About Montelukast
Medically reviewed by Dr Khizer Hussain Junaidy, MD Pharmacology, Diabetologist & Bariatric Physician, on 23 Oct 2026.
What it is for
Prevents asthma symptoms and reduces allergic sneezing and blocked nose. Often combined with levocetirizine.
How to take it
Take it once a day in the evening, with or without food. It is not for a sudden asthma attack.
Common side effects
- Headache, stomach upset.
- Rarely, changes in mood or sleep, vivid dreams.
Call your doctor if
- Low mood, anxiety, sleep walking or thoughts of self-harm, in adults or children.
- Asthma getting worse.
Take care
Keep using your reliever inhaler for sudden breathlessness.
From our clinic: Parents: tell the doctor about any change in your child's behaviour or sleep.