Get all-day relief from tough allergy symptoms with Allegra® 24 Hour Tablets. Relieve your hay fever and allergy symptoms like runny nose, sneezing, itchy, watery eyes, itchy nose, or itchy throat. Allegra® starts working in one hour — twice as fast as Claritin— and won't leave you feeling drowsy like Zyrtec. That is why it's the #1 allergist recommended non-drowsy allergy brand.