Lidocaine aerosol is primarily used for local anesthesia of the skin and mucous membranes, has some toxic effects, and is capable of decreasing cardiac autonomic rhythm. The toxic effects of lidocaine are increased during prolonged use due to the accumulation of metabolites in the liver. Severe bradycardia, severe atrioventricular block, and decreased myocardial contractility can result. Prolonged use of lidocaine aerosol can lead to the development of drug resistance in the body, making the body less sensitive to lidocaine. It is recommended to standardize and rationalize the use of medication under the guidance of a doctor, and stop the medication as soon as an allergic reaction such as rash and edema occurs. Avoid overuse of drugs to bring adverse consequences.