RT Book, Section A1 Gruenberg, Katherine A1 Guglielmo, B. Joseph A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. A2 McQuaid, Kenneth R. SR Print(0) ID 1193122152 T1 Sulfones T2 Current Medical Diagnosis & Treatment 2023 YR 2023 FD 2023 PB McGraw-Hill Education PP New York, NY SN 9781264687343 LK accessmedicine.mhmedical.com/content.aspx?aid=1193122152 RD 2024/04/25 AB A number of medications closely related to the sulfonamides (eg, dapsone) have been used effectively in the long-term treatment of leprosy. The clinical manifestations of both lepromatous and tuberculoid leprosy can often be suppressed by treatment extending over several years. At least 5–30% of Mycobacterium leprae organisms are resistant to dapsone, so initial three-drug treatment with rifampin, dapsone, and clofazimine is advocated. Dapsone, 100 mg daily, is effective therapy for mild to moderate Pneumocystis pneumonia in AIDS when combined with trimethoprim, 15 mg/kg/day in three divided doses. At a dose of 50–100 mg daily or 100 mg two or three times a week, it is effective prophylaxis for P jirovecii infection and, when combined with pyrimethamine, 50 mg per week, also prevents Toxoplasma encephalitis in patients living with HIV.