Make sure to tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements.
Montelukast is part of a group of medications called leukotriene modifiers. Leukotrienes are chemicals produced by the body in response to allergens or other problems. In the lungs, they cause swelling and inflammation in the airways and constriction of the muscles of the respiratory tract. In the nose, leukotrienes are released after exposure to allergens (substances that cause allergies), leading to allergy symptoms.
Montelukast works by blocking leukotriene receptors, preventing these chemicals from causing allergy or asthma symptoms.