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Manufactured by Merck & Co, Singular is a leukotriene receptor antagonist that is prescribed to manage and control asthma and to prevent further asthma attacks. This drug is also prescribed to prevent bronchospasm induced by exercise and to treat seasonal allergies. Individuals using this drug should remember that this drug does not treat asthma attacks that have already begun. Patients are advised to take Singulair on regularly, even when there is no sign and symptoms of asthma. The intake of the drug should only be stopped after the doctor’s recommendation. Singulair is not known to show immediate effect on the patients and the effect of the drug can only be noticed after few weeks. Singulair has been approved by most of the drug regulatory authorities and is available in majority of the countries.

Follow important usage instructions given by doctors for getting the desired benefit of medication. Some of those instructions are:

  • Do not increase or decrease the dosage without doctor’s consultation
  • Swallow tablet as a whole with water
  • Chewable tablet need to chew properly before swallowing
  • Mix Oral granules of Singulair with rice, mashed carrots, etc., before swallowing
  • Oral granules need to consume within 15 minutes of opening and mixing it with liquid.
  • Irrespective of the fact there is an improvement in symptoms or not, patients are advice not to stop taking the drug without doctor’s consultation.
  • Take the drug same time every day.
  • This medicine does not treat acute asthmatic attacks.
  • Some patient may experience dizziness or drowsiness after taking this medicine, so they should avoid operating machinery or driving after administering it.

Singulair Dosage Instruction

Factors like age of patient, medical condition, and medical history are considered before recommending the dosage to patients.

The recommended dosage of Singulair for asthma is:

  • In adult and children 15 year and above, one 10 mg tablet taken every day
  • For children 6-14 years old, 5 mg tablet should be taken every day
  • For young children lying in the age group of 2-5 years old, 4mg tablet taken on daily basis.
  • For children 12-23 months old, one packet or oral granules taken one every day is recommended.

For exercise induced Bronchoconstriction, the recommended dosage is:

  • In adults and children 15 years and above, one 10 mg tablet taken every day. The dosage should be taken two hours before doing exercise.
  • For children 6-14 years, 5 mg chewable tablet is recommended two hours prior exercise.

For allergies, the recommended dosage is:

  • 10 mg tablet taken on daily basis for adults and children 15 years and above
  • One 5mg tablet taken on daily basis for children 6-14 years old
  • 4 mg chewable tablet or oral granules is recommended for children 2-5 years old.

Singulair Missed and Over dosage

If a patient misses the schedule dosage of Singulair then the patient can take it upon remembering. If time to take next dosage has arrived, one should skip the missed dosage and resume with normal dosing schedule. Do not take more than one dose in a day to compensate with missed dosage.

In case of over dosage, seek medical attention immediately or call at Poison help line number.

Singulair Storage

Store the drug at room temperature between 25 and 30 degree Celsius. Keep the drug away from reach of children and pets. Avoid exposure to heat, light and moisture.


It is prudent to be aware of important warnings and precautions which are associated with Singulair. If a patient is afflicted with other medical conditions, then the patient is advised to discuss this with their doctor to make sure that they are not contraindicated for Singulair therapy. The following conditions may be a contraindication for starting Singulair therapy:

  • Pregnant or breast-feedingl
  • Allergies to any food, dyes or preservativesl
  • Phenylketonurial
  • Liver diseasel
  • Patients are allergic to its ingredientsl
  • Suffering from galactose intolerancel

Side Effects

Like any other drug, some side-effects are also associated with Montelukast. Some of the common side-effects are:

  • Stomach pain, upset stomach
  • Nausea, diarrhea
  • Headache
  • Tooth pain
  • Sore throat, cough, hoarseness
  • Mild rash

When a patient experiences serious side-effects, it is important to report them to a doctor. Some of the serious side-effects are:

  • Allergic reaction like hives, swelling at throat, tongue, lips, etc.
  • Skin rash
  • Behavior changes, depression, anxiety
  • Tremors or shaking
  • Severe sinus pain, irritation or swelling
  • Worsening asthma symptoms
  • Severe skin reaction

Drug Interactions of Montelukast

Some drugs may interact with Montelukast. Thus, patients are advised to disclose all medications they are taking with their physician. If they are taking following medications, they should consult with doctor before starting this medication:

  • Rifampin
  • Phenobarbital

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November 4, 2022

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October 27, 2022

Great service! The pills arrived even faster than I expected.

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October 14, 2022

Your operators are always courteous and knowledgeable. Very good service.


October 13, 2022

I've been a Canadian Med Center customer for about 6 years now. In all that time there was never once that I considered taking my business elsewhere. They do a great job and the people they contract with are also super.


October 5, 2022

Cheaper and efficient.

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October 4, 2022

Always appreciate their prompt service but especially appreciate their hanging in there when there was difficulty getting my doctor to renew my prescription!

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