High-risk drugs are very common in clinical practice, and improper application can cause human injury and death, and can generally be divided into three classes. class A is the most dangerous drugs, mostly seen in rescue drugs, such as epinephrine, norepinephrine, isoprenaline, insulin, magnesium sulfate, potassium chloride, and sodium nitroprusside, propofol, digoxin, amiodarone, concentrated salt, and opioid analgesics, which all belong to high-risk drugs. The second level is B, more common are drugs for cardiovascular diseases, such as favalin, radioactive intravenous contrast agents, iproniazid, colchicine injection and chemotherapy drugs, oxytocin, moderate sedative midazolam, these drugs belong to B. C drugs are more common are oral hypoglycemic drugs, methotrexate and muscle relaxants, oral chemotherapy drugs, peritoneal and hemodialysis fluids, etc.