The treatment of arrhythmia varies according to the type of arrhythmia of the patient, and the drugs commonly used in the treatment of arrhythmia in clinic are sodium channel blocker, β-adrenergic receptor antagonist, potassium channel blocker, and calcium channel blocker. 1. Sodium channel blocking drugs, the more common class I sodium channel blocking drugs in the clinic are propafenone. Propafenone belongs to a kind of IC drugs, has strong sodium channel blocking effect, and has better effect in the treatment of supraventricular rhythm and ventricular rhythm. 2. β-adrenergic receptor antagonist drugs, clinically commonly used class II β-adrenergic receptor antagonist drugs are carvacrol and metoprolol. Usually used in the treatment of chronic heart failure combined with ventricular arrhythmia. 3. Potassium channel blocking drugs, representative drugs are sotalol, amiodarone. Patients with arrhythmias treated with sotalol can improve QT dispersion. Amiodarone treatment of elderly patients with ventricular arrhythmia can achieve more obvious efficacy. 4. Calcium channel blocking drugs, adenosine is a common clinical class IV calcium channel blocking drugs, can act on the G protein-coupled adenosine receptor, can inhibit the L-type calcium channel, effectively prolonging the atrioventricular node effective response time, applicable to patients with paroxysmal supraventricular tachycardia, can help the patient to restore sinus rhythm. The above four types of drugs are commonly used in the clinical treatment of arrhythmia, it is not recommended that patients buy and take on their own, so as not to cause serious adverse consequences, should be purchased and taken under the guidance of a professional doctor.