Compare to the active ingredient of Allegra Allergy 24 HR. All Day Allergy Relief contains fexofenadine hydrochloride, 180 mg, to relieve indoor, outdoor, seasonal or pet allergy symptoms for 24 hours. Fexofenadine HCl is the number one recommended non-drowsy adult oral antihistamine OTC active ingredient among allergists (of U.S. physicians surveyed by an independent market research firm). Just one dose of this powerful allergy medicine works quickly to relieve symptoms caused by hay fever or other upper respiratory allergies. Soothe your itchy throat, runny nose, sneezing, and itchy, watery eyes. This non-drowsy antihistamine relieves your harsh allergy symptoms without leaving your feeling sleepy or drowsy. Gluten free. For adults and children 12 years of age and older.