Table 1 Breakdown of MERP categories for 3,861 PSE reports. Each report could be grouped into zero, one, or multiple categories.

From: A text mining approach to categorize patient safety event reports by medication error type

MERP categories

Definition

Number of reports

Coding taxonomy and definitions21

Wrong drug

Ordered, dispensed, or administered a medication different from what was intended or gave a drug when no drug was intended

1982

Wrong time

Administration outside a predefined time interval from its scheduled administration time, as defined by each health care facility

1677

Wrong strength or concentration

Incorrect medication strength/concentration was ordered, dispensed, or administered

1453

Wrong dosage form or technique or route

Combined from wrong dosage form, wrong technique, and wrong route of administration

1107

Improper dose/dose omission

Failure to order, dispense, or administer a dose as intended. Includes an overdose, underdose, extradose, or duplicate therapy due in some part to an incorrect duration, strength/concentration, dosage form, rate, time, or frequency

1102

Wrong rate

Medication administered too fast or slow

323

Wrong patient

Medication was ordered, dispensed, or administered to patient different from what was intended

152

Monitoring error

Drug-drug interactions or drug allergy issues that were not identified

144