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Antiarrhythmic drug classifications deal with the
mechanism of
action of the drug. Class IA are sodium and potassium blocking agents (e.g. quinidin, procainamide, disopyramide), IB - primarly sodium channel blocking (e.g. lidocaine, mexiletine) IC - sodium, potassium and beta-blockade (e.g. propafenone, flecanide) II - beta blockers, III - potassium channel and beta-blockade (e.g. sotalol, amiodarone) IV - calcium channel blockers (e.g.