• Montelukast is a leukotriene receptor antagonist. It works by blocking certain chemicals (leukotrienes) that cause inflammation, swelling, and breathing difficulty.

• Fexofenadine is a non-drowsy antihistamine. It helps relieve allergy symptoms like sneezing, runny nose, itching, watery eyes, and skin rashes.

Together, they are useful for controlling allergies and asthma-related symptoms in children.