall control.

         2. A new Section 21 is hereby added to the Change in Control Agreement
which reads as follows:

                  21. PART-TIME PERIOD. Employee may, at his option, elect to
         change his status to that of a consulting employee, if (i) Employee's
         employment is terminated by Company without Cause during the Full-Time
         Period (defined below), or (ii) the Full-Time Period expires on
         February 9, 2001 according to its terms. The "Full-Time Period" is
         defined as that period beginning on February 9, 2000 and ending on
         February 9, 2001. In the event that Employee exercises his right to
         change his status to that of a consulting employee, then Employee shall
         become a consulting employee without experiencing any break in
         Employee's status as an employee of Company (the period during which
         Employee serves as a consulting employee, if any, the "Part-Time
         Period"). During the Part-Time Period, as compensation for Employee's
         services as a consulting employee,

                                      -1-
<PAGE>   2

         Company shall pay Employee $1,000 per month, payable at such times and
         intervals as Company customarily pays the base salaries of its other
         executive employees ("Consulting Base Salary"). Employee's ability to
         serve as a consulting employee is conditioned upon his continuing
         compliance with the obligations set forth in Section 5 of the Change in
         Control Agreement. Notwithstanding the foregoing, during such Part-Time
         Period, provided Employee is and remains in compliance with Section 5
         of the Change in Control Agreement (i) nothing herein shall be deemed
         to preclude Employee from engaging in any other business, profession or
         occupation so long as such business, profession or occupation is
         consistent with the requirements of Section 5 of the Change in Control
         Agreement and (ii) Company may not terminate Employee other than for
         Cause. The Part-Time Period, if any, shall terminate on February 9,
         2003 and in no event shall Employee be entitled to any rights or
         benefits from or after such date, except to the extent he remains
         entitled to any amounts deferred hereunder. Any stock options held by
         Employee will continue to vest in accordance with their terms during
         the Part-Time Period.

         3. A new Section 22 is hereby added to the Change in Control Agreement
which reads as follows:

                  22. ADDITIONAL INCENTIVE BONUS AND STAY BONUS. (a) If Employee
         remains employed by Company on either a full-time or consulting basis
         through February 9, 2001, or if Employee is terminated without Cause by
         Company prior to February 9, 2001, Employee shall be paid an amount
         (the "Additional Incentive Bonus") equal to the sum of (i) Employee's
         base salary as in effect on February 9, 2000 (i.e., $475,000) and (ii)
         Employee's target annual bonus for fiscal year 2000 under the bonus
         plan for which Employee is eligible on February 9, 2000, calculated on
         a full year basis based upon the target bonus percentage in effect on
         February 9, 2000 (i.e., $565,250). The Additional Incentive Bonus, if
         payable, shall be paid as soon as administratively practicable but in
         no case later than April 14, 2001.

              (b) In addition to the base salary or Consulting Base Salary,
         as applicable, and the Additional Incentive Bonus, if Employee remains
         employed by Company on either a full-time or consulting basis through
         February 9, 2001, or if Employee is terminated without Cause by Company
         prior to February 9, 2001, Employee shall earn a stay bonus (the "Stay
         Bonus") in the amount of $570,750.

         4. Section 2 of the Change in Control Agreement is hereby deleted in
its entirety and the following provisions are substituted therefor:

                  2. BENEFITS PAYABLE HEREUNDER.

                  (a) AGREEMENT BONUS. As soon as administratively practicable
         but in no case later than August 15, 2000, Employee shall be paid
         $50,000 in consideration for execution of this Second Amendment (the
         "Agreement Bonus").

                  (b) NONCOMPETITION PAYMENT. In consideration for Employee's
         obligations set

                                      -2-
<PAGE>   3

         forth in Section 5 of the Change in Control Agreement, Company shall
         pay Employee a "Noncompetition Payment" in an amount equal to
         $2,500,000 plus an amount equal to Employee's bonus plan potential for
         Company's fiscal year 2001 which shall be calculated at a level not
         less than the target percentage in effect on July 1, 2000 (i.e.,
         $565,250). The payment of the Noncompetition Payment is conditioned
         upon Employee's continuing compliance with the obligations set forth in
         Section 5 of the Change in Control Agreement.

                  (c) PAYMENT OF STAY BONUS AND NONCOMPETITION PAYMENT. The Stay
         Bonus provided for in Section 22 and Noncompetition Payment provided
         for in Section 2(b), each if earned, shall be paid not later than July
         31, 2001. Notwithstanding the fact that Employee's obligations under
         Section 5 of the Change in Control Agreement and his liability for
         violations thereof extend beyond July 31, 2001, Employee shall be paid
         the Noncompetition Payment as set forth in the immediately preceding
         sentence if he is in compliance with such covenants on the payment
         date.

         5. (a) The introductory paragraph to Section 5 and subsections (a) and
(b) of Section 5 of the Change in Control Agreement are each hereby deleted and
replaced in their entirety as follows:

                  NON-SOLICITATION AND NON-COMPETITION. In consideration for the
         benefits called for under Sections 2, 3, and 22 of this Change in
         Control Agreement, Employee agrees that Employee shall not:

              (a) at any time during the Full-Time Period and an additional
              period that ends upon the later of (i) 12 months following (x) the
              last day of the Full-Time Period or (y) the date of termination if
              Employee is terminated without Cause prior to the expiration of
              the Full-Time Period and (ii) 24 months following the end of the
              month in which the Cardinal Merger is consummated, without the
              prior written consent of Cardinal, alone or association with
              others, solicit on behalf of Employee, or any other person, firm,
              corporation or entity, any employee of Company or Cardinal or any
              of their subsidiaries, partnerships, joint ventures, limited
              liability companies, or other affiliates (collectively, the
              "Cardinal Group"); and

              (b) at any time during the Full-Time Period and an additional
              period that ends 24 months after (i) the last day of the Full-Time
              Period or (ii) the date of termination if Employee is terminated
              without Cause prior to the expiration of the Full-Time Period,
              without the prior written consent of Cardinal, directly or
              indirectly, engage or invest in, counsel or advise or be employed
              by any of the entities set forth on Exhibit A attached to this
              Agreement (the "Listed Entities"), or by any person, entity, firm
              or corporation which is now an affiliate of any of the Listed
              Entities, until such time as such Listed Entity is acquired or
              consolidated with any entity other than any of the Listed
              Entities. Notwithstanding the foregoing, Employee shall be
              entitled to passively own not more than four and nine-tenths
              percent (4.9%) of any of the Listed Entities.

                                      -3-
<PAGE>   4

         (b) The remainder of Section 5 not modified by the foregoing shall
remain in full force and effect.

         6. The last sentence of Section 6 of the Change in Control Agreement is
hereby deleted and replaced in its entirety as follows:

                  Payment to Employee of the Agreement Bonus, Noncompetition
         Payment, Additional Incentive Bonus, and Stay Bonus, each if earned,
         and, if any, the Consulting Base Salary and Gross-Up Payment, shall
         constitute the entire obligation of Company and Cardinal (other than
         for vested benefits and, in accordance with their terms, stock based
         incentives) to Employee under the Change in Control Agreement and full
         settlement of any claim under law or in equity that Employee might
         otherwise assert against Company or Cardinal or any of its employees,
         officers or directors on account of Employee's employment or departure
         from the Cardinal Group.

         7. Section 8 of the Change in Control Agreement is hereby deleted and
replaced in its entirety as follows:

               8. TERMINATION FOR CAUSE AND GOOD REASON. Employee will be
               considered to have been terminated for "Cause" if the
               termination is by reason of Employee willfully engaging in
               conduct demonstrably and materially injurious to the Cardinal
               Group, Employee being convicted of or confessing to a crime
               involving dishonesty or moral turpitude, Employee's failure to
               comply with any of the obligations set forth in Section 5 of
               this Change in Control Agreement, or Employee's willful and
               continued failure for a significant period of time to perform
               Employee's duties after a demand for substantial performance
               has been delivered to Employee by the Board of Directors of
               Company which demand specifically identifies the manner in
               which the Board believes that Employee has not substantially
               performed his duties. Employee's termination shall be
               considered to have been for "Good Reason" if Employee's
               termination is by reason of the occurrence of any of the
               following events during the Part-Time Period without
               Employee's express written consent:

               (a)      the failure by Company to provide Employee with the
                        compensation and benefits provided for in this Change
                        in Control Agreement;

               (b)      any material breach by Company of this Change in
                        Control Agreement; and

               (c)      the failure of Company to obtain a satisfactory
                        agreement from any successor or assign of Company to
                        assume and agree to perform this Change in Control
                        Agreement, as required in Section 10 of this Change
                        in Control Agreement.

               If, during the Part-Time Period, Employee elects to terminate
               Employee's employment for Good Reason, Employee shall so
               notify Cardinal in writing after the occurrence of the event
               constituting Good Reason, specifying the basis for such
               termination. If Cardinal fails, within ten (10) days after
               receiving such written notice, to remedy the facts and
               circumstances that provided Good Reason, Employee's

                                      -4-
<PAGE>   5

               employment shall be deemed to have terminated for Good Reason
               on the tenth day after Cardinal receives such written notice.
               If, during the Part-Time Period, Cardinal does remedy such
               facts and circumstances within such ten (10) days, Employee
               shall be deemed to no longer have Good Reason, and shall
               continue in the employ of Company as if no notice had been
               given.

