Anaphylaxis, which may be caused by contact with allergic foods, drugs, etc., mostly develops within half an hour after contact with the allergen, and the condition is more urgent, with nausea, vomiting, rash, respiratory distress and other adverse reactions, which should be resuscitated immediately in situ once they occur, and call 120. 1. 1. Disengage from the allergen: You should disengage or stop using the suspected allergen immediately to avoid aggravating the symptoms. If allergy occurs in the process of using drugs, a tourniquet can be tied at the proximal end of the drug injection site and relaxed once every 10-20 minutes according to the condition to prevent tissue necrosis. 2. Prevent asphyxia: Keep the patient in a flat position, loosen the clothespin and trouser belt, pay attention to keeping the airway open to prevent airway obstruction, and promptly remove secretions from the mouth, nasopharynx and trachea to avoid asphyxia. In case of laryngeal edema, emergency tracheotomy may be required, while closely monitoring vital signs; 3. Treatment with medication: Intramuscular injection of epinephrine can be given under the guidance of a doctor. In addition, two intravenous channels need to be opened immediately to replenish blood volume in time, while applying dexamethasone or hydrocortisone, which can be added to the glucose solution intravenous drip. If the blood pressure does not rise significantly, antihypertensive drugs such as dopamine or norepinephrine may be used. If obvious bronchospasm occurs, salbutamol solution can be nebulized and inhaled to relieve wheezing symptoms; 4. Cardiopulmonary resuscitation: If respiratory and cardiac arrest occurs, cardiopulmonary resuscitation is performed immediately.