Levocetirizine is the active component in 100 GM Leuko Powder. It works by inhibiting a naturally occurring chemical that induces allergic rejection. It is used to treat, control, prevent, and improve illnesses, conditions, and symptoms such as ear-round allergies, hay fever, dust or pet allergies, swelling in the skin, reddish itching weals, inflammation of the mucous membrane of the nose, and many more. All in all, the 100 GM Leuko Powder is an anti-allergy medication that is used to alleviate allergy symptoms.