         8. In the event that Cardinal and Employee agree that Employee shall
continue as a full-time employee of Company after February 9, 2001, Company,
Cardinal and Employee agree to further modify the Change in Control Agreement in
a mutually acceptable manner to take into account such extension of full-time
employment. In the event there is a Change in Control of Company or Cardinal
other than the Cardinal Merger, Employee shall not be entitled to any new or
additional benefits under the CIC Plan, Change in Control Agreement, or this
Second Amendment.

         9. All references to Change in Control Agreement in this Second
Amendment shall, to the extent required by the context, be deemed to include the
changes made by this Second Amendment.

IN WITNESS WHEREOF, Company, Cardinal and Employee have signed this Second
Amendment as of the date first written above.

ALLEGIANCE CORPORATION                            CARDINAL HEALTH, INC.

By: /s/ Anthony J. Rucci                          By:  /s/ Robert D. Walter
    -----------------------------------                -------------------------
    Anthony J. Rucci                                   Robert D. Walter
    Executive Vice President - Administration          Chairman and Chief
                                                       Executive Officer

/s/ Joseph F. Damico
------------------------------------
Joseph F. Damico

                                      -5-
<PAGE>   6

                                                                       EXHIBIT A

AmeriSource
Bergen Brunswig (including Bergen Medical and any
         successor in interest to the Bergen Medical business)
Bindley Western
C.D. Smith
D & K Healthcare
McKesson (including General Medical and any
         successor in interest to the General Medical business)
Morris & Dickson
Neuman
Owens & Minor
Omnicell
PSS World Medical
Henry Schein
Medline
Diebold
ServiceMaster
Fischer Scientific
Maxxim
Safeskin
DeRoyal
VWR

                                      -6-<PAGE>   1
                                                                   EXHIBIT 10.24

                     CREDIT SUISSE FIRST BOSTON CORPORATION

[CREDIT SUISSE LOGO]

                     Eleven Madison Avenue            Telephone (212) 325 5900
                     New York, NY 10010-3629          Facsimile (212) 325-8176/7

                                                                  March 16, 2000

Cardinal Health, Inc.
7000 Cardinal Place
Dublin, Ohio 43017

Attn: Richard J. Miller
      Executive Vice President
      and Chief Financial Officer

Credit Suisse Financial Products
One Cabot Square
London E14 4QJ
England

--------------------------------------------------------------------------------

Dear Sirs:

The purpose of this telecopy (this "Confirmation") is to confirm the terms and
conditions of the Transaction entered into between Credit Suisse Financial
Products ("Party A") and Cardinal Health, Inc.("Party B"), through Credit Suisse
First Boston Corporation ("CSFB") and its assigns as agent for both parties (in
such capacity, the "Agent"), on the Trade Date specified below (the
"Transaction"). This Confirmation constitutes a "Confirmation" as referred to in
the Agreement specified below.

1.       The definitions and provisions contained in the 1991 ISDA Definitions
         (as supplemented by the 1998 Supplement) (the "Definitions") as
         published by the International Swaps and Derivatives Association, Inc.,
         formerly the International Swap Dealers Association, Inc., are
         incorporated into this Confirmation. In the event of any inconsistency
         between the Definitions and this Confirmation, this Confirmation will
         prevail.

If Party A and Party B are parties to the 1992 ISDA Master Agreement (the
"Agreement"), this Confirmation supplements, forms a part of, and is subject to
such Agreement. If Party A and Party B are not yet parties to the Agreement,
Party A and Party B agree to use their best efforts promptly to negotiate,
execute, and deliver the Agreement with such modifications as Party A and Party
B shall in good faith agree. Upon execution and delivery by Party A and Party B
of the Agreement, this Confirmation shall supplement, form a part of, and be
subject to such Agreement. Until Party A and Party B execute and deliver the
Agreement, this Confirmation (together with all other Confirmations of
Transactions previously entered into between Party A and Party B,
notwithstanding anything to the contrary therein) shall supplement, form a part
of, and be subject to the 1992 ISDA Master Agreement, as if, on the Trade Date
of the first such Transaction between them, Party A and Party B had executed
that

<PAGE>   2
agreement (without any Schedule or Addendum thereto) and had specified that the
Automatic Early Termination provisions contained in Section 6(a) of such
agreement would not apply.

The Agreement and each Confirmation thereunder will be governed by and construed
in accordance with the laws of the State of New York, without reference to
choice of law doctrine and each party hereby submits to the jurisdiction of the
Courts of the State of New York.

Party A and Party B each represents to the other that it is entering into this
Transaction in reliance upon such accounting, regulatory, legal, tax and
financial advice as it deems necessary and not upon any view expressed by the
other.

2.       The terms of the particular Transaction to which this Confirmation
         relates are as follows:

         Number of Shares:          7,000,000

         Shares:                    The no par value common stock of Party B
                                    (sometimes also referred to as the "Issuer")

         Purchase of Shares         On the Trade Date, Party B will purchase the
                                    number of Shares from Party A or its
                                    designee in an over-the-counter transaction
                                    for a purchase price equal to $43.25 per
                                    Share.

         Trade Date:                March 16, 2000

         Effective Date:            Trade Date

         Termination Date:          The earlier of:

                                    (i)      the date that is three (3) Exchange
                                             Business Days following the first
                                             date upon which the sum of the
                                             Reference Share Amounts is equal to
                                             the Number of Shares; and

                                    (ii)     the Accelerated Termination Date;

                                    provided, however, that the Termination Date
                                    shall not be later than June 30, 2000,
                                    subject to the Adjustment to Termination
                                    Date and the Accelerated Termination
                                    provisions set out below and further subject
                                    to adjustment in accordance with the
                                    Modified Following Business Day Convention,

                                      -2-

<PAGE>   3
                                    unless there is a Market Disruption Event on
                                    that day, or a Settlement Disruption Event
                                    or Nationalization or Liquidation has
                                    occurred and is continuing on that day. In
                                    the case of any of the above, the
                                    Termination Date shall be rescheduled to a
                                    date determined by the Calculation Agent.

         Adjustment to
         Termination Date:          If a party determines that any date that
                                    would otherwise have been a Valuation Date
                                    is not a Valuation Date, in accordance with
                                    the terms of the Valuation Date provision
                                    set out in Appendix A, then the Termination
                                    Date shall be delayed by the number of
                                    Exchange Business Days equal to the number
                                    of dates for which such party makes such
                                    determination.

         Payment Date for
         both parties:              The Termination Date

         Period End Date for
         both parties:              The Termination Date

         Party A Floating
         Amount:                    An amount in U.S. Dollars equal to the sum
                                    of the Compounded Daily Strike Amounts for
                                    all Valuation Dates.

                                    As used herein, "Compounded Daily Strike
                                    Amount" means each Daily Strike Amount
                                    compounded at the LIBOR Rate in effect on
                                    the day which is three (3) Exchange Business
                                    Days after the applicable Valuation Date for
                                    the actual number of days elapsed from, and
                                    including, the day which is three (3)
                                    Exchange Business Days after the Valuation
                                    Date on which such Daily Strike Amount was
                                    determined to, but excluding, the
                                    Termination Date, any Early Termination Date
                                    or Accelerated Termination Date, as the case
                                    may be, divided by 360.

         Party B Floating Amount:   An amount in U.S. Dollars equal to the sum
                                    (a) the sum of the Compound Dividend Amounts
                                    (b) $1,059,625 and (c) the sum of the
                                    Compounded Daily Reference Amounts for all
                                    Valuation Dates.

                                    As used herein "Compounded Daily Reference
                                    Amount" means each Daily Reference Amount
                                    compounded at the LIBOR Rate in effect on
                                    the day

                                      -3-

<PAGE>   4
                                    which is three (3) Exchange Business Days
                                    after the applicable Valuation Date for the
                                    actual number of days elapsed from, and
                                    including, the day which is three (3)
                                    Exchange Business Days after the Valuation
                                    Date on which such Daily Reference Amount
                                    was determined to, but excluding, the
                                    Termination Date, any Early Termination Date
                                    or Accelerated Termination Date, as the case
                                    may be, divided by 360

         Dividend Amount:           The Dividend Amount shall be determined by
                                    the Calculation Agent in good faith and in a
                                    commercially reasonable manner and shall be
                                    equal to the Dividends multiplied by the
                                    Remaining Number of Shares on the Valuation
                                    Date immediately preceding the applicable
                                    ex-dividend date.

