Pirmenol hydrochloride is primarily used as an antiarrhythmic agent in the treatment of cardiac arrhythmias. It works by stabilizing the heart's electrical activity, helping to restore and maintain a normal heart rhythm. This makes it particularly useful in managing conditions such as atrial fibrillation, ventricular tachycardia, and other irregular heartbeats. It is often administered in clinical settings under medical supervision to ensure proper dosing and monitoring of its effects on the heart. Due to its mechanism of action, it is considered effective in reducing the risk of sudden cardiac events in patients with arrhythmias.