Montelukast - oral

Patient Medicine Information
Why do I need this medicine?
Montelukast is used in the management of asthma.

It may also be used to prevent breathlessness that is triggered by exercise or physical exertion.

This medicine can also be used to relieve symptoms of cold and allergy, such as runny nose, itch, watery eyes and sneezing.
How do I take this medicine?
Take Montelukast exactly as directed by your doctor or according to the instructions on the label. Do not take more or less than instructed by your doctor.

You may take this medicine with or without food. Try to take it at the same time each day. It is best taken in the evening.

This medicine is available as a tablet, chewable tablet or oral granules.

If you are taking the granules, it should be taken directly in the mouth or mixed with a spoonful of cold or room temperature soft foods such as applesauce, carrots, rice or ice cream. You may also dissolve this medicine in a spoonful of cold or room temperature baby formula or breast milk. Do not dissolve the granules in any other liquid. Consume within 15 minutes of opening the foil packet.

Montelukast must be taken regularly for it to be effective. Continue taking this medicine even when you feel better. Do not stop taking it unless instructed by the doctor.
What should I do if I have forgotten to take this medicine?
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and return to your normal dosing schedule.

DO NOT double a dose under any circumstances.

If you often forget to take your medicine, let your doctor and pharmacist know.
What should I take note of while taking this medicine?
Let your doctor know if you are pregnant or breastfeeding.

Montelukast will not relieve an acute asthma attack. Therefore, you must use "rescue medicines" such as an inhaler to treat these attacks. Ask your doctor about what you should do when you have an acute asthma attack.

If you have asthma and taking aspirin makes it worse, keep avoiding aspirin and NSAIDs while taking Montelukast.

Why is it important to keep my appointments with the doctor?

Keep your appointments with your doctor. Your doctor needs to monitor your condition and check your response to the medication regularly.
What side effects could I experience?
Montelukast may cause drowsiness or dizziness. If affected, do not drive or take part in any activity in which you need to be alert.

Other side effects include any of the following: headache, diarrhoea, nausea, vomiting, indigestion, stomach pain, fever, rash, common colds, flu, cough, sore throat, sore eyes, itching or dry, itchy skin, ear pain, ringing in the ears, nearsightedness, and nosebleed.

Some side effects may need immediate medical help. Alert your doctor quickly if you experience:
  • skin rash, fever, swollen face and lymph nodes (on the side of the neck or behind the ears)
  • flu-like illness, pins and needles or numbness of arms and legs, weakness, weight loss
  • unusual changes in mood or behaviour (being too depressed, agitated, or having compulsive and impulsive behaviour)
Inform your doctor if any of these side effects do not go away or are severe, or if you experience other side effects.
Can I take this with other medicines?
Inform your doctor and pharmacist if you are taking any of these medicines:
  • medicine to treat TB (lung infection known as tuberculosis) e.g. rifampicin
  • medicines for epilepsy (fits or seizures) e.g. phenytoin, phenobarbital
  • gemfibrozil (cholesterol-lowering medicine)
  • medicines for pain and inflammation e.g. aspirin, diclofenac
This list does not include all medicines that may interact with Montelukast.

Always notify your doctor and pharmacist if you are taking any other medicines, including herbal tonics such as traditional Chinese medicines, supplements and medicines that you buy without a prescription.
What special dietary instructions should I follow?
Avoid alcohol.
How should I store this medicine?
Store in a cool, dry place away from the reach of children.

Protect from light and moisture.

Medicines must not be used past the expiry date.

Granules that have been mixed with any kind of food should not be stored for future use. Throw away any unused portion.
This information is independently developed by MIMS based on montelukast - oral and is provided for your reference only. It is not a replacement for and should only be used in conjunction with full consultation with a licensed healthcare professional, the information provided by your pharmacist and/or the manufacturer of the medication. It may not contain all the available information you require and cannot substitute professional medical care, nor does it take into account all individual circumstances. Although great effort has been made to ensure content accuracy, we shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2021 MIMS. All rights reserved. Powered by
Register or sign in to continue
Asia's one-stop resource for medical news, clinical reference and education
Sign up for free
Already a member? Sign in