Montelukast is a prescription medication used to treat the symptoms of asthma and itchy, stuffy, or runny nose caused by allergies. Montelukast belongs to a group of drugs called leukotriene inhibitors which work by blocking leukotrienes, natural substances responsible for swelling in the airways, and tightening of muscles of airways, as well as nasal symptoms caused by allergies.

This medication comes in tablet, granule, and chewable tablet forms. It is usually taken once daily, with or without food.

Common side effects of montelukast include cough, fever, headache, and sore throat.