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                                                                    EXHIBIT 4(b)

                               AMENDMENT NO. 1 TO
                              CARDINAL HEALTH, INC.
                      INCENTIVE DEFERRED COMPENSATION PLAN
                (as amended and restated effective July 1, 1997)


         Effective as of November 3, 1999, the Cardinal Health, Inc. Incentive
Deferred Compensation Plan, as amended and restated effective July 1, 1997, (the
"Original Plan"), is hereby amended by this Amendment No. 1 as follows:

1. Article II is hereby deleted and replaced in its entirety by the following:

                            All persons  subject to Section 16 of the Securities
         Exchange Act of 1934, as amended (each a "Reporting Person"), except
         for those Reporting Persons who are not participating in this Plan as
         of the date of this Amendment No. 1 and who are parties to an
         employment agreement that does not specifically provide for
         participation in this Plan, shall automatically be eligible to
         participate in the Plan. In addition, the Chairman of Cardinal Health,
         Inc. may select, within his sole discretion, other employees eligible
         to participate in the Plan. Only high income or key management
         employees are eligible for selection by the Chairman. If you are an
         eligible Reporting Person or you are chosen by the Chairman to
         participate in the Plan, you will sign an Incentive Deferred
         Compensation Agreement which details the requirements you must satisfy
         to be eligible to receive this supplemental retirement benefit from the
         Company. The Chairman will review and determine his selections each
         year. Thus, selection in one year does not automatically confer a right
         to participant in succeeding years, provided, however, that all
         Reporting Persons described above shall at all times during which they
         are a Reporting Person be eligible to participate in the Plan. If you
         were a participant one year but are not eligible in a succeeding year,
         you will still be a participant, but will be treated as "inactive."

2. The first paragraph under Article III is hereby deleted and replaced in its
   entirety by the following:

                            The Plan is considered to be an "unfunded"
         arrangement as amounts generally will not be set aside or held by the
         Company in a trust, escrow, or similar account or fiduciary
         relationship on your behalf. Each participant's rights to benefits
         under the Plan are equivalent to the rights of any unsecured general
         creditor of the Company. However, the Company may open accounts with
         one or more investment companies selected by the Chairman, in his
         discretion, and may invest funds subject to this Plan in those
         investment companies. The Company also may establish a deferred
         compensation trust (rabbi or otherwise) in connection with the Plan.
         Each participant may be permitted to direct how the portion of the
         Company's funds allocable to him or her is invested from among the
         available alternatives, if such investment accounts are established.
         The Company currently expects any such alternatives to be similar to
         those available under the Qualified Plan, but is not obligated to make
         these or any other particular investment options available. If a
         participant is permitted to direct how the portion of the Company's
         funds allocable to him or her is invested among the available
         alternatives, the participant may be permitted to change such direction
         from time to time; provided, however, that in no event shall a
         participant be permitted to change any investment in a Cardinal Stock
         Account (defined below) to any other investment alternative, except as
         to future funds allocable to him or her as provided below under the
         heading "Election to Defer into Common Shares". All investments shall
         at all times continue to be a part of the Company's general assets.

3. The paragraph describing "Deferral Value" in Article III is hereby deleted in
   its entirety and replaced by the following:

                            Second, to encourage each participant to invest in
         his or her own future, you may also elect to defer your compensation
         from the Company. You may elect (within 30 days of when you first
         become eligible to participate in the Plan for your initial year of
         participation or, for subsequent years, not later than the December 31
         prior to each such year) to defer payment of a portion of your
         compensation


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         to be earned during the balance of the current or next calendar year,
         as applicable, as a credit to your Accumulations. Except as set forth
         below, the minimum amount you may defer is 1% and the maximum is 20% of
         your compensation. Under special circumstances, the Chairman may also
         determine, in his discretion, that any participant who is not a
         Reporting Person may be periodically eligible to make a special
         election after the beginning of the year to defer any compensation for
         the remainder of the year which is not yet payable to such participant.
         Notwithstanding the foregoing, the Chairman may defer up to a maximum
         of 100% of his compensation into the Plan. These voluntary deferrals by
         all participants, adjusted for earnings or losses as described below,
         are known as the "Deferral Value." The Company may, in its discretion,
         establish and change from time to time a maximum limitation on deferral
         contributions for participants who are not Reporting Persons.

4. Three new paragraphs are hereby added to the end of Article III which provide
   as follows:

                            ELECTION  TO DEFER  INTO  COMMON  SHARES:  Subject
         to the provisions of this Article III, whenever you make a deferral
         election pursuant to the terms of this Plan, you may also elect to have
         all or a portion of the Accumulations to be deemed invested in common
         shares, without par value ("Common Shares"), of the Company (such
         deferred Accumulations, the "Share Election Accumulations"). On the
         date when your Share Election Accumulations would otherwise be payable
         to you (if you had not elected to defer such payment) (the "Payment
         Date"), the Company will credit to a separate account (your "Cardinal
         Stock Account") a number of hypothetical Common Shares (and fractions
         thereof) having a Value equal to the Share Election Accumulations. For
         purposes of this Plan, the "Value" of a Common Share on a particular
         day shall mean the closing trading price of a Common Share on the New
         York Stock Exchange on that day (or, if there is no trading of the
         Common Shares on that day, on the most recent previous date on which
         trading occurred). Any election made pursuant to this paragraph shall
         be irrevocable for all Accumulations earned during the calendar year
         for which the election is made. Any election made pursuant to this
         paragraph shall remain in effect for Accumulations earned in subsequent
         calendar years unless you deliver a written notice to the Secretary of
         the Company setting forth a different deferral election, which shall be
         applied to future calendar years until further written notice is
         received by the Secretary of the Company pursuant to this section.
         Notwithstanding the foregoing, if any deferral election into Common
         Shares would make a transaction between the Company and any other
         entity ineligible for pooling-of-interests accounting under APB No. 16
         that but for the nature of such deferral would otherwise be eligible
         for such accounting treatment, such deferral election shall be treated
         as a deferral election into the other available funds pro-rata.

