Montelukast
Also sold as: Singulair, Montiget
Prescription neededAsthma and breathing
Comes as:TabletChewable tabletSachet
Usual adult dose
Usual adult dose: 10 mg once a day in the evening. Children: chewable tablets or granules by age (4 or 5 mg) — ask your doctor. It does not relieve a sudden attack.
Your doctor may give you a different dose. Children's doses depend on weight.
Side effects
Common
- headache
- stomach pain
- diarrhoea
- tiredness
Serious — get help
Stop taking it and see a doctor straight away if you notice:
- mood or behaviour changes (bad dreams
- agitation
- depression
- thoughts of self-harm)
- severe allergic reaction
- numbness with rash and fever
Do not take it, or take care, if
- History of depression or mental health problems (use with caution and watch for mood changes)
- Not for the relief of a sudden asthma attack
- Phenylketonuria (some chewable tablets contain aspartame)
Interactions
Medicines that can react with this one.
Minor1 medicineUsually not a problem, but tell your doctor.
- Phenobarbital
Phenobarbital can lower montelukast levels and reduce its effect.