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Why it's used

Montelukast is used to prevent asthma and exercise-induced narrowing of the muscles in the lungs. It is a prescription medicine. This medicine works by blocking the action of certain chemicals in the lungs. Montelukast is also used to relieve seasonal allergies such as irritation in the eyes, a runny nose and a sore throat. This medicine works by preventing the release of certain substances from the nose, which are responsible for allergic conditions. It is also used to treat indoor and outdoor allergies that are present throughout the year.
When not to use
Montelukast should not be used to treat an asthma attack.
Leukotriene Receptor Antagonists
Montelukast is a prescription medicine that belongs to a class of medicines called Leukotriene Receptor Antagonists. Leukotriene receptor antagonists treat and prevent inflamed, narrow and swollen airways that cause difficulty in breathing.

How to use

Read the medicine guide provided by your pharmacist, your doctor, or the medicine company. If you have any questions related to Montelukast, ask your doctor or pharmacist. Use Montelukast as per the instructions provided by your doctor.
Montelukast is eaten with or without food. If you mix this medicine with food, baby formula, or breast milk, use the mixture within 15 minutes. Do not store the mixture for future use. If using oral granules for children, this medicine should not be mixed with any liquid drink other than baby formula or with breast milk. Montelukast is eaten usually in the evening for asthma.

Typical Dosage

The typical dose of Montelukast for adults is 10 mg once a day. The usual dose for children is 4 mg to 5 mg once a day. Montelukast is commonly used at the same time every day. This medicine is not known to be addictive or habit-forming.
This medicine is to be used for longer periods of time. Montelukast is prescribed for the long-term treatment of asthma in adults and children aging 12 months and older. Montelukast should be used as directed by the doctor even if you feel well, or even if you think that there is no need for you to use your medicine.
If you are using the chewable tablet form of this medicine, make sure you chew the medicine before you swallow it.

Talk to Your Doctor

Discuss with your doctor if your condition persists or worsens or if you develop new symptoms. Discuss with your doctor if you have numbness of arms, numbness of legs, flu-like illness, rash, and pain or swelling of the sinus. Consult with your doctor before stopping the use of Montelukast.
Your doctor may prescribe a lower starting dose of this medicine to understand the impact on the body. Please follow your doctor's recommendations. Taking a higher dose of this medicine may increase the risk of side-effects. A lower dose of this medicine may be recommended to reduce the risk of side-effects. Older patients may see an increase in the incidence of side-effects. As a result, a lower dose may be recommended for older patients.

Use in Children

If you are giving Montelukast to a child, be sure to use a product that is for use in children. Use the child's weight or age to find the right dose from the product package or medicine label. You can also read the dosage section of this page to know the correct dose for your child. Else, consult with your doctor and follow their recommendation.
Medicines may be recommended for uses other than those listed in the medicine guide. You should not use Montelukast for conditions or symptoms for which it was not prescribed. Do not give Montelukast to other people, even if they have the same conditions or symptoms that you have. The use of this medicine without the advice of a doctor may cause harm.

Storage

Follow storage instructions on the product package if available. Store Montelukast at 15-30°C (59-86°F), away from moisture, and away from light. Store this medicine away from children and pets.
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How to take Montelukast

Your dose may depend on several personal factors. You should consult with your doctor to find out the dose that is best for you. The dose of Montelukast depends on the following factors:
  • patient's age
  • patient's health
  • medicines recommended by your doctor
  • any other medicines in use

Montelukast Dosage

Dosage for asthma

Adult (adults and children over 14 years)
  • Recommended: 10 mg by mouth per day once in the evening
  • Maximum: 10 mg per day
Children (2-5 years using a chewable tablet or oral granules)
  • Recommended: 4 mg per day
  • Maximum: 4 mg per day
Children (6-14 years using a chewable tablet)
  • Recommended: 5 mg per day
  • Maximum: 5 mg per day
Children (12-23 months of age using oral granules)
  • Recommended: 4 mg per day
  • Maximum: 4 mg per day

Dosage for narrowing of the muscles in the lungs due to exercise

Adult (adults and young adults)
  • Recommended: 10 mg per day at least two hours before exercise
  • Maximum: 10 mg per day
Children (6-14 years)
  • Recommended: 5 mg per day chewable tablet at least 2 hours before exercise
  • Maximum: 5 mg per day

Dosage for seasonal allergies

Adult (adults and children 15 years or older)
  • Recommended: 10 mg orally per day in the morning or evening
  • Maximum: 10 mg per day
Children (2-5 years)
  • Maximum: 4 mg per day in the morning or evening
Children
  • Recommended: 5 mg per day in the morning or evening
  • Maximum: 6-14 years

Dosage for asthma and seasonal allergies

Adult
  • Recommended: 10 mg a day as a single dose in the evening

Minimum Age

6 months

Dosage calculation for children

To calculate the dosage for children please use the weight based dose calculator to calculate the appropriate dosage as per the weight of your child.

