Pharmacology The antiarrhythmic drug which decreases both rate of depolarization (phase 0) as well as rate of repolarization of myocardial fibres is A Verapamil B Quinidine C Propranolol D Lignocaine 💡 Explanation The antiarrhythmic drug which decreases both rate of depolarization (phase 0) as well as rate of repolarization of myocardial fibres is ✓ Correct Answer: B. Quinidine