Cibenzoline is primarily used as an antiarrhythmic agent to treat and manage irregular heartbeats, specifically ventricular and supraventricular arrhythmias. It works by stabilizing the heart's electrical activity, helping to restore and maintain a normal rhythm. This makes it effective in preventing episodes of tachycardia and other rhythm disorders. Additionally, cibenzoline is sometimes employed in cases where other antiarrhythmic medications have proven ineffective. Its use requires careful monitoring due to potential side effects, such as changes in blood pressure or heart function. It is typically prescribed under medical supervision to ensure safe and effective treatment.