Cephalosporin is harmful to children if they take too much of it, which may cause allergic reactions, gastrointestinal dysbiosis, hepatotoxicity, renal damage and so on. 1. Allergic reaction: Cephalosporin may lead to rash, urticaria, asthma, drug fever, serum sickness-like reaction, neurovascular edema, anaphylaxis and so on. 2. Gastrointestinal flora imbalance: Cephalosporin may lead to gastrointestinal flora imbalance, triggering nausea, vomiting, loss of appetite and other symptoms. 3. Liver damage: too much Cephalosporin may cause damage to the liver, resulting in elevated transaminases, alkaline phosphatase and serum bilirubin. 4. Kidney damage: too much Cephalosporin may cause damage to the kidneys, resulting in increased blood urea nitrogen, blood creatinine values, as well as oliguria, proteinuria and so on. The use of drugs should be carried out under the guidance of a doctor, do not increase or decrease or stop the use of drugs, so as not to delay the condition or cause adverse reactions. If a child takes too much cephalosporin, it is recommended to seek medical treatment.