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Medications and Drugs

Brand Names: Singulair

Generic Name: montelukast (Pronunciation: mon te LOO kast)

What is montelukast (Singulair)?

Montelukast is a leukotriene (loo-koe-TRY-een) inhibitor. Leukotrienes are chemicals your body releases when you breathe in an allergen (such as pollen). These chemicals cause swelling in your lungs and tightening of the muscles around your airways, which can result in asthma symptoms.

Montelukast is used to prevent asthma attacks in adults and children as young as 12 months old. It is also used to relieve runny nose and sneezing caused by allergies in adults and children as young as 6 months old.

Do not give this medication to a child without a doctor's advice.

Montelukast is also used to prevent exercise-induced bronchoconstriction (narrowing of the air passages in the lungs) in adults and teenagers who are at least 15 years old and are not already taking this medicine for other conditions.

Montelukast may also be used for purposes not listed in this medication guide.

Singulair 10 mg

square, beige, imprinted with SINGULAIR, MRK 117

Singulair 4 mg chewable

oval, pink, cherry, imprinted with SINGULAIR, MRK 711

Singulair 5 mg

round, pink, cherry, imprinted with SINGULAIR, MRK 275

What are the possible side effects of montelukast (Singulair)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any of these serious side effects:

  • skin rash, bruising, severe tingling, numbness, pain, muscle weakness;
  • mood or behavior changes, anxiety, depression, or thoughts about suicide or hurting yourself;
  • tremors or shaking;
  • easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin;
  • severe sinus pain, swelling, or irritation; or
  • worsening asthma symptoms.

Less serious side effects may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about montelukast (Singulair)?

Montelukast will not work fast enough to treat an asthma attack that has already begun. Use only a fast-acting inhalation medicine to treat an asthma attack. Talk with your doctor if any of your asthma medications do not seem to work as well in treating or preventing attacks.

It may take up to several weeks before your symptoms improve. Keep using the medication as directed and tell your doctor if your symptoms do not improve after several weeks of treatment.

Call your doctor right away if you feel that this medicine is not working as well as usual, or if it makes your condition worse. If it seems like you need to use more of any of your medications in a 24-hour period, talk with your doctor.

Call your doctor at once if you have any mood or behavior changes, anxiety, depression, or thoughts about suicide or hurting yourself.



Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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