To explore these issues, the Forum on Drug Discovery, Development, and Translation conducted a public workshop entitled Understanding the Benefits and Risks of Pharmaceuticals, with the broad goals of gaining a better understanding of the current system used to evaluate benefit and risk, and to identify opportunities for improvement. This workshop was held in Washington, D.C., on May 30-31, 2006. The benefit-risk profiles of pharmaceuticals are constantly evolving as new data are collected throughout the life cycle of a drug. Discussions during the workshop focused on the following: (1) premarket assessment, during which clinical trial data are used to assess benefit and risk; (2) communication of that information to prescribing physicians and their patients; (3) healthcare decisions made by prescribing physicians and their patients; and (4) the accumulation of benefit-risk information from postmarketing experience, which feeds back into the other phases. Understanding the Benefits and Risks of Pharmaceuticals: Workshop Summary explains in detail the discussions during this workshop.