         Compound Dividend Amount:  An amount (whether in cash or in kind) with
                                    respect to each ex-dividend date equal to
                                    the product of: (x) the amount of any
                                    Dividend per Share having an ex-dividend
                                    date after the Effective Date and prior to
                                    the Termination Date, Accelerated
                                    Termination Date or Early Termination Date,
                                    as the case may be; and (y) the Remaining
                                    Number of Shares on the day immediately
                                    preceding the ex-dividend date for such
                                    Dividend; such amount being:

                                    (i)      in the case of Dividends with a
                                             payment date after the Termination
                                             Date, Accelerated Termination Date
                                             or Early Termination Date, as
                                             applicable: discounted at the LIBOR
                                             Rate for the number of days in the
                                             period commencing on and including
                                             the Termination Date, Early
                                             Termination Date or Accelerated
                                             Termination Date, as applicable, to
                                             but excluding the date that holders
                                             of the Shares receive such
                                             Dividend, divided by 360; and

                                    (ii)     in the case of Dividends with a
                                             payment date prior to the
                                             Termination Date: compounded at the
                                             LIBOR Rate for the number of days
                                             in the period commencing on and
                                             including the date that holders of
                                             the Shares receive such Dividend,
                                             to but excluding the Termination

                                      -4-

<PAGE>   5
                                             Date, Accelerated Termination Date
                                             or Early Termination Date, as
                                             applicable, divided by 360.

         Remaining Number
         of Shares:                 For any Exchange Business Day, a number of
                                    Shares equal to the Number of Shares minus
                                    the sum of the Reference Share Amounts for
                                    each of the Valuation Dates occurring in the
                                    period commencing on the Effective Date to
                                    and including such Exchange Business Day,
                                    or, in the case of an Accelerated
                                    Termination as described below, exclusive of
                                    the Accelerated Termination Date.

         Cash Settlement:           Applicable, provided, that Party B may
                                    elect, upon seven (7) calendar days' prior
                                    written notice in accordance with the
                                    provisions of Section 12 of the Agreement,
                                    that Physical Settlement shall apply to this
                                    Transaction. If Party B makes such election,
                                    the terms of the Net Share Settlement
                                    provision specified in Appendix C shall
                                    apply. If, after electing Physical
                                    Settlement, the conditions set forth on
                                    Appendix B have not been satisfied on the
                                    Termination Date, Early Termination Date or
                                    Accelerated Termination Date, Cash
                                    Settlement shall apply.

         Business Days:             New York

         Calculation Agent:         Party A, whose determinations and
                                    calculations shall be binding in the absence
                                    of manifest error or lack of good faith. The
                                    Calculation Agent shall have no
                                    responsibility for good faith errors or
                                    omissions in making any determination as
                                    provided herein. All determinations and
                                    calculations by the Calculation Agent shall
                                    be made in good faith and in a commercially
                                    reasonable manner.

                                    Upon Party B's reasonable request, the
                                    Calculation Agent shall in good faith
                                    disclose to Party B any relevant materials
                                    or methods referenced by the Calculation
                                    Agent in making any determinations and/or
                                    calculations applicable to this Transaction.

         Credit Support Documents:  Party A: None
                                    Party B: None

                                      -5-

<PAGE>   6
         Clearance System:          The Depository Trust Company

         Reference Market-maker:    For the purposes of this Transaction, Party
                                    A shall be the sole Reference Market-maker
                                    in respect of any calculation to be made
                                    pursuant to Section 6 of the Agreement.

3.       Accelerated Termination.

         Accelerated Termination:   So long as a Market Disruption Event,
                                    Distribution Event or Share Liquidity Event
                                    shall not have occurred and be continuing,
                                    Party B shall have the right upon three (3)
                                    Business Days' notice to designate any
                                    Exchange Business Day as the Termination
                                    Date (the "Accelerated Termination Date").

         Payments Upon Accelerated
         Termination:               All amounts paid and delivery of Shares made
                                    in connection with any such Accelerated
                                    Termination Date shall be calculated by the
                                    Calculation Agent so as to preserve for the
                                    parties the economic benefits of this
                                    Transaction, as if this Transaction were
                                    amended so as to provide that the
                                    Accelerated Termination Date were the
                                    Termination Date. All deliveries of Shares
                                    by Party B in connection with any such
                                    Accelerated Termination Date shall satisfy
                                    the requirements of Appendix C hereto.

4.       Indemnification and Contribution

(a)      Indemnification by Party B.

         Party B agrees to indemnify and hold harmless Party A, its affiliates,
         their respective directors, officers, employees, agents, advisors,
         brokers and representatives and each person who controls Party A or its
         affiliates within the meaning of either the United States Securities
         Act of 1933, as amended (the "Securities Act") or the United States
         Securities Exchange Act of 1934, as amended (the "Exchange Act")
         against, and Party B agrees that no indemnified party shall have any
         liability to Party B or any of its affiliates, officers, directors, or
         employees for, any losses, claims, damages, liabilities (whether direct
         or indirect, in contract, tort or otherwise) or expenses, joint or
         several, to which any indemnified party may become subject under the
         Securities Act, the Exchange Act or other federal or state statutory
         law or regulation, at common law or otherwise, insofar as such losses,
         claims, damages, liabilities or expenses (or actions, claims,
         investigations or proceedings in respect thereof, whether commenced or
         threatened) (i) arise out of or relate to (A) actions or failures to
         act by Party B (including any misstatement or alleged

                                      -6-

<PAGE>   7
         misstatement of a material fact contained in a registration statement
         or a prospectus relating to the delivery of Shares of the Issuer upon
         an election by Party B of Physical Settlement, if any, or in any
         amendment thereof or supplement thereto, or omission or alleged
         omission to state therein a material fact required to be stated therein
         or necessary to make the statements therein not misleading) or (B)
         actions or failures to act by an indemnified party with the consent of
         Party B or (ii) otherwise arise out of or relate to this Transaction or
         any related transactions, provided that this clause (ii) shall not
         apply to the extent, but only to the extent, that any losses, claims,
         damages, liabilities or expenses of an indemnified party have resulted
         primarily from the gross negligence or wilful misconduct of such
         indemnified party in which case Party A shall indemnify Party B for any
         losses, claims, damages, liabilities (whether direct or indirect, in
         contract, tort or otherwise) or expenses which Party B may suffer as a
         result of such indemnified parties' gross negligence or wilful
         misconduct. Party B agrees to reimburse promptly each such indemnified
         party for any legal or other expenses reasonably incurred by them in
         connection with investigating or defending any such loss, claim,
         damages, liability, expense or action. Notwithstanding anything to the
         contrary in the foregoing, Party B will not be liable in any such case
         to the extent that any such loss, claim, damage, liability or expenses
         arises out of or is based upon any such untrue statement or alleged
         untrue statement or omission or alleged omission made in reliance upon
         and in conformity with written information furnished to Party B by or
         on behalf of Party A specifically for use in connection with the
         preparation of a prospectus or any supplement thereto. This indemnity
         agreement will be in addition to any liability which Party B may
         otherwise have.

(b)      Legal Proceedings.

         Party B shall not, without the prior written consent of Party A, effect
         any settlement of any pending or threatened proceeding in respect of
         which any indemnified party is or could have been a party and indemnity
         could have been sought hereunder by such indemnified party, unless such
         settlement includes an unconditional release of such indemnified party
         from all liability arising from such proceeding.

(c)      Contribution.

         If the indemnification provided for above is unavailable to an
         indemnified party in respect of any losses, claims, damages,
         liabilities or expenses referred to herein, then each applicable
         indemnifying party, in lieu of indemnifying such indemnified party,
         shall contribute to the amount paid or payable by such indemnified
         party as a result of such losses, claims, damages, liabilities or
         expenses, in such proportion as is appropriate to reflect not only the
         relative fault of Party B on the one hand and of Party A on the other
         in connection with the statements or omissions which resulted in such
         losses, claims, damages, expenses or liabilities, but also any other
         relevant equitable considerations. The relative fault of Party B on the
         one hand and Party A on the other shall be determined by reference to,
         among other things, whether the misstatement or alleged misstatement of
         a material fact or the omission or alleged omission to state a material
         fact relates to information supplied by Party B or by Party A and the
         parties' relative intent, knowledge,

                                      -7-

<PAGE>   8
         access to information and opportunity to correct or prevent such
         statement or omission. The amount paid or payable by a party as a
         result of the losses, claims, damages, liabilities and expenses
         referred to above shall be deemed to include any legal or other fees or
         expenses reasonably incurred by such party in connection with
         investigating or defending any action or claim. The parties agree that
         it would not be just and equitable if contribution pursuant to this
         paragraph (c) were determined by a method of allocation that does not
         take account of the equitable considerations referred to in this
         paragraph. No person guilty of fraudulent misrepresentation (within the
         meaning of Section 11(f) of the Securities Act) shall be entitled to
         contribution from any person who was not guilty of such fraudulent
         misrepresentation.

