Impact of computerized drug profiles and a consulting pharmacist on outpatient prescribing patterns: a clinical trial

Abstract

The effects of computerized drug profiles and clinical pharmacist consultation in the internal medicine clinics at a Veterans Administration hospital were studied. Population included patients (n = 512) and physicians (n = 35) of three internal medicine clinics during an eight-week period. The first four weeks were the preintervention period. The second four weeks were the intervention period in which a clinical pharmacist attended one clinic (A) and provided drug profiles on all patients. Two other clinics (B and C) served as controls. During the intervention, patients in clinic A experienced a significant reduction in prescribing problems as identified by the pharmacist: 49 percent of patients before the intervention versus 9.4 percent after the intervention (p less than 0.001). Patients in clinic B had no significant change in prevalence in the number of problems identified (39 versus 40 percent; NS), and patients in clinic C had a significant but less dramatic decrease (35 versus 22 percent; p less than 0.05). The proportion of patients in clinic A with net decrease in the number of prescribed medications rose from 7.1 to 34.9 percent (p less than 0.001), with a mean decrease of 0.3 medications per patient. No significant differences in number of prescribed medications were noted in clinics B or C. Accuracy of physician medication charting improved for patients in clinic A from 54 percent of charts with accurate drug lists before the intervention to 78.3 percent after the intervention (p less than 0.001). No significant improvements were noted for clinics B and C. These results suggest that computerized drug profiles together with clinical pharmacist consultation can improve prescribing practices in a hospital outpatient department.