GUARANTY

     The  undersigned,  for  value  received,   unconditionally  and  absolutely
guarantee(s) to Comerica Bank ("Bank"),  a Michigan  banking  corporation of 500
Woodward  Avenue,  Detroit,  Michigan  48226 and to the  Bank's  successors  and
assigns, payment when due, whether by stated maturity,  demand,  acceleration or
otherwise,  of all existing and future  indebtedness  to the Bank of CONTINENTAL
MANAGED PHARMACY SERVICES, INC., CONTINENTAL PHARMACY, INC., PREFERRED RX, INC.,
AUTOMATED  SCRIPTS,  INC. and VALLEY  PHYSICIANS  SERVICES,  INC.,  each an Ohio
corporation,  whose address is 1400 E. Schaaf Road, Brooklyn Heights, Ohio 44131
and  also  of  any   successor  in  interest,   including   without   limit  any
debtor-in-possession or trustee in bankruptcy which succeeds to the interests of
this party or person  (jointly  and  severally  the  "Borrower"),  however  this
indebtedness  has been or may be  incurred  or  evidenced,  whether  absolute or
contingent,  direct  or  indirect,  voluntary  or  involuntary,   liquidated  or
unliquidated,  joint or several and whether or not known to the  undersigned  at
the time of this  Guaranty  or at the time any fUture  indebtedness  is incurred
(the "Indebtedness").

     The Indebtedness  guaranteed includes without limit: (a) any and all direct
indebtedness of the Borrower to the Bank,  including  indebtedness  evidenced by
any and all promissory  notes; (b) any and all obligations or liabilities of the
Borrower  to the  Bank  arising  under  any  guaranty  where  the  Borrower  has
guaranteed the payment of indebtedness owing to the Bank from a third party; (c)
any and all  obligations or liabilities of the Borrower to the Bank arising from
applications  or agreements  for the issuance of letters of credit;  (d) any and
all  obligations  or  liabilities of the Borrower to the Bank arising out of any
other agreement by the Borrower;  (e) any and all  indebtedness,  obligations or
liabilities for which the Borrower would otherwise be liable to the Bank were it
not for the invalidity,  irregularity or  unenforceability  of them by reason of
any  bankruptcy,  insolvency or other law or order of any kind, or for any other
reason,  including without limit liability for interest and attorney fees on, or
in  connection  with,  any of the  Indebtedness  from and after the filing by or
against  the  Borrower of a  bankruptcy  petition;  (f) any and all  amendments,
modifications, renewals and/or extensions of any of the above, including without
limit amendments,  modifications, renewals and/or extensions which are evidenced
by new or additional instruments,  documents or agreements; and (g) all costs of
collecting Indebtedness, including without limit reasonable attorney fees.

     The  undersigned  waive(s)  notice  of  acceptance  of  this  Guaranty  and
presentment,  demand, protest, notice of protest,  dishonor, notice of dishonor,
notice of  default,  notice of intent to  accelerate  or demand  payment  of any
Indebtedness and diligence in collecting any Indebtedness, and agree(s) that the
Bank may modify the terms of any  Indebtedness,  compromise,  extend,  increase,
accelerate,  renew or forbear to enforce payment of any or all Indebtedness,  or
permit the Borrower to incur additional Indebtedness,  all without notice to the
undersigned and without affecting in any manner the unconditional  obligation of
the undersigned  under this Guaranty.  The undersigned  further waive(s) any and
all other  notices to which the  undersigned  might  otherwise be entitled.  The
undersigned  acknowledge(s)  and agree(s) that the  liabilities  created by this
Guaranty  are direct  and are not  conditioned  upon  pursuit by the Bank of any
remedy  the Bank may have  against  the  Borrower  or any  other  person  or any
security. No invalidity, irregularity or unenforceability of any part or all




of the  Indebtedness  or any  documents  evidencing  the same,  by reason of any
bankruptcy,  insolvency  or other  law or  order  of any  kind or for any  other
reason,  and no defense or setoff  available at any time to the Borrower,  shall
impair,  affect or be a defense or setoff to the  obligations of the undersigned
under this Guaranty.

