Montair FX Tablet belongs to a class of medication called 'anti-allergic' medication primarily used to treat allergic symptoms like sneezing, runny nose, congestion, stuffy nose or watery eyes. An allergy is a condition that occurs when the immune system reacts to a foreign substance that is typically not harmful to your body. These foreign substances are known as ‘allergens.’ Some might be allergic to certain foods and seasonal allergies like hay fever, pollen or pet dander. One of the main symptoms of allergy is cough, and it acts as a reflex action in the throat when there is any mucus or foreign irritant entry into the respiratory system.