Dd ( who is 6) has had a cough for 3 weeks. Dr thinks its a post nasal drip and wants her to try a steriod nasal spray beconase. When I picked it up pharmacist said she only be on it a week and box said only for over 18 years. Queried it with pharmacist who said that was only for buying it and it is licensed for over 6 years. Now I'm a bit worried. Is flixonase any safer? Any advice please.