Document:

<PAGE>   1

                                                                   EXHIBIT 4.4

<TABLE>
<S>                               <C>                                                                             <C>

[NUMBER]                                                 CAREMARK RX, INC.                                        [SHARES]
                                        INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                                                                                                   SEE REVERSE FOR
                                                                                                                 CERTAIN DEFINITIONS

                                                                                                                   CUSIP 141705 10 3

THIS IS TO CERTIFY THAT

IS THE OWNER OF

                           FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF CAREMARK, RX, INC.
transferable on the books of the Corporation in person or by duly authorized attorney upon surrender of this Certificate properly
endorsed. This Certificate and the shares represented hereby are issued and shall be held subject to all of the provisions of the
Certificate of Incorporation of the Corporation, as amended and restated, and its Bylaws, as amended and restated, copies of which
are on file with the Transfer Agent, to all provisions of which the holder of this Certificate, by acceptance hereof assents. This
Certificate is not valid until countersigned and registered by the Transfer Agent and Registrar.

            Witness the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

Dated:

COUNTERSIGNED AND REGISTERED

FIRST CHICAGO TRUST COMPANY OF NEW YORK                                  /s/  Sara J. Finley

By                                                                              SECRETARY

                         TRANSFER AGENT
                         AND REGISTRAR,

/s/                   AUTHORIZED SIGNATURE.

                                                                        /s/  E. Mac Crawford

                                                                                                    CHAIRMAN OF THE BOARD, PRESIDENT
                                                                                                         AND CHIEF EXECUTIVE OFFICER
</TABLE>

<PAGE>   2
                               CAREMARK RX, INC.

         This certificate also evidences and entitles the holder hereof to
certain Rights as set forth in the Rights Agreement between MedPartners, Inc.
and Chemical Bank dated as of March 1, 1995, as amended and assumed by
MedPartners/Mullikin, Inc. formerly known as MedPartners, Inc. and now known as
Caremark Rx, Inc. (the "Company"), on November 28, 1995, and as assumed by First
Chicago Trust Company of New York (the "Rights Agent") as of September 5, 1996
(the "Rights Agreement"), the terms of which are hereby incorporated herein by
reference and a copy of which is on file at the principal offices of the
Company. Under certain circumstances, as set forth in the Rights Agreement, such
Rights will be evidenced by separate certificates and will no longer be
evidenced by this certificate. The Company will mail to the holder of this
certificate a copy of the Rights Agreement, as in effect on the date of mailing,
without charge promptly after receipt of a written request therefor. Under
certain circumstances set forth in the Rights Agreement, Rights issued to, or
held by, any Person who is, was or becomes an Acquiring Person or any Affiliate
or Associate thereof (as such terms are defined in the Rights Agreement),
whether currently held by or on behalf of such Person or by any subsequent
holder, may become null and void.

         Caremark Rx, Inc. will furnish to any stockholder, upon request and
without charge, a full statement of the powers, designations, preferences, and
relative, participating, optional, or other special rights of each class of
stock or series thereof and the qualifications, limitations or restrictions of
such preferences and/or rights and the authority of the Board of Directors to
fix and determine the relative rights and preferences of series of preferred
and preference stock.

        The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<TABLE>
        <S>                                             <C>
        TEN COM -- as tenants in common                 UNIF GIFT MIN ACT -- _____________ Custodian ___________
        TEN ENT -- as tenants by the entireties                                 (Cust)                  (Minor)
        JT TEN  -- as joint tenants with right of                            under Uniform Gifts to Minors
                   survivorship and not as tenants                           Act __________________
                   in common                                                           (State)
</TABLE>

   Additional abbreviations may also be used though not in the above list.

For value received, __________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
   IDENTIFYING NUMBER OF ASSIGNEE
[                                    ]

________________________________________________________________________________
PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE

________________________________________________________________________________

________________________________________________________________________________

_________________________________________________________________________ Shares
of the Common Stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint _____________________________________________
Attorney to transfer the said stock on the books of the within-named
Corporation with full power of substitution in the premises.

Dated ________________

                                     ___________________________________________
                                     NOTICE: THE SIGNATURE TO THIS ASSIGNMENT
                                     MUST CORRESPOND WITH THE NAME AS WRITTEN
                                     UPON THE FACE OF THE CERTIFICATE IN
                                     EVERY PARTICULAR, WITHOUT ALTERATION OR
                                     ENLARGEMENT OR ANY CHANGE WHATEVER.

