Cibenzoline Products | Cleanchem - Cibenzoline is an antiarrhythmic agent used in the treatment of various cardiac arrhythmias, especially atrial fibrillation and ventricular tachycardia. It works by blocking sodium channels, thereby stabilizing cardiac electrical activity. It may also exhibit weak anticholinergic effects. Side effects include dizziness, blurred vision, and potential cardiac conduction abnormalities.