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Medically Approved

Singulair dosage: A detailed guide

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Forms and strengthsDosageFAQHow it's takenCouponOverdoseAsk your doctorBoxed warning
Doctors prescribe Singulair for certain types of lung conditions, including asthma. You typically take it by mouth once per day.
Medically reviewed by Purva Singla, PharmD
Updated on December 6, 2023

This article describes Singulair’s dosages and strengths and gives details on how to take it. You’ll also find information on savings and coupon options for Singulair. If you want to know more about Singulair, see this overview article. It covers details about the drug’s uses, side effects, and more.

Singulair is a brand-name medication that comes as an oral tablet, chewable tablet, and oral granules. It’s available in a generic version called montelukast. This article describes dosages of Singulair.

Boxed warning: Risk of serious behavior or mood changes

Singulair has a boxed warning for the risk of serious behavior or mood changes. A boxed warning is the most serious warning from the Food and Drug Administration (FDA).

See the end of this article for more information about this boxed warning.

Forms and strengths of Singulair

Singulair comes in these forms and strengths:

FormHow to takeStrength
oral tabletswallow 10 milligrams (mg)
chewable tabletchew, then swallow• 4 mg
• 5 mg
oral granulesswallow or mix in specific liquids or soft foods*• 4 mg

* You may swallow the oral granules whole. Or you may dissolve them in or mix them with specific foods. See “How Singulair is taken” below for more information.

Dosage of Singulair

This article describes the recommended dosages for Singulair. The drugmaker provides these dosages.

If your doctor prescribes this medication, you should follow the dosage they prescribe. Your doctor will determine the dosage that best meets your needs. Do not change your dosage of Singulair without your doctor’s recommendation.

Usual recommended dosages of Singulair in adults

The Food and Drug Administration (FDA) has approved Singulair to:

  • treat and prevent asthma in adults and children ages 12 months and older
  • prevent exercise-induced bronchoconstriction (narrowing of the airways) in adults and children ages 6 years and older
  • treat seasonal allergies in adults and children ages 2 years and older
  • treat year-round allergies in adults and children ages 6 months and older

Usually, doctors start by prescribing a low dosage of Singulair. Then, they’ll adjust it over time until the right dosage is reached. Ultimately, your doctor will prescribe the smallest dosage of Singulair that gives the desired outcome.

The following table shows the recommended dosages of Singulair for adults in milligrams (mg).

ConditionFormRecommended dosage
asthmaoral tablet10 mg once every evening
exercise-induced bronchoconstrictionoral tablet10 mg once as a single dose at least 2 hours before exercise
seasonal allergies and year-round allergiesoral tablet10 mg once per day

Dosages of Singulair in children

The following table outlines the recommended dosages of Singulair for children by condition and age. The dosages are in milligrams (mg).

ConditionAgeFormRecommended dosage
asthma12–23 monthsoral granules4 mg (one packet) once every evening
asthma2–5 yearschewable tablet or oral granules4 mg once every evening
asthma6–14 yearschewable tablet5 mg once every evening
asthma15–17 yearsoral tablet10 mg once every evening
exercise-induced bronchoconstriction6–14 yearschewable tablet5 mg once as a single dose at least 2 hours before exercise
exercise-induced bronchoconstriction15–17 yearsoral tablet10 mg once as a single dose at least 2 hours before exercise
seasonal allergies and year-round allergies2–5 yearschewable tablet or oral granules4 mg once every evening
seasonal allergies and year-round allergies6–14 yearschewable tablet5 mg once every evening
seasonal allergies and year-round allergies15–17 yearsoral tablet10 mg once every evening
year-round allergies6–23 monthsoral granules4 mg (one packet) once every evening

Dosage adjustments for Singulair

Your doctor will prescribe a dosage of Singulair based on several factors. These include:

  • the specific condition being treated and how severe it is
  • your age
  • other health conditions you may have

Missed dose of Singulair

Talk with your doctor or pharmacist right away if you realize you forgot to take a dose of Singulair. They may advise you to take the missed dose. Or they may advise you to skip it and take your next dose as scheduled.

