The 12-Hour Allergy Relief Tablets, 60 mg are over-the-counter antihistamine medications designed to provide temporary relief from allergy symptoms for up to 12 hours. The main active ingredient is Fexofenadine Hydrochloride, 60 mg, a non-sedating antihistamine that relieves symptoms such as sneezing, runny nose, watery or itchy eyes, and itching in the nose or throat associated with hay fever or other upper respiratory allergies.