Generic name:br Fexofenadinebr Description:br Allegra (Fexofenadine) is an antihistamine used to relieve symptoms of seasonal allergies such as runny or itchy nose; sneezing; itchy throat; and watery, itchy, or red eyes. This medicine may also be used to treat hives and other conditions as determined by your doctor.br Synonyms:br Fexigra, Fexodin, Fexolup, Carboxyterfenadine, Terfenadine acid metabolite, Terfenadine carboxylate,br What is the most important information I should know about Allegra?br • Never take more of this medication than is directed by your doctor. If your symptoms are not being adequately treated, talk to your doctor.