Syntaris is a nasal spray medication primarily used for the treatment of allergic rhinitis, a condition characterized by symptoms such as sneezing, itching, nasal congestion, and runny nose due to allergies. The active ingredient in Syntaris is flunisolide, which belongs to a class of drugs known as corticosteroids. Corticosteroids work by reducing inflammation and suppressing the immune system's response to allergens, thereby alleviating the symptoms associated with allergic reactions. Syntaris is designed for intranasal use and is typically prescribed for both seasonal and perennial allergic rhinitis. It is important for patients to follow their healthcare provider's instructions regarding dosage and use to ensure effectiveness and minimize potential side effects.