ADDITIONAL CREDIT AGREEMENT


     THIS ADDITIONAL CREDIT AGREEMENT (the "Agreement") is made and entered into
as of the 23rd day of January,  1996,  by and among  COMERICA  BANK,  a Michigan
banking corporation ("Bank") and CONTINENTAL MANAGED PHARMACY SERVICES, INC., an
Ohio corporation (the "Company"), and its wholly-owned subsidiaries, CONTINENTAL
PHARMACY,  INC., an Ohio  corporation,  PREFERRED RX, INC., an Ohio corporation,
AUTOMATED  SCRIPTS,  INC., an Ohio corporation,  and VALLEY PHYSICIAN  SERVICES,
INC.,  an  Ohio  corporation  (the  Company  and  each  of  its   aforementioned
wholly-owned  subsidiaries shall be referred to collectively  hereinafter as the
"Borrower").

                                    RECITALS

     A. The  Borrower  and the  Bank  are the  parties  to that  certain  Letter
Agreement  dated  January 24, 1995 (the "Letter  Agreement")  pursuant to which,
inter alia, the Bank extended to the Borrower:  (i) a revolving  credit facility
in the maximum  principal amount of $6,500,000;  and (ii) a term credit facility
in the maximum principal amount of $750,000, subject to the terms and conditions
thereof.

     B.  The  Borrower  has  requested  the  Bank  to  make  available  to it an
additional term credit facility in the maximum principal amount of $500,000; and
the Bank is willing to do so subject to the terms,  covenants and conditions set
forth herein.

     C.  Capitalized  terms used in this  Agreement  and not  otherwise  defined
herein shall have the meanings assigned to them in the Letter Agreement.

                                   AGREEMENTS:

     IN  CONSIDERATION  of the foregoing  Recitals and of the mutual  agreements
hereinafter set forth and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

     1. $500,000 Term Credit  Facility.  The Bank shall extend to the Borrower a
term credit facility in the maximum  principal amount of $500,000 (the "$500,000
Term Facility"). Borrower's obligation to repay the $500,000 Term Facility shall
be  evidenced  by and  subject  to a  promissory  note (the  "Note") in form and
substance  acceptable to the Bank.  The $500,000 Term Facility shall be governed
by and subject to the Note and all of the terms and conditions  contained in the
Letter Agreement.

     2.  Effective  Date;  Conditions  Precedent.  The Bank  and the  Borrower's
respective  obligations  with respect to the  $500,000  Term  Facility  shall be
effective as of the date of the  execution  of this  Agreement  (the  "Effective
Date");  provided,  however,  that such  effectiveness  shall be  subject to the
Borrower  satisfying  each  of  the  following  conditions  precedent  as of the
Effective Date:




          (a) There shall be no Event of Default  under the Letter  Agreement or
     any of the Loan Documents;

          (b) The Borrower  shall have  executed and  delivered  the Note to the
     Bank;

          (c) The  Borrower  shall have paid the Bank  $4,000,  in cash,  as the
     Bank's closing fee for costs  incurred by it in connection  with making the
     $500,000 Term Facility available to the Borrower;

          (d)  Simultaneously  with the Borrower's  execution of this Agreement,
     Michael R. Erlenbach shall execute a Reaffirmation  of Guaranty in form and
     substance acceptable to Bank; and

          (e)  The  Borrower  shall  have  delivered  to  the  Bank  such  other
     instruments  and taken such other  actions as the Bank or its  counsel  may
     reasonably request.

     3. The Borrower's  Reaffirmation  of  Representations  and Warranties.  The
Borrower  reaffirms that the  representations  and warranties  made by it in the
Letter  Agreement  are true  and  correct  in all  material  respects  as of the
Effective  Date and no Event of Default or  condition  now  exists  which,  with
notice, lapse of time or both would constitute an Event of Default. The Borrower
reaffirms  that its  representations  and warranties are deemed to be continuing
during  the  life  of  the  Letter  Agreement  and  thereafter  so  long  as any
Liabilities including,  without limitation,  the $500,000 Term Facility,  remain
outstanding.

     4.  Other  Loan  Documents.  Any  reference  in any of the  Loan  Documents
executed and delivered  pursuant to or in connection  with the Letter  Agreement
shall,  from and after  the  Effective  Date be  deemed  to refer to the  Letter
Agreement and this Agreement.

     5.  Confirmation  of  Debt.  (a) The  Borrower  hereby  affirms  all of its
Liabilities  to the Bank  under the  Letter  Agreement  and the Loan  Documents,
affirms the validity  and  enforceability  of all liens and  security  interests
provided for or contemplated by the Letter Agreement and the Loan Documents, and
affirms that the Liabilities  remain as outstanding  obligations of the Borrower
to the  Bank.  The  Borrower  further  acknowledges  and  agrees  that as of the
Effective Date, it has no claim,  defense or set-off right against the Bank, nor
any claim,  defense or set-off to the enforcement by the Bank of the full amount
of the Borrower's Liabilities under the Letter Agreement and the Loan Documents.

     (b)  Notwithstanding  anything  contained  herein to the  contrary,  to the
extent that any claim,  cause of action,  defense or set-off against the Bank or
its  enforcement  of the Letter  Agreement,  any of the Loan  Documents  or this
Agreement, of any nature whatsoever, known or unknown, fixed or contingent, does
nonetheless  exist or may exist on the Effective Date, in further  consideration
of the  Bank's  entering  into this  Agreement,  the  Borrower  irrevocably  and
unconditionally  waives and releases  fully each and every such claim,  cause of
action, defense and set-off.

                                        2



     6. Conflicting Terms: No Other Modifications. To the extent that any of the
terms and  conditions  of; this  Agreement are  inconsistent  with the terms and
conditions of the Letter  Agreement or any of the Loan Documents,  the terms and
conditions of this Agreement shall prevail. Otherwise, unless expressly modified
or superseded  herein,  all of the terms and conditions of the Letter  Agreement
and the Loan Documents shall remain unaffected and in full force and effect.

     7. Binding  Effect;  Governing Law. This Agreement  shall bind and inure to
the  benefit  of  the  parties  hereto  and  their  respective  heirs,  personal
representatives,  successors  and assigns and shall be governed by and construed
in accordance with the laws of the State of Ohio.

     8.  Counterparts.   This  Agreement  may  be  executed  in  any  number  of
counterparts,  each of  which,  when so  executed  and  delivered,  shall  be an
original,  and all of which  counterparts  together shall constitute one and the
same fully executed instrument.

     IN WITNESS  WHEREOF,  the parties  have  hereunto set their hands as of the
date set forth above.

                                                       BANK:

                                                       COMERICA BANK

                                                       By: /s/[ILLEGIBLE]

                                                       Its: Vice President


BORROWER:

CONTINENTAL MANAGED PHARMACY
SERVICE, INC.

By: /s/ MICHAEL R. ERLENBACH
   ---------------------------

Its: Secretary



CONTINENTAL PHARMACY, INC.

By: /s/ MICHAEL R. ERLENBACH
   ---------------------------

                                        3



Its: Secretary

Dated: 1/24/96


PREFERRED RX, INC.

By: /s/ MICHAEL R. ERLENBACH
   ---------------------------

Its: Secretary

Dated: 1/24/96


AUTOMATED SCRIPTS, INC.

By: /s/ MICHAEL R. ERLENBACH
   ---------------------------

Its: Secretary

Dated: 1/24/96


VALLEY PHYSICIANS SERVICES, INC.

By: /s/ MICHAEL R. ERLENBACH
   ---------------------------

Its: Secretary

Dated: 1/24/96