Drug allergy is one of the common causes of hives. If hives are caused by drug allergy, the first thing to do is to stop taking the medication immediately and avoid taking it again. Its treatment includes general treatment, drug treatment and physical therapy. 1. General treatment: If the urticaria is caused by drug allergy, the first thing you need to do is to stop taking the drug immediately, clarify the allergy drug, and avoid taking it again. In addition, need to pay attention to skin care, avoid scratching the lesions. 2. Drug therapy: patients can follow the doctor’s instructions for oral antihistamines, including cetirizine, loratadine, etc., which can help anti-allergy and anti-inflammatory. 3. Physical therapy: for patients with refractory chronic urticaria, you can also choose the complementary long-wave ultraviolet or medium-wave ultraviolet treatment, which can promote the rash to subside and accelerate the recovery. Drug allergy caused by urticaria treatment is not unique, it is recommended that patients go to a regular hospital, with the doctor for standardized treatment.