Docaine generally refers to lidocaine, which has a number of side effects, mainly in the cardiovascular system and the nervous system. 1. Cardiovascular system: Lidocaine also has some anti-arrhythmic effects on the cardiovascular system, but improper use can also affect the cardiovascular system, resulting in arrhythmia. 2. Nervous system: Lidocaine also has some neurological adverse reactions, mainly dizziness, vertigo, nausea, vomiting, lethargy, slurred speech, sensory abnormalities and muscle tremors, convulsions, confusion and respiratory depression, the need to reduce or stop the drug. Lidocaine is currently used in clinical surface anesthesia, local infiltration anesthesia, nerve block anesthesia, epidural anesthesia and treatment of ventricular arrhythmias. Lidocaine belongs to the narcotic drugs, but also for strict management of prescription drugs, should be strictly comply with the medical advice to use drugs, if any discomfort, it is recommended to consult a doctor in time.