clozapine, pimozide, (used to treat abnormal thoughts or feelings); meperidine, piroxicam, propoxyphene (used to relieve pain); cisapride (used to relieve certain stomach problems); rifabutin (used to prevent/treat certain infections)*; voriconazole (used to treat fungal infections)*; simvastatin, lovastatin (used to lower blood cholesterol); alfuzosin (used to treat enlarged prostate gland); fusidic acid (used to treat bacterial infections); rifampicin co-administered with saquinavir (used to treat co-infections with HIV and tuberculosis);