Allegra tablets 120mg contain fexofenadine 180mg, which is an antihistamine that blocks the action of histamine in allergic reactions, and they are used to treat symptoms of allergic rhinitis (runny itchy nose and sneezing) and urticaria or hives (red itchy limps on the skin). For more : http://pillsformedicine.com/ProductDetails.aspx?pkid=52&catId=9