Clinical treatment of arrhythmia commonly used injections are amiodarone, lidocaine, isoproterenol, etc., the specific use of drugs need to be used according to medical advice. 1. Amiodarone: It is mainly used for atrial fibrillation, atrial flutter and ventricular tachycardia where lidocaine is ineffective. Adverse reactions such as nausea and vomiting, liver function abnormalities may occur after use. Individuals who are allergic to iodine may be sensitized to this drug, and the results of electrocardiograms may be affected by its use. This drug is contraindicated in the presence of severe sinus node function abnormalities, severe atrioventricular block. 2. Lidocaine: Mainly used for the treatment of ventricular tachycardia, premature ventricular contractions, ventricular fibrillation and other ventricular arrhythmias. Adverse reactions such as dizziness, nausea and vomiting, allergy may occur after use. The use of the drug needs to be vigilant in the case of anesthetic toxicity. Allergy to local anesthetic, pre-excitation syndrome, severe hepatic and renal dysfunction, etc. are prohibited. 3. Isoprenaline: used for complete atrioventricular block, cardiac arrest. Adverse reactions such as dry mouth, palpitation, nausea and tremor may occur. It should be used with caution in patients with diabetes mellitus and hypertension, and is contraindicated in patients with angina pectoris and hyperthyroidism. All the above medicines should be used in hospitals by medical personnel and should not be applied without authorization.