     The undersigned  deliver(s) this Guaranty based solely on the undersigned's
independent  investigation of the financial condition of the Borrower and is not
relying on any information furnished by the Bank. The undersigned assume(s) full
responsibility for obtaining any further  information  concerning the Borrower's
financial  condition,  the status of the  Indebtedness or any other matter which
the  undersigned  may deem  necessary  or  appropriate  from  time to time.  The
undersigned  waive(s) any duty on the part of the Bank,  and agree(s) that it is
not relying upon nor expecting the Bank to disclose to the  undersigned any fact
now or later known by the Bank,  whether relating to the operations or condition
of the  Borrower,  the  existence,  liabilities  or  financial  condition of any
co-guarantor of the Indebtedness,  the occurrence of any default with respect to
the Indebtedness or otherwise,  notwithstanding  any effect these facts may have
upon the  undersigned's  risk under this  Guaranty or the  undersigned's  rights
against the Borrower. The undersigned knowingly accept(s) the full range of risk
encompassed in this Guaranty, which risk includes without limit the possibility
that the  Borrower  may  incur  Indebtedness  to the Bank  after  the  financial
condition of the Borrower,  or its ability to pay its debts as they mature,  has
deteriorated.

     The undersigned  represent(s) and warrant(s) that: (a) the Bank has made no
representation  to the undersigned as to the  creditworthiness  of the Borrower;
and (b) the  undersigned  has  established  adequate means of obtaining from the
Borrower on a continuing basis financial and other information pertaining to the
Borrower's  financial  condition.  The  undersigned  agree(s) to keep adequately
informed of any facts, events or circumstances which might in any way affect the
risks of the undersigned under this Guaranty.

     The undersigned  grant(s) to the Bank a security  interest in and the right
of  setoff as to any and all  property  of the  undersigned  now or later in the
possession of the Bank. The undersigned  subordinate(s)  any claim of any nature
that the  undersigned  now or later has (have)  against  the  Borrower to and in
favor of all Indebtedness  and, except for short-term  intercompany debt arising
in the ordinary  course of business paid before the occurrence of any default or
event of default under any agreement between Borrower and Bank,  agree(s) not to
accept payment or  satisfaction  of any claim that the  undersigned now or later
may have against the  Borrower  without the prior  written  consent of the Bank.
Except as stated above, should any payment,  distribution,  security or proceeds
be  received  by the  undersigned  upon or with  respect  to any claim  That the
undersigned now or may later have against the Borrower,  the  undersigned  shall
immediately  deliver  the  same to the  Bank in the form  received  (except  for
endorsement  or assignment by the  undersigned  where  required by the Bank) for
application  on the  Indebtedness,  whether  matured  or  unmatured,  and  until
delivered the same shall be held in trust by the  undersigned as the property of
the Bank. The  undersigned  further  assign(s) to the Bank as collateral for the
obligations of the undersigned under this Guaranty all claims of any nature that
the  undersigned now or later has (have) against the Borrower with full right on
the part of the  Bank,  in its own name or in the  name of the  undersigned,  to
collect and enforce these claims.


                                       2




     The undersigned agree(s) that no security now or later held by the Bank for
the payment of any  Indebtedness,  whether from the  Borrower,  any guarantor or
otherwise,  and  whether  in the nature of a security  interest,  pledge,  lien,
assignment,  setoff, suretyship,  guaranty,  indemnity,  insurance or otherwise,
shall affect in any manner the unconditional obligation of the undersigned under
this  Guaranty,  and the Bank,  in its sole  discretion,  without  notice to the
undersigned, may release, exchange, enforce and otherwise deal with any security
without affecting in any manner the unconditional  obligation of the undersigned
under this Guaranty.  The undersigned  acknowledge(s) and agree(s) that the Bank
has no obligation to acquire or perfect any lien on or security  interest in any
asset(s),  whether realty or personalty,  to secure payment of the Indebtedness,
and the  undersigned  is not relying  upon any asset(s) in which the Bank has or
may have a lien or security interest for payment of the Indebtedness.

