Used as an antiarrhythmic agent in the treatment of cardiac arrhythmias, particularly ventricular tachyarrhythmias. It works by blocking sodium and potassium channels in cardiac tissue, helping to stabilize the heart's electrical activity. Due to its pharmacokinetic profile and potential for proarrhythmic effects, it is typically reserved for patients who do not respond to or cannot tolerate other antiarrhythmic drugs. Its use requires careful monitoring in a clinical setting.