Loratadine tablets are a commonly used second-generation antihistamine drug. By efficiently blocking histamine receptors, they can quickly relieve the symptoms of sneezing, runny nose, nasal itching, nasal congestion and itchy eyes caused by allergic rhinitis, as well as the itching and wheals of skin allergies such as urticaria. Its characteristics are rapid onset, continuous effect for 24 hours, and it is not easy to pass through the blood-brain barrier. Usually, it has no side effect of drowsiness, high safety, and is suitable for daily anti-allergy needs. It is a basic oral drug for symptomatic treatment of allergic diseases.