Narcotics are drugs that act as anesthetics on the central nervous system and narcotics are in the category of prescription drugs. Anesthetics are divided into local anesthetics, general anesthetics and anesthesia-related analgesics. 1. Local anesthetic drugs: local anesthetic drugs are anesthetizing to local tissues, which can be divided into lipids and amides. Lipids are mainly procainamide. Amide class is more common in the clinic, mainly lidocaine, bupivacaine and other drugs. 2. General anesthesia drugs: mainly including intravenous anesthesia drugs and inhalation anesthesia drugs. Among them, intravenous anesthesia drugs mainly contain three kinds of drugs. The first is sedative drugs, mainly propofol, midazolam, etc.; the second is analgesic drugs, mainly opioid drugs, such as fentanyl, sufentanil, etc.; the third is muscle relaxation drugs, such as cis-atracurium, atracurium, etc.. Inhalation anesthesia drugs commonly used in the clinic is sevoflurane. 3. Anesthesia-related analgesics: such as morphine, dulcolax, etc., these drugs can not be taken for a long time, long-term use of such drugs can produce dependence or even addiction, non-essential shall not be used. The use of anesthetics should be flexible and appropriate according to the characteristics of each patient and the anesthesia method, in order to achieve better results. Anesthesia drugs must be used by the doctor, not self-administered, if allergies and other adverse reactions, should be promptly to the hospital to avoid delays.