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Montelukast is used to prevent and treat asthma, seasonal and year round allergies (hay fever), and prevent exercise-induced asthma.

How it works

Montelukast belong to a class of medicines called leukotriene receptor antagonist (anti-asthmatic drugs). It blocks the action of certain natural substances (leukotrienes) that are involved in causing asthma and allergies. It makes breathing easier by reducing swelling in the airways.

Common side effects

Abdominal cramp, Abdominal pain, Allergic reaction, Shortness of breath, Joint pain, Bloody nose, Chest tightness, Chest pain, Fatigue, Weakness, Headache, Increased sweating, Influenza like symptoms, Feeling of discomfort


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Expert advice

  • Do not take montelukast if you are allergic (hypersensitive) to montelukast or any of the other ingredients of montelukast.
  • Contact your doctor, if your asthma or breathing gets worse.
  • Montelukast is not meant to treat asthma attacks of short duration. If an attack occurs, it is advisable to always have your inhaled rescue medicine with you.
  • Take asthma medications prescribed only by doctor. Montelukast should not be substituted for other asthma medications your doctor has prescribed for you.
  • Consult your doctor if you get symptoms of flu-like illness, pins and needles or numbness of arms or legs, worsening of respiratory symptoms, and/or rash.
  • Consult your doctor before taking this drug if you are pregnant or breast feeding.

Frequently asked questions


Q. What are the uses of montelukast/ Montek Lc/ Romilast?
Montelukast (also available as Montek Lc/ Romilast) is used to prevent and treat asthma, seasonal allergies (hay fever), and prevent exercise-induced asthma.
Q. Is montelukast steroid/antibiotic?
No. Monteleukast is an leukotriene receptor antagonist which is used as an anti-asthmatic drugs.
Q. Is montelukast harmful?
Montelukast is safe if used at prescribed doses for the prescribed duration as advised by your doctor.
Q. Is montelukast gluten free?
Montelukast is gluten free. Please refer to package insert of the prescribed brand before use.

Content on this page was last updated on 28 September, 2016, by Dr. Varun Gupta (MD Pharmacology)