Generic Allegra D Generic Allegra D is a seasonal allergy medicine that your doctor can prescribe if it is right for you. Its active ingredient "Fexofenadine" leaves you without the drowsiness which can be caused by many antihistamines.
Generic Allegra D (Fexofenadine) used to relieve hay fever and allergy symptoms, including: runny nose, sneezing, and red, itchy, tearing eyes. Fexofenadine is in a class of medications called antihistamines. Generic Allegra works by blocking histamine, a substance in the body that causes allergic symptoms. Generic Allegra D (Fexofenadine) cause less drowsiness than other antihistamines.