Active Ingredient

Montelukast

Montelukast is a medication used to help manage and prevent symptoms associated with asthma and allergies. It is often prescribed to reduce inflammation and ease breathing difficulties.

It works by blocking substances in the body called leukotrienes, which are involved in causing asthma symptoms and allergic reactions.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Montelukast Brands

Montair

Strengths 10 mg

Singulair

Strengths 4mg, 5mg, 10mg

Montelukast Uses

Montelukast is commonly used for the prevention and long-term treatment of asthma and to relieve symptoms of allergies.

Prevention of asthma symptoms
Management of exercise-induced bronchoconstriction
Relief from seasonal allergic rhinitis (hay fever)
Relief from perennial allergic rhinitis

How Montelukast Works

Montelukast works by blocking leukotrienes, which are chemicals in the body that cause inflammation and constriction of airways. This helps to prevent asthma attacks and allergic reactions.

By inhibiting these substances, Montelukast helps to reduce swelling and inflammation in the airways, making it easier to breathe.

This action helps to control symptoms such as wheezing, coughing, and shortness of breath.

Common side effects of Montelukast

Not everyone experiences side effects from Montelukast, and many side effects are mild and temporary.

Headache
Stomach pain
Diarrhea
Upper respiratory infection
Fever
Cough
Sore throat

If you experience serious or persistent symptoms, contact your healthcare provider.

Frequently Asked Questions

What is Montelukast used for?

Montelukast is used to prevent asthma symptoms and to relieve symptoms of allergies such as sneezing and runny nose.

How does Montelukast work?

Montelukast works by blocking leukotrienes, which are chemicals that cause inflammation in the airways, helping to reduce symptoms of asthma and allergies.

Can Montelukast be used during an asthma attack?

No, Montelukast is not suitable for treating an acute asthma attack. It is used for prevention and long-term management.

Are there any common side effects of Montelukast?

Common side effects may include headache, stomach pain, and upper respiratory infections, but not everyone experiences them.

Can I take Montelukast with other medications?

You should inform your doctor about all medications you are taking to avoid potential interactions. Always follow your doctor’s advice.