Document:

<PAGE>   1

                                                                   EXHIBIT 10.39

                     AMENDMENT NO. 14 TO THE LOAN DOCUMENTS

                  AMENDMENT NO. 14 TO THE LOAN DOCUMENTS dated as of December
16, 1999, 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, and Amendment No. 13 to the Loan Documents dated as of November 5,
1999 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.

                  (2) The Lender Parties have indicated their willingness to
agree to amend the Credit Agreement 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 to read as follows:

                  (a) Section 1.01 is hereby amended to amend the definition of
"California Transition Plan" to delete the date "December 31, 1999" in subclause
(D) thereof and to substitute therefor the new date "January 31, 2000, or such
later date as may be approved by the Administrative Agent in writing".

                  (b) Section 2.05(b) is hereby amended to delete the date
"December 31, 1999" in subclause (vii)(B) thereof and to substitute therefor the
new date " January 31, 2000, or such later date as may be approved by the
Administrative Agent in writing".
<PAGE>   2

                  (c) Sections 5.02(b)(viii) and 5.02(e)(iii)(D) are hereby
amended to delete the phrase ", as in effect on the Amendment No. 7 Effective
Date" therefrom.

                  (d) Section 5.02(e)(iii)(E) is hereby amended in its entirety
as follows:

         "(E) the Borrower in MPN and the other California Subsidiaries (I) with
         the proceeds of payments made by the Borrower under the MedPartners
         Funding Commitment, or (II) comprised of the issuance of the Letter of
         Credit in favor of the Special Monitor-Examiner (as defined in the
         California Settlement Agreement), with such Letter of Credit to (w)
         have a face amount not to exceed $25,000,000, (x) provide that no draws
         can be made thereunder prior to the adoption of the California
         Transition Plan other than draws in an aggregate amount of not more
         than $12,500,000 made in respect of those Managed Physician Practice
         Provider Claims (as defined in the California Settlement Agreement)
         that are specified in such Letter of Credit and (y) be otherwise as
         required under the California Settlement Agreement,".

                  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 December 29, 1999, (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 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.

                                       2
<PAGE>   3

                  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.

                  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.

                                       3
<PAGE>   4

                  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/ James H. Dickerson, Jr.
                                           -------------------------------------
                                           Name:  James H. Dickerson, Jr.
                                           Title: EVP and CFO

                                      THE ADMINISTRATIVE AGENT

                                      BANK OF AMERICA, N.A.

                                      By      /s/ Michael D. Monte
                                           -------------------------------------
                                           Name:  Michael D. Monte
                                           Title: Managing Director

                                       4
<PAGE>   5

                                       THE LENDER PARTIES

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

                                       By     /s/ Michael D. Monte
                                           -------------------------------------
                                           Name:  Michael D. Monte
                                           Title: Managing Director

                                       AMSOUTH BANK

                                       By     /s/ Allison J. Sanders
                                           -------------------------------------
                                           Name:  Allison J. Sanders
                                           Title: Vice President

                                       THE CHASE MANHATTAN BANK

                                       By     /s/ Dawn Lee Lum
                                           -------------------------------------
                                           Name:  Dawn Lee Lum
                                           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:

                                       5
<PAGE>   6

                              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, PIERCE, FENNER &
                               SMITH INCORPORATED

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

                                       6
<PAGE>   7

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

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

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

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

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

                                       7
<PAGE>   8

                              ML CLO XX PILGRIM AMERICA
                               (CAYMAN) LTD.
                               BY:   PILGRIM INVESTMENTS, INC.,
                                     as Investment Manager

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

                              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 Investment Manager

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

                                       8
<PAGE>   9

                              SCOTIABANC INC.

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

                              SRV-HIGHLAND, INC.

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

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

                              By     /s/ Brian W. Good
                                  -------------------------------------
                                  Name:  Brian W. Good
                                  Title: Vice President & Portfolio Manager

                              TORONTO DOMINION (TEXAS), INC.

                              By     /s/ Sonja R. Jordan
                                  -------------------------------------
                                  Name:  Sonja R. Jordan
                                  Title: Vice President

                              TRANSAMERICA LIFE INSURANCE AND
                                    ANNUITY CO.

