- Use of medications known to increase risk of torsades de pointes, including Amiodarone; Arsenic trioxide; Astemizole; Azithromycin; Bepridil; Chloroquine; Chlorpromazine; Cisapride; Citalopram; Clarithromycin; Disopyramide; Dofetilide; Domperidone; Droperidol; Erythromycin; Flecainide; Halofantrine; Haloperidol; Ibutilide; Levomethadyl; Mesoridazine; Methadone; Moxifloxacin; Pentamidine; Pimozide; Probucol; Procainamide; Quinidine; Sotalol; Sparfloxacin; Terfenadine; Thioridazine; Vandetanib