Allegra (Fexofenadine) is well known drug used in antihistamines medications and it is similar to other antihistamines, such as Loratadine (Claritin) and Cetirizine (Zyrtec) and Azelastine (Astelin). Note:FEXOFENADINE has equivalent effect as branded Allegra. Buy Allegra generic and save 80% on each order.