                                     THE SIGNATURE(S) SHOULD BE GUARANTEED BY
                                     AN "ELIGIBLE GUARANTOR INSTITUTION"
                                     WITH MEMBERSHIP IN AN APPROVED SIGNATURE
                                     GUARANTEE MEDALLION PROGRAM, PURSUANT
                                     TO S.E.C. RULE 17Ad-15 UNDER THE SECURITIES
                                     EXCHANGE ACT OF 1934, AS AMENDED.

                                     SIGNATURE(S) GUARANTEED BY:

                                     ___________________________________________<PAGE>   1

                                                                    EXHIBIT 10.1

                     AMENDMENT NO. 17 TO THE LOAN DOCUMENTS

         AMENDMENT NO. 17 TO THE LOAN DOCUMENTS dated as of April 10, 2000 to
the Amended and Restated Credit Agreement dated as of June 9, 1998 (as amended
and otherwise modified by Amendment and Waiver No. 1 to the Loan Documents
dated as of December 4, 1998, Amendment No. 2 to the Loan Documents dated as of
January 13, 1999, Amendment No. 3 to the Loan Documents dated as of February 9,
1999, Amendment and Waiver No. 4 to the Loan Documents dated as of March 18,
1999, Amendment and Waiver No. 5 to the Loan Documents dated as of April 1,
1999, Amendment No. 6 to the Loan Documents dated as of April 14, 1999,
Amendment No. 7 to the Loan Documents dated as of June 29, 1999, Amendment No.
8 to the Loan Documents dated as of August 2, 1999, Amendment No. 9 to the Loan
Documents dated as of August 16, 1999, Amendment No. 10 to the Loan Documents
dated as of August 23, 1999, Amendment No. 11 to the Loan Documents dated as of
August 30, 1999, Amendment No. 12 to the Loan Documents dated as of September
14, 1999, Amendment No. 13 to the Loan Documents dated as of November 5, 1999,
Amendment No. 14 to the Loan Documents dated as of December 16, 1999, Amendment
No. 15 to the Loan Documents dated as of January 20, 2000 and Amendment No. 16
to the Loan Documents dated as of February 3, 2000, (the "CREDIT AGREEMENT")
among Caremark Rx, Inc. (formerly known as MedPartners, Inc.), a Delaware
corporation (the "BORROWER"), the Lenders party thereto, Bank of America, N.A.
(formerly NationsBank, N.A.; "BOFA"), as the Initial Issuing Bank and the Swing
Line Bank thereunder, Credit Lyonnais New York Branch, The First National Bank
of Chicago and Morgan Guaranty Trust Company of New York, as the Syndication
Agents therefor, Banc of America Securities LLC (formerly NationsBanc
Montgomery Securities LLC), as the Arranger therefor, and BofA, as the
Administrative Agent for the Lender Parties thereunder. Capitalized terms not
otherwise defined in this Amendment have the same meanings as specified
therefor in the Credit Agreement.

                             PRELIMINARY STATEMENTS

         (1) The Borrower has requested that the Lender Parties agree to amend
the Credit Agreement as provided herein in order to permit the Borrower to use
the proceeds from the issuance of Equity Interests in accordance with the TAPS
Purchase Contract to purchase, redeem, defease or similarly provide for the
payment of its senior subordinated notes issued pursuant to the TAPS Indenture
and to prepay the Term Facilities.

         (2) The Lender Parties have indicated their willingness to agree to
amend the Credit Agreement and to waive such default on the terms and subject
to the satisfaction of the conditions set forth herein.

         NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein and in the Loan Documents, the
parties hereto hereby agree as follows:

         SECTION 1. Amendments of Certain Provisions of the Credit Agreement.
The Credit Agreement is, upon the occurrence of the Amendment Effective Date
(as hereinafter defined), hereby amended as follows:

         (a) Section 1.01 of the Credit Agreement is hereby amended to delete
the definition "Term A Amortization Reserve" and to add the following new
definitions in their appropriate alphabetical order:
<PAGE>   2
                  "AMENDMENT NO. 17. EFFECTIVE DATE" means the first date on
         which all of the conditions precedent to the effectiveness of Amendment
         No. 17 to the Loan Documents were satisfied.

                  "AMENDMENT NO. 17 CASH PROCEEDS" means the gross proceeds from
         each issuance and sale of Borrower Common Stock to holders of the TAPS
         pursuant to the TAPS Purchase Contract not applied on the date of such
         issuance and sale to automatically and permanently reduce the Term
         Facilities or to purchase, pay, legally defease or otherwise retire
         Senior Subordinated Notes as provided by Section 2.05(b)(vi)(C).

                  "AMENDMENT NO. 17 CASH PROCEEDS RESERVE" means the aggregate
         amount of Amendment No. 17 Cash Proceeds.

                  "SENIOR SUBORDINATED NOTES" means the senior subordinated
         notes issued under the TAPS Indenture.

