Propafenone is primarily used as an antiarrhythmic medication to treat and manage irregular heartbeats, such as atrial fibrillation, atrial flutter, and ventricular tachycardia. It works by stabilizing the heart's electrical activity, helping to restore and maintain a normal rhythm. This makes it particularly valuable for patients with symptomatic arrhythmias that significantly impact their quality of life or pose a risk to their health. It is often prescribed when other treatments have been ineffective or are not suitable. Additionally, propafenone is sometimes used in the acute setting to quickly convert certain types of arrhythmias to a normal rhythm. Due to its potential side effects, such as exacerbating arrhythmias in some cases, its use is carefully monitored, and it is typically prescribed under the guidance of a cardiologist.