Propafenone, commonly known as propafenone hydrochloride, belongs to the class IC antiarrhythmic drugs and works mainly by blocking fast sodium channel antagonists. Propafenone hydrochloride is commonly used as tablets and injections, and is clinically used for paroxysmal ventricular tachycardia and supraventricular tachycardia, and is also effective in atrial flutter and atrial fibrillation. Adverse effects such as dry mouth, numbness of lips and mouth, headache, dizziness, nausea, vomiting, constipation, etc. may occur during the course of the drug, and liver function impairment may occur in some people. Cardiac muscle damage should be used with caution, severe bradycardia and obvious hypotension should be used with caution, severe hepatic and renal function abnormalities should be used with caution; abnormal sinus node function, severe atrioventricular block, severe congestive heart failure, cardiogenic shock, severe electrolyte disorders, severe obstructive respiratory disease, severe myasthenia gravis, severe hypotension, as well as allergy to the product is contraindicated. The drug should be used under the supervision of a physician, and after the use of the drug in the event of significant cardiac rhythm abnormalities, blood pressure drop, systemic allergic reactions should be promptly discontinued the drug, and actively seek medical attention.