GoodRx compares Zyrtec vs. Claritin vs. Allegra to help you choose the best over-the-counter (OTC) antihistamine to treat your allergy symptoms. Find patient medical information for Fexofenadine (Allegra) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Experience fast*, all-day relief from tough allergy symptoms like runny nose, sneezing, itchy or watery eyes, and itchy nose or throat with Allegra® 24 Hour Tablets. Allegra® provides effective relief from allergy symptoms with 0% brain interference, keeping you alert and non-drowsy. Allegra 24 Hour Allergy may cause serious side effects. Stop using Allegra 24 Hour Allergy and call your doctor at once if you have: flu-like symptoms (fever, chills, unusual tiredness); new or worsening cough; pain; or signs of an ear infection --fever, ear pain or full feeling, trouble hearing, drainage from the ear, fussiness in a child. Fexofenadine, sold under the brand name Allegra among others, [10] is an antihistamine medication used in the treatment of allergy symptoms such as allergic rhinitis and urticaria. Shop Allegra Adult 24 Hour Allergy Tablets, Non-Drowsy Antihistamine and read reviews at Walgreens. Pickup & Same Day Delivery available on most store items. Fexofenadine (Allegra) is an antihistamine that treats and prevents allergy symptoms. It blocks histamine to reduce your symptoms. Allegra (fexofenadine) is a non-drowsy antihistamine used for seasonal allergic rhinitis and chronic idiopathic urticaria. Compared with first-generation agents, it has minimal CNS penetration and is less sedating, making it suitable for daytime use and tasks that require alertness. Allegra (fexofenadine) is an antihistamine used to treat allergy symptoms, including sneezing, itching, watery eyes, and a runny nose. Includes Allegra side effects, interactions, and indications.