"Anesthetics" are not one kind of medicine, but many kinds. For simple local anesthesia, amides are commonly used, such as lidocaine, bupivacaine, and ropivacaine, while general anesthesia is A combination of multiple drugs, including intravenous and inhaled drugs, is required, and no single drug can be used alone to provide "anesthesia". Intravenous general anesthetic drugs act on the central nervous system and generally include hypnotic sedatives, analgesics, muscle relaxants and auxiliary drugs. Anesthetic drugs are the core of anesthesiology, and it is impossible to explain them clearly in a few words. Common contemporary intravenous anesthesia include There are even more auxiliary drugs including propofol, fentanyl, atracurium, succinylcholine, thiopental, ketamine, halothane, etc.