Compare to Zyrtec Tablets active ingredient. Don’t let allergy symptoms slow you down. Relieve your indoor, outdoor and pet allergies with Equate 24 Hour Allergy. Each dose contains 10 mg of cetirizine hydrochloride, a powerful antihistamine that relieves itchy, watery eyes; sneezing; itchy nose or throat and runny nose. In full prescription strength, just one tablet provides all day allergy relief. When used as directed by adults and children 6 years and over, this allergy medicine provides effective relief for symptoms due to hay fever or other upper respiratory allergies for a full 24 hours. This product is gluten free.