Montelukast is used for prevention and long-term treatment of asthma. It is also used in certain patients to relieve allergy symptoms (eg, itchy, runny or stuffy nose, sneezing) and to prevent asthma attacks caused by exercise. It may also be used for other conditions as determined by your doctor.
Montelukast is a leukotriene receptor antagonist. It works by blocking a substance called leukotriene, which helps to decrease certain asthma and allergy symptoms.