Lidocaine is a local anesthetic and antiarrhythmic drug. It is a derivative of cocaine, but it has no hallucinations and addictive components of cocaine. Lidocaine hydrochloride is a white crystalline powder, easily soluble in water, its toxicity is equivalent to that of procaine, but the local anesthetic effect is strong and lasting, and it has good surface penetration. It can be injected or used as a surface anesthesia. Lidocaine is a very good local anesthetic. It usually takes effect one to three minutes after administration, and the effect lasts for one to three hours. Used to treat oral ulcers. As a heart rhythm disorder medicine, it is not used very often now, because some people are worried that it will have long-term side effects. A few people are allergic to lidocaine. Used in the treatment of arrhythmia in 1963, it is currently a drug for the prevention and treatment of acute myocardial infarction and various heart diseases complicated by rapid ventricular arrhythmia. It is the first choice for ventricular premature beats, ventricular tachycardia and ventricular tremor in acute myocardial infarction

It is widely used in surface anesthesia, infiltration anesthesia, conduction anesthesia and epidural anesthesia.