- Amiodarone, astemizole, bepridil, cisapride, cholestyramine, ergot and ergot derivatives, flecainide, ganciclovir, interferon alfa, midazolam (unless used for sedation on ACTG 723), pimozide, propafenone, propoxyphene, quinidine, ribavirin, rifampin, sucralfate, terfenadine, and triazolam.