Detection of Medication Errors Through Medication History Assessment During Admission at General Medical Wards

Introduction: Medication history assessment during hospital admissions is an important element in the medication reconciliation process. It ensures continuity of care and reduces medication errors. Objectives: This study aimed to determine the incidence of unintentional discrepancies (medication errors), types of medication errors with its potential severity of patient harm and acceptance rate of pharmaceutical care interventions. Methods: A four-month cross-sectional study was conducted in the general medical wards of a tertiary hospital. All newly admitted patients with at least one prescription medication were recruited via purposive sampling. Medication history assessments were done by clinical pharmacists within 24 hours or as soon as possible after admission. Pharmacist-acquired medication histories were then compared with in-patient medication charts to detect discrepancies. Verification of the discrepancies, interventions, and assessment of the potential severity of patient harm resulting from medication errors were collaboratively carried out with the treating doctors. Results: There were 990 medication discrepancies detected among 390 patients recruited in this study. One hundred and thirty-five (13.6%) medication errors were detected in 93 (23.8%) patients (1.45 errors per patient). These were mostly contributed by medication omissions (79.3%), followed by dosing errors (9.6%). Among these errors, 88.2% were considered "significant" or "serious" but none were "life-threatening." Most (83%) of the pharmaceutical interventions were accepted by the doctors. Conclusion: Medication history assessment by pharmacists proved vital in detecting medication errors, mostly medication omissions. Majority of the errors intervened by pharmacists were accepted by the doctors which prevented potential significant or serious patient harm.