- amiodarone, astemizole, bepridil, bupropion, cisapride, clozapine, encainide, flecainide, meperidine, piroxicam, propafenone, propoxyphene, quinidine, rifabutin, terfenadine, alprazolam, clorazepate, diazepam, estazolam, flurazepam, midazolam, triazolam, and zolpidem.