Montelukast is a medication used to treat asthma and allergies.

It works by blocking leukotrienes, which are substances that play a role in the body's inflammatory response.

It helps relieve chest tightness, wheezing, shortness of breath, and other symptoms of bronchial asthma.

However, Montelukast is generally a well-tolerated medication, there are a few potential side-effects.

These include headaches, stomach pain, and diarrhea.

It's also important to watch out for symptoms like muscle aches, fever, rash, swollen glands in the neck or armpit area.

Montelukast is also used to treat seasonal allergies, exercise-induced asthma, and COPD.