Disopyramide phosphate salt is primarily used as an antiarrhythmic medication to treat irregular heartbeats, specifically ventricular and supraventricular arrhythmias. It works by stabilizing the heart's electrical activity, helping to maintain a normal rhythm. This compound is often prescribed for patients with conditions like atrial fibrillation or ventricular tachycardia. It is also used in cases where other antiarrhythmic drugs are ineffective or contraindicated. Additionally, it may be employed in the management of hypertrophic cardiomyopathy to reduce symptoms and improve cardiac function. Proper dosage and monitoring are essential to avoid potential side effects such as heart failure or anticholinergic effects.