Used primarily as an antiarrhythmic agent in the treatment of cardiac rhythm disorders. It helps stabilize abnormal electrical activity in the heart, particularly in cases of supraventricular and ventricular arrhythmias. Its mechanism involves blocking sodium channels, which slows conduction in cardiac tissue and helps restore normal sinus rhythm. Due to its pharmacokinetic profile, it can be administered orally for long-term management of arrhythmias. Monitoring is required due to potential proarrhythmic effects, especially in patients with structural heart disease.