The harm of drinking after infusion mainly includes the damage to the body caused by alcohol itself and the damage caused by the possible reaction of alcohol with drugs. Alcohol has a certain degree of irritation, alcohol in the process of entering the human body, can cause a certain degree of stimulation of the gastrointestinal tract, may trigger a series of gastrointestinal reactions such as nausea, vomiting, and so on, and in severe cases, may lead to acute gastric mucosal hemorrhage and so on. Alcohol is absorbed through the oral mucosa, stomach and small intestine, 90% of the alcohol will be metabolized in the liver, ethanol is metabolized into acetaldehyde, acetaldehyde has a certain amount of damage to the body, and has a certain risk of carcinogenicity, when the acetaldehyde is too much, there can be a toxic reaction. Acetaldehyde is then metabolized into acetic acid, which is synthesized into fat and metabolized into water and carbon dioxide. In the whole process of metabolism, it will cause serious burden on the liver and affect liver function. Drinking alcohol after infusion, drugs may interact with alcohol, such as cephalosporins, will affect the process of acetaldehyde metabolism into acetic acid, resulting in the body of acetaldehyde aggregation, the occurrence of acetaldehyde toxicity, which is a disulfiram-like reaction, which may be life-threatening in severe cases. Not only is it harmful to drink alcohol before infusion, but it is even more harmful after infusion. It is recommended to maintain good living habits and quit smoking and drinking.