This NHS content is written for people in England. Medicine names, availability, prescribing and services may differ in other countries.
Montelukast is used to prevent the symptoms of asthma. It's usually prescribed when asthma is mild and can stop it from getting worse.
It can also help people with asthma who have breathing difficulties when they exercise (exercise-induced asthma) and seasonal allergies, such as sneezing, itchiness and a blocked or runny nose (allergic rhinitis).
Montelukast is sometimes given to people without asthma to treat hives (urticaria) that last for more than 6 weeks.
It's only available on prescription. It comes as tablets or granules.
Important
Do not use montelukast to treat an asthma attack. Always use your reliever inhaler.
View the original NHS website page ↗. Refreshed 19 August 2026.
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