INDICATIONS. Astelin Nasal Spray is indicated for the treatment of the symptoms of seasonal allergic rhinitis in adults and pediatric patients 5 years and older, and for the treatment of the symptoms of vasomotor rhinitis in adults and adolescent patients 12 years and older.he recommended dosage of Astelin Nasal Spray in pediatric patients 5 years to 11 years of age is one spray per nostril twice daily. The recommended dosage of Astelin Nasal Spray in adults and adolescent patients 12 years and older with vasomotor rhinitis is two sprays per nostril twice daily.