Astelin belongs to antihistamines which purpose is to block histamines in the human organism. It’s a spray that deletes nasal congestion, itching, and sneezing. The medicine is effective in case of infection, inflammation, and allergic reaction which result in itching, stuffy, and runny nose. Medics usually prescribe it for adults and children above five (in case of seasonal allergy) and above twelve (in case of vasomotor rhinitis that constricts and dilates a vein, artery, or capillary in the nasal cavity).