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             [AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P. LETTERHEAD]




                                 April 18, 2001






AdvancePCS
5215 North O'Connor Blvd.
Suite 1600
Irving, TX 75039

         Re:      Registration Statement on Form S-4

Ladies and Gentlemen:

         We have acted as counsel to AdvancePCS, a Delaware corporation (the
"COMPANY"), and as special counsel to the Company's subsidiary guarantors
("SUBSIDIARY GUARANTORS") as set forth on Exhibit A hereto, in connection with
the registration, pursuant to a registration statement on Form S-4 (as may be
amended, the "REGISTRATION STATEMENT"), filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended (the "ACT"), of the
offer by the Company to exchange (the "EXCHANGE OFFER") its outstanding 8 1/2%
Senior Notes due 2008 (including the subsidiary guarantees thereto, the "OLD
NOTES") for (i) an equal principal amount of up to $200,000,000 aggregate
principal amount of 8 1/2% Senior Notes due 2008 (the "EXCHANGE NOTES") to be
issued under an Indenture (the "INDENTURE") entered into by the Company and U.S.
Trust Company of Texas, N.A., as Trustee, and (ii) Subsidiary Guarantees of the
Exchange Notes (the "SUBSIDIARY GUARANTEES"), which Exchange Notes and
Subsidiary Guarantees have been registered under the Act.

         We have examined originals or certified copies of such corporate
records of the Company and Subsidiary Guarantors and other certificates and
documents of officials of the Company and Subsidiary Guarantors, public
officials and others as we have deemed appropriate for purposes of this letter.
We have assumed the genuineness of all signatures, the authenticity of all
documents submitted to us as originals, the conformity to authentic original
documents of all copies submitted to us as conformed and certified or reproduced
copies.



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AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.
AdvancePCS
April 18, 2001
Page 2


         Based upon the foregoing and subject to the assumptions, exceptions,
qualifications and limitations set forth hereinafter, we are of the opinion
that:

         1.       The Exchange Notes have been duly authorized by all necessary
                  corporate action on the part of the Company and, when executed
                  by the Company, authenticated by the Trustee and delivered and
                  exchanged for Old Notes in accordance with the Indenture and
                  the Exchange Offer, will be valid and binding obligations of
                  the Company and entitled to the benefits of the Indenture.

         2.       The Indenture is an obligation of the Company.

         3.       Each Subsidiary Guarantee has been duly authorized and, when
                  delivered and exchanged for Old Notes, will be a valid and
                  binding obligation of the respective Subsidiary Guarantor.

         The opinions and other matters in this letter are qualified in their
entirety and subject to the following:

         A.       We express no opinion as to the laws of any jurisdiction other
                  than any published constitutions, treaties, laws, rules or
                  regulations or judicial or administrative decisions ("LAWS")
                  of the State of New York and the Delaware General Corporation
                  Law.

         B.       This law firm is a registered limited liability partnership
                  organized under the laws of the State of Texas.

         C.       The matters expressed in this letter are subject to and
                  qualified and limited by (i) applicable bankruptcy,
                  insolvency, fraudulent transfer and conveyance,
                  reorganization, moratorium and similar laws affecting
                  creditors' rights and remedies generally; (ii) general
                  principles of equity, including principles of commercial
                  reasonableness, good faith and fair dealing (regardless of
                  whether enforcement is sought in a proceeding at law or in
                  equity); (iii) commercial reasonableness and unconscionability
                  and an implied covenant of good faith and fair dealing; (iv)
                  the power of the courts to award damages in lieu of equitable
                  remedies; and (v) securities Laws and public policy underlying
                  such Laws with respect to rights to indemnification and
                  contribution. We express no opinion as to the enforceability
                  of Section 4.06 of the Indenture.



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AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.
AdvancePCS
April 18, 2001
Page 3

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of our name in the Prospectus forming a
part of the Registration Statement under the caption "Legal Matters." In giving
this consent, we do not thereby admit that we are within the category of persons
whose consent is required under Section 7 of the Act and the rules and
regulations thereunder. We also consent to your filing copies of this opinion as
an exhibit to the Registration Statement.

                                    Very truly yours,




                                    AKIN, GUMP, STRAUSS, HAUER & FELD, L.L.P.

Enclosure


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                                    EXHIBIT A

                              SUBSIDIARY GUARANTORS


AdvancePCS, L.P.
AdvancePCS Research, L.L.C.
AdvanceRx.com, L.P.
ADVP Consolidation, L.L.C.
ADVP Management, L.P.
Ambulatory Care Review Services, Inc.
Baumel-Eisner Neuromedical Institute, Inc.
FFI Rx Managed Care, Inc.
First Florida International Holdings, Inc.
HMN Health Services, Inc.
PCS Health Systems, Inc.
PCS Holding Corporation
PCS Mail Services, Inc.
PCS Mail Services of Birmingham, Inc.
PCS Mail Services of Ft. Worth, Inc.
PCS Mail Services of Scottsdale, Inc.
PCS Services, Inc.