5.       Account Details:

         Payments to Agent:         Citibank NA
                                    ABA: 021-000-089
                                    A/c: 40804388
                                    A/c: Credit Suisse First Boston

         Payments to Party B:       Bank One, NA

                                    100 E. BROAD STREET

                                    COLUMBUS OH   43271

                                    044-000-037
                                    Name: Cardinal Health, Inc.
                                    A/C:   981875773

         Deliveries to Agent:       DTC 355
                                    Credit Suisse First Boston

6.       U.S. Private Placement Representations:

         As this Transaction constitutes, or may constitute, the sale by Party A
         to Party B, through the Agent, of a Security or Securities (as defined
         in the Securities Act), in addition to the representations contained in
         Section 3 of the Agreement, Party B hereby represents to Party A, in
         accordance with Section 3 of the Agreement, as follows:

         (a)      Party B is acquiring such Securities through the Agent for its
                  own account as principal, for investment purposes only, and
                  not with a view to, or for, resale, distribution or
                  fractionalisation thereof, in whole or in part, and no other
                  person has a direct or indirect beneficial interest in any
                  such Securities acquired by Party B through the Agent;

                                      -8-

<PAGE>   9
         (b)      Party B understands that the offer and sale by Party A,
                  through the Agent, of such Securities are intended to be
                  exempt from registration under the Securities Act, by virtue
                  of Section 4(2) thereof. In furtherance thereof, Party B
                  represents and warrants that (i) it has the financial ability
                  to bear the economic risk of its investment and has adequate
                  means of providing for its current needs and other
                  contingencies, (ii) it is experienced in investing in options
                  and similar instruments and has determined that such
                  securities are a suitable investment for it, and (iii) it is
                  an institution that qualifies as an "accredited investor" as
                  that term is defined in Regulation D under the Securities Act;
                  and

         (c)      Party B has been given the opportunity to ask questions of,
                  and receive answers from, Party A through the Agent concerning
                  the terms and conditions of such Securities and concerning the
                  financial condition and business operations of Party A and has
                  been given the opportunity to obtain such additional
                  information necessary in order for Party B to evaluate the
                  merits and risks of purchase of such Securities to the extent
                  Party A possesses such information or can acquire it without
                  unreasonable effort or expense.

         Party B hereby acknowledges that it understands and agrees that
         disposition of any such Securities is restricted under the Agreement,
         the Securities Act and state securities laws. For example, such
         Securities have not been registered under the Securities Act or under
         the securities laws of certain states and, therefore, cannot be resold,
         pledged, assigned or otherwise disposed of unless they have been
         registered under the Securities Act and under the applicable laws of
         such states or an exemption from such registration is available.

7.       The Agent:

(a)      As a broker-dealer registered with the Securities and Exchange
         Commission (the "SEC"), CSFB, in its capacity as Agent for Party A and
         Party B will be responsible for: (i) effecting this Transaction, (ii)
         issuing all required confirmations and statements to Party A and Party
         B, (iii) maintaining books and records relating to this Transaction as
         required by Rules 17a-3 and 17a-4 under the Exchange Act and (iv)
         unless otherwise requested by Party B, receiving, delivering and
         safeguarding any securities and funds of Party B in connection with
         this Transaction in compliance with Rule 15c3-3 under the Exchange Act.
         The parties agree that the Agent may assign all of its rights and
         delegate all of its obligations and duties under the Transaction to any
         Affiliate of Party A which is a broker-dealer registered with the SEC
         without the consent of either party.

(b)      CSFB is acting in connection with this Transaction solely as Agent for
         both Party A and Party B pursuant to instructions from them. CSFB shall
         have no responsibility or personal liability to Party A or Party B
         arising from any failure by Party A or Party B to pay or perform any
         obligation hereunder or to monitor or to enforce compliance by Party A
         or Party B with any obligation hereunder including, without limitation,
         any obligations to maintain collateral. Each of Party A and Party B
         agrees to proceed solely against the other to collect or recover any
         securities or money owing to it in connection with or as a

                                      -9-

<PAGE>   10
         result of this Transaction. CSFB shall otherwise have no liability in
         respect of this Transaction, except for its gross negligence, wilful
         misconduct or bad faith in performing its duties as Agent hereunder.

 (c)     Any and all notices, demands, or communications of any kind relating to
         this Transaction between Party A and Party B shall be transmitted
         exclusively through the Agent at the following address:

                     Credit Suisse First Boston Corporation
                                11 Madison Avenue
                               New York, NY 10010
                          Facsimile No: (212) 325-8175
                          Telephone No: (212) 325-8678
                            Attn: Ricardo A. Harewood

  (d)    The date and time of this Transaction will be furnished by the Agent to
         Party A and Party B upon written request.

  (e)    The Agent will furnish to Party A and Party B upon written request a
         statement as to the sources and amount of any remuneration received or
         to be received by it in connection with this Transaction.

  (f)    Party A and Party B each represents and agrees that this Transaction is
         not unsuitable for it in light of the information concerning such
         party's financial situation and investment objectives which have been
         furnished by such party to the Agent. Party A and Party B each agrees
         to notify the Agent of any material change in its investment objectives
         or financial situation.

Appendices A, B and C attached hereto are hereby incorporated into and made a
part of this Confirmation.

                                      -10-

<PAGE>   11
Please confirm that the foregoing correctly sets forth the terms of your
agreement by signing and returning to us a copy of this Confirmation.

                                     Yours sincerely,

                                     CREDIT SUISSE FIRST BOSTON CORPORATION
                                     solely in its capacity as Agent for
                                     Party A and Party B

                                     By: /S/ LINDA STEINMULLER
                                         -----------------------------
                                     Name:  Linda Steinmuller
                                     Title: Vice President

Agreed to as of the date first above written.

CARDINAL HEALTH, INC.

By: /S/ RICHARD J. MILLER
    -----------------------------
Name:  Richard J. Miller
Title: Corporate Vice President & CFO

Credit Suisse Financial Products

By: /S/ KAREN NEWTON
    -----------------------------
Name:  Karen Newton
Title: Vice President, Operations

                                      -11-

<PAGE>   12
                                   APPENDIX A
                                       TO
                          CONFIRMATION OF A TRANSACTION
                                     BETWEEN
                        CREDIT SUISSE FINANCIAL PRODUCTS
                                       AND
                              CARDINAL HEALTH, INC.
                        PARTY A REFERENCE EXT ID# 5748188

A.       Definitions
         -----------

         As used in this Confirmation, the following terms have the meanings set
         forth below:

         "Borrowing Rate" means, with respect to any day, the offer rate for
         borrowings of the Shares as determined by the Calculation Agent;

         "Daily Reference Amount" means, with respect to any Valuation Date, the
         Reference Share Amount for such Valuation Date multiplied by the
         Reference Price for such Valuation Date;

         "Daily Strike Amount" means, with respect to any Valuation Date, the
         Reference Share Amount for such Valuation Date multiplied by the Strike
         Price for the day that is three (3) Business Days after such Valuation
         Date;

         "Dividends" means an amount in U.S. Dollars equal to the dividends in
         kind or in cash paid by the Issuer per Share which is then outstanding
         (other than Dividends that result in an adjustment pursuant to Section
         B below).

         "Exchange" means the New York Stock Exchange or any successor reporting
         system.

         "Exchange Business Day" means a day that is a trading day on the
         Exchange;

         "LIBOR Rate" means, with respect to any day, the rate for deposits for
         a period of the Designated Maturity during the periods set forth below
         in U.S. Dollars which appears on Telerate Page 3750 as of 11:00 a.m.
         London time on the day that is two (2) London Banking Days preceding
         such day:

<TABLE>
<CAPTION>
              Period                                        Designated Maturity
              ------                                        -------------------
<S>                                                         <C>
         From, and including, the Effective Date                  2 Months
         to, and including, April 16, 2000:

         From, but excluding, April 16, 2000 to,                  1 Month
         and including, the Termination Date:
</TABLE>

                                      -12-

<PAGE>   13
         Upon the occurrence of an Early Termination Date or Accelerated
         Termination Date, the then applicable Designated Maturity shall be
         equal to the number of days elapsed from such Early Termination Date or
         Accelerated Termination Date to, but excluding the scheduled
         Termination Date; provided that if the Termination Date is extended,
         the Designated Maturity shall be equal to the number of days elapsed
         from the Termination Date to such date to which the Termination Date is
         extended. If such rate does not appear on the Telerate Page 3750, the
         rate for that day will be the rates at which deposits in U.S. Dollars
         are offered to the Reference Banks at approximately 11:00 a.m., London
         time, on the day that is two London Banking Days preceding that day to
         prime banks in the London interbank market for a period of the
         applicable Designated Maturity commencing on such date;

         "Market Disruption Event" means the occurrence or existence on any
         Exchange Business Day of any suspension of or limitation imposed on
         trading (by reason of movement in price exceeding limits permitted by
         the relevant exchange or otherwise) on the Exchange in the Shares, if,
         in the reasonable determination of the Calculation Agent, such
         suspension or limitation prevents such day from being used as a
         Termination Date;

         "Overnight Rate" means the effective rate for Federal Funds, as
         published on Telerate Page 118, provided that if, for any reason,
         Telerate Page 118 should be unavailable the Overnight Rate shall be
         such rate as the Calculation Agent shall reasonably determine;

         "Reference Price" means, with respect to any Valuation Date, the price
         per share on such Valuation Date at which Party A purchases the Shares
         comprising the Reference Share Amount in order to hedge its obligations
         under this Transaction (the "Hedging Price") plus transaction costs of
         $0.03 per Share;

         "Reference Share Amount" means with respect to any Valuation Date, the
         aggregate number of Shares determined by the opening price of the
         Shares (the "Price") for each Valuation Date according to the table
         below, provided that the aggregate Reference Share Amount for all
         Valuation Dates shall not exceed the Number of Shares:

                                      -13-

<PAGE>   14
<TABLE>
<S>                                                            <C>
         If the Price is less than or equal to $42:             400,000 Shares;

         If the Price is greater than $42 but less than         375,000 Shares;
         or equal to $43:

