William L. Greene, PharmD

After cimetidine was releasedin the late 1970s,case reports of clinicallysignificant drug interactionsquickly emerged.1-3Controlled trials soon validated theseinitial clinical observations. Since1983, when a comprehensive reviewof cimetidine drug interactions waspublished,4 more interactions havebeen reported, as use of this agenthas increased because of cost constraintsand the rapid growth of managedcare. Examples of well-documentedinteractions are listed in theTable.