For tough allergy symptoms, Allegra 24-Hour Adult Non-Drowsy Antihistamine Tablets are fast*, non-drowsy and last 24 hours to help you relieve your worst allergy symptoms. Allegra tablets start working in one hour to give you round-the-clock relief from sneezing, runny nose, itchy and watery eyes, and itchy nose or throat. One allergy pill is all you need for 24-hour relief from allergy symptoms with full prescription strength available over the counter. Formulated with active ingredient fexofenadine HCI, Allegra Non-Drowsy Allergy Medicine provides powerful relief from indoor and outdoor allergies, including seasonal allergies and pet allergies. Best of all, Allegra allergy medicine won't cause drowsiness, so you don't have to worry about feeling tired after you take it. Be ready for spring allergies, fall allergies, dog allergies and more. Stock up on Allegra 24-Hour Non-Drowsy tablets for fast*, effective allergy relief whenever you need it. *Starts working in one hour; applies to first dose only. Among single-ingredient branded OTC oral antihistamines.