         (b) The definition of "Unused Revolving Credit Commitment" in Section
1.01 is amended to delete subclause (b)(ii)(D)(2) thereof and to substitute for
such clause the following clause: "(2) the aggregate amount of the Amendment No.
17 Net Cash Proceeds Reserve, to the extent it has not been eliminated as
provided in Section 2.01(c)(iii)."

         (c) Section 2.01(c) of the Credit Agreement is hereby amended to (i)
delete the parenthetical phrase in the fourth sentence of subparagraph (i)
thereof and substitute for such parenthetical phrase the following: "(other than
as expressly provided for in subparagraph (ii) or (iii) of this Section
2.01(c))" and (ii) to amend subparagraph (iii) immediately following
subparagraph (ii) thereof to read in full as follows:

                  "(iii) Amendment No. 17 Cash Proceeds Reserve. The Revolving
         Credit Commitment of each Revolving Credit Lender shall be deemed
         utilized at any time and from time to time by such Lender's Pro Rata
         Share of the aggregate amount of the Amendment No. 17 Cash Proceeds
         Reserve; provided, however, that the Amendment No. 17 Cash Proceeds
         Reserve may not be established at any time in an amount that exceeds
         the aggregate Unused Revolving Credit Commitments of the Revolving
         Credit Lenders at such time. The amount of the Amendment No. 17 Cash
         Proceeds Reserve shall be available to be borrowed solely for purposes
         of purchasing, paying, legally defeasing or otherwise retiring the
         Senior Subordinated Notes (but not in the case of any Senior
         Subordinated Note in excess of par plus accrued interest thereof). From
         the Amendment No. 17 Effective Date to and including the maturity date
         of the Senior Subordinated Notes, the amount of the Amendment No. 17
         Cash Proceeds Reserve shall be reduced by the aggregate amount used by
         the Borrower to purchase, pay, legally defease or otherwise retire the
         Senior Subordinated Notes (but not in the case of any Senior
         Subordinated Note in excess of par plus accrued interest thereof). On
         the day after such maturity date, the Amendment No. 17 Cash Proceeds
         Reserve shall be eliminated in full, and, notwithstanding any other
         provisions of this Agreement, the aggregate amount in the Amendment No.
         17 Cash Proceeds Reserve at such date shall be deemed to constitute a
         Revolving Credit Borrowing on such date in such aggregate amount and
         the Borrower irrevocably hereby authorizes the Administrative Agent on
         such date to reduce the Term Commitments in the amount of such
         Revolving Credit

                                       2
<PAGE>   3
         Borrowing in accordance with, and to the extent required under, Section
         2.05(b)(vi) and to prepay the Term Advances outstanding at such time in
         accordance with, and to the extent required under Section 2.06(b)."

         (d) Section 2.05(b)(vi)(C) is amended in full to read as follows:

                  "(C) the issuance or sale by the Borrower or any of its
         Subsidiaries of any Equity Interests therein (other than: (x) the
         issuance of the Trust Convertible Preferred Interests, but solely to
         the extent that the Net Cash Proceeds thereof are applied in accordance
         with subsection (viii) hereof, (y) the issuance by the Borrower of
         Equity Interests upon the conversion of the Trust Convertible Preferred
         Interests, and (z) until the legal defeasance, payment, purchase and
         cancellation or other retirement of the Senior Subordinated Notes, any
         issuance or sale of Borrower Common Stock to holders of the TAPS
         pursuant to the TAPS pursuant to the TAPS Purchase Contract; provided,
         that until the payment, legal defeasance, purchase and cancellation or
         other retirement of the Senior Subordinated Notes; 12 1/2% of the gross
         proceeds from the issuance and sale from time to time of such Borrower
         Common Stock shall be applied to automatically and permanently reduce
         the Term Facilities as provided herein and the remainder of such gross
         proceeds shall be (I) applied on the date of such issuance and sale to
         purchase, pay, legally defease or otherwise retire at no more than par
         plus accrued interest Senior Subordinated Notes, or (II) retained by
         the Borrower); and".

         (e) Section 5.02(f) is amended by (i) deleting the word "and" at the
end of subsection (v) thereof, (ii) deleting the period at the end of subsection
(vi) thereof, and substituting therefor the word "; and" and (iii) adding a new
subsection (vii) at the end thereof to read as follows:

                  "(vii) in connection with the settlement or adjudication of
                  litigation or claims in respect of the TAPS, the Borrower may
                  acquire the TAPS or any portion thereof, provided that the
                  consideration for such acquisition shall consist solely of
                  Borrower Common Stock and cash in an amount not in excess of
                  the accrued interest due on the acquired TAPS through the
                  respective date of acquisition."

