Treatment of mice for 12 weeks with clofazimine or kanamycin decreased the number of organisms from lungs, liver and spleen of mice infected with Mycobacterium intracellulare N-260, compared with findings seen with rifabutin or ethambutol. Treatment with various drug combinations (rifabutin-ethambutol, rifabutin-clofazimine, rifabutin-kanamycin, rifabutin-ethambutol-clofazimine, rifabutin-ethambutol-kanamycin, and rifabutin-clofazimine-kanamycin), particularly in the presence of clofazimine, enhanced elimination of the organisms from these organs.