Classification of antiarrhythmic drugs (Vaughan & Williams)

Class I – sodium channel blocker
Ia: Procainamide, quinidine, disopyramide, moricizine (PQDM)
Ib: Lignocaine, mexilitine, phenytoin (LMP)
Ic: Propafenone, Flecainide (PF)
Class II: Beta Blockers (BB) e.g. metoprolol, propanolol, esmolol, sotalol
Class III: K channel blockers e.g. amiodarone, bretylium, dofetilide (BAD)
Class IV: Calcium channel blockers (CCB) e.g. verapamil