         (f) Section 5.02(h)(i) is amended to delete the "and" at the end of
subsection (G) thereof and to add an "and" at the end of subsection (H) and to
add a new subsection (I) at the end of such Section to read as follows:

                  "(I) The purchase, payment, legal defeasance or other
         retirement (in each case at no more than par plus accrued interest) of
         any Senior Subordinated Notes at or prior to the maturity thereof in an
         aggregate amount not in excess of the Amendment No. 17 Cash Proceeds
         Reserve."

         SECTION 2. Conditions Precedent to the Effectiveness of this
Amendment. This Amendment shall become effective as of the first date (the
"AMENDMENT EFFECTIVE DATE") on which, and only if, each of the following
conditions precedent shall have been satisfied:

         (a) The Administrative Agent shall have received on or before 5:00
p.m. (Charlotte time) on April 11, 2000, (i) counterparts of this Amendment
executed by the Borrower and the Required Lenders or, as to any of the Lender
Parties, advice satisfactory to the Administrative Agent that such

                                       3
<PAGE>   4
Lender Party has executed this Amendment and (ii) counterparts of the Consent
attached hereto executed and delivered by each of the Loan Parties (other than
the Borrower).

         (b) The representations and warranties set forth in each of the Loan
Documents shall be correct in all material respects on and as of the Amendment
Effective Date, before and after giving effect to this Amendment, as though
made on and as of such date (except (i) for any such representation and
warranty that, by its terms, refers to a specific date other than the Amendment
Effective Date, in which case as of such specific date, (ii) that the
Consolidated financial statements of the Borrower and its Subsidiaries referred
to in Sections 4.01(f) and 4.01(g) of the Credit Agreement shall be deemed to
refer to the Consolidated financial statements of the Borrower and its
Subsidiaries comprising part of the Required Financial Information most
recently delivered to the Administrative Agent and the Lender Parties pursuant
to Sections 5.03(b) and 5.03(c), respectively, on or prior to the Amendment
Effective Date and (iii) that the forecasted Consolidated financial statements
of the Borrower and its Subsidiaries referred to in Section 4.01(h) of the
Credit Agreement shall be deemed to refer to the forecasted Consolidated
financial statements of the Borrower and its Subsidiaries most recently
delivered to the Administrative Agent and the Lender Parties prior to the
Amendment Effective Date).

         (c) No event shall have occurred and be continuing, or shall result
from the effectiveness of this Amendment, that constitutes a Default.

         (d) All of the reasonable fees and expenses of the Administrative
Agent and the Arranger (including the reasonable fees and expenses of counsel
for the Administrative Agent) due and payable on the Amendment Effective Date
shall have been paid in full.

         The effectiveness of this Amendment is further conditioned upon the
accuracy of all of the factual matters described herein. This Amendment is
subject to the provisions of Section 8.01 of the Credit Agreement.

         SECTION 3. Reference to and Effect on the Loan Documents. (a) On and
after the Amendment Effective Date, each reference in the Credit Agreement to
"this Agreement," "hereunder," "hereof" or words of like import referring to
the Credit Agreement, and each reference in the Notes and each of the other
Loan Documents to "the Credit Agreement," "thereunder," "thereof" or words of
like import referring to the Credit Agreement, shall mean and be a reference to
the Credit Agreement, as amended by this Amendment.

         (b) The Credit Agreement, the Notes and each of the other Loan
Documents, as amended by the amendments specifically provided above in Section
1, are and shall continue to be in full force and effect and are hereby in all
respects ratified and confirmed. The execution, delivery and effectiveness of
this Amendment shall not, except as expressly provided herein, operate as a
waiver of any right, power or remedy of any of the Guaranteed Parties or the
Administrative Agent under any of the Loan Documents, or constitute a waiver of
any provision of any of the Loan Documents.

         SECTION 4. Costs and Expenses. The Borrower hereby agrees to pay, upon
demand, all of the reasonable costs and expenses of the Administrative Agent
and the Arranger (including, without limitation, the reasonable fees and
expenses of counsel for the Administrative Agent and of Sugarman & Company LLP)
in connection with the preparation, execution, delivery, administration,
modification and amendment of this Amendment and all of the agreements,
instruments and other documents delivered or to be delivered in connection
herewith, all in accordance with the terms of Section 8.04 of the Credit
Agreement.

                                       4
<PAGE>   5
         SECTION 5. Execution in Counterparts. This Amendment may be executed
in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment by
telecopier shall be effective as delivery of a manually executed counterpart of
this Amendment.

         SECTION 6. Governing Law. This Amendment shall be governed by, and
construed in accordance with, the laws of the State of New York.

