The main indications for the action of fexofenadine hydrochloride tablets are: i. Seasonal allergic rhinitis is indicated for the relief of symptoms associated with seasonal allergic rhinitis, such as sneezing, runny nose, rhinitis and itching of the palate and throat, itchy, moist and red eyes, in adults and children 6 years of age and older. II. Chronic Idiopathic Urticaria is used to treat the skin symptoms of chronic idiopathic urticaria in adults and children 6 years of age and older, and is able to significantly reduce the amount of itching and wind clumps. Dosage and Administration: i. For adults with seasonal allergic rhinitis and children aged 12 years and above, the recommended dose of fexofenadine hydrochloride tablets is 60 mg twice a day and 180 mg once a day; the recommended starting dose for patients with renal insufficiency is 60 mg once a day; for children aged 6-11 years, the recommended dose of fexofenadine hydrochloride is 30 mg twice a day; for children with renal insufficiency The recommended starting dose for patients is 30mg once a day. For adults with chronic idiopathic urticaria and children aged 12 years and above, the recommended dose of fexofenadine hydrochloride is 60 mg twice a day; for patients with renal insufficiency, the recommended starting dose is 60 mg once a day; for children aged 6-11 years, the recommended dose of fexofenadine hydrochloride is 30 mg twice a day; for pediatric patients with renal insufficiency, the recommended starting dose is 30 mg once a day.