Compare to Allegra Allergy 24 HR active ingredient. Amazon Basic Care All Day Allergy Relief contains fexofenadine hydrochloride, 180 mg, to relieve both indoor and outdoor allergy symptoms in adults and children 12 years of age and older. When seasonal or pet allergies strike, you need a medicine that works fast and provides all-day allergy relief. One dose of this allergy medicine works for up to 24 hours to relieve symptoms caused by hay fever or other upper respiratory allergies. Soothe your scratchy throat, runny nose, sneezing, and itchy, watery eyes. This non-drowsy antihistamine relieves your harsh allergy symptoms without the sleepy side effects. This product is gluten free.