                                       5
<PAGE>   6
         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be executed by their respective officers, thereunto duly authorized, as of the
date first written above.

                                        THE BORROWER

                                        CAREMARK RX, INC.
                                        (formerly known as MEDPARTNERS, INC.)

                                        By: /s/ PETER J. CLEMENS, IV
                                            ----------------------------------
                                            Name: Peter J. Clemens, IV
                                            Title: SVP & Treasurer

                                        THE ADMINISTRATIVE AGENT
                                        BANK OF AMERICA, N.A.

                                        By: /s/ WILLIAM C. NELSON
                                            ----------------------------------
                                            Name: William C. Nelson
                                            Title: Managing Director

                                       6
<PAGE>   7

                                       THE LENDER PARTIES

                                       BANK OF AMERICA, N.A., as a Lender,
                                       the Swing Line Bank and the Issuing Bank

                                       By    /s/ WILLIAM C. NELSON
                                         ------------------------------------
                                         Name: William C. Nelson
                                         Title: Managing Director

                                       AMSOUTH BANK

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       THE CHASE MANHATTAN BANK

                                       By   /s/ DAWN LEE LURA
                                         ------------------------------------
                                         Name:  Dawn Lee Lura
                                         Title: Vice President

                                       CITIBANK, N.A.

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       CREDIT LYONNAIS NEW YORK BRANCH

                                       By   /s/ HENRY J. REUKAUF
                                         ------------------------------------
                                         Name:  Henry J. Reukauf
                                         Title: Vice President

                                       DEBT STRATEGIES FUND, INC.

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       7
<PAGE>   8

                                        BANK ONE, NA (f/k/a THE FIRST NATIONAL
                                        BANK OF CHICAGO)

                                        By    /s/ L. Richard Schiller
                                          ------------------------------------
                                          Name: L. Richard Schiller
                                          Title: Vice President

                                        FIRST UNION NATIONAL BANK

                                       By /s/ Joyce L. Barry
                                         ------------------------------------
                                         Name: Joyce L. Barry
                                         Title: SVP

                                        FLOATING RATE PORTFOLIO
                                        BY: INVESCO Senior Secured Management,
                                            Inc., as attorney in fact

                                       By /s/ Gregory Stoeckle
                                         ------------------------------------
                                         Name: Gregory Stoeckle
                                         Title: Authorized Signatory

                                        KZH HIGHLAND-2 LLC

                                        By
                                          -------------------------------------
                                          Name:
                                          Title:

                                        MERRILL LYNCH DEBT STRATEGIES
                                          PORTFOLIO, INC.
                                        BY: MERRILL LYNCH ASSET
                                            MANAGEMENT L.P., as Investment
                                            Advisor

                                        By
                                          -------------------------------------
                                          Name:
                                          Title:

                                       8

<PAGE>   9

                                       MERRILL LYNCH GLOBAL INVESTMENT
                                        SERIES: INCOME STRATEGIES PORTFOLIO
                                        BY: MERRILL LYNCH ASSET MANAGEMENT,
                                            L.P., as Investment Advisor

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       MERRILL LYNCH SENIOR FLOATING
                                        RATE FUND, INC.

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       MERRILL LYNCH PRIME RATE PORTFOLIO
                                        BY: MERRILL LYNCH ASSET
                                        MANAGEMENT, L.P., as Investment Advisor

                                       By /s/ CHARLES E. LEMIEUX
                                         ------------------------------------
                                         Name: Charles E. Lemieux, CFA
                                         Title: Assistant Vice President

                                       ML CBO IV (CAYMAN) LTD.
                                        BY: HIGHLAND CAPITAL MANAGEMENT, L.P.,
                                            as Collateral Manager

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       ML CLO XX PILGRIM AMERICA
                                        (CAYMAN) LTD.
                                        By: Pilgrim Investments, Inc.,
                                            as its investment manager

                                       By
                                         ------------------------------------
                                         Name:
                                         Title:

                                       9
<PAGE>   10
                                        MORGAN GUARANTY TRUST COMPANY
                                           OF NEW YORK

                                       By  /s/ ANNA MARIE FALLON
                                         ------------------------------------
                                         Name:  Anna Marie Fallon
                                         Title: Vice President

                                        PAM CAPITAL FUNDING, LP
                                          BY: HIGHLAND CAPITAL MANAGEMENT, L.P.,
                                              as Collateral Manager

                                        By
                                          -------------------------------------
                                          Name:
                                          Title:

                                        PAMCO CAYMAN, LTD.
                                          BY: HIGHLAND CAPITAL MANAGEMENT, L.P.,
                                              as Collateral Manager

                                        By
                                          -------------------------------------
                                          Name:
                                          Title:

                                        PILGRIM PRIME RATE TRUST
                                          BY: Pilgrim Investments, Inc.,
                                              as its investment manager

                                        By /s/ CHARLES E. LEMIEUX, CFA
                                          -------------------------------------
                                          Name: Charles E. LeMieux, CFA
                                          Title: Assistant Vice President

                                        SCOTIABANC INC.

