Loratadine tablets are not hormones, but second-generation antihistamines, commonly known as anti-allergic drugs, with selective antagonism of peripheral tissue H1 receptors, its antihistamine effect is fast-acting, strong and long-lasting, stronger than both astemizole and terfenadine. It is commonly used in the treatment of allergic symptoms. Compared with the first generation antihistamines, one of its major characteristics is that it has no drowsy effect. It is commonly used clinically for allergic rhinitis, acute or chronic urticaria, allergic conjunctivitis, hay fever and other allergic skin diseases. It is easy to use and can be taken only once a day, and its effect can be maintained for 24 hours, so the patient’s compliance is better and the efficacy in chronic urticaria is obvious. Finally, it is still important to remind you to use the medicine carefully under the guidance of your doctor and pharmacist.