Table of Contents > Drug > Montelukast Print



Related terms
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    Related terms
    • Brand Names: U.S.: Singulair®
    • Brand Names: Canada: Apo-Montelukast;Montelukast Sodium Tablets;Mylan-Montelukast;PMS-Montelukast;PMS-Montelukast FC;Sandoz-Montelukast;Sandoz-Montelukast Granules;Singulair®;Teva-Montelukast

    • It is used to ease allergy signs.
    • This drug is used to stop exercise-induced breathing problems.
    • It is used to stop or treat asthma.
    • Montelukast lowers the body's making of a group of chemicals called leukotrienes that cause asthma to get worse.
    • It lowers or stops the body's reaction to the allergen.


    How to take

    • If working out or playing sports causes signs, use at least 2 hours before doing it.
    • Take even during sign-free periods.
    • If this drug is for asthma, take in the evening.
    • If this drug is for allergies, take at the same time of day.
    • Take with or without food. Take with food if it causes an upset stomach.
    • Chewable tablet: Chew or crush well. Mix crushed tablet with food. Do not swallow it whole.
    • Granules may be taken by mouth or mixed with applesauce, carrots, rice, or ice cream. Do not mix granules in liquids.

    Missed Dose

    • Take a missed dose as soon as you think about it.
    • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
    • Do not take 2 doses at the same time or extra doses.
    • Do not change the dose or stop this drug. Talk with the doctor.


    • Store in the original container at room temperature.
    • Protect from light.
    • Protect from water. Do not store in a bathroom or kitchen.
    • Use granules right after opening.



    • If you have an allergy to montelukast or any other part of this drug.
    • Tell your doctor if you are allergic to any drugs. Make sure to tell about the allergy and what signs you had. This includes telling about rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.


    • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
    • Do not use this drug to stop exercise-induced breathing problems if you are already using it for asthma or allergy.
    • Wear disease medical alert ID (identification).
    • Check all drugs you are taking with your doctor. This drug may not mix well with some other drugs.
    • If you have PKU, talk with your doctor. Some products have phenylalanine.
    • Tell your doctor if you are pregnant or plan on getting pregnant.
    • Tell your doctor if you are breast-feeding.

    Side Effects

    • Flu-like signs. These include headache, weakness, fever, shakes, aches, pains, and sweating. Mild pain drugs may help.
    • Nervous and excitable.
    • Headache.
    • Belly pain.
    • Upset stomach or throwing up. Many small meals, good mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.
    • Nose stuffiness.


    • Change in the health problem being treated. Is it better, worse, or about the same?
    • Follow up with the doctor.

    Contact a healthcare provider

    • If you think there was an overdose, call your local poison control center or ER right away.
    • Signs of a very bad reaction to the drug. These include wheezing; chest tightness; fever; itching; bad cough; blue or gray skin color; seizures; or swelling of face, lips, tongue, or throat.
    • Signs of low mood (depression), thoughts of killing yourself, nervousness, emotional ups and downs, thinking that is not normal, anxiety, or lack of interest in life.
    • Trouble breathing.
    • Cough that does not go away.
    • Use of short-acting puffer (inhaler) more often.
    • Numbness or tingling in your hands or feet.
    • Dark urine or yellow skin or eyes.
    • Not able to eat.
    • Change in the way you act.
    • Any skin change.
    • Any rash.
    • Side effect or health problem is not better or you are feeling worse.

    General Statements

    • If you have a very bad allergy, wear an allergy ID at all times.
    • Do not share your drugs with others and do not take anyone else's drugs.
    • Keep all drugs out of the reach of children and pets.
    • Most drugs may be thrown away in household trash after mixing with coffee grounds or kitty litter and sealing in a plastic bag.
    • In Canada, take any unused drugs to the pharmacy. Also, visit to learn about the right way to get rid of unused drugs.
    • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
    • Call your doctor for help with any side effects. If in the U.S., you may also call the FDA at 1-800-FDA-1088 or if in Canada, you may also call Health Canada's Vigilance Program at 1-866-234-2345.
    • Talk with the doctor before starting any new drug, including OTC, natural products, or vitamins.

    Author information
    • Copyright © 1978-2013 Lexi-Comp Inc. All rights reserved.

    Copyright © 2011 Natural Standard (

    The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

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