Background: Clinical pharmacists have a vital role in intercepting prescribing errors (PEs) but their impact within a Jordanian hospital emergency department (ED) has never been studied. Objective: To evaluate the impact of clinical pharmacy services on PEs and assess predictors of physicians’ acceptance of clinical pharmacists’ interventions. Setting: This study was conducted in the ED of the largest governmental hospital in Jordan. Method: This was a pre-post study conducted in October and November 2019 using a disguised observational method. There were 2 phases: control phase (P0) with no clinical interventions, and active phase (P1) where clinical pharmacists prospectively intervened upon errors. The clinical significance of errors was determined by a multidisciplinary committee. The SPSS software version 24 was used for data analysis. Main Outcome Measure: PEs incidence, type, severity, and predictors for physicians’ acceptance. Results: Of 18003 patients, 8732 were included in P0 and 9271 in P1. PEs incidence decreased from 24.6% to 5.4%. Contraindication, drug selection, and dosage form error types were significantly reduced from 32.6%, 9.1%, and 3.7% (P0) to 12.6%, 0.0%, and 0.0% (P1), respectively. Albeit not statistically significant, drug-drug interaction, drug frequency, and allergy error types were reduced from 4.9%, 3.1%, and 0.1% to 4.5%, 2.5%, and 0.0%, respectively. Significant and serious errors were significantly reduced from 68.7% and 3.0% (P0) to 8.9% and 1.8% (P1), respectively. During P1, most errors were minor (89.3%, 1574/1763), and lethal errors ceased. Predictors for physicians’ acceptance were: significant errors (OR 3.1; 95% CI 2.6-4.3; P = 0.03) and non-busy physicians (OR 2.1; 95% CI 1.6-2.7; P = 0.04). Conclusion: Clinical pharmacists significantly reduced PEs in the ED by 76%; most of interventions were significant. Policymakers are advised to implement active clinical pharmacy in the ED.
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