What is montelukast?

Montelukast is the only leukotriene inhibitor approved by the Food and Drug Administration (FDA) to treat allergic rhinitis. Side effects include headache, dizziness, and stomach pain, as well as more serious neuropsychiatric symptoms, such as anxiety, agitation, hallucinations, depression, and suicidal behavior.

Montelukast is the name of the active ingredient in Singulair. It is used to prevent asthma attacks. It is also used to treat allergies and help prevent narrowing of the air passages caused by exercise, in people who are not already using this medication for other reasons. In people with asthma, allergens cause the body to release chemicals that swell the lungs and tighten muscles that surround the airways, making it difficult to breathe. Montelukast is a type of drug called a leukotriene inhibitor that reduces your body's reaction to inhaled allergens such as pollen. This medication comes in the form of tablets or granules that you take by mouth. The