                            If any recapitalization,  reorganization,
         reclassification, consolidation, merger of Cardinal Health, Inc.
         ("Cardinal") or the Company or any sale of all or substantially all of
         Cardinal's or the Company's assets to another person or entity or other
         transaction which is effected in such a way that holders of Common
         Shares are entitled to receive (either directly or upon subsequent
         liquidation) stock, securities, or assets with respect to or in
         exchange for Common Shares (each an "Organic Change") shall occur, then
         your Cardinal Stock Account (if any) shall be adjusted so as to contain
         such shares of stock, securities or assets (including cash) as would
         have been issued or payable with respect to or in exchange for the
         number of Common Shares credited thereto immediately before such
         Organic Change, if such Common Shares had been outstanding. If the
         assets held in your Cardinal Stock Account immediately after such
         adjustment are not equity securities, then you shall be permitted to
         re-direct the investment thereof into the other investment choices then
         available under this Plan.

                            In the case of your  Cardinal  Stock  Account (if
         any), the earnings (or losses) credited to such account shall consist
         solely of dividend equivalent credits pursuant to this paragraph.
         Whenever a dividend or other distribution is made with respect to the
         Common Shares, then your Cardinal Stock Account shall be credited, on
         the payment date for such dividend or other distribution (the "Dividend
         Payment Date"), with a number of additional Common Shares having a
         Value, as of the Dividend Payment Date, based upon the number of Common
         Shares deemed to be held in your Cardinal Stock Account as of the
         record date for such dividend or other distribution (the "Dividend
         Record Date"), if such Common Shares were outstanding. If such dividend
         or other distribution is in the form of cash, the number of Common
         Shares so credited shall be a number of Common Shares (and fractions
         thereof) having a Value,


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         as of the Dividend Payment Date, equal to the amount of cash that would
         have been distributed with respect to the Common Shares deemed to be
         held in your Cardinal Stock Account as of the Dividend Record Date, if
         such Common Shares were outstanding. If such dividend or other
         distribution is in the form of Common Shares, the number of Common
         Shares so credited shall equal the number of such Common Shares (and
         fractions thereof) that would have been distributed with respect to the
         Common Shares deemed to be held in your Cardinal Stock Account as of
         the Dividend Record Date, if such Common Shares were outstanding. If
         such dividend or other distribution is in the form of property other
         than cash or Common Shares, the number of Common Shares so credited
         shall be a number of Common Shares (and fractions thereof) having a
         Value, as of the Dividend Payment Date, equal to the value of the
         property that would have been distributed with respect to the Common
         Shares deemed to be held in your Cardinal Stock Account as of the
         Dividend Record Date, if such Common Shares were outstanding. The value
         of such property shall be its fair market value as of the Dividend
         Payment Date, determined by the Cardinal Board of Directors (the
         "Board") based upon market trading if available and otherwise based
         upon such factors as the Board deems appropriate.

5. A new sentence is hereby added to the end of Article IV, subparagraph C.5
   which provides as follows:

         Payments of amounts credited to your Cardinal Stock Account, if any,
         shall be in the form of Common Shares plus cash in lieu of any
         fractional shares.

6. A new paragraph E is hereby added to Article V entitled "General
   Restrictions" which provides as follows:

         E.  GENERAL RESTRICTIONS

                            Notwithstanding  any other  provision  of this  Plan
         or any Directors Deferred Compensation Agreement, the Company shall not
         be required to issue or deliver any certificate or certificates for
         Common Shares under this Plan prior to fulfillment of all of the
         following conditions:

         (i) Listing or approval for listing upon official notice of issuance of
         such shares on the New York Stock Exchange, Inc., or such other
         securities exchange as may at the time be a market for the Common
         Shares;

         (ii) Any registration or other qualification of such shares under any
         state or federal law or regulation, or the maintaining in effect of any
         such registration or other qualification which the Chairman shall, in
         his absolute discretion upon the advice of counsel, deem necessary or
         advisable; and

         (iii) Obtaining any other consent, approval, or permit from any state
         or federal governmental agency which the Chairman shall, in his
         absolute discretion after receiving the advise of counsel, determine to
         be necessary or advisable.

         Nothing contained in this Plan shall prevent the Company from adopting
         other or additional compensation arrangements for the participants.

7. A new paragraph F is hereby added to Article V entitled "Common Shares
   Available" which provides as follows:


         F.  COMMON SHARES AVAILABLE

                            The maximum aggregate number of Common Shares which
         may be credited to Cardinal Stock Accounts pursuant to this Plan is
         1,500,000. Common Shares issuable under the Plan may be taken from
         authorized but unissued shares, treasury shares, shares held in a trust
         for purposes of the Plan, or purchased on the open market. No single
         participant may acquire under the Plan more than 750,000 Common Shares.

                            In the event of any stock dividend, stock split,
         share combination, corporate separation or division (including, but not
         limited to, split-up, spin-off, split-off or distribution to Cardinal's


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         shareholders other than a normal cash dividend), or partial or complete
         liquidation, or any other corporate transaction or event having any
         effect similar to any of the foregoing, then the aggregate number of
         Common Shares reserved for issuance under the Plan shall be
         appropriately substituted for new shares or adjusted, as determined by
         Cardinal's Compensation and Personnel Subcommittee in its sole
         discretion.

8. Except to the extent otherwise set forth herein, the terms, conditions and
provisions of the Original Plan are unchanged and remain in full force and
effect.


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