Disopyramide is primarily used as an antiarrhythmic medication to treat abnormal heart rhythms, particularly ventricular arrhythmias. It works by stabilizing the heart's electrical activity, helping to maintain a regular heartbeat. This makes it effective in managing conditions like atrial fibrillation, ventricular tachycardia, and other arrhythmias that can lead to serious complications if left untreated. Additionally, it is sometimes prescribed to prevent recurrent episodes of arrhythmias in patients with a history of such issues. Due to its potential side effects, such as anticholinergic effects and negative inotropic effects, it is often used when other antiarrhythmic drugs are not suitable or effective. Regular monitoring of heart function and patient response is essential during treatment.