Levocetirizine is a non-sedating 3rd generation antihistamine, works by blocking H1 receptor and prevents the release of other allergic mediators.

Montelukast is a selective and orally active leukotriene receptor antagonist which inhibits the cysteinyl leukotriene 1 receptor, effective and well-tolerated preventive treatment for asthma and allergic rhinitis in adults and children. Montelukast effectively controls airway inflammation (upper & lower) induced by leukotriene.