The drug of choice for anaphylaxis is epinephrine hydrochloride injection. Because the condition of patients with anaphylaxis is very dangerous, it is a systemic allergy of the body to certain drugs, foods or biological products, and an acute hypoperfusion of peripheral tissues occurs, which then causes a systemic rapid-onset hypersensitivity reaction. In addition to shock, the patient often suffers from laryngeal edema, airway spasm, and pulmonary edema, which can be life-threatening and can quickly lead to death if not treated actively. The specific treatment is to give 0.1% epinephrine hydrochloride injection subcutaneously immediately if such a patient is found. If the effect is not good after 3-5 minutes, the injection can be repeated again. Generally, after 1-2 injections of epinephrine hydrochloride, most of the patients will gradually recover within half an hour. If the symptoms of shock are not relieved, glucocorticoids, such as dexamethasone injection, sodium hydrocortisone succinate for injection, methylprednisolone, etc., should be given early for infusion treatment.