For tips on how to plan your doses of Singulair and avoid missing a dose, read this article. You could also try:

  • downloading a reminder app on your phone
  • setting an alarm
  • putting a note where you’ll see it, such as on your calendar, bathroom mirror, or bedside table

Frequently asked questions

Below are answers to some commonly asked questions about Singulair and its dosage.

Does Singulair have a 20-mg daily dosage?

No, it doesn’t. The highest recommended dosage of Singulair is 10 milligrams (mg) once per day.

Be sure to take Singulair exactly as prescribed. Taking doses higher than recommended can increase your risk of side effects.

To learn more about your daily dosage of Singulair, talk with your doctor.

For children, is Singulair’s dosage determined by weight?

No, it’s not. Your child’s doctor will prescribe a dosage of Singulair based on your child’s age, not weight.

If you have questions or concerns about your child’s Singulair dosage, discuss them with your doctor.

Is Singulair taken long term?

Yes, doctors typically prescribe Singulair as a long-term treatment. If you and your doctor determine that it’s safe and effective for your condition, you’ll likely take it long term.

Talk with your doctor if you have questions about how long you should take Singulair.

How Singulair is taken

If you’re taking Singulair oral tablet, you’ll swallow it whole once per day. If you’re taking Singulair chewable tablet, you’ll chew and then swallow it once per day. You can take either of these two forms with or without food.

Children should swallow Singulair oral granules whole. Or they may take them as follows:

  • dissolved in 1 teaspoon of baby formula or breast milk, which can be cold or room temperature
  • mixed with a spoonful of soft foods (only applesauce, carrots, rice, or ice cream), which can be cold or room temperature

Be sure to give the full dose of the granules to your child within 15 minutes after opening the packet. Your child can take the granules with or without additional food.

Your doctor may advise that this medication be taken around the same time each day. This helps keep a consistent amount of the drug in the body. And that can help the drug work more effectively.

If it’s hard for you to swallow tablets, view this article. It provides suggestions on how to swallow medications that come in pill form.

Also, be sure to talk with your doctor or pharmacist if your child or you are having difficulty taking the medication. They can offer recommendations about taking it.

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Overdose of Singulair

It’s important that you do not take more Singulair than your doctor prescribes. Doing so can lead to harmful effects.

What to do if you take too much Singulair

If you think you’ve taken too much Singulair, call your doctor or pharmacist right away. Or you could call 800-222-1222 to speak with someone at America’s Poison Centers. You can also use its online resource. If you have severe symptoms, call 911 or a local emergency number immediately. You can also go to the closest emergency room.

What to ask your doctor

This article describes the usual recommended dosages for Singulair. If your doctor prescribes this medication, they’ll determine the dosage that’s best for you.

Do not change your dosage of Singulair without your doctor’s recommendation. You should take Singulair exactly as your doctor prescribes it. Let your doctor know if you have concerns or questions about your treatment plan.

Here’s a list of some possible questions you may want to ask your doctor:

  • How long will I take Singulair?
  • Will my dosage of Singulair need to change if I take other drugs with it?
  • Which form of Singulair is best for my child?

Boxed warning for Singulair

Singulair has a boxed warning for the risk of serious behavior or mood changes. A boxed warning is the most serious warning from the Food and Drug Administration (FDA).

Singulair may increase the risk of serious behavior or mood changes. These include agitation, aggression, depression, sleep problems, and suicidal thoughts and behavior.

Due to this risk, your doctor will typically prescribe Singulair only if there aren’t any other treatment options available. If you or your loved ones notice any changes in your behavior or mood, stop taking Singulair and call your doctor right away.

If you have thoughts of suicide during Singulair treatment, call the Suicide and Crisis Lifeline by dialing 988. Or tell your doctor right away. You can also refer to this article for ways to get support.

Talk with your doctor to learn more about this boxed warning.

Disclaimer: Optum Perks has made every effort to make certain that all information is factually correct, comprehensive, and up to date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or another healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.

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