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 Allegra?br • Allegra is an antihistamine. Antihistamines work against the naturally occurring chemical histamine in your body.br • Allegra is used to prevent sneezing, runny nose, itching and watering of the eyes, and other allergic symptoms.br • Allegra may also be used for purposes other than those listed in this medication guide.