The main ingredient of cardioplegia tablets is total alkaloids of bitter ginseng, which belongs to anti-arrhythmic drugs, and is commonly used in the treatment of arrhythmia and premature ventricular contractions in clinic. If the therapeutic effect of cardioplegia tablets is not obvious enough, or if the patients are intolerant, they can choose propranolol hydrochloride tablets, metoprolol tartrate tablets, and propafenone hydrochloride as the substitutes. 1. Propranolol hydrochloride: also known as cardioplegia, can slow down the heart rate, inhibit cardiac contractility and conduction, so that the myocardial oxygen consumption is reduced, mainly used in the treatment of a variety of causes of cardiac arrhythmia, the common adverse effects of tinnitus, loss of appetite, etc., patients with bronchial asthma is prohibited. 2. Metoprolol tartrate tablets: can slow down the heart rate, reduce myocardial contractility, used in the treatment of hypertension, arrhythmia, etc., common adverse reactions include fatigue, headache, dizziness, cardiogenic shock, heart failure patients are prohibited. 3. Propafenone Hydrochloride Tablets: also known as cardioplegia, belongs to the broad-spectrum anti-arrhythmic drugs, can reduce myocardial excitation, slow down the heart rate, reduce cardiac output, used in the treatment of cardiac arrhythmia, common adverse reactions are dry mouth, tongue and lip numbness, etc., allergic to the product is prohibited, cardiogenic shock patients are prohibited. There are many alternatives to cardiac rhythm tablets, specifically under the formal guidance of the doctor.