AMENDMENT NO. 1 TO STOCK AND WARRANT PURCHASE AGREEMENT
                 -------------------------------------------------------


        THIS AMENDMENT NO. 1 TO STOCK AND WARRANT PURCHASE AGREEMENT (this
"Amendment")  dated as of January 25, 1996,  is executed,  agreed to and adopted
for good and valuable  consideration  by MAGELLAN HEALTH  SERVICES,  INC. (f/k/a
Charter  Medical  Corporation),  a  Delaware  corporation  (the  "Company")  and
RAINWATER-MAGELLAN  HOLDINGS, L.P., a limited partnership formed pursuant to the
provisions of the Texas Revised Limited Partnership Act ("Buyer");


                              W I T N E S S E T H:
                              --------------------

        WHEREAS, the Company and Richard E. Rainwater (the "Initial Buyer") have
previously  entered into that certain Stock and Warrant Purchase Agreement dated
as of December 22, 1995 (the "Purchase Agreement"); and

        WHEREAS,  in accordance with Section 10.3 of the Purchase  Agreement and
pursuant  to that  certain  Assignment  and  Assumption  Agreement  of even date
herewith (the  "Assignment"),  the Initial Buyer assigned its rights,  interests
and  obligations  under the Purchase  Agreement to Buyer,  and Buyer assumed the
Initial Buyer's liabilities, covenants and obligations thereunder; and

        WHEREAS,  the Assignment  provides that the Purchase  Agreement shall be
amended to reflect the substitution of Buyer under the Purchase Agreement; and

        WHEREAS,  the  parties  hereto  desire to  further  amend  the  Purchase
Agreement to make certain clarifications therein; and

        NOW,  THEREFORE,  in  consideration  of the  premises and other good and
valuable   consideration,   the   adequacy  and  receipt  of  which  are  hereby
acknowledged, the parties hereby agree as follows:

        1.     Defined Terms.  Capitalized terms used in this Amendment and not
defined herein shall have the respective meanings given to them in the Purchase
Agreement.

        2.     Amendments to the Purchase Agreement.

        (a) Annex I to the  Purchase  Agreement  shall be amended to replace the
Initial  Buyer with  Buyer  under the column  headed  "Name of Buyer."  The term
"Buyer" wherever referred to in the Purchase Agreement or in any Exhibit,  Annex
or Schedule thereto is amended to refer to  Rainwater-Magellan  Holdings,  L.P.,
and the term  "party" or  "parties"  shall,  in  addition  to  referring  to the
Company, refer to Rainwater-Magellan Holdings, L.P.

        (b)    Section 1.3 of the Purchase Agreement is hereby amended to read 
in its entirety as follows:

        "The parties  hereto  acknowledge  that the  allocation  of the Purchase
        Price  between  the  Shares and the  Warrants  was made by them in arm's
        length  negotiation  and agree that as of the date hereof the  aggregate
        Purchase Price for the Securities shall be allocated  $2,000,000 for the
        Warrants and $67,732,000 for the Shares."





                                      





        (c) The first  sentence  of Section  5.4 of the  Purchase  Agreement  is
amended by adding the following at the end:

        "or the Company's Board of Directors will elect an Initial Designee 
        acceptable to the Company to fill a vacancy in the Board of Directors."

        (d)  Section  5.5 of the  Purchase  Agreement  is hereby  amended to (i)
correct the reference to "March 31, 1995"  appearing in the  thirteenth  line of
such  Section,  to "March 31,  1996" and (ii) to delete the period at the end of
such section and insert the following proviso:

        ";  provided  that, if Buyer shall have incurred only one HSR Act filing
        fee as of the  Closing,  then  the  Company's  obligation  to  reimburse
        Rainwater,  Inc.  for a  second  HSR  filing  fee and  related  expenses
        pursuant to clause (ii)(A) above,  shall survive such Closing so that if
        Buyer is required to make an  additional  filing for HSR Act approval in
        connection with an exercise of the Warrants, the Company shall reimburse
        Buyer or Rainwater,  Inc. (as  applicable)  for such filing fee together
        with all  other  fees and  expenses  (including  fees  and  expenses  of
        counsel) incurred in connection with such filing."

        (e) Section 10.2 of the Purchase  Agreement is hereby  amended to delete
the period at the end of such section and insert the following:

        ", including, but not limited to, that certain letter of intent (and 
        attached term sheet) by and between the Company and Rainwater, Inc. 
        dated December 15, 1995, and that certain Confidentiality Agreement by 
        and between the Company and Rainwater, Inc. dated as of November 20, 
        1995."

        3.     Effect of Amendment.  Except as heretofore expressly set forth 
in this Amendment, all terms and provisions of the Purchase Agreement shall 
remain in full force and effect as originally executed.

        4.     Counterparts.  This Amendment may be executed in any number of 
counterparts, and each of such counterparts shall for all purposes be deemed to
be an original, and all such counterparts shall together constitute but one and
the same instrument.





               [Remainder of this page intentionally left blank.]








                                        -2-





        IN WITNESS  WHEREOF,  the parties have executed this Amendment as of the
date first above written.

                                 MAGELLAN HEALTH SERVICES, INC.



                                 By:   /s/ Craig L. McKnight
                                    ----------------------------------------
                                    Craig L. McKnight, Executive Vice President
                                    and Chief Financial Officer





                                   RAINWATER-MAGELLAN HOLDINGS, L.P.

                                   By:   Rainwater, Inc., General Partner



                                   By:   /s/ Kenneth A. Hersh
                                      -----------------------------------------
                                      Kenneth A. Hersh, Vice President



















40334 00002 CORP 106126



                                    -3-