- Amiodarone, astemizole, bepridil, bupropion, cisapride, clozapine, dihydroergotamine, encainide, ergotamine, flecainide, meperidine, pimozide, piroxicam, propafenone, propoxyphene, quinidine, terfenadine, alprazolam, clorazepate, diazepam, estazolam, flurazepam, midazolam, triazolam, zolpidem, phenytoin, phenobarbital, and carbamazepine.