<prompt> Drug of choice for paroxysmal supraventricular tachycardia is:VerapamilDiltiazemDigoxinPhenytoin  <response>: 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. 