Antiarrhythmic agents are medications used to treat abnormal heart rhythms, known as arrhythmias. They work by either stabilizing the heart’s electrical system or altering the heart’s rhythm. These medications are classified into different classes based on their mechanisms of action, such as sodium channel blockers, beta blockers, potassium channel blockers, and calcium channel blockers. They are prescribed based on the type and severity of the arrhythmia and may require careful monitoring due to potential side effects and interactions.