Flomist Nasal Spray contains Fluticasone Propionate, a corticosteroid used to manage and relieve symptoms of allergic rhinitis, such as sneezing, runny nose, nasal congestion, and itching. Fluticasone works by reducing inflammation in the nasal passages, helping to ease breathing and reduce allergy symptoms. Common side effects may include nosebleeds, nasal irritation, and a slight unpleasant taste or smell. The spray is typically used once or twice daily as directed by a healthcare provider.