Fexofenadine belongs to the H1 receptor antagonist and is indicated for the relief of symptoms caused by seasonal allergic rhinitis and chronic idiopathic urticaria. Fexofenadine belongs to the second generation of H1 receptor antagonists, selectively blocking the histamine H1 receptor, exerting antihistamine effects, but does not produce anticholinergic, anti-adrenergic and anti-5-hydroxytryptophan effects, so there is no other central nervous system effects and sedative effects, and cetirizine, loratadine, ibogaine, and so on belong to the same class of drugs. Clinically, fexofenadine is used in children over 6 years of age as well as adults for the relief of symptoms of seasonal allergic rhinitis, including sneezing, runny nose, itchy palate and throat, and itchy eyes; and for the skin symptoms of chronic idiopathic urticaria, to reduce the amount of itching and windburn. Common adverse reactions to this medication include headache, drowsiness, nausea, and fatigue; it is contraindicated for those who are allergic to this product and should not be taken with aluminum or magnesium acid-forming agents for short periods of time. If you need to use the drug, please use it under the supervision of a doctor to avoid serious adverse reactions.