The mechanism of action of Fexofenadine Hydrochloride Tablets is to inhibit the release of histamine from peritoneal mast cells with H1-receptor antagonism, thus relieving symptoms caused by allergy. Fexofenadine Hydrochloride Tablets is a western drug used for the treatment of chronic idiopathic urticaria and seasonal allergic rhinitis, which can reduce the symptoms. The mechanism of action is to inhibit the release of histamine from peritoneal mast cells, has an antagonistic effect on peripheral H1-receptors, has anti-allergic efficacy, will not pass the blood-brain barrier, and has no inhibition of the central nervous system. The drug may have adverse reactions such as drowsiness, vertigo, back pain, sinusitis. It is contraindicated for those who are allergic to the components of this product. This product should not be used with magnesium and aluminum acid-forming agents for a short period of time; it should be used with caution in lactating women; it is not intended for use in pediatric patients under 6 years of age. Fexofenadine Hydrochloride Tablets should be applied under the guidance of a physician according to the condition, and should not be taken on its own, so as not to cause adverse consequences.