Patients with arrhythmia often need to take antiarrhythmic drugs. The commonly used antiarrhythmic drugs mainly include four categories. The first category is sodium channel blockers, including propafenone, quinidine, flucarnil, and encarnil. The second type is beta blockers, including metoprolol, bisoprolol, etc. The third type of antiarrhythmic drugs are potassium channel blockers, including amiodarone, ibutilide, Dofelide, etc., as well as sotalol. The fourth type is calcium antagonists, including verapamil, diltiazem, etc. In addition, some Chinese patent medicines, such as Wenxin Granules, also have some antiarrhythmic effects.