Hello Thank You for contacting HCM. levocetirizine one at night for 5 days. Montelukast one daily for one month. Research has shown that it decreases the allergic symptoms considerably. I would also suggest you to under go allergy testing at allergy clinic as you have chronic allergy problem. It will tell that you are allergic to what specific thing. The results will help an allergist to prescribe you immunotherapy to that specific allergen and it will improve the problem. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. Wishing you good health.