Cetirizine Hydrochloride Tablets is a kind of antiallergic drug, which is mainly used for the treatment of allergic diseases in clinic. The main ingredient of Cetirizine Hydrochloride Tablets is Cetirizine Hydrochloride, which is the second generation of H1 receptor antagonist, which can inhibit the transmission and action of histamine, reduce the activity of inflammatory cells, and effectively inhibit skin allergic reactions. Clinically, it is mainly used for the treatment of allergic rhinitis, allergic conjunctivitis, seasonal rhinitis and urticaria, etc. It can also be used for the treatment of allergic reactions caused by medicines or foods. It is contraindicated for pregnant and lactating women, patients who are allergic to the product and those with severe renal impairment. In addition, headache, dizziness, drowsiness, dry mouth and other adverse reactions may occur after the use of the drug, the occurrence of the above discomfort need to consult a doctor in time. It should be noted that Cetirizine Hydrochloride Tablets should be used under the guidance of a doctor, avoid self-medication.