Adverse Drug Events: The Magnitude of Health Risk Is Uncertain Because of Limited Incidence Data

Pursuant to a congressional request, GAO summarized from available research what is known about adverse drug events (ADE), focusing on the: (1) different types and causes of ADEs; (2) evidence on the overall incidence and cost of ADEs in the United States; and (3) measures that have been proposed to reduce the number and severity of ADEs.