         If the Price is greater than $43 but less than         350,000 Shares;
         or equal to $44:

         If the Price is greater than $44 but less than         300,000 Shares;
         or equal to $45:

         If the Price is greater than $45 but less than         250,000 Shares;
         or equal to $46:

         If the Price is greater than $46 but less than         200,000 Shares;
         or equal to $47:

         If the Price is greater than $47 but less than         150,000 Shares;
         or equal to $48:

         If the Price is greater than $48 but less than         125,000 Shares;
         or equal to $49:

         If the Price is greater than $49 but less than         100,000 Shares;
         or equal to $50:

         If the Price is greater than $50 but less than          75,000 Shares;
         or equal to $51:

         If the Price is greater than $51 but less than          50,000 Shares;
         or equal to $52:

         If the Price is greater than $52 but less than          25,000 Shares;
         or equal to $53:

         If the Price is greater than $53 but less than          15,000 Shares;
         or equal to $54:

         If the Price is greater than $54:                        - 0 - Shares.
</TABLE>

         "Settlement Disruption Event" means an event beyond the control of the
         parties as a result of which transfer of the Shares cannot take place
         through the Clearance System on

                                      -14-

<PAGE>   15
         the first day on which settlement of a sale of Shares executed on the
         relevant day customarily would take place through the Clearance System;

         "Strike Price" means $43.25 per Share for the initial Valuation Date
         and thereafter, the Strike Price then in effect for the immediately
         preceding Business Day multiplied by one plus the Borrowing Rate on the
         immediately preceding Business Day and multiplied by the actual number
         of days elapsed from such preceding Business Day to the current
         Business Day divided by 360;

         "Valuation Date" means, subject to the provisions of Share Liquidity
         Event, each Exchange Business Day commencing on the Trade Date and
         ending on the day which is four Exchange Business Days prior to the
         Termination Date, unless such Exchange Business Day falls during an
         Adjustment Period (as defined under "Distribution Event" below);
         provided that either party may, by notice to the other party through
         the Agent by 9:20 a.m., New York time, on any day that would otherwise
         be a Valuation Date, determine, that such day shall not be a Valuation
         Date.

B.       Adjustment Events
         -----------------

         Adjustments

         Following each Potential Adjustment Event, the parties will negotiate
         in good faith to determine whether such Potential Adjustment Event has
         a diluting or concentrative effect on the market value of the Shares
         and, if so, will negotiate in good faith to: (a) calculate the
         corresponding adjustment, if any, to be made to the Strike Price and
         the Number of Shares or any other term of this Transaction as
         appropriate to account for that diluting or concentrative effect and
         (b) determine the effective date of that adjustment such that the
         fundamental economic terms of this Transaction are substantially
         equivalent to those in effect immediately prior to the occurrence of
         the Potential Adjustment Event. If the parties, after negotiating in
         good faith, are unable to make such determinations, the Calculation
         Agent shall make such determinations on behalf of both parties and the
         determinations of the Calculation Agent shall be binding on the parties
         absent manifest error.

         Potential Adjustment Event

         The declaration by the Issuer of the terms of any of the following:

         (a)      a subdivision, consolidation or reclassification of the Shares
                  (unless a Merger Event), or a free distribution or dividend of
                  Shares to existing holders by way of bonus, capitalization or
                  similar issue;

         (b)      a distribution or dividend to existing holders of the Shares
                  of (i) Shares or (ii) other share capital or securities
                  granting the right to payment of dividends and/or the proceeds
                  of liquidation of the Issuer equally or proportionately with
                  such

                                      -15-

<PAGE>   16
                  payments to holders of the Shares or (iii) any other type of
                  securities, rights or warrants or other assets in any case for
                  payment (cash or other) at less than the prevailing market
                  price, as determined by the Calculation Agent;

         (c)      a call in respect of Shares that are not fully paid; or

         (d)      any other similar event that may have a diluting or
                  concentrating effect on the market value of the Shares.

C.       Distribution Event
         ------------------

         Party B will immediately notify Party A in writing, through the Agent,
         if Party B becomes, or is likely to become, subject to the restrictions
         set forth in Regulation M under the Exchange Act. If at any time during
         the Term of this Transaction,

         (1)      Party B is prohibited from purchasing its Shares under
                  Regulation M under the Exchange Act; or

         (2)      Party B has announced or otherwise made known to holders of
                  Shares a cash tender offer or exchange offer for Shares or
                  another security (a) which is immediately exchangeable for or
                  convertible into Shares or (b) which entitles the holder
                  thereof immediately to acquire Shares; or

         (3)      a person other than Party B makes a tender offer for, or
                  request or invitation for tenders of, any class of equity
                  securities of Party B subject to section 14(d) of the Exchange
                  Act and such person has filed a statement with the SEC
                  pursuant to Rule 14d-1 under the Exchange Act and Party B has
                  received notice thereof;

         then,

                  (i)      in the case of an event specified in subsection (1)
                           above, from the date that Party B is prohibited from
                           purchasing its Shares under Regulation M to the date
                           of completion or other termination of the relevant
                           distribution, and

                  (ii)     in the case of an event specified in subsection (2)
                           above, from the date the event specified in (2)
                           occurs to the date that is ten Business Days after
                           the relevant cash tender offer or exchange offer is
                           completed or otherwise terminated, and

                  (iii)    in the case of an event specified in subsection (3)
                           above, from the date that the event in subsection (3)
                           occurs to the date that Party B has complied with the
                           conditions set forth in Rule 13e-1 under the Exchange
                           Act,

                                      -16-

<PAGE>   17
         the Termination Date shall be rescheduled to a date determined by the
         Calculation Agent. For purposes hereof, the term "Adjustment Period"
         shall mean the period of time specified in subsections (i), (ii) and/or
         (iii), as the case may be.

D.       Share Availability Event
         ------------------------

         If in Party A's good faith judgement, on any Business Day Party A is
         unable to hedge its position in respect of this Transaction through
         share borrowing arrangements because of the lack of sufficient Shares
         being made available by lenders, Party A will give notice thereof,
         through the Agent, to Party B. If on the second Business Day ("X")
         following such notice, Party A in good faith cannot borrow a sufficient
         number of Shares, as determined by Party A, to hedge its position,
         then, notwithstanding the provisions of this Transaction, X shall be
         deemed to be an Accelerated Termination Date with respect only to such
         number of Shares which Party A is unable to borrow.

E.       Share Liquidity Event
         ---------------------

         If in Party A's good faith judgement, it is unable to complete its
         hedging activities or unwind its hedge transactions, then Party A shall
         give written notice thereof, through the Agent, to Party B. Upon
         receipt of such notice by Party B, the parties will, in good faith,
         negotiate an amendment to the Transaction to extend the Termination
         Date. During the term of such negotiations, no Valuation Dates shall be
         deemed to have occurred.

F.       Rule 10b-18
         -----------

         With the co-operation of Party B, Party A undertakes to conduct its
         purchases of the Shares to hedge its exposure under this Transaction in
         accordance with the conditions of subsections 10b-18(b)2 (Time of
         Purchases), 10b-18(b)3 (Price of Purchases) and 10b-18(b)4 (Volume of
         Purchases) of Rule 10b-18 so long as Party B conducts all of its
         purchases of Shares during the Term of this Transaction through Credit
         Suisse First Boston Corporation in compliance with Rule 10b-18 and in a
         manner that the parties hereto believe is in compliance with applicable
         law.

G.       Merger Event
         ------------

         Following each Merger Event:

                  (i)      If the consideration for the Shares in the Merger
                           Event consists (or, at the option of a holder of the
                           Shares, may consist) solely of shares, each Share
                           will be converted to the number of shares to which a
                           holder of a Share would be entitled upon consummation
                           of the Merger Event. Such shares and their issuer
                           shall be deemed the "Shares" and the "Issuer" for
                           purposes of this Transaction and if necessary the
                           Calculation Agent shall adjust the Strike Price
                           proportionately;

                                      -17-

<PAGE>   18
                  (ii)     If the consideration for the Shares in the Merger
                           Event consists solely of cash or any other securities
                           or assets other than shares, a Termination Event
                           shall have deemed to have occurred with this
                           Transaction being the sole Affected Transaction,
                           Party B being the Affected Party and the Early
                           Termination Date being the next succeeding Exchange
                           Business Day; and

                  (iii)    If the consideration for the Shares in the Merger
                           Event consists of both (A) shares and (B) cash or any
                           other securities or assets other than shares, then
                           the consideration will be deemed to be shares and the
                           adjustments described in paragraph (i) above shall be
                           made after reduction of the Strike Price by an amount
                           equal to the sum of the cash and the fair market
                           value (as determined by the Calculation Agent) of any
                           other securities or assets other than shares to which
                           a holder of a Share would have been entitled.

         For purposes of this Confirmation, "Merger Event" means:

                  (i)      Any reclassification or change of the Shares (other
                           than a change in par value, if any, as a result of a
                           subdivision or combination);

                  (ii)     any consolidation, amalgamation or merger of Party B
                           with or into another corporation (other than a
                           consolidation, amalgamation or merger in which Party
                           B is the continuing corporation and which does not
                           result in any such reclassification or change of
                           Shares); or

                  (iii)    any other take-over offer for the Shares

         which results in a transfer of, or a commitment to, transfer all the
         Shares on or before the Termination Date, in each case as of the date
         on which all holders become bound to transfer the Shares held by them.

