0000885721-99-000061 Sample Contracts

EXHIBIT 5

Lock-Up Agreement • October 22nd, 1999 • Express Scripts Inc • Services-specialty outpatient facilities, nec

• Contract Type
  Lock-Up Agreement
• Filed
  October 22nd, 1999
• Company
  Express Scripts Inc
• Industry
  Services-specialty outpatient facilities, nec

Goldman, Sachs & Co. BancBoston Robertson Stephens, Inc. Hambrecht & Quist LLC William Blair & Company c/o Goldman, Sachs & Co. 85 Broad Street New York, NY 10004

EXHIBIT 4 AMENDMENT OF AMENDED AND RESTATED INVESTORS' RIGHTS AGREEMENT

Investors' Rights Agreement • October 22nd, 1999 • Express Scripts Inc • Services-specialty outpatient facilities, nec • California

• Contract Type
  Investors' Rights Agreement
• Filed
  October 22nd, 1999
• Company
  Express Scripts Inc
• Industry
  Services-specialty outpatient facilities, nec
• Jurisdiction
  California

Agreement Regarding Joint Filing and Power of Attorney

Joint Filing Agreement • October 22nd, 1999 • Express Scripts Inc • Services-specialty outpatient facilities, nec

• Contract Type
  Joint Filing Agreement
• Filed
  October 22nd, 1999
• Company
  Express Scripts Inc
• Industry
  Services-specialty outpatient facilities, nec

The 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.