The preferred drugs for arrhythmia can be broadly categorized into slow-type arrhythmia applying isoprenaline, atropine, etc.; fast-type arrhythmia applying amiodarone, propafenone, metoprolol, etc., in accordance with doctor’s prescription. 1. Slow-type arrhythmia: common causes include sick sinus node syndrome, atrioventricular block, etc. The first choice of drugs can be salbutamol, isoproterenol, atropine, etc. If the condition is serious and dizziness, fainting, black haze, etc. occurs, it may be necessary to install a pacemaker for treatment. 2. Tachyarrhythmia: If sinus tachycardia or atrial tachycardia occurs, the first choice of medicine is metoprolol and bisoprolol; supraventricular tachycardia, the first choice of medicine is propafenone; ventricular tachycardia, the first choice of medicine is amiodarone; atrial fibrillation is the first choice of medicine is metoprolol and digoxin for the control of ventricular rate, and the first choice of amiodarone is amiodarone for maintenance of sinus rhythm after resumption of operation. Arrhythmia is more varied, classification is complex, the treatment may vary greatly, when the arrhythmia, should be treated under the guidance of a doctor, do not blindly take drugs, so as to avoid accidents.