Azelastine is used to treat nasal allergy symptoms,including sneezing and stuffy, runny and itchy nose. It can be used for both seasonal and indoor/environmental allergies. It comes in spray form. Because it is not digested and doesn't enter the bloodstream, it has a low risk of interaction with other drugs. As with other drugs, make your doctor aware of any medications you may be taking, including prescription and over-the-counter drugs, as well as supplements and herbal remedies.