     The undersigned  acknowledge(s)  that the effectiveness of this Guaranty is
not  conditioned on any or all of the  indebtedness  being  guaranteed by anyone
else.

     The  undersigned  may  terminate the  obligation  under this Guaranty as to
future  Indebtedness  (except  as  provided  below) by (and only by)  delivering
written  notice of  termination  to an officer of the Bank and receiving from an
officer  of  the  Bank  written   acknowledgment  of  delivery;   provided,  the
termination  shall not be  effective  until the  opening of  business on the day
following written  acknowledgment of delivery.  Any termination shall not affect
in  any  way  the  unconditional  obligations  of  the  undersigned  as  to  any
Indebtedness  existing at the effective date of termination or any  Indebtedness
created  after that  pursuant to any  commitment or agreement of the Bank or any
Borrower  loan  with the Bank  existing  at the  effective  date of  termination
(whether advances or readvances by the Bank are optional or obligatory),  or any
modifications,  extensions or renewals of any of this  Indebtedness,  whether in
whole  or in  part,  and as to  all  of  this  Indebtedness  and  modifications,
extensions or renewals of it, this Guaranty shall continue  effective  until the
same shall have been fully  paid.  The  undersigned  shall  indemnifly  the Bank
against  all  claims,  damages,  costs and  expenses,  including  without  limit
reasonable  attorney  fees,  incurred by the Bank in  connection  with any suit,
claim or action against the Bank arising out of any  modification or termination
of a Borrower  loan or any  refusal by the Bank to extend  additional  credit in
connection with the termination of this Guaranty.

     Notwithstanding any prior revocation,  termination,  surrender or discharge
of this Guaranty in whole or in part, the  effectiveness  of this Guaranty shall
automatically  continue or be reinstated,  as the case may be, in the event that
any payment  received or credit given by the Bank in respect of the Indebtedness
is  returned,  disgorged  or rescinded  as a  preference,  impermissible  setoff
fraudulent  conveyance,  diversion  of  trust  funds,  or  otherwise  under  any
applicable state or federal law, including,  without limitation, laws pertaining
to bankruptcy or insolvency, in which case this Guaranty, and all liens, pledges
and security interests securing this Guaranty,  shall be enforceable against the
undersigned as if the returned, disgorged or rescinded payment or credit had not
been received or given by the Bank, and whether or not the Bank relied upon this
payment or credit or changed its position as a  consequence  of it. In the event
of continuation or reinstatement of this Guaranty, the undersigned agree(s) upon
demand by the Bank to execute and deliver to the Bank those  documents which the
Bank  determines are  appropriate to further  evidence (in the public records or
otherwise)


                                       3



this continuation or  reinstatement,  although the failure of the undersigned to
do so shall not  affect in any way the  reinstatement  of  continuation.  If the
undersigned  do(es)  not  execute  and  deliver  to the Bank  upon  demand  such
documents,  the Bank and each  Bank  officer  is  irrevocably  appointed  (which
appointment  is coupled  with an interest)  the true and lawful  attorney of the
undersigned  (with  full power of  substitution)  to execute  and  deliver  such
documents in the name and on behalf of the undersigned.

     The  undersigned  waive(s)  any right to require  the Bank to: (a)  proceed
against any person, including without limit the Borrower; (b) proceed against or
exhaust any security held from the Borrower or any other person; (c) give notice
of the terms,  time and place of any public or private sale of personal property
security  held from the Borrower or any other person,  or otherwise  comply with
the  provisions  of  Section  9-504 of the  Ohio or  other  applicable  Uniform
Commercial  Code;  (d) pursue any other remedy in the Bank's power;  or (e) make
any   presentments  or  demands  for   performance,   or  give  any  notices  of
nonperformance,  protests,  notices  of  protest,  or  notices  of  dishonor  in
connection with any obligations or evidences of Indebtedness held by the Bank as
security,  in connection with any other obligations or evidences of indebtedness
which  constitute in whole or in part  Indebtedness,  or in connection  with the
creation of new or additional Indebtedness.

