Rhinolast is a nasal spray medication primarily used for the treatment of allergic rhinitis, which is an allergic reaction that causes symptoms such as sneezing, itching, nasal congestion, and runny nose. The active ingredient in Rhinolast is azelastine hydrochloride, which belongs to a class of drugs known as antihistamines. Antihistamines work by blocking the action of histamine, a substance in the body that causes allergic symptoms. Rhinolast is effective in providing relief from both seasonal allergies, often caused by pollen from trees, grass, and weeds, as well as perennial allergies that may result from other allergens like dust mites, animal dander, and molds. It is available by prescription and is designed for intranasal use, offering a targeted approach to managing nasal allergy symptoms.