Levocetirizine belongs to a class of drugs called antihistamine or anti-allergic. It treats sneezing, runny nose, and allergic skin due to various allergies and hay fever (seasonal allergy). An allergy is an immune system response to foreign elements typically not harmful to your body. These foreign elements are known as ‘allergens.’ Allergic condition varies from person to person. 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 in the respiratory system.