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ContextIatrogenic injuries, including medication errors, are an important problem in all hospitalized populations. However, few epidemiological data are available regarding medication errors in the pediatric inpatient setting.ObjectivesTo assess the rates of medication errors, adverse drug events (ADEs), and potential ADEs; to compare pediatric rates with previously reported adult rates; to analyze the major types of errors; and to evaluate the potential impact of prevention strategies.Design, Setting, and PatientsProspective cohort study of 1120 patients admitted to 2 academic institutions during 6 weeks in April and May of 1999.Main Outcome MeasuresMedication errors, potential ADEs, and ADEs were identified by clinical staff reports and review of medication order sheets, medication administration records, and patient charts.ResultsWe reviewed 10 778 medication orders and found 616 medication errors (5.7 …