Aerius is a prescription antihistamine medication containing 5mg Desloratadine in film-coated tablet form. Manufactured by MSD, it is a long-acting, non-sedating antiallergic medication designed for once-daily dosing. Each pack contains 30 tablets. The active ingredient Desloratadine is clearly marked on the packaging in a distinctive blue and white color scheme. The tablets are film-coated for ease of swallowing. As a prescription medication, it should only be taken under the direction of a healthcare provider at the recommended dosage.