The extent and nature of pharmacists' involvement in family practice medical residency training programs was assessed using a national survey. Department chairmen of all 386 approved family practice residency training programs in the United States were contacted and asked to provide the names and addresses of pharmacists in charge of pharmaceutical services in the centers. A 46-item, six-page questionnaire was mailed to each pharmacist with a follow-up mailing, then a telephone call, to nonresponders. Department chairmen of 68 (18%) of the programs reported having at least one pharmacist in the center. Responses to the questionnaire were obtained from 53 (78%) of the pharmacists, four of whom were no longer involved with family practice centers. Most of the remaining 49 pharmacists were men (76%) between 30 and 40 years old (59%) with an academic appointment (67%) and a doctor of pharmacy degree or some type of postgraduate training. Drug-distribution services were provided in 37% of the centers. All pharmacies offered clinical services. Almost all pharmacies (92%) offered educational services to both medical and nursing staffs, and pharmacists in 74% of the centers were involved in research. Few family practice medical residency training centers have pharmaceutical services conducted by a pharmacist; centers with pharmacists have a wide variety of distributive and clinical services.