Encainide
Encyclopedia
Encainide is a class Ic antiarrhythmic agent
Antiarrhythmic agent
Antiarrhythmic agents are a group of pharmaceuticals that are used to suppress abnormal rhythms of the heart , such as atrial fibrillation, atrial flutter, ventricular tachycardia, and ventricular fibrillation....

. It is no longer used because its frequent proarrhythmic side effects.
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