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Montelukast

Medication leukotriene receptor antagonist respiratoryallergy
Aka: Singulair, Montek
Brands seen in Singapore: Singulair, Montelukast Sandoz, Montelair, Regulair, M-Kast
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Preventing asthma symptoms and allergic rhinitis
When to take
Once a day — NHS: most people take it in the evening
Take with
With or without food · chewables apart from meals
Pros & cons
Pros
  • One tablet a day — NHS: usual adult dose is 10 mg
  • Covers asthma and allergic rhinitis together
  • Plain tablets: with or without food (NHS)
Cons
  • Prescription-only in SG — not sold over the counter
  • Mood, sleep and behaviour changes are reported
  • Not for a sudden asthma attack (HealthHub)
Sources
  1. HealthHub (MOH Singapore) — Montelukast, uses section · read 2026-08-27
    what it says
    “Montelukast is used to treat and prevent asthma and allergic rhinitis … Montelukast blocks certain substances in the body called leukotrienes that cause inflammation of the airways and nose in asthma, or allergic rhinitis”
  2. HealthHub (MOH Singapore) — Montelukast, precautions and neuropsychiatric warning sections · read 2026-08-27
    what it says
    “You currently have, or previously had, any mental health conditions … Montelukast should not be used to treat sudden asthma attacks. You should have your rescue inhaler available for emergency use … neuropsychiatric side effects have been reported with Montelukast”
  3. HealthHub (MOH Singapore) — Montelukast, administration and food/medicine interaction sections · read 2026-08-27
    what it says
    “if you are sensitive to aspirin or have aspirin-sensitive asthma, continue to avoid aspirin and other anti-inflammatory medications while taking montelukast … Do not suddenly stop taking your prescribed steroid inhaler for asthma control when starting this medication”
  4. NHS — How and when to take montelukast, dosage section (brand name: Singulair) · read 2026-08-27
    what it says
    “The usual dose for adults and children aged 15 years old and over is one 10mg tablet once a day … Most people take montelukast once a day in the evening … Never take more than 1 dose a day”
  5. NHS — How and when to take montelukast, 'How to take it' and 'How long to take it for' sections · read 2026-08-27
    what it says
    “You can take montelukast non-chewable tablets with or without food … It's important to take chewable tablets at least 1 hour before food, or 2 hours after food … Do not stop taking montelukast without speaking to your doctor first”
  6. NHS — Side effects of montelukast, common side effects (brand name: Singulair) · read 2026-08-27
    what it says
    “These common side effects of montelukast happen in more than 1 in 100 people … Diarrhoea … High temperature … Headaches … Stomach pain … Feeling or being sick … A mild rash”
  7. NHS — Side effects of montelukast, serious side effects section · read 2026-08-27
    what it says
    “Call your doctor or call 111 immediately if: you notice mood changes and you become anxious, depressed or aggressive … hallucinations … new problems with your sleep … Call 999 or go to A&E if you have thoughts about harming yourself”
  8. HSA register of therapeutic products (data.gov.sg open data d_767279312753558cbf19d48344577084, datastore_search API) — montelukast rows · read 2026-08-27
    what it says
    “Productname: SINGULAIR TABLET 10 mg … Forensicclassification: Prescription Only … Productname: SINGULAIR CHEWABLE TABLET 4 mg … Prescription Only … Productname: Lukakline Chewable Tablet 5mg … Prescription Only … SINGULAIR ORAL GRANULES 4 mg/sachet”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.