Flecainide acetate is primarily used as an antiarrhythmic medication to treat and manage irregular heartbeats, specifically certain types of ventricular and supraventricular arrhythmias. It works by stabilizing the heart's electrical activity, helping to restore and maintain a normal heart rhythm. This medication is often prescribed for conditions such as paroxysmal atrial fibrillation, paroxysmal supraventricular tachycardia, and life-threatening ventricular arrhythmias. It is particularly effective in patients without structural heart disease. Flecainide acetate is typically administered orally in tablet form, and its dosage is carefully adjusted based on the patient's response and tolerance. Regular monitoring of heart function and blood levels is essential to minimize the risk of adverse effects, including proarrhythmia. It is not suitable for patients with severe heart conditions like recent myocardial infarction or significant heart failure.