     The undersigned  authorize(s) the Bank,  either before or after termination
of this  Guaranty,  without notice to or demand on the  undersigned  and without
affecting the undersigned's liability under this Guaranty, from time to time to:
(a) apply any security held from the Borrower or any other person and direct the
order or manner of sale of it,  including  without limit,  a  non-judicial  sale
permitted by the terms of the controlling  security agreement,  mortgage or deed
of trust, as the Bank in its discretion may determine; (b) release or substitute
any one or more of the endorsers or any other  guarantors  of the  Indebtedness;
and  (c)  apply  payments  received  by  the  Bank  from  the  Borrower  to  any
indebtedness  of the  Borrower  to the  Bank,  in such  order as the Bank  shall
determine in its sole discretion, whether or not this indebtedness is covered by
this  Guaranty,  and the  undersigned  waive(s) any  provision of law  regarding
application of payments which specifies  otherwise.  The Bank may without notice
assign  this  Guaranty  in whole  or in  part.  Upon  the  Bank's  request,  the
undersigned  agree(s)  to  provide  to the  Bank  copies  of  the  undersigned's
financial statements.

     The undersigned waive(s) any defense based upon or arising by reason of (a)
any  disability or other  defense of the Borrower or any other  person;  (b) the
cessation  or  limitation  from any  cause  whatsoever,  other  than  final  and
irrevocable  payment in full, of the Indebtedness;  (c) any lack of authority of
any officer,  director,  partner, agent or any other person acting or purporting
to act on behalf of the Borrower  which is a  corporation,  partnership or other
type  of  entity,  or any  defect  in the  formation  of the  Borrower;  (d) the
application  by the  Borrower of the proceeds of any  Indebtedness  for purposes
other than the purposes  represented  by the Borrower to the Bank or intended or
understood by the Bank or the  undersigned;  (e) any act or omission by the Bank
which directly or indirectly results in or aids the discharge of the Borrower or
any  Indebtedness by operation of law or otherwise;  or (f) any  modification of
the   Indebtedness,   in  any  form  whatsoever   including  without  limit  any
modification made after effective  termination,  and including without limit the
renewal,  extension,  acceleration  or other  change in time for  payment of the
Indebtedness,  or  other  change  in the  terms of any  Indebtedness,  including
without limit increase or decrease of the interest


                                       4




rate. The  undersigned  waive(s) any defense the undersigned may have based upon
any  election  of  remedies  by  the  Bank  which  destroys  the   undersigned's
subrogation  rights or the  undersigned's  right to proceed against the Borrower
for  reimbursement,  including  without limit any loss of rights the undersigned
may  suffer by reason of any  rights,  powers or  remedies  of the  Borrower  in
connection with any anti-deficiency, appraisement or valuation laws or any other
laws limiting, qualifying or discharging any Indebtedness.

     The undersigned acknowledge(s) that the Bank has the right to sell, assign,
transfer,  negotiate  or  grant  participations  in  all  or  any  part  of  the
Indebtedness  and  any  related  obligations,  including,  without  limit,  this
Guaranty. In connection with that right, the Bank may disclose any documents and
information which the Bank now or later acquires relating to the undersigned and
this Guaranty,  whether furnished by the Borrower, the undersigned or otherwise.
The undersigned  further agree(s) that the Bank may disclose these documents and
information to the Borrower.

