About the Drug : Levocetrizine works by blocking histamine receptors. It does not prevent the actual release of histamine from mast cells but prevents the release of other allergy chemicals & increased blood supply to that area .

Montelukast is an Oral leukotrine receptor antagonist for the treatment of allergy & asthma. Leukotrienes are a group of naturally occurring chemicals which promotes inflammation & montelukast being an antagonist for leukotriene prevents inflammation.