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

                              TRANSAMERICA PREMIER HIGH YIELD FUND

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

                                       9
<PAGE>   10

                              VAN KAMPEN PRIME RATE INCOME TRUST

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

                              VAN KAMPEN SENIOR INCOME TRUST

                              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     /s/ Bradley S. Marcus
                                  -------------------------------------
                                  Name:  Bradley S. Marcus
                                  Title: S.V.P.

                                       10
<PAGE>   11

                           CONSENT TO AMENDMENT NO. 14
                              TO THE LOAN DOCUMENTS

                             As of December 16, 1999

                  Reference is made to Amendment No. 14 to the Loan Documents
dated as of December 16, 1999 (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, and Amendment No. 13 to the Loan
Documents dated as of November 5, 1999, 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>   12

                                MEDGP, INC.

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

                                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

                                GEORGIA MEDPARTNERS MANAGEMENT,
                                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

                                       2
<PAGE>   13

                                MEDPARTNERS PROFESSIONAL
                                MANAGEMENT CORPORATION

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

                                ADS HEALTH 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

                                HEALTHWAYS, INC.

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

                                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 & Treasurer

                                       3
<PAGE>   14

                                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 S. Kizer
                                   -------------------------------------
                                   Name:  Leisa S. Kizer
                                   Title: Treasurer

                                CAREMARK PHYSICIAN SERVICES OF TEXAS
                                INC.

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

                                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

                                       4
<PAGE>   15

                                STRATEGIC HEALTHCARE MANAGEMENT,
                                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

                                CAREMARK RESOURCES CORPORATION

                                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

                                       5
<PAGE>   16

                                MEDPARTNERS NSC LTD.

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

                                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

                                       6
<PAGE>   17

                               MEDPARTNERS MANAGED CARE OF SOUTH BROWARD, INC.

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

                               MEDPARTNERS MEDICAL MANAGEMENT OF OHIO, INC.

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

                               LFMG, INC.

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

                               PACIFIC MEDICAL GROUP, INC.

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

                               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

                                      7
<PAGE>   18

                               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

                               PPS INDEMNITY, INC.

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

                               PACIFIC PHYSICIAN SERVICES
                               ARIZONA, INC.

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

                                       8
<PAGE>   19

                                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

                                TALBERT MEDICAL MANAGEMENT
                                CORPORATION

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

                                       9
<PAGE>   20

                                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

                                MEDOHIO, L.P.

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

                                MED TENNESSEE, INC.

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

                                       10
<PAGE>   21

                               MEDTEX, L.P.

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

                               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

                                       11
<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

                                KS-PSI OF TEXAS L.P.

                                By    /s/ James H. Dickerson, Jr.
                                   -------------------------------------
                                   Name:  James H. Dickerson, Jr.
                                   Title: Vice President & Treasurer of
                                          MedPartners Physician Services, Inc.,
                                          the General Partner

                                       12<PAGE>   1
                                                                   EXHIBIT 10.40

                     AMENDMENT NO. 15 TO THE LOAN DOCUMENTS

                  AMENDMENT NO. 15 TO THE LOAN DOCUMENTS dated as of January
20, 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, and Amendment No. 14 to the Loan Documents dated as of
December 16, 1999, 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.

                  (2) The Lender Parties have indicated their willingness to
agree to amend the Credit Agreement 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 to read as follows:

                  (a)      Section 5.03 is hereby amended to delete the number
"30" in subclause (e) thereof and to substitute therefor the new number "60".

                  (b)      Section 5.03 is hereby further amended to delete the
phrase "month (commencing with respect to the month of August 1999)" in the
second line of subclause (v) thereof and to substitute therefor the new phrase
"of the first eleven months in each year and within 60 days after the end of
the twelfth month in each year".

                  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:

<PAGE>   2

         (a) The Administrative Agent shall have received on or before 5:00
p.m. (Charlotte time) on January 25, 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 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

                                       2
<PAGE>   3

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.

                  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.

                                       3
<PAGE>   4

                  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/ James H. Dickerson, Jr.
                                -----------------------------------------------
                                Name:  James H. Dickerson, Jr.
                                Title: EVP and CFO

                           THE ADMINISTRATIVE AGENT

                           BANK OF AMERICA, N.A.

