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. What do Allegra products treat? Allegra products are commonly used to treat allergy symptoms such as runny nose, sneezing, itchy/watery eyes, itchy nose or throat, hives, nasal congestion, and. 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. Overview: Fexofenadine is an antihistamine that is taken to help treat allergy symptoms, such as a runny nose, itchy or watery eyes, sneezing, or an itchy nose or throat. Common side effects may. 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. Fexofenadine is an antihistamine. It is used to relieve the symptoms of hay fever (seasonal allergic rhinitis) and hives of the skin (chronic idiopathic urticaria). Antihistamines work by preventing the effects of a substance called histamine, which is produced by the body. Histamine can cause itching, sneezing, runny nose, and watery eyes. Allegra® provides effective relief from allergy symptoms with 0% brain interference, keeping you alert and non-drowsy. Fexofenadine Capsules or Tablets Fexofenadine is an antihistamine medication that comes in a capsule or tablet form. It treats and prevents symptoms of allergies like itchy eyes, sneezing and hives. It works by blocking histamine in your body. A common brand name of this medication is Allegra®. Shop Allegra for allergy relief at CVS Pharmacy. Choose from Allegra non-drowsy antihistamine in gel, liquid and tablet forms for both adults & children. Shop for Allegra in Allergy Medicine. Buy products such as Allegra Adult 24-Hour Allergy Relief Tablets, Non-Drowsy Indoor and Outdoor Allergy Medicine, 180 mg Fexofenadine HCI Antihistamine Pill, 40-Count at Walmart and save.