Antihistamines can be used to treat hives. Urticaria may be caused by drugs, infections, heredity, etc. Patients may have symptoms such as erythema and clammy skin with itching, and in more severe cases, laryngeal edema, dyspnea, chest tightness, etc. Antihistamines have the ability to inhibit itching, reduce edema, and inhibit smooth muscle contraction. Antihistamine drugs have the effect of inhibiting itching, reducing edema, inhibiting smooth muscle contraction, etc. They are generally used for the treatment of urticaria, eczema, itching caused by various factors and other diseases. Common drugs are loratadine, ebastine, cetirizine and so on, patients need to follow the doctor’s instructions for the use of drugs, improper use may appear sedation, drowsiness, inattention symptoms. Urticaria is recommended to go to the hospital in time for medical treatment, do not self-medication to avoid danger.