Antiarrhythmic Drugs and Associated Arrhythmias.
Class I: Fast sodium (Na) channel blockers: Ia - Quinidine, procainamide, disopyramide (depress phase 0, prolonging repolarization) Ib - Lidocaine, phenytoin, mexiletine (depress phase 0 selectively in abnormal/ischemic tissue, shorten repolarization) Ic - Flecainide, propafenone, moricizine (markedly depress phase 0, minimal effect on repolarization)