Antiarrhythmic drugs are medications used to treat irregular heartbeats, known as arrhythmias. These drugs work by modifying the electrical signals in the heart, helping to restore a normal rhythm. They can be classified into different categories based on their mechanism of action, such as sodium channel blockers, beta-blockers, and potassium channel blockers. These medications are often prescribed for conditions like atrial fibrillation or ventricular tachycardia. While they can be effective in managing heart rhythm issues, they may also have side effects and require careful monitoring by healthcare professionals to ensure safety and effectiveness.