Yes it is safe to use. 1 month is not a long duration.

Yes But pls get your allergy tests too( IgE, skin prick allergy tests)

Yes you can

Yes it is

You can use it for a month if you have nasal congestion or inferior turbinates hypertrophy.but also visit the doctor physically for proper assessment before use.

yes it's safe

Hi, I am Dr. Atul Kumar Nimawat MS ENT. Duonase nasal spray contains a combination of an intranasal corticosteroid (Fluticasone) and an antihistamine (Azelastine). It is generally prescribed for allergic rhinitis or nasal inflammation where dual action (anti-inflammatory + anti-allergic) is needed. Duration of Use: It can be used safely for 2–4 weeks under medical supervision. For longer durations (like 1 month or more), regular follow-up is essential to monitor for any side effects like nasal dryness, irritation, or, rarely, mucosal thinning.