A medication error is generally defined as a deviation from the physician's medication order as written on the patient's chart. In hospitals, medication errors occur at a rate of about one per patient per day. A dispensing error is one made by pharmacy staff when distributing medications to nursing units or directly to patients in an ambulatory-care pharmacy; the error rates for doses dispensed via the cart-filling process range from 0.87% to 2.9%. Categories of medication errors should be operationally defined before an investigation, and any allowable deviations from the physician's order should be clearly stated. Fourteen error category definitions are presented. Methods for detecting medication errors include anonymous self-reports (questionnaires), incident reports, the critical-incident technique (analyses of a large number of individual errors to identify common causal factors), and direct observation (including the disguised-observation and participant observer techniques). Observation is the best error detection method in terms of accuracy.

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