     This  obligation  shall  include,  IN ADDITION  TO any amount of  principal
guaranteed,  any and all interest on all  Indebtedness and any and all costs and
expenses of any kind, including without limit reasonable attorney fees, incurred
by the Bank at any  time(s)  for any reason in  enforcing  any of the duties and
obligations of the undersigned under this Guaranty or otherwise  incurred by the
Bank in any way connected  with this  Guaranty,  the  Indebtedness  or any other
guaranty of the Indebtedness  (including without limit reasonable  attorney fees
and other  expenses  incurred in any suit involving the conduct of the Bank, the
Borrower or the  undersigned).  All of these costs and expenses shall be payable
immediately by the undersigned  when incurred by the Bank,  without demand,  and
until paid shall bear interest a the highest per annum rate applicable to any of
the  Indebtedness,  but not in excess of the maximum rate  permitted by law. Any
reference in this Guaranty to attorney fees shall be deemed a reference to fees,
charges, costs and expenses of both in-house and outside counsel and paralegals,
whether or not a suit or action is  instituted,  and to court costs if a suit or
action is instituted,  and whether  attorney fees or court costs are incurred at
the trial court level,  on appeal,  in a bankruptcy,  administrative  or probate
proceeding or otherwise.

     The undersigned  unconditionally  and  irrevocably  waive(s) each and every
defense  and  setoff of any  nature  which,  under  principles  of  guaranty  or
otherwise,  would operate to impair or diminish in any way the obligation of the
undersigned  under  this  Guaranty.  The  undersigned  acknowledge(s)  that  the
effectiveness of this Guaranty is subject to no conditions of any kind.

     This   Guaranty   shall  remain   effective   with  respect  to  successive
transactions which shall either continue the Indebtedness,  increase or decrease
it,  or from time to time  create  any new  Indebtedness  after all or any prior
Indebtedness has been satisfied, until this Guaranty is terminated in the manner
and to the extent provided above.

     The undersigned  warrant(s) and agree(s) that each of the waivers set forth
above are made with the undersigned's  full knowledge of their  significance and
consequences,  and that under the circumstances,  the waivers are reasonable and
not contrary to public policy or law. If any of these


                                       5




waivers are  determined to be contrary to any  applicable  law or public policy,
these waivers shall be effective only to the extent permitted by law.

     This Guaranty  constitutes the entire  agreement of the undersigned and the
Bank with respect to the subject  matter of this Guaranty.  No waiver,  consent,
modification  or  change  of the terms of this  Guaranty  shall  bind any of the
undersigned  or the Bank unless in writing and signed by the waiving party or an
authorized  officer  of the  waiving  party,  and  then  this  waiver,  consent,
modification or change shall be effective only in the specific  instance and for
the specific purpose given. This Guaranty shall inure to the benefit of the Bank
and  its  successors  and  assigns.  This  Guaranty  shall  be  binding  on  the
undersigned and the  undersigned's,  successors and assigns  including,  without
limit,  any  debtor  in  possession  or  trustee  in  bankruptcy  for any of the
undersigned.  The undersigned has (have) knowingly and voluntarily  entered into
this  Guaranty  in good  faith for the  purpose of  inducing  the Bank to extend
credit  or  make  other  financial  accommodations  to  the  Borrower,  and  the
undersigned  acknowledge(s)  that the terms of this Guaranty are reasonable.  If
any  provision  of this  Guaranty is  unenforceable  in whole or in part for any
reason, the remaining  provisions shall continue to be effective.  THIS GUARANTY
WAS EXECUTED IN CUYAHOGA COUNTY,  OHIO AND SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE  WITH THE LAWS OF THE STATE OF OHIO.  NOTWITHSTANDING  THE FOREGOING,
THE PARTIES  ACKNOWLEDGE THAT THE INDEBTEDNESS  DESCRIBED ABOVE WAS APPROVED AND
MADE  AND THE  PROCEEDS  OF THE  INDEBTEDNESS  WERE  DISBURSED  IN THE  STATE OF
MICHIGAN.

     The  undersigned  waive  any  claims  that  Cuyahoga  County,  Ohio  is  an
inconvenient forum or an improper forum based on lack of venue.

