Drug of choice for paroxysmal supraventricular tachycardia is:: (A) Verapamil, (B) Diltiazem, (C) Digoxin, (D) Phenytoin
Answer is A. Verapamil decreases conduction velocity and increases the refractory period of the AV node, thus useful in PSVT. It is a CCB, Class 4 antiarrhythmic drug Adenosine and magnesium sulfate can also be used for PSVT REF: Essentials of Pharmacology KD Tripathi 8th ed.