Pharmacology Hypeension, Arrhythmias, Dyslipidemia 63389675 QT prolongation is caused by:- A Quinidine B Omeprazole C Lidocaine D Penicillin High-Yield Explanation Drugs causing QT prolongation are: Cisapride Astemizole Terfanidine Class 1A anti-arrythmic drugs: Quinidine, Procainamide. Class 3 anti-arrythmic drugs: Bretylium, Ibutilide