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                                                                    EXHIBIT 23.3


               Consent of Ernst & Young LLP, Independent Auditors

We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of AdvancePCS (formerly
Advance Paradigm, Inc.) for the registration of $200,000,000 of senior
subordinated notes and Class A common stock purchase warrants for 780,000
shares, and to the incorporation by reference therein of our reports dated
January 14, 1999 and April 21, 2000 (except Note 12 to the April 21, 2000
report, as to which the date is June 15, 2000), with respect to the consolidated
financial statements of PCS Holding Corporation and Subsidiaries included in
Advance Paradigm, Inc.'s Form 8-K/A dated October 26, 2000, filed with the
Securities and Exchange Commission.


                                   /s/ Ernst & Young LLP

Phoenix, Arizona
December 13, 2000