Medication Information Leaflet
Montelukast prevents swelling of the airways and is used to prevent and treat asthma and allergic rhinitis. It can also be used for other conditions as determined by your doctor.
If you forget to take a dose, take it as soon as you remember. Then take your next dose at the usual time. Do not take two doses to make up for the missed dose.
Inform your healthcare professional if:
The side effects for Montelukast are usually mild and generally well tolerated. They include the following:
These symptoms may happen but should get better over time. Check with your doctor if any of these symptoms are serious or do not go away.
In some cases, this medication may be associated with the following changes to a person’s mental condition, especially in the first few weeks of treatment.
Please inform your doctor as soon as possible if you experience the above symptoms, or for your family or caregiver to inform your doctor if you are unable to seek treatment on your own.
Patients and parents/caregivers should stop Montelukast and discuss with their healthcare professional right away if you or your child experience behaviour or mood-related changes while taking the medication.
It is important to note that your doctor has prescribed this medication as he/she feels you will benefit more from taking this medication over the possible risks that it may cause. The risks of having these adverse effects are low. Most people take this medication without any of such problems.
The symptoms of a drug allergy include one or more of the following:
If you experience any of these symptoms, you should stop your medication and see your healthcare professional immediately.
Store in a cool and dry place, away from direct sunlight. Keep this medication away from children.
Pack this medication into a black trash bag and seal it tightly before throwing into the rubbish chute or bin.
If you take more than the recommended dose, please seek medical advice immediately. The information provided on this page does not replace information from your healthcare professional. Please consult your healthcare professional for more information.
This article is jointly developed by members of the National Medication Information workgroup. The workgroup consists of cluster partners (National Healthcare Group, National University Health System and SingHealth), community pharmacies (Guardian, Unity and Watsons) and Pharmaceutical Society of Singapore. The content does not reflect drug availability and supply information in pharmacies and healthcare institutions. You are advised to check with the respective institutions for such information.
Last updated on Nov 2021
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This article was last reviewed on Friday, May 26, 2023