- Have received alpha tocopherol (vitamin E), amiodarone, astemizole, carbamazepine, cisapride, ergotamine/diergotamine, estrogens, fluvastatin, glucocorticoids, itraconazole, ketoconazole, midazolam, phenobarbital, phenytoin, quinidine, rifampin, rifabutin, sildenafil, statin drugs (simvastatin, pravastatin, atorvastatin) used for reduction of triglyceride or cholesterol levels, terfenadine, triazolam, or warfarin within 14 days of study entry.