                                       By /s/ DANA MALONEY
                                         ------------------------------------
                                         Name: Dana Maloney
                                         Title: Relationship Manager

                                       10
<PAGE>   11

                                       SRV-HIGHLAND, INC.

                                       By
                                          ------------------------------------
                                          Name:
                                          Title:

                                       STEIN ROE & FARNHAM INCORPORATED,
                                          as Agent for KEYPORT LIFE INSURANCE
                                          COMPANY

                                       By /s/  KATHLEEN A. ZARN
                                          ------------------------------------
                                          Name:  Kathleen A. Zarn
                                          Title: Vice President

                                       TORONTO DOMINION (TEXAS), INC.

                                       By /s/ ALVA J. JONES
                                          ------------------------------------
                                          Name:  Alva J. Jones
                                          Title: Vice President

                                       TRANSAMERICA LIFE INSURANCE AND
                                          ANNUITY CO.

                                       By
                                          ------------------------------------
                                          Name:
                                          Title:

                                       TRANSAMERICA PREMIER HIGH YIELD FUND

                                       By
                                          ------------------------------------
                                          Name:
                                          Title:

                                       VAN KAMPEN PRIME RATE INCOME TRUST

                                       By /s/ DARVIN D. PIERCE
                                          ------------------------------------
                                          Name:  Darvin D. Pierce
                                          Title: Vice President

                                       11
<PAGE>   12

                                       VAN KAMPEN SENIOR INCOME TRUST
                                       By: Van Kampen Investment Advisory Corp.

                                       By /s/ DARVIN D. PIERCE
                                          ------------------------------------
                                          Name:  Darvin D. Pierce
                                          Title: Vice President

                                       VAN KAMPEN CLO II, LIMITED
                                       BY: VAN KAMPEN MANAGEMENT, INC.,
                                           as Collateral Manager

                                       By /s/ DARVIN D. PIERCE
                                          ------------------------------------
                                          Name:  Darvin D. Pierce
                                          Title: Vice President

                                       WACHOVIA BANK, N.A.

                                       By
                                          ------------------------------------
                                          Name:
                                          Title:

                                       12
<PAGE>   13

               CONSENT TO AMENDMENT NO. 17 TO THE LOAN DOCUMENTS

                              As of April 10, 2000

         Reference is made to Amendment No. 17 to the Loan Documents dated as
of April 10, 2000 (the "AMENDMENT") to the Amended and Restated Credit
Agreement dated as of June 9, 1998 (as amended and otherwise modified by
Amendment No. 1 to the Loan Documents dated as of December 4, 1998, Amendment
No. 2 to the Loan Documents dated as of January 13, 1999, Amendment No. 3 to
the Loan Documents dated as of February 9, 1999, Amendment and Waiver No. 4 to
the Loan Documents dated as of March 18, 1999, Amendment and Waiver No. 5 to
the Loan Documents dated as of April 1, 1999, Amendment No. 6 to the Loan
Documents dated as of April 14, 1999, Amendment No. 7 to the Loan Documents
dated as of June 29, 1999, Amendment No. 8 to the Loan Documents dated as of
August 2, 1999, Amendment No. 9 to the Loan Documents dated as of August 16,
1999, Amendment No. 10 to the Loan Documents dated as of August 23, 1999,
Amendment No. 11 to the Loan Documents dated as of August 30, 1999, Amendment
No. 12 to the Loan Documents dated as of September 14, 1999, Amendment No. 13
to the Loan Documents dated as of November 5, 1999, Amendment No. 14 to the
Loan Documents dated as of December 16, 1999, Amendment No. 15 to the Loan
Documents dated as of January 20, 2000 and Amendment No. 16 to the Loan
Documents dated as of February 3, 2000, the ("CREDIT AGREEMENT") among Caremark
Rx, Inc. (formerly known as MedPartners, Inc.), a Delaware corporation, the
Lenders party thereto, Bank of America, N.A. (formerly NationsBank, N.A.), as
the Initial Issuing Bank and Swing Line Bank thereunder, Credit Lyonnais New
York Branch, The First National Bank of Chicago and Morgan Guaranty Trust
Company of New York, as the Syndication Agents therefor, Banc of America
Securities LLC (formerly NationsBanc Montgomery Securities LLC), as Arranger
therefor, and Bank of America, N.A. (formerly NationsBank, N.A.), as the
Administrative Agent for the Lender Parties thereunder. Capitalized terms not
otherwise defined herein shall have the same meanings as specified therefor in
the Credit Agreement.

