Aerius 5mg tablets with Desloratadine for 24-Hour Fast Relief Aerius 24 hour is a non-drowsy antihistamine that provides fast and effective allergy relief. Its long lasting action helps to relieve your allergy symptoms so you can do the things you like, without your allergy symptoms getting in the way. Aerius is clinically proven to relieve 15 different allergy symptoms (seasonal and year-round) for up to 24 hours, so you’re covered wherever, whenever. This allergy medicine provides fast and effective relief from allergy symptoms including nasal congestion, sneezing, runny nose, itchy nose, stuffiness, itchy, tearing and redness of the eyes, itchy palate, itchy ears, itchy throat and allergic cough.