A pharmacist-managed clinic for treating latent tuberculosis infection (LTBI) in health care workers (HCWs) is described. The hospital-based clinic was begun in 1993 after a review showed that only 0.8% of HCWs at the institution who were prescribed isoniazid for LTBI completed it. The goals of the clinic are to improve HCWs' adherence to LTBI treatment, enhance outcomes, and minimize adverse drug reactions. The clinic is staffed by a pharmacist, a medical resident, and a nurse. If an employee is diagnosed with LTBI, he or she is referred to the clinic, where the pharmacist conducts an initial assessment and provides information on medication available for treatment. The worker is then scheduled for monthly follow-up visits with the pharmacist for the first three months of LTBI therapy, during which the pharmacist evaluates treatment adherence and potential adverse effects. Thereafter, the pharmacist interviews the patient monthly by telephone until therapy is complete. HCWs are allowed only a one-month supply of medication with each refill. From June 1993 through June 1997, of 131 employees who started treatment, 122 (93%) completed it. From June 1997 through December 2001, annual therapy completion rates ranged from 90% to 100%. No cases of active tuberculosis have been reported in treated patients, and only nine adverse drug reactions were reported for the 1997-2001 period. A pharmacist-managed clinic substantially improved rates of treatment completion among HCWs with LTBI.