Effect of pharmacists' clinical interventions on nonformulary drug use.

The effect on drug costs of pharmacists' interventions in reducing the use of nonformulary medications was studied in a private teaching hospital. During a four-month period, nonformulary medication request forms and pharmacist consultation logs were reviewed to determine physicians' actions taken on requests for nonformulary medications. Cost avoidance of interventions (nonformulary medication cost) and the cost of pharmacist cost) and the cost of pharmacist time for the interventions were determined. The pharmacist was able to contact The pharmacist was able to contact the physician in 388 of 394 instances in which the use of a nonformulary medication was considered. Of 230 recommendations by pharmacists to change a nonformulary drug order to one for a formulary alternative, 64.8% (149) were accepted by physicians. Of pharmacists' recommendations that were accepted, 75.8% (113/149) were from decentralized areas, which was a significantly higher acceptance rate than that for the centralized areas (24.7% or 36/149). Cost avoidance resulting from acceptance of pharmacists' recommendations during the four-month study was $2,645, or $13,573 per year; this was more than the cost of pharmacist time required to perform interventions. Pharmacist interventions to decrease use of nonformulary drugs can be cost-effective and appear to be more successful in decentralized pharmacy service areas than in areas served by a central pharmacy.