         Each of the undersigned, as a guarantor under the Subsidiaries
Guarantee dated as of June 9, 1998 (as modified to the date hereof, the
"SUBSIDIARIES GUARANTEE") in favor of the Guaranteed Parties, hereby consents
to the execution and delivery of the Amendment and the performance of the
Credit Agreement, as amended thereby, and hereby confirms and agrees that,
notwithstanding the effectiveness of the Amendment, the Subsidiaries Guarantee
is, and shall continue to be, in full force and effect and is hereby in all
respects ratified and confirmed, except that each reference in the Subsidiaries
Guarantee to "the Credit Agreement," "thereunder," "thereof" or words of like
import referring to the Credit Agreement shall mean and be a reference to the
Credit Agreement, as amended by the Amendment.

         This Consent may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which taken together
shall constitute one and the same Consent. Delivery of an executed counterpart
of a signature page to this Consent by telecopier shall be effective as
delivery of a manually executed counterpart of this Consent.

         This Consent shall be governed by, and construed in accordance with,
the laws of the State of New York.
<PAGE>   14

                           MEDPARTNERS ACQUISITION CORPORATION

                           By    /s/ JAMES H. DICKERSON, JR.
                             -----------------------------------
                              Name:  James H. Dickerson, Jr.
                              Title: President & Treasurer

                           MEDPARTNERS AVIATION, INC.

                           By    /s/ SARA J. FINLEY
                             -----------------------------------
                              Name:  Sara J. Finley
                              Title: Vice President & Secretary

                           MEDPARTNERS EAST, INC.

                           By    /s/ JAMES H. DICKERSON, JR.
                             -----------------------------------
                              Name:  James H. Dickerson, Jr.
                              Title: President & Treasurer

                           MEDPARTNERS INTEGRATED
                           NETWORK-CHANDLER, INC.

                           By    /s/ JAMES H. DICKERSON, JR.
                             -----------------------------------
                              Name:  James H. Dickerson, Jr.
                              Title: Vice President & Treasurer

                           MEDPARTNERS PROFESSIONAL
                           MANAGEMENT CORPORATION

                           By    /s/ JAMES H. DICKERSON, JR.
                             -----------------------------------
                              Name:  James H. Dickerson, Jr.
                              Title: President & Treasurer

                           HEALTHWAYS, INC.

                           By    /s/ JAMES H. DICKERSON, JR.
                             -----------------------------------
                              Name:  James H. Dickerson, Jr.
                              Title: President & Treasurer

                                       2

<PAGE>   15

                                       BAY AREA PRACTICE MANAGEMENT
                                       GROUP, INC.

                                       By   /s/ SARA J. FINLEY
                                         ------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Vice President & Secretary

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Vice President & Treasurer

                                       CHS MANAGEMENT, INC.

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: President and Treasurer

                                       CAREMARK INTERNATIONAL INC.

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: President & Treasurer

                                       CAREMARK INC.

                                       By   /s/ SARA J. FINLEY
                                         ------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Vice President & Secretary

                                       By   /s/ LEISA KIZER
                                         ------------------------------------
                                         Name:  Leisa Kizer
                                         Title: Treasurer

                                       3

<PAGE>   16

                                       PRESCRIPTION HEALTH SERVICES, INC.

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Vice President & Treasurer

                                       By   /s/ SARA J. FINLEY
                                         ------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Vice President & Secretary

                                       CAREMARK INTERNATIONAL HOLDINGS INC.

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Vice President & Treasurer

                                       MEDPARTNERS PHYSICIAN SERVICES INC.

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Vice President & Treasurer

                                       FRIENDLY HILLS HEALTHCARE
                                       NETWORK INC.

                                       By   /s/ SARA J. FINLEY
                                         ------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Vice President & Secretary

                                       MEDPARTNERS NSC LTD.

                                       By   /s/ JAMES H. DICKERSON, JR.
                                         ------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Vice President & Treasurer

                                       4
<PAGE>   17
                                        MEDPARTNERS ADMINISTRATIVE
                                        SERVICES, INC.

                                        By /s/ JAMES H. DICKERSON, JR.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: Vice President & Treasurer

                                        MEDPARTNERS MANAGED CARE, INC.

                                        By /s/ SARA J. FINLEY
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                        ACUTE CARE MEDICAL MANAGEMENT, INC.

                                        By /s/ SARA J. FINLEY
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                        BGS HEALTHCARE, INC.

