Propafenone HCl is primarily used as an antiarrhythmic medication to treat certain types of 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 heart rhythm. This makes it particularly valuable for patients who experience recurrent or persistent arrhythmias that can lead to serious complications like stroke or heart failure. It is often prescribed when other treatments have not been effective, and its use is carefully monitored due to potential side effects, including dizziness, blurred vision, and gastrointestinal disturbances. Additionally, it may be used in combination with other therapies to enhance its effectiveness in managing complex cardiac conditions.