Forms

Film-Coated Tablets
Strength: 4 mg, 5 mg, 10 mg
Chewable Tablets
Strength: 4 mg, 5 mg, 10 mg
Granules
Strength: 4 mg

Special Instructions

Oral formulation
Take once daily with or without food.
Asthma and seasonal allergies
Patients with both asthma and allergic response with irritation in the eyes, a runny nose and a sore throat should take only one dose of this medicine daily in the evening.
Asthma and narrowing of the muscles in the lungs due to exercise
Patients who are already taking this medicine for asthma should not take another dose for the narrowing of the muscles in the lungs due to exercise in a single day.
Acute asthma attack
Patients who need quick relief from an acute asthma attack should not take Montelukast.

Missed Dose

Take the next dose at the regular time but do not take two doses at the same time.

Overdose

What to do if you overdose on Montelukast?
In case of overdose, supportive measures should be employed, for example, removal of the medicine from the digestive tract, monitoring and therapy.
Symptoms of an overdose of Montelukast
If you use too much of this medicine, it could lead to dangerous levels of the medicine in your body. In such cases, symptoms of an overdose may include:
  • headache
  • restlessness
  • sleepiness
  • stomach ache
  • thirst
  • vomiting
If you think you have overdosed on Montelukast, call a poison control center immediately. You can look up the poison control center information from the Poison Center Finder at TabletWise.com.

Precautions while using Montelukast

Before you use Montelukast, tell your doctor of your medical and health history including the following:
  • a birth defect that causes an abnormal build-up of an amino acid in the body (called phenylketonuria)
  • mental disorders
  • sensitivity to aspirin
People with a history of phenylketonuria, mental disorders, and sensitivity to aspirin should be monitored as the use of medicine may result in further significant side effects.
Before you use Montelukast, tell your doctor if you are allergic to it or its ingredients. Your doctor may prescribe an alternative medicine and update your medical records to record this information. Discuss with your doctor if you are allergic to aspirin.
The use of this medicine may change blood vessel walls. This can happen in people with asthma who take Montelukast along with steroids through the mouth. You may have an inflammation of blood vessel walls called as systemic vasculitis.
The use of Montelukast may change white blood cells (eosinophils). For people with asthma who take this medicine along with steroids through the mouth, it can result in an increase in their count of white blood cells.

Use when Pregnant

Montelukast should be used only when required in patients who are pregnant or planning to become pregnant. It is unknown if this medicine is safe to use during pregnancy.

If Breastfeeding

Consult with your doctor on the use of Montelukast during breastfeeding. It is unknown if this medicine passes into breast milk, but caution should be used when given to mothers who are breastfeeding.

If trying to Conceive

Montelukast may impact fertility in women. If you are trying to conceive, discuss with your doctor on the use of this medicine. Montelukast may not be right for patients who are pregnant or planning to become pregnant as it may have a negative impact on their ability to have a baby.

Alcohol

Consult with your doctor if you can drink alcohol while using Montelukast.

Seizures

Montelukast can make you feel sleepy. Be careful, especially while driving, while using heavy machinery, or when doing any activity that needs you to be completely alert. The consumption of alcohol with Montelukast can worsen the sleepiness. Montelukast may cause seizures in some people. Hence, you should discuss with your doctor before performing any activities where a loss of consciousness may cause harm to you or others.

Increase in Risk

Montelukast may cause a lung infection, also known as, upper respiratory infection.

Montelukast Side-effects

The following side-effects may commonly occur when using Montelukast. If any of these side-effects worsen or last for a long time, you should consult with your doctor:
The following side-effects may commonly occur in children when using Montelukast. Discuss with your doctor if any of these side-effects last for a long time or are severe:
Rarely, the use of Montelukast may cause the following side-effects:
The following severe side-effects may also occur when using Montelukast:
Your doctor has prescribed Montelukast because they judge that the benefit is greater than the risk posed by side-effects. Many people using this medicine do not have serious side-effects. This page does not list all possible side-effects of Montelukast.
If you experience side-effects or notice other side-effects not listed above, contact your doctor for medical advice. You may also report side-effects to your local food and drug administration authority. You can look up the drug authority contact information from the Drug Authority Finder at TabletWise.com.