                           By        /s/ Michael D. Monte
                                -----------------------------------------------
                                Name:  Michael D. Monte
                                Title: Managing Director

                                       4
<PAGE>   5

                           THE LENDER PARTIES

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

                           By        /s/ Michael D. Monte
                                -----------------------------------------------
                                Name:  Michael D. Monte
                                Title: Managing Director

                           AMSOUTH BANK

                           By        /s/ Allison J. Sanders
                                -----------------------------------------------
                                Name:  Allison J. Sanders
                                Title: Vice President

                           THE CHASE MANHATTAN BANK

                           By        /s/ Dawn Lee Lum
                                -----------------------------------------------
                                Name:  Dawn Lee Lum
                                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:

                                       5
<PAGE>   6

                           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, PIERCE, FENNER &
                               SMITH INCORPORATED

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

                                       6
<PAGE>   7

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

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

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

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

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

                                       7
<PAGE>   8

                           ML CLO XX PILGRIM AMERICA
                              (CAYMAN) LTD.
                             BY:   PILGRIM INVESTMENTS, INC.,
                                   as Investment Manager

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

                           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 Investment Manager

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

                                       8
<PAGE>   9

                           SCOTIABANC INC.

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

                           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/ Anne Favoriti
                                -----------------------------------------------
                                Name:  Anne Favoriti
                                Title: VP

                           TRANSAMERICA LIFE INSURANCE AND
                                       ANNUITY CO.

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

                           TRANSAMERICA PREMIER HIGH YIELD FUND

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

                                       9
<PAGE>   10

                           VAN KAMPEN PRIME RATE INCOME TRUST

                           By        /s/ Howard Tiffen
                                -----------------------------------------------
                                Name:    Howard Tiffen
                                Title:   Sr. Vice President

                           VAN KAMPEN SENIOR INCOME TRUST

                           By        /s/ Howard Tiffen
                                -----------------------------------------------
                                Name:    Howard Tiffen
                                Title:   Sr. Vice President

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

                           By        /s/ Howard Tiffen
                                -----------------------------------------------
                                Name:    Howard Tiffen
                                Title:   Sr. Vice President

                           WACHOVIA BANK, N.A.

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

                                      10
<PAGE>   11

                          CONSENT TO AMENDMENT NO. 15
                             TO THE LOAN DOCUMENTS

                             As of January 20, 2000

                  Reference is made to Amendment No. 15 to the Loan Documents
dated as of January 20, 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, and Amendment No. 14 to the
Loan Documents dated as of December 16, 1999, 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>   12

                           MEDGP, INC.

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

                           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

                           GEORGIA MEDPARTNERS MANAGEMENT,
                           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

                                       2
<PAGE>   13

                           MEDPARTNERS PROFESSIONAL
                           MANAGEMENT CORPORATION

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

                           ADS HEALTH 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

                           HEALTHWAYS, INC.

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

                           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 & Treasurer

                                       3
<PAGE>   14

                           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 S. Kizer
                                -----------------------------------------------
                                Name:     Leisa S. Kizer
                                Title:    Treasurer

                           CAREMARK PHYSICIAN SERVICES OF TEXAS INC.

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

                           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

                                       4
<PAGE>   15

                           STRATEGIC HEALTHCARE MANAGEMENT, 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

                           CAREMARK RESOURCES CORPORATION

                           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

                                       5
<PAGE>   16

                           MEDPARTNERS NSC LTD.

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

                           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

                                       6
<PAGE>   17

                           MEDPARTNERS MANAGED CARE OF SOUTH
                           BROWARD, INC.

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

                           MEDPARTNERS MEDICAL MANAGEMENT OF
                           OHIO, INC.

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

                           LFMG, INC.

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

                           PACIFIC MEDICAL GROUP, INC.

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

                           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

                                       7
<PAGE>   18

                           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

                           PPS INDEMNITY, INC.

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

                           PACIFIC PHYSICIAN SERVICES
                           ARIZONA, INC.

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

                                       8
<PAGE>   19

                           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

                           TALBERT MEDICAL MANAGEMENT
                           CORPORATION

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

                                       9
<PAGE>   20

                           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

                           MEDOHIO, L.P.

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

                           MED TENNESSEE, INC.

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

                                      10
<PAGE>   21

                           MEDTEX, L.P.

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

                           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

                                      11
<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

                           KS-PSI OF TEXAS L.P.

                           By         /s/ James H. Dickerson, Jr.
                                -----------------------------------------------
                                Name:    James H. Dickerson, Jr.
                                Title:   Vice President & Treasurer of
                                         MedPartners Physician Services, Inc.,
                                         the General Partner

                                       12

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