<prompt> Drug used for atrial fibrillation and atrial flutter isVerapamilDigitalisQuinidineDiphenylhydantoin  <response>: For AF, digoxin can be used- it decreases ventricular rate in AF Verapamil decreases conduction velocity and increases the refractory period of the AV node and so used in PSVT. REF.Essentials of Pharmacology KD Tripathi 8th ed. 