Cardioplegia is the trade name and generic name for Propafenone Hydrochloride Tablets, a drug used in the treatment of paroxysmal ventricular tachycardia and supraventricular tachycardia. Propafenone Hydrochloride Tablets is a broad-spectrum and highly effective membrane inhibitory antiarrhythmic drug with competitive beta-blocking effect and membrane stabilizing effect. It can reduce myocardial excitability, prolong the action potential time course and effective response period, and prolong conduction. Adverse reactions such as dry mouth and numbness of lips and tongue may occur after use of the drug, which can be gradually relieved after stopping the drug. Children, pregnant women safety is not yet clear, myocardial severe damage, patients should be cautious with the drug. Discontinue use of this drug in lactating women. The use of this drug is contraindicated in patients who are allergic to this drug or the components of the formula, patients with double bundle branch conduction block, severe congestive heart failure, cardiogenic shock, severe hypotension. The specific dosage and usage of the above medicines should follow the doctor’s instructions, and should not be used on their own to avoid adverse reactions.