Rhinolast nasal spray contains azelastine hydrochloride 0.1%, an antihistamine used to treat and prevent symptoms of allergic rhinitis, such as sneezing, runny or itchy nose, and nasal congestion. It works by blocking the effects of histamine, a chemical released during allergic reactions that causes inflammation and irritation in the nasal passages.

Applied directly into the nose, Rhinolast provides targeted relief within minutes and can last for up to 12 hours. It is suitable for seasonal allergies like hay fever as well as year-round allergies, and is usually used twice daily as directed by a healthcare professional.