Fluvoxamine, ciprofloxacin, antiarrhythmics (eg, amiodarone, mexiletine, propafenone), cimetidine, fluoroquinolones (enoxacin, pefloxacin, norfloxacin), rofecoxib, OC, ticlopidine; drugs which may prolong QT interval (eg, cisapride, amitriptyline, azithromycin); antihypertensives, including diuretics; rifampicin; alcohol; hypnotic sedative drugs (eg, benzodiazepine or baclofen), other antihistamines, α-2 adrenergic agonists (ie, clonidine).