     THE UNDERSIGNED AND BANK  ACKNOWLEDGE  THAT THE RIGHT TO TRIAL BY JURY IS A
CONSTITUTIONAL  ONE, BUT THAT IT MAY BE WAIVED. EACH PARTY, AFTER CONSULTING (OR
HAVING HAD THE  OPPORTUNITY TO CONSULT) WITH COUNSEL OF THEIR CHOICE,  KNOWINGLY
AND VOLUNTARILY,  AND FOR THEIR MUTUAL BENEFIT WAIVES ANY RIGHT TO TRIAL BY JURY
IN THE EVENT OF LITIGATION  REGARDING THE  PERFORMANCE OR ENFORCEMENT  OF, OR IN
ANY WAY RELATED TO, THIS GUARANTY OR THE INDEBTEDNESS.

     The  undersigned  hereby submits to personal  jurisdiction  in the State of
Ohio;  waives any and all personal rights under the laws of any state or country
to  object  to  jurisdiction  within  the  State  of Ohio  for the  purposes  of
litigation  to enforce this  Guaranty;  and consents to be sued in all courts of
general  jurisdiction in Cuyahoga County in the State of Ohio. Nothing contained
in this  Guaranty,  however,  shall  prevent  Bank from  bringing  any action or
exercising  any rights  under this  Guaranty  within any other  state or country
having  jurisdiction  over the subject  matter  hereof  Bank's  initiating  such
proceeding or taking such action in any other state or country shall in no event
constitute a waiver of the agreement contained in this Guaranty that the laws of
the State of Ohio shall govern the rights and obligations of the undersigned and
Bank under this Guaranty or a waiver of the submission  made in this Guaranty by
the  undersigned  to  personal  jurisdiction  within  the  State of Ohio.


                                       6




The  undersigned  agrees  that  service of  process  may be made,  and  personal
jurisdiction over the undersigned  obtained, by sewing a copy of the Summons and
Complaint upon the  undersigned at its address set forth in this Guaranty (or at
the last address of the  undersigned  which is known to Bank) in accordance with
the applicable laws of the States of Ohio and Michigan.

     The  undersigned  hereby  authorizes any  attorney-at-law  to appear in any
court of record in the United  States,  at any time  after the above  obligation
becomes due,  either at its stated  maturity or by  declaration,  and waives the
issuing and service of process, and confesses a judgment against the undersigned
in favor of Bank for the amount then appearing  due,  together with interest and
costs of suit, and thereupon to release all errors and waive all right of appeal
and stay of execution.  No judgment  against the  undersigned  shall be a bar to
subsequent  judgment(s)  against  the  undersigned.  The  foregoing  warrant  of
attorney  shall  survive  any  judgment,  it being  understood  that  should any
judgment be vacated  for any  reason,  the  foregoing  warrant of  attorney  may
nevertheless be used to obtain additional judgments.

         The undersigned has signed this Guaranty on August 24, 1998.

WARNING  -- BY  SIGNING  THIS  PAPER YOU GIVE UP YOUR  RIGHT TO NOTICE AND COURT
TRIAL.  IF YOU DO NOT PAY ON TIME A COURT  JUDGMENT  MAY BE  TAKEN  AGAINST  YOU
WITHOUT  YOUR PRIOR  KNOWLEDGE  AND THE POWERS OF A COURT CAN BE USED TO COLLECT
FROM YOU REGARDLESS OF ANY CLAIMS YOU MAY HAVE AGAINST THE CREDITOR  WHETHER FOR
RETURNED GOODS, FAULTY GOODS,  FAILURE ON HIS PART TO COMPLY WITH THE AGREEMENT,
OR ANY OTHER CAUSE.


Date: August 24, 1998                          GUARANTOR:

                                               MIM Corporation

                                                    By: Robert J. Bush
                                                   ---------------------------

                                                    Its: Assistant Secretary
                                                   ---------------------------


                                       7