EXHIBIT 4 AMENDMENT OF AMENDED AND RESTATED INVESTORS' RIGHTS AGREEMENTInvestors' Rights Agreement • October 22nd, 1999 • Express Scripts Inc • Services-specialty outpatient facilities, nec • California
Contract Type FiledOctober 22nd, 1999 Company Industry Jurisdiction
EXHIBIT 5Express Scripts Inc • October 22nd, 1999 • Services-specialty outpatient facilities, nec
Company FiledOctober 22nd, 1999 IndustryGoldman, Sachs & Co. BancBoston Robertson Stephens, Inc. Hambrecht & Quist LLC William Blair & Company c/o Goldman, Sachs & Co. 85 Broad Street New York, NY 10004
Agreement Regarding Joint Filing and Power of AttorneyExpress Scripts Inc • October 22nd, 1999 • Services-specialty outpatient facilities, nec
Company FiledOctober 22nd, 1999 IndustryThe undersigned, for good and valuable consideration, hereby agree that they shall jointly file an acquisition statement under Section 13(d) of the Securities Exchange Act of 1934, as amended, with respect to the acquisition by the undersigned of shares of common stock of PlanetRx.com, Inc., a Delaware corporation, and that they shall cooperate with each other regarding the filing, and when appropriate, amending of such acquisition statement.