<prompt> Which of the following drug causes QT prolongation?LoratidineLevocetrizineFexofenadineFinasteride  <response>: ANSWER: C FexofenadineREF: KDT 6th edition page 510, Harrison 18th edition page 1884 Table 233-5Drugs causing QT prolongation: Potential to precipitate Torsades de pointes Antiarrthymic: Amidarone, Disopyamide, Dofetilde, Dronedarone, Ibutilite, Sotalol, Quinidine, procainamide, Propafenone Antibiotics: Quinine, Gatifloxacin, sparfloxacin, Halofantrin, Voriconazole, artemisin Prokinetic drugs: Cisapride Antidepressants: Tricyclic antidepressants Antihistaminics: Terfenadine, astemiazole, ebastine, Fexofenadine Anesthetics: Bupivacine SSRIs especially xvith Citalopram Antipsychotics: Thioridazone, risperidone 