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Ia Mechanism
Sodium and potassium channel blockers
Ia Drugs
Includes quinidine, procainamide, and disopyramide
Ib Mechanism
Sodium channel blockers
Ib Drugs
Includes lidocaine and mexiletine
Ic Mechanism
Sodium channel blockers
Ic Drugs
Includes flecainide and propafenone
II Mechanism
Beta blockers
II Drugs
Includes atenolol and metoprolol
III Mechanism
Potassium channel blockers
III Drugs
Includes aminodarone, dofetilide, dronedarone, sotalol, and ibutilide
IV Mechanism
Calcium channel blockers
IV Drugs
Includes verapamil and diltiazem