• Montelukast is a leukotriene receptor antagonist. It helps prevent substances in the body (leukotrienes) that cause inflammation, swelling, cough, and breathing trouble.

• Levocetirizine is an antihistamine. It blocks histamine, a natural chemical that triggers sneezing, itching, runny nose, and watery eyes.

Together, this combination controls both allergy symptoms and asthma-related breathing problems in children.