Class 3 antiarrhythmic drugs is
Refer kDT 6/e p 511 Class III agents have the potential to prolong the QT interval of the EKG, and may be proarrhythmic (more associated with development of polymorphic VT). Class III agents include: bretylium, amiodarone, ibutilide, sotalol, dofetilide, vernakalant and dronedarone
Amiodarone
Phenytoin
Propafenone
Pindolol
Cardiovascular system