Used primarily as an antiarrhythmic agent to treat certain types of irregular heartbeats, such as ventricular tachycardia and symptomatic premature ventricular contractions. It helps stabilize the heart's electrical activity by blocking sodium channels in cardiac tissue, which slows down conduction and prolongs the action potential. Also used in the management of supraventricular arrhythmias in specific cases. Due to its anticholinergic effects, it may be less preferred in patients with conditions like glaucoma or urinary retention. Often reserved for patients who do not respond to or cannot tolerate other antiarrhythmic drugs.