Xiao Chai Hu Injection is a prescription drug, the main ingredient is Bei Chai Hu, the excipients are polysorbate 80 and sodium chloride, colorless transparent to slightly yellow clarified liquid, aromatic smell. Its main effect is to clear the heat and relieve the surface for the treatment of colds, influenza, malaria caused by fever, belongs to the antipyretic drugs, no fever symptoms should not be used, generally 2mL per intramuscular injection. Adverse reactions are mainly allergic reactions, which can cause anaphylaxis, rash, itching, dyspnea and blood pressure drop, systemic adverse reactions include chills, pain, weakness, etc. It can also cause palpitations, dizziness, convulsions, dry mouth, nausea, vomiting, abdominal pain, diarrhea, etc. Therefore, it is prohibited for people with a history of serious adverse reactions and for children. Intramuscular injection of Xiao Chai Hu should be used alone, avoiding the combination of drugs. Therefore, patients should observe its use in regular medical institutions and avoid private use.