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Urticaria is an allergic disease caused by the immune system of patients with low immunity who are exposed to allergens. If the course of urticaria is less than 6 weeks, it is acute urticaria. Antiallergic drugs such as chlorpheniramine and cetirizine can be taken under the guidance of a doctor. If respiratory symptoms are shown, oral corticosteroids can be taken to relieve it. Chronic urticaria with a course of more than 6 weeks requires antihistamine drugs such as loratadine and chlorpheniramine maleate to adjust the body immunity.