Prescription
Leukotriene receptor antagonist (anti-asthma medicine)
Montelukast
Last reviewed April 2026
Who is this for?
What is this drug?
Montelukast is a medicine that works by blocking a natural substance in your body called leukotriene, which causes swelling and tightening of the airways — this helps you breathe more easily.
What is it used for?
Asthmaprevention of exercise-triggered breathing difficultyallergic rhinitis (runny nosesneezingand itchy eyes caused by allergies)
Prescription Required
A doctor's prescription is required to obtain this drug legally.