H.       Blackout Event
         --------------

         If one party gives to the other the notice referred to in the
         definition of Valuation Date, the Termination Date may be extended by
         mutual agreement of the parties to a date equating to the Termination
         Date plus a number of days equal to the number of days which are the
         subject of the notice referred to in the definition of Valuation Date.

I.       Nationalization or Liquidation
         ------------------------------

         A Termination Event shall be deemed to have occurred with this
         Transaction being the sole Affected Transaction, Party B being the
         Affected Party and the Early Termination Date being the next succeeding
         Exchange Business Day if:

                                      -18-

<PAGE>   19
         (i)      by reason of the adoption of or any change in any applicable
                  law, all or substantially all of the assets of Party B or all
                  or substantially all of the Shares are nationalized,
                  expropriated or are otherwise required to be transferred to
                  any governmental agency, authority or entity; or

         (ii)     by reason of the liquidation, winding-up or dissolution of
                  Party B (a) all the Shares are required to be transferred to a
                  trustee, liquidator or other similar official or (b) holders
                  of the Shares become legally prohibited from transferring
                  them.

J.       Party B Representations
         -----------------------

         Party B hereby represents and warrants to Party A that it has entered
         into this Transaction (i) in connection with the Share repurchase
         program publicly announced on March 15, 2000 and (ii) solely for the
         purposes stated in such public disclosures. Party B hereby represents
         and warrants that (unless Party B notifies Party A, through the Agent,
         that such day is not a Valuation Date) it has publicly disclosed all
         material information with respect to its condition (financial or
         otherwise) and, as of the date hereof after giving effect to the
         Transaction and each day until the Termination Date or such other date
         to which the Termination Date may be extended can purchase the
         Reference Share Amount in compliance with applicable law.

K.       Party B Covenants
         -----------------

         From the date hereof to the Termination Date (as such date may be
         adjusted from time to time as provided herein), Party B will effect all
         of its purchase transactions in Shares through Credit Suisse First
         Boston Corporation ("CSFB"). If an event specified in subsection (1) of
         Distribution Event occurs, then Party B will use its reasonable efforts
         to cause such distribution to be completed or otherwise terminated as
         soon as reasonably practicable given the circumstances of the
         Distribution Event, it being understood that it is fully within Party
         B's discretion to undertake transactions pursuant to Regulation M. If
         an event specified in subsection (3) of Distribution Event occurs,
         Party B will, upon the request of Party A use its best efforts to
         comply with the conditions set forth in Rule 13e-1 under the Exchange
         Act no later than thirty (30) after any such request.

L.       Transfer
         --------

         Neither party may Transfer this Transaction, in whole or in part,
         without the prior written consent, communicated through the Agent, of
         the other party.

                                      -19-

<PAGE>   20
                                   APPENDIX B
                                       TO
                          CONFIRMATION OF A TRANSACTION
                                     BETWEEN
                        CREDIT SUISSE FINANCIAL PRODUCTS
                                       AND
                              CARDINAL HEALTH, INC.
                        PARTY A REFERENCE EXT ID# 5748188

         If Party B elects Physical Settlement of this Transaction, the
                       following provisions shall apply:-

(a)      Party B shall have reserved and have available, free from pre-emptive
         rights, out of its authorized but unissued capital stock, for the
         purpose of effecting the payment of any Party B Floating Amount in
         Shares as provided in the Confirmation, the full number of shares of
         capital stock that would then be issuable with respect to such payment.

(b)      There shall be an effective registration statement on the Termination
         Date, Early Termination Date or Accelerated Termination Date with
         respect to such Shares (the "Registration Statement") providing for a
         plan of distribution acceptable to Party A and its underwriters.

(c)      Party B shall have registered or qualified such Shares under such
         securities or "blue sky" laws of such States and other jurisdictions in
         the United States and Puerto Rico as Party A or any underwriter shall
         have reasonably requested, and shall have done any and all other acts
         and things as may be necessary to enable Party A or any underwriter to
         consummate the disposition in such jurisdictions of the Shares covered
         by the Registration Statement.

(d)      Party B shall have caused such Shares to be registered with or approved
         by such other governmental agencies or authorities in the United States
         as may be necessary to enable Party A or any underwriter to consummate
         the disposition of such Shares.

(e)      Party B shall have (i) given Party A and its underwriters, if any, and
         their respective counsel and accountants, the opportunity to
         participate in the preparation of all materials filed with the
         Commission or any other governmental agency (the "Filed Materials")
         prior to the date Party B elects to pay the Party B Floating Amount in
         Shares, (ii) furnished to each of them copies of all such Filed
         Materials (and all documents incorporated therein by reference)
         sufficiently in advance of filing to provide them with a reasonable
         opportunity to review such documents and comment thereon, (iii) given
         each of them such access to its books and records and such
         opportunities to discuss the business of Party B with its officers and
         the independent public accountants who have issued a report on its
         financial statement as shall be necessary, in the opinion of Party A
         and such underwriters or their respective counsel, to conduct a
         reasonable investigation (within the meaning of the Securities Act of
         1933, as amended, (the "Securities Act"))

                                      -20-

<PAGE>   21
         with respect to such Filed Materials, (iv) delivered to Party A and its
         underwriters, if any, any financial statements of Party B filed with
         the Commission, (v) included in such Filed Materials material,
         furnished to Party B in writing, which in the judgement of Party A or
         its underwriters, if any, subject to the consent of Party B (which
         shall not be unreasonably withheld), should be included, including,
         without limitation, language to the effect that the holding by Party A
         of the Shares is not to be construed as a recommendation by Party A of
         the investment quality thereof and (vi) if requested by Party A,
         deleted from such Filed Materials any reference to Party A if such
         reference to Party A by name or otherwise is not required by the
         Securities Act or any similar Federal statute then in force.

(f)      Party B shall have furnished to Party A and any underwriter, addressed
         to Party A and any such underwriter and dated the day payment in Shares
         is made, (i) an opinion of counsel for Party B (which may be internal
         counsel to Party B) and (ii) a "cold comfort" letter signed by the
         independent public accountants who have issued a report on Party B's
         financial statements included in such Registration Statement, covering
         substantially the same matters with respect to such Shares and the
         offering, sale and issuance thereof as are customarily covered in
         opinions of issuer's counsel and in accountants' letters delivered to
         underwriters in underwritten public offerings of securities and, in the
         case of the accountants' letter, such other financial matters as Party
         A may have reasonably requested.

(g)      Party B shall have complied with all applicable provisions of the
         Securities Act and the Exchange Act, all applicable rules of the
         Commission and all other applicable laws, rules and regulations of any
         governmental or regulatory authority with respect to such Filing
         Materials and such Shares and the offering, sale and issuance thereof;
         in connection thereto Party A shall assist in the preparation of a
         seller shareholder registration statement and, if requested by Party B,
         supply Party B with such representations regarding Party A's due
         diligence and financial ability to bear the economic risk of its
         investment in the Shares as are customary for a purchaser in a private
         placement of securities.

(h)      Party B shall have caused all such Shares to be listed on the Exchange
         and on each securities exchange on which similar securities issued by
         Party B are then listed.

(i)      Party B shall have provided a transfer agent and registrar for such
         Shares.

(j)      Party B shall have taken such other actions as Party A or any
         underwriter of such Shares shall have reasonably requested in order to
         expedite or facilitate the disposition of such Shares.

(k)      Party B shall provide Party A and its underwriters, if any, with a
         usual and customary indemnity and contribution in the opinion of
         counsel to Party A covering such matters relating to the Shares, the
         Filed Materials, and such other matters as counsel to Party A shall
         deem to be necessary or required.

                                      -21-

<PAGE>   22
(l)      Party B shall have paid all costs and expenses incurred in connection
         with the preparation and filing of any document with the Commission,
         the preparation and delivery of the legal opinion referred to in
         paragraph (f) hereof and any other ancillary documents relating to the
         sale of the Shares by or on behalf of Party A and all underwriting fees
         and/or applicable commissions in connection with the sale of the shares
         by or on behalf of Party A.

(m)      Party B shall deliver all such Shares through the Clearance System.

                                      -22-

<PAGE>   23
                                   APPENDIX C
                                       TO
                          CONFIRMATION OF A TRANSACTION
                                     BETWEEN
                        CREDIT SUISSE FINANCIAL PRODUCTS
                                       AND
                              CARDINAL HEALTH INC.
                        PARTY A REFERENCE EXT ID# 5748188

Net Share Settlement:

(a)      Net Share Settlement Amount:

         If Party B has elected that Net Share Settlement shall apply and if the
         Net Floating Amount (as such term is defined below) owing by one party
         (the "Delivering Party") to the other party (the "Receiving Party")
         under this Transaction is greater than zero then such obligation shall
         be satisfied and discharged by:

         (i)      the delivery of an amount of Shares to be determined as set
                  forth below (hereinafter referred to as the "Net Share
                  Settlement Amount"); plus

         (ii)     an amount in U.S. Dollars equal to the Balancing Payment (as
                  such term is defined below), if any, plus

         (iii)    an amount in U.S. Dollars equal to the Carry Charges (as such
                  term is defined below), if any,

         provided that if Party B is the Delivering Party then such Shares
         delivered by Party B shall meet the conditions specified in Appendix B
         hereto and further provided that Party A is at that time permitted to
         purchase and sell Shares and that Party B is at that time permitted to
         deliver and take delivery of Shares, both in accordance with applicable
         law in the determination of counsel to the party affected.