                                        By /s/ SARA J. FINLEY
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                        HOME HEALTH AGENCY OF GREATER
                                        MIAMI, INC.

                                        By /s/ SARA J. FINLEY
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                        PACIFIC MEDICAL GROUP, INC.

                                        By /s/ SARA J. FINLEY
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                       5

<PAGE>   18
                                        PACIFIC PHYSICIAN SERVICES, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        PPS EAST, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        PPS NORTH CAROLINA MEDICAL
                                        MANAGEMENT, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        PPS RIVERSIDE DIVISION ACQUISITION
                                        AND MANAGEMENT CORP. I

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        PPS VALLEY MANAGEMENT, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        By /s/ Sara J. Finley
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                       6
<PAGE>   19
                                        PACIFIC PHYSICIAN SERVICES
                                        ARIZONA, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        PACIFIC PHYSICIAN SERVICES
                                        NEVADA, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        PHYSICIANS' HOSPITAL MANAGEMENT
                                        CORPORATION

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: Vice President & Treasurer

                                        RELIANT HEALTHCARE SYSTEMS, INC.

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: President & Treasurer

                                        By /s/ Sara J. Finley
                                          -------------------------------------
                                          Name:  Sara J. Finley
                                          Title: Vice President & Secretary

                                        MEDPARTNERS/TALBERT MEDICAL
                                        MANAGEMENT CORPORATION

                                        By /s/ James H. Dickerson, Jr.
                                          -------------------------------------
                                          Name:  James H. Dickerson, Jr.
                                          Title: Vice President & Treasurer

                                       7

<PAGE>   20

                              TALBERT MEDICAL MANAGEMENT
                              CORPORATION

                              By   /s/  James H. Dickerson, Jr.
                                 -------------------------------------------
                                 Name:  James H. Dickerson, Jr.
                                 Title: Vice President & Treasurer

                              TALBERT HEALTH SERVICES
                              CORPORATION

                              By   /s/  James H. Dickerson, Jr.
                                 -------------------------------------------
                                 Name:  James H. Dickerson, Jr.
                                 Title: Vice President & Treasurer

                              MEDPARTNERS ADMINISTRATION, L.P.

                              By   /s/  James H. Dickerson, Jr.
                                 -------------------------------------------
                                 Name:  James H. Dickerson, Jr.
                                 Title: Executive Vice President & Treasurer
                                        of Caremark Rx, Inc., the General
                                        Partner

                              MEDPARTNERS PHYSICIAN
                              MANAGEMENT, L.P.

                              By   /s/  James H. Dickerson, Jr.
                                 -------------------------------------------
                                 Name:  James H. Dickerson, Jr.
                                 Title: Executive Vice President of
                                        Caremark Rx, Inc., the General
                                        Partner

                              MED TENNESSEE, INC.

                              By   /s/  James H. Dickerson, Jr.
                                 -------------------------------------------
                                 Name:  James H. Dickerson, Jr.
                                 Title: President & Treasurer

                                       8

<PAGE>   21
                                       MEDPARTNERS PHYSICIAN SERVICES OF
                                       ILLINOIS L.L.C.

                                       By  /s/ JAMES H. DICKERSON, JR.
                                         ---------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Vice President & Treasurer of
                                                North Suburban Clinic, Ltd.,
                                                a Member

                                       CERRITOS INVESTMENT GROUP

                                       By  /s/ JAMES H. DICKERSON, JR.
                                         ---------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Executive Vice President & Chief
                                                Financial Officer of Caremark
                                                Rx, Inc., a Partner

                                       By  /s/ SARA J. FINLEY
                                         ---------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Corporate Secretary of
                                                Caremark Rx, Inc., a Partner

                                       CERRITOS INVESTMENT GROUP II

                                       By  /s/ JAMES H. DICKERSON, JR.
                                         ---------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Executive Vice President & Chief
                                                Financial Officer of Caremark
                                                Rx, Inc., a Partner

                                       By  /s/ SARA J. FINLEY
                                         ---------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Corporate Secretary of Caremark
                                                Rx, Inc., a Partner

                                       9
<PAGE>   22
                                       5000 AIRPORT PLAZA, L.P.

                                       By    /s/ JAMES H. DICKERSON, JR.
                                         --------------------------------------
                                         Name:  James H. Dickerson, Jr.
                                         Title: Executive Vice President &
                                                Chief Financial Officer of
                                                Caremark Rx, Inc., the
                                                General Partner

                                       By    /s/ SARA J. FINLEY
                                         --------------------------------------
                                         Name:  Sara J. Finley
                                         Title: Corporate Secretary of Caremark
                                                Rx, Inc., the General Partner

                                       10

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