Adult Medication

Brand Names: US


Brand Names: Canada

ACH-Montelukast; Apo-Montelukast; Auro-Montelukast; Auro-Montelukast Chewable Tablets; Dom-Montelukast; Dom-Montelukast FC; Jamp-Montelukast; Mar-Montelukast; Mint-Montelukast; Montelukast Sodium Tablets; Mylan-Montelukast; PMS-Montelukast; PMS-Montelukast FC; RAN-Montelukast; Riva-Montelukast FC; Sandoz-Montelukast; Sandoz-Montelukast Granules; Singulair; Teva-Montelukast

What is this drug used for?

  • It is used to ease allergy signs.
  • It is used to prevent exercise-induced breathing problems.
  • It is used to treat or prevent asthma.
  • It may be given to you for other reasons. Talk with the doctor.

What do I need to tell my doctor BEFORE I take this drug?

  • If you have an allergy to montelukast or any other part of this drug.
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
This drug may interact with other drugs or health problems.
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this drug with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take this drug?

All products:

  • Tell all of your health care providers that you take this drug. This includes your doctors, nurses, pharmacists, and dentists.
  • Call your doctor right away if your normal dose does not work as well or if you need to use your inhaler more often.
  • This drug is not helpful during an asthma attack.
  • Do not use this drug to treat an asthma attack. Use a rescue inhaler. Talk with your doctor.
  • Do not use this drug to stop exercise-induced breathing problems if you are already using it for asthma or allergy.
  • If you have asthma and taking aspirin makes it worse, keep avoiding aspirin and NSAIDs while you take this drug.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using this drug while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

Chewable tablet:

  • If you have phenylketonuria (PKU), talk with your doctor. Some products have phenylalanine.

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.
  • Signs of a pancreas problem (pancreatitis) like very bad stomach pain, very bad back pain, or very bad upset stomach or throwing up.
  • 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.
  • Hallucinations (seeing or hearing things that are not there).
  • Change in how you act.
  • Memory problems or loss.
  • Feeling confused.
  • Not able to focus.
  • Bad dreams.
  • Not able to sleep.
  • Sleepwalking.
  • Shakiness.
  • Seizures.
  • Trouble breathing that is new or worse.
  • Fever.
  • Flu-like signs.
  • Sinus pain.
  • Chest pain.
  • A heartbeat that does not feel normal.
  • Any unexplained bruising or bleeding.
  • A burning, numbness, or tingling feeling that is not normal.
  • Ear pain.
  • A very bad skin reaction (Stevens-Johnson syndrome/toxic epidermal necrolysis) may happen. It can cause very bad health problems that may not go away, and sometimes death. Get medical help right away if you have signs like red, swollen, blistered, or peeling skin (with or without fever); red or irritated eyes; or sores in your mouth, throat, nose, or eyes.

What are some other side effects of this drug?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
  • Cough.
  • Loose stools (diarrhea).
  • Headache.
  • Sore throat.
  • Belly pain.
  • Stuffy nose.
  • Runny nose.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to your national health agency.

How is this drug best taken?

Use this drug as ordered by your doctor. Read all information given to you. Follow all instructions closely.

All products:

  • Take with or without food.
  • Take even during sign-free periods.
  • If working out or playing sports causes signs, use at least 2 hours before doing it.
  • If this drug is for asthma, take in the evening.
  • To gain the most benefit, do not miss doses.
  • Take this drug at the same time of day.
  • Keep taking this drug as you have been told by your doctor or other health care provider, even if you feel well.

Chewable tablet:

  • Chew well before swallowing.


  • Granules may be taken by mouth or mixed with applesauce, baby formula, breast milk, carrots, rice, or ice cream. Do not mix granules in other liquids.
  • After mixing, take your dose right away. Do not store for future use.

What do I do if I miss a dose?

  • Skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.

How do I store and/or throw out this drug?

All products:

  • Store at room temperature.
  • Protect from light.
  • Store in a dry place. Do not store in a bathroom.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Check with your pharmacist about how to throw out unused drugs.


  • Use granules right after opening.

General drug facts

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else’s drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Some drugs may have another patient information leaflet. If you have any questions about this drug, please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Consumer Information Use and Disclaimer

This information should not be used to decide whether or not to take this medicine or any other medicine. Only the healthcare provider has the knowledge and training to decide which medicines are right for a specific patient. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from the healthcare provider. You must talk with the healthcare provider for complete information about the risks and benefits of using this medicine.

Last Reviewed Date



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