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Compare to the active ingredient in XYZAL Allergy 24HR in original prescription strength. Find 24 hour relief of allergy symptoms with Amazon Basic Care Levocetirizine Dihydrochloride Tablets, 5 mg, Antihistamine, All Day Allergy Relief. It works fast and offers clinically proven relief in just 60 minutes. This powerful allergy medication soothes your toughest allergy symptoms, such as sneezing, runny nose, itchy nose or throat and itchy, watery eyes. Clinically proven relief from hay fever, respiratory allergies or other indoor and outdoor allergens. This all day allergy relief antihistamine tablet is gluten free. One dose provides 24-hour relief. Made in Spain.