Drug allergy itch, if the symptoms are mild, drink more water after stopping the drug can be self-healing. If the symptoms are serious, stopping the drug is difficult to self-cure, serious cases may even be life-threatening. If the symptoms are mild, the general patient immediately stop the drug symptoms can be relieved, drink more water with the drug metabolism discharge can be cured. If the patient’s symptoms are serious, such as urticaria-type drug rash, erythema multiforme type drug rash, if not treated is not self-cure, some patients with severe symptoms even appear such as respiratory difficulties, laryngeal edema and other anaphylactic shock manifestations, if not treated in a timely manner, can be life-threatening. Even if the symptoms of drug allergy are mild, it is recommended to go to the hospital for treatment, which can shorten the duration of the disease. During the treatment, strictly follow the doctor’s instructions to use medication and drink more water to promote drug excretion. Keep a record of the allergic drug and avoid re-exposure to the drug or drugs with similar structure.