Warnings

Lapp Lactase Deficiency

Patients with Lapp lactase deficiency are at an increased risk when using this medicine. This medicine should not be used in patients with Lapp lactase deficiency.

Acute Asthma Attacks

This medicine should not be used as a medicine for acute asthma attacks. Patients should carry appropriate emergency medicines after consulting their doctor. Commonly, Albuterol, Levalbuterol, Metaproterenol, and Terbutaline are used for quick-relief medicines for acute asthma attacks. You should consult with your doctor for the best medicine as per your medical condition.

Use with Corticosteroids

Do not abruptly substitute the use of corticosteroid medicine with Montelukast. It may lead to high white blood cell count, rashes on the legs, shortness of breath, dizziness, issues with the functioning of the heart, and issues with the nerves of the hands and feet.

Aspirin Sensitivity

Patients with aspirin sensitivity should avoid aspirin as well as the use of other nonsteroidal anti-inflammatory drugs (NSAID) when using Montelukast.

Mental Disorders

Adults and children using Montelukast have reported agitation, aggressive behavior or hostility, anxiousness, depression, disorientation, dream abnormalities, hallucinations, insomnia, irritability, restlessness, somnambulism, suicidal thinking and behavior (including suicide), and tremor. Patients should alert their doctor if any of these events occur.

Interactions with Montelukast

When two or more medicines are taken together, it can change how the medicines work and increase the risk of side-effects. In medical terms, this is called as a Drug Interaction.
This page does not contain all the possible interactions of Montelukast. Share a list of all medicines that you use with your doctor and pharmacist. Do not start, stop, or change the dose of any medicines without the approval of your doctor.

Antibiotics

Montelukast interacts with rifampicin, which is a medicine used to treat bacterial infections including tuberculosis. The combined usage of these medicines will make Montelukast less effective. Precautions should be taken, particularly in children when using these medicines in combination with Montelukast.

Barbiturates

There may be an interaction of Montelukast with phenobarbital, which is a medicine used to treat insomnia and control seizures. The combined usage of these medicines will make Montelukast less effective. Precautions should be taken, particularly in children when using these medicines in combination with Montelukast.

Anti-Epileptic Drugs

Montelukast may interact with phenytoin, which is a medicine used to treat brain-related disorders such as seizures. The combined usage of these medicines will make Montelukast less effective. Precautions should be taken, particularly in children when using these medicines in combination with Montelukast.

Traveling With Medication

  • Ensure that you carry enough doses of each of your prescription medicines to last the entire trip. The best place to store your medicines is in the carry on baggage. However, while flying, if carrying liquid medicines, make sure you do not go over the limits imposed for carry-on liquids.
  • While traveling overseas, make sure that you can carry each of your prescription medicines legally to your destination country. One way to ensure this is by checking with your destination country's embassy or website.
  • Make sure that you carry each of your medicines in their original packaging, which should typically include your name and address, and the details of the prescribing doctor.
  • If your travel involves crossing time zones, and you are required to take your medicine as per a fixed schedule, make sure that you adjust for the change in time.

Expired Medication

Taking a single dose of expired Montelukast is unlikely to cause a side-effect. However, please discuss with your doctor or pharmacist, if you feel unwell or sick. An expired medicine may become ineffective in treating your prescribed conditions. To be on the safe side, it is important not to use an expired drug. You are much safer by always keeping a fresh supply of unexpired medicines.

Safe Disposal of Medication

  • If there are disposal instructions on the package, please follow the instructions.
  • If there are medicine take-back programs in your country, you should contact the respective authority to arrange for the disposal of the medicine. For example, in the USA, the Drug Enforcement Administration regularly hosts National Prescription Drug Take-Back events.
  • If there are no take-back programs, mix the medicine with dirt and place them in a sealed plastic bag. Throw the plastic bag in your household trash. Separately, remove all personal information including the prescription label from the medicine packaging and then dispose off the container.
  • If specifically indicated on the medicine package that it needs to be flushed down the toilet when no longer needed, perform the required step.

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