Bilazap M Tablet belongs to a class of medication called 'anti-allergic medication, primarily used to treat allergic conditions 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.