I have allergic rhinitis and i am taking muntelukast and zyrtic , nasonex (mometasone) sterimar for almost 3 months , still i have nasal congestion what can i d0?

Go see your doctor: Sounds like you're on a good regimen, including leukotriene inhibitor, oral antihistamine & nasal steroid. Find out what's causing allergies by getting skin or blood test looking for allergens that can be avoided. Short of that, you can try different antihistamines and/or nasal steroids. Just b/c one brand doesn't work doesn't mean another won't. It's like choosing btwn chevy, dodge & ford.

Next step: Get a thorough ENT exam, possibly there is an anatomic reason for your continuted congestion; like a deviated septum or turbinate abnormalities; or enlarged adenoids(not likely in adult). Also, allergy testing can be done and possibly you could get started on allergy immunotherapy(shots) or sublingual immunotherapy(drops under tongue) to give you better symptom control and treat the problem.

Allergy evaluation: The medications are appropriate for allergic rhinitis. An allergy evaluation shoudl be completed if not done already. This would indicate if in fact you have an allergic conditon or if some other condition needs to be explored.