Analysis of medication errors at a large tertiary care hospital in Saudi Arabia: a retrospective analysis.

Background Medication errors (MEs) are common in health care settings and pose a threat for the hospitalized population. Therefore, aspects of MEs were explored in a tertiary setting serving a diverse population. Objective To examine the occurrence, severity and reporting of MEs in hospitalized patients. Methods This retrospective analysis included 10,683 ME report forms that were received by the Medication Safety Unit of King Saud Medical City (KSMC) in 2015. ME outcomes were determined according to the National Coordinating Council for Medication Error Reporting and Prevention (NCC MERP) Index for categorizing MEs algorithm. Results A total of 13,677 MEs in 912,500 prescriptions were reported. The incidence rate of MEs was 1.5% (13,677/912,500). The highest percentage (42.2%) of MEs occurred during the transcription stage, and 70.0% of MEs were reported as near misses. Wrong frequency and wrong concentration accounted for nearly half of the MEs. Conclusion We found 1.5 MEs per 100 prescriptions; more than two-thirds of the MEs were preventable and were intercepted before reaching the patients. Most MEs reported by pharmacists occurred at the transcription stage while wrong frequency was the most common error type encountered. Further studies should explore the clinical consequences of MEs at a healthcare institution.