Lidocaine Hydrochloride Injection is an antiarrhythmic and local anesthetic that should be used by a medical professional and not self-administered. Lidocaine Hydrochloride Injection produces a biphasic effect of excitation and depression on the central nervous system. In addition, at low doses, the drug exerts anti-ventricular arrhythmia effects, and at therapeutic doses, it has no significant effect on the electrical activity of cardiomyocytes, etc. If the dose is higher, it slows down cardiac conduction, inhibits myocardial contractility, and decreases the volume of cardiac blood discharge. As a local anesthetic, Lidocaine Hydrochloride Injection is mainly used for epidural anesthesia, infiltration anesthesia, surface anesthesia, nerve conduction block, etc. As an antiarrhythmic drug, it is mainly used for ventricular tachycardia and premature ventricular contractions after acute myocardial infarction, and also used for ventricular arrhythmias caused by cardiac surgery, digitalis intoxication, etc., but is usually ineffective for supraventricular arrhythmias. It should be noted that the use of lidocaine hydrochloride injection is prohibited in patients with hypersensitivity to local anesthetics, severe hepatic insufficiency, malignant hyperthermia, porphyria, and uncontrolled epilepsy, and the intravenous administration of this drug is prohibited in patients with acute cardiogenic cerebral ischemic syndrome, severe cardiac block, and preexcitation syndrome. Some patients may experience adverse reactions such as dizziness, dizziness, abnormal sensation, impaired consciousness, rash, nausea, vomiting, etc., which may cause respiratory arrest, bronchospasm, cardiac arrest in severe cases.