Levocetirizine Hydrochloride tablets have better long-term safety, but long-term use is not recommended, and after the allergy symptoms are relieved and disappear, the medication should be reduced or discontinued under the guidance of a doctor. Levocetirizine hydrochloride is an antihistamine drug that can be used in the treatment of allergic rhinitis and chronic idiopathic urticaria, thus relieving the itching, rash and other allergic phenomena caused by allergies. However, the drug is only used to alleviate allergy symptoms, not to cure the disease, and may cause dry mouth, headache, drowsiness and other adverse reactions, so it is not recommended to take long-term medication for the prevention of allergies. In order to reduce or prevent allergies, the first thing to do is to stay away from allergens. And try to avoid spicy and stimulating foods. Active exercise to improve physical fitness. Drugs need to be rationally applied under the guidance of physicians.