Rynatan is a long-acting antihistamine/decongestant that relieves nasal stuffiness and middle ear congestion caused by hay fever and ongoing nasal inflammation. It can be used alone or with antibiotics and analgesics such as aspirin or acetaminophen. Azatadine, the antihistamine in these products, reduces itching and swelling and dries up secretions from the nose, eyes, and throat. Pseudoephedrine, the decongestant, reduces nasal congestion and makes breathing easier.