Aerius oral solution is an antiallergy medicine that does not make you drowsy. It helps control your allergic reaction and its symptoms. It relieves symptoms associated with allergic rhinitis (inflammation of the nasal passages caused by an allergy for example hay fever or allergy to dust mites). These symptoms include sneezing runny or itchy nose itchy palate and itchy red or watery eyes. Aerius oral solution is also used to relieve the symptoms associated with urticaria (a skin condition caused by an allergy). These symptoms include itching and hives.