Generic Name: montelukast (mon te LOO kast)
Brand Name: Singulair
What is montelukast?
Montelukast is a leukotriene (loo-koe-TRY-een) inhibitor. Leukotrienes are chemicals your body releases when you breathe in an allergen (such as pollen). These chemicals cause swelling in your lungs and tightening of the muscles around your airways, which can result in asthma symptoms.
Montelukast is used to prevent asthma attacks in adults and children as young as 12 months old. Montelukast is also used to prevent exercise-induced bronchospasm in adults and children who are at least 6 years old.
Montelukast is also used to treat symptoms of year-round (perennial) allergies in adults and children who are at least 6 months old. It is also used to treat symptoms of seasonal allergies in adults and children who are at least 2 years old.
Do not give this medicine to a child without a doctor's advice.
Montelukast is also used to prevent exercise-induced bronchoconstriction (narrowing of the air passages in the lungs) in adults and teenagers who are at least 15 years old and are not already taking this medicine for other conditions.
If you already take montelukast to prevent asthma or allergy symptoms, do not use an extra dose to treat exercise-induced bronchoconstriction.
Montelukast may also be used for purposes not listed in this medication guide.
Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.
Before taking this medicine
You should not use montelukast if you are allergic to it.
To make sure montelukast is safe for you, tell your doctor if you have:
asthma, or a history of severe allergic reaction to aspirin.
The chewable tablet may contain phenylalanine. Talk to your doctor before using this form of montelukast if you have phenylketonuria (PKU).
Montelukast is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
It is not known whether montelukast passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
How should I take montelukast?
Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Montelukast is usually taken once daily in the evening for prevention of asthma or allergy symptoms. For exercise-induced bronchoconstriction, take a single dose at least 2 hours before you exercise, and do not take another dose for at least 24 hours. Follow your doctor's instructions.
Montelukast is not a rescue medicine. It will not work fast enough to treat an asthma attack. Use only a fast acting inhalation medicine for an asthma attack. Tell your doctor if it seems like your asthma medications don't work as well.
Swallow the regular tablet whole, with a glass of water.
The chewable tablet must be chewed completely before you swallow it.
The oral granules can be placed directly into the mouth and swallowed, or mixed with a spoonful of applesauce, mashed carrots, rice, or ice cream. Oral granules can also be mixed with 1 teaspoon of baby formula or breast milk. Do not use any other type of liquid for mixing the granules. Other liquids can be taken before or after taking the medicine.
After opening or mixing the oral granules, you must use them within 15 minutes. Do not save an open packet or mixed medicine for later use.
It may take up to several weeks before your symptoms improve. Keep using the medication as directed and tell your doctor if your symptoms do not improve after several weeks of treatment.
If you also take a steroid asthma medicine, do not stop using it suddenly without first talking to your doctor. You may need to use less and less before you stop the medication completely.
Asthma is usually treated with a combination of drugs. Use all medications as directed by your doctor. Read the medication guide or patient instructions provided with each medication. Do not change your doses or medication schedule without your doctor's advice, even if you have no asthma symptoms.
Store at room temperature away from moisture and heat. Do not open a packet of oral granules until you are ready to use the medicine.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking montelukast?
Avoid situations or activities that may trigger an asthma attack.
If your asthma symptoms get worse when you take aspirin, avoid taking aspirin or other NSAIDs (nonsteroidal anti-inflammatory drugs) while you are taking montelukast. NSAIDs include ibuprofen (Advil, Motrin), naproxen (Aleve), celecoxib, diclofenac, indomethacin, meloxicam, and others.
Montelukast side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
unusual changes in mood or behavior;
skin rash, bruising, severe tingling, numbness, pain, muscle weakness;
ear pain, swelling, or warmth; or
severe skin reaction--fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Common side effects may include:
stomach pain, diarrhea;
fever or other flu symptoms;
cold symptoms such as stuffy nose, sinus pain, cough, sore throat;
bed-wetting or loss of bladder control in children.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect montelukast?
Other drugs may interact with montelukast, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.
More about Singulair (montelukast)
- Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Compare Alternatives
- Support Group
- Pricing & Coupons
- En Español
- 139 Reviews – Add your own review/rating
- Generic Availability
- Drug class: leukotriene modifiers
- Singulair (Montelukast Chewable Tablets)
- Singulair (Montelukast Oral Granules)
- Singulair (Montelukast Tablets)
- Singulair (Advanced Reading)
Related treatment guides
Where can I get more information?
- Your pharmacist can provide more information about montelukast.
- Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
- Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2012 Cerner Multum, Inc. Version: 13.01.
Date modified: January 03, 2018
Last reviewed: December 23, 2014