         The Net Share Settlement Amount and the identity of the Delivering
         Party and the Receiving Party shall be determined by the Calculation
         Agent acting in good faith and in a commercially reasonable manner as
         set out below.

         The Calculation Agent shall determine the difference in U.S. Dollars
         between the Party A Floating Amount and the Party B Floating Amount
         (the "Net Floating Amount"); if the Party A Floating Amount is greater
         than the Party B Floating Amount, Party A shall be the Delivering Party
         and if the Party B Floating Amount is greater than the Party A Floating
         Amount, Party B shall be the Delivering Party.

                                      -23-

<PAGE>   24
         The Calculation Agent shall provide written confirmation of its
         calculations and determinations to the parties hereto in reasonable
         detail not later than the close of business on the Termination Date.
         The failure of the Calculation Agent to provide such written
         confirmation shall not vitiate any such calculations or determinations
         nor shall it absolve the parties hereto from compliance with their
         respective obligations under this Transaction.

         The Net Share Settlement Amount shall be the number of Shares, rounded
         down to the nearest whole Share, that represents the quotient of the
         Net Floating Amount divided by the Hedging Price of the Shares on the
         Exchange on the final Valuation Date.

         If Party A is the Delivering Party, subject to any requirements of
         applicable law, on each Exchange Business Day following the final
         Valuation Date (each such date being a "Purchase Date") Party A shall
         purchase as many Shares through the Exchange as it deems appropriate in
         its sole commercial discretion until it has bought a number of Shares
         equal to the Net Share Settlement Amount. The provisions of paragraph F
         in Appendix A shall apply with respect to such purchases by Party A.
         Subject to the occurrence of a Settlement Disruption Event, Party A
         shall, subject to any requirements of applicable law, deliver such
         number of Shares to Party B on the third Exchange Business Day
         following each Purchase Date (each such date of delivery being a "Party
         A Settlement Date") and the provisions below shall apply with respect
         to each such delivery of Shares.

         If Party B is the Delivering Party then, on the Payment Date, Party B
         shall, subject to any requirements of applicable law, deliver the
         number of Shares equal to the Net Share Settlement Amount which Shares
         shall satisfy the conditions of Appendix B hereto. Party A shall use
         its best efforts to sell the Shares comprising the Net Share Settlement
         Amount (the date of each such sale being a "Resale Date" and the third
         Exchange Business Day after each such Resale Date being a "Party B
         Settlement Date").

         In the event of the occurrence of a Settlement Disruption Event or in
         the event that the parties cannot deliver and take delivery of Shares,
         both in accordance with applicable law in the determination of counsel
         to the party affected, each Purchase Date, Resale Date, or Party A
         Settlement Date or Party B Settlement Date, as the case may be, shall
         be postponed until the first Exchange Business Day on which a
         Settlement Disruption Event has not occurred and on which the parties
         may deliver and take delivery of Shares in accordance with applicable
         law in the determination of counsel to the party affected.

         On each Purchase Date or each Resale Date, as the case may be, the
         Calculation Agent shall determine the Balancing Payment and the Carry
         Charges (as each of such terms are defined below) and the identity of
         the party to pay and receive such Balancing Payment and Carry Charges.
         On the final Party A Settlement Date or on the final Party B Settlement
         Date, as the case may be, the net amount of all of the Balancing
         Payments and Carry Charges shall be discharged by a single payment in
         U.S. Dollars by the party so identified by the Calculation Agent to the
         other party, through the Agent.

                                      -24-

<PAGE>   25
         If for any reason (including, for example only and without limiting the
         foregoing, the occurrence of a Market Disruption Event (as such term is
         defined below) or the existence of a deficiency in the registration
         status of the Shares, illiquid market conditions or the conditions
         customarily contained in underwriting agreements between issuers and
         underwriters that are commonly known as "market-outs"), Party A cannot
         sell all of the shares comprising the Net Share Settlement Amount
         within a reasonable period of time following the Termination Date (as
         determined by Party A in its discretion), Party A shall have no further
         obligation to resell such unsold portion of the Net Share Settlement
         Amount and shall promptly redeliver all of the unsold Shares to Party B
         against the payment by Party B to Party A of an amount in U.S. Dollars
         equal to the excess of the Net Share Settlement Amount over the Net
         Proceeds (as defined below), if any, attributable to shares sold by
         Party A. "Net Proceeds" means the proceeds of the sales on each Resale
         Date, net of any fees, commissions and expenses incurred in connection
         with the offer and sale of the Shares (including, but without
         limitation to, the covering of any over-allotment or short position
         (syndicate or otherwise)).

         In no event will any Shares delivered by Party B to Party A in
         connection with this Transaction be delivered by Party A to cover any
         Party A short position in Shares.

(b)      Balancing Payments:

         For the purposes of this Transaction and with respect to each Purchase
         Date or Resale Date, as the case may be, the "Balancing Payment" means
         an amount in U.S. Dollars determined by the Calculation Agent to be the
         product of: (i) the number of Shares purchased or sold by Party A, as
         the Delivering Party or the Receiving Party, on that date; multiplied
         by (ii) the absolute value of the difference between the Hedging Price
         of the Shares on the final Valuation Date (the "Termination Reference
         Price") and the average weighted price at which Party A has purchased
         or sold the Shares on the Purchase Date or the Resale Date, as the case
         may be, (each being a "Balancing Reference Price"). With respect to
         each Balancing Payment, the Delivering Party shall owe that Balancing
         Payment to the Receiving Party if the Termination Reference Price is
         greater than that Balancing Reference Price and the Receiving Party
         shall owe that Balancing Payment to the Delivering Party if that
         Balancing Reference Price is greater than the Termination Reference
         Price.

                                      -25-

<PAGE>   26
(c)      Carry Charges:

         For the purposes of this Transaction, the "Carry Charge" means an
         amount determined by subtracting (y) below from (x) below. The
         Delivering Party shall owe the Carry Charge to the Receiving Party if
         the amount is positive or the Receiving Party shall owe the absolute
         value of the Carry Charge to the Delivering Party if the amount is
         negative:

         (x)      the sum of the U.S. Dollar amounts in interest calculated at
                  the Overnight Rate with respect to a notional amount equal to
                  the Net Floating Amount (or each applicable portion thereof in
                  the case of multiple Settlement Dates) for the actual number
                  of days elapsed from and including the Payment Date to but
                  excluding each Party A Settlement Date or Party B Settlement
                  Date, as the case may be, divided by 360; and

         (y)      the aggregate amount of dividends, if any, actually received
                  by the Receiving Party on any shares included in the Net Share
                  Settlement Amount during the period(s) specified in (x) above.

         Notwithstanding the foregoing, in the event that Party A notifies Party
         B that the transfer of Shares by Party B to Party A contemplated by
         this Transaction results in Party A and its Affiliates then holding, in
         the aggregate, a number of Shares equal to or greater than 5% of the
         then issued and outstanding Shares of Party B (the "Trigger Amount")
         such transfer of Shares shall be effected in tranches such that at no
         time shall Party A and its Affiliates hold, in the aggregate, a number
         of Shares in an amount greater than or equal to the Trigger Amount.

                                      -26-
<PAGE>   27
                            FIRST AMENDMENT AGREEMENT

This First Amendment Agreement (hereinafter referred to as the "Amendment
Agreement"), dated as of May 19, 2000 is made between Credit Suisse First Boston
International (formerly known as Credit Suisse Financial Products) ("Party A")
and Cardinal Health, Inc. ("Party B") through Credit Suisse First Boston
Corporation (the "Agent") and supplements the 1992 ISDA Master Agreement between
Party A and Party B.

WHEREAS Party A and Party B entered into a Transaction with a Party A Reference
No. 5748188, a Trade Date of 16 March 2000, a Number of Shares of 7,000,000, and
a Termination Date of 30 June 2000, evidenced by a Confirmation dated 16 March
2000 (the "Confirmation"); and

WHEREAS, subject to the terms and provisions hereof, Party A and Party B wish to
amend the definitions of "Termination Date" and "Reference Share Amount" as set
forth below,

NOW, THEREFORE, in consideration of the mutual premises herein, Party A and
Party B agree as follows:

1.       Effective as of the Trade Date, (the "Amendment Effective Date") the
         definition of the "Termination Date" shall be amended so that the
         reference in the Confirmation to June 30, 2000 shall be read as a
         reference to September 30, 2000.

2.       Effective as of the Amendment Effective Date the definition of the
         "Reference Share Amount shall be deleted in its entirety and the
         following shall be inserted in lieu thereof:

                  "Reference Share Amount" means with respect to any Valuation
                  Date, the lesser of: (a) the aggregate number of Shares
                  determined by the lowest price of the Shares reported on the
                  Exchange during each Valuation Date (the "Price"), according
                  to the table below; and (b) the actual number of Shares
                  purchased by Party A to hedge its obligations under this
                  Transaction on such Valuation Date, PROVIDED THAT the
                  aggregate Reference Share Amount for all Valuation Dates shall
                  not exceed the Number of Shares:

<TABLE>
<S>                                                                                 <C>
                  If the Price is less than or equal to $42:                        400,000 Shares;

                  If the Price is greater than $42 but less than or                 375,000 Shares;
                  equal to $43:

                  If the Price is greater than $43 but less than or                 350,000 Shares;
                  equal to $44:
</TABLE>

                                       1
<PAGE>   28

<TABLE>
<S>                                                                                 <C>
                  If the Price is greater than $44 but less than or                 300,000 Shares;
                  equal to $45:

                  If the Price is greater than $45 but less than or                 250,000 Shares;
                  equal to $46:

                  If the Price is greater than $46 but less than or                 200,000 Shares;
                  equal to $47:

                  If the Price is greater than $47 but less than or                 150,000 Shares;
                  equal to $48:

                  If the Price is greater than $48 but less than or                 125,000 Shares;
                  equal to $49:

                  If the Price is greater than $49 but less than or                 100,000 Shares;
                  equal to $50:

                  If the Price is greater than $50 but less than or                  75,000 Shares;
                  equal to $51:

                  If the Price is greater than $51 but less than or                  50,000 Shares;
                  equal to $52:

                  If the Price is greater than $52 but less than or                  25,000 Shares;
                  equal to $53:

                  If the Price is greater than $53 but less than or                  15,000 Shares;
                  equal to $54:

                  If the Price is greater than $54:                                   - 0 - Shares.
</TABLE>

3.       As of the Amendment Effective Date all rights, duties, claims and
         obligations of Party A and Party B with respect to the Transaction
         shall be amended with effect from and including the Trade Date such
         that all references therein to the definitions of "Termination Date"
         and "Reference Share Amount" shall be read and construed as references
         to such definitions of "Termination Date" and "Reference Share Amount"
         as amended herein.

4.       Except so far as amended by Clauses 1 and 2 hereof, and save to the
         extent it is inconsistent herewith, the Transaction shall remain in
         full force and effect save that every reference therein to
         "Transaction" and the definitions of "Termination Date" and "Reference
         Share Amount" shall be construed as a reference to such Transaction and
         definitions of "Termination Date" and "Reference Share Amount" as
         expressly amended hereby.

                                       2
<PAGE>   29

5.       Unless otherwise defined herein, capitalized terms used in this
         Amendment Agreement shall have the meanings ascribed to those terms in
         the Confirmation.

6.       This Amendment Agreement may be executed by any number of counterparts,
         each of which shall be deemed to be an original and all of which shall
         be deemed to be one and the same instrument.

7.       This Amendment Agreement shall be governed by, and construed in
         accordance with, the laws of the State of New York, without reference
         to choice of law doctrine and each party hereby submits to the
         jurisdiction of the Courts of the State of New York.

8.       Party A and Party B each represents to the other that it has entered
         into this Amendment Agreement in reliance upon such tax, accounting,
         regulatory, legal, and financial advice as it deems necessary and not
         upon any view expressed by the other.

Credit Suisse First Boston International is regulated by The Securities and
Futures Authority and has entered into this amended transaction as principal.
The time at which the above amended transaction was executed will be notified to
Party B (through the Agent) on request.

                                       3
<PAGE>   30

IN WITNESS WHEREOF, each of the parties hereto has caused this Amendment
Agreement to be executed by their officers thereto duly authorized and empowered
with effect from the date first written above.

CREDIT SUISSE FIRST BOSTON CORPORATION
solely in its capacity as AGENT for
PARTY A and PARTY B

By:    /s/ Edward J. McMahon
       ---------------------------------
Name:  Edward J. McMahon
Title: Assistant Vice President

CARDINAL HEALTH, INC.

By:    /s/ Richard J. Miller
       --------------------------------
Name:  Richard J. Miller
Title: Executive Vice President and CFO

CREDIT SUISSE FIRST BOSTON INTERNATIONAL

By:    /s/ Edmond Curtin
       --------------------------------
Name:  Edmond Curtin
Title: Director - Legal and Compliance Department

By:    /s/ Kevin Studd
       --------------------------------
Name:  Kevin Studd
Title: Managing Director

                                       4
<PAGE>   31
                           SECOND AMENDMENT AGREEMENT

This Second Amendment Agreement (hereinafter referred to as the "Amendment
Agreement"), dated as of May 19, 2000 is made between Credit Suisse First Boston
International (formerly known as Credit Suisse Financial Products) ("Party A")
and Cardinal Health, Inc. ("Party B") through Credit Suisse First Boston
Corporation (the "Agent") and supplements the 1992 ISDA Master Agreement between
Party A and Party B.

WHEREAS Party A and Party B entered into a Transaction with a Party A Reference
No. 5748188, a Trade Date of 16 March 2000, a Number of Shares of 7,000,000, and
a Termination Date of 30 September 2000, evidenced by a Confirmation dated 16
March 2000 as amended on May 18, 2000 (the "Confirmation"); and

WHEREAS, subject to the terms and provisions hereof, Party A and Party B wish to
amend the definition of "Reference Share Amount" as set forth below,

NOW, THEREFORE, in consideration of the mutual premises herein, Party A and
Party B agree as follows:

1.       Effective as of May 19, 2000 (the "Amendment Effective Date") the
         definition of the "Reference Share Amount" shall be deleted in its
         entirety and the following shall be inserted in lieu thereof:

                  "Reference Share Amount" means with respect to any Valuation
                  Date, the lesser of: (a) the aggregate number of Shares
                  determined by the lowest price of the Shares reported on the
                  Exchange during each Valuation Date (the "Price"), according
                  to the table below; and (b) the actual number of Shares
                  purchased by Party A to hedge its obligations under this
                  Transaction on such Valuation Date, PROVIDED THAT the
                  aggregate Reference Share Amount for all Valuation Dates shall
                  not exceed the Number of Shares:

<TABLE>
<S>                                                                                 <C>
                  If the Price is less than or equal to $63:                        200,000 Shares;

                  If the Price is greater than $63 but less than or                 175,000 Shares;
                  equal to $64:

                  If the Price is greater than $64 but less than or                 125,000 Shares;
                  equal to $65:

                  If the Price is greater than $65but less than or equal             75,000 Shares;
                  to $66:

                  If the Price is greater than $66 but less than or                   25,000 Shares
                  equal to $67:
</TABLE>

                                       1
<PAGE>   32

<TABLE>
<S>                                                                                   <C>
                  If the Price is greater than $67 but less than or equal to          15,000 Shares
                  $68:

                  If the Price is greater than $68:                                   - 0 - Shares.
</TABLE>

2.       As of the Amendment Effective Date all rights, duties, claims and
         obligations of Party A and Party B with respect to the Transaction
         shall be amended with effect from and including the Amendment Effective
         Date such that all references therein to the definition of "Reference
         Share Amount" shall be read and construed as references to such
         definition as amended herein.

3.       Except so far as amended by Clause 1 hereof, and save to the extent it
         is inconsistent herewith, the Transaction shall remain in full force
         and effect save that every reference therein to "Transaction" and the
         definition of " "Reference Share Amount" shall be construed as a
         reference to such Transaction and definition of "Reference Share
         Amount" as expressly amended hereby.

4.       Unless otherwise defined herein, capitalized terms used in this
         Amendment Agreement shall have the meanings ascribed to those terms in
         the Confirmation.

5.       This Amendment Agreement may be executed by any number of counterparts,
         each of which shall be deemed to be an original and all of which shall
         be deemed to be one and the same instrument.

6.       This Amendment Agreement shall be governed by, and construed in
         accordance with, the laws of the State of New York, without reference
         to choice of law doctrine and each party hereby submits to the
         jurisdiction of the Courts of the State of New York.

7.       Party A and Party B each represents to the other that it has entered
         into this Amendment Agreement in reliance upon such tax, accounting,
         regulatory, legal, and financial advice as it deems necessary and not
         upon any view expressed by the other.

Credit Suisse First Boston International is regulated by The Securities and
Futures Authority and has entered into this amended transaction as principal.
The time at which the above amended transaction was executed will be notified to
Party B (through the Agent) on request.

                                       2
<PAGE>   33

IN WITNESS WHEREOF, each of the parties hereto has caused this Amendment
Agreement to be executed by their officers thereto duly authorized and empowered
with effect from the date first written above.

CREDIT SUISSE FIRST BOSTON CORPORATION
solely in its capacity as AGENT for
PARTY A and PARTY B

By:    /s/ Edward J. McMahon
       ---------------------------------
Name:  Edward J. McMahon
Title: Assistant Vice President

CARDINAL HEALTH, INC.

By:    /s/ Richard J. Miller
       --------------------------------
Name:  Richard J. Miller
Title: EVP & CFO

CREDIT SUISSE FIRST BOSTON INTERNATIONAL

By:    /s/ Edmond Curtin
       --------------------------------
Name:  Edmond Curtin
Title: Director - Legal and Compliance Department

By:    /s/ Kevin Studd
       --------------------------------
Name:  Kevin Studd
Title: Managing Director

                                       3

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