Effect of clinical pharmacists on drug prescribing in a primary-care clinic.

The effect of clinical pharmacy services on prescribing patterns and drug costs for nonsteroidal anti-inflammatory drugs (NSAIDs) and salicylates in a primary-care clinic operated by a health-maintenance organization (HMO) was studied. Two pharmacists provided clinical services to a randomly selected cluster of family practice physicians in the HMO for six months. A second family practice cluster served as a control group. The pharmacists alerted prescribers to the availability of low-cost alternatives (such as ibuprofen and salicylates) and reviewed the medication profiles of patients receiving high-cost NSAIDs. Data were collected for both physician clusters for nine months before and six months after the pharmacists' intervention. Changes in the mean numbers of prescriptions for ibuprofen and piroxicam per 1000 enrollees per physician in the baseline and evaluation periods were not significantly different between the two groups. Significantly more prescriptions for salicylates were written by physicians in the intervention group than in the control group during the evaluation period. Annualized mean drug ingredient costs per enrollee and per prescription for NSAIDS and salicylates decreased during the evaluation period in both groups, but these differences were not significant. In relatively unstructured interactions with physicians and nurses, clinical pharmacists were not able to reduce the costs associated with NSAIDs but did have a modest effect on altering salicylate prescribing patterns. This clinical pharmacy program was not economically self-sustaining during the first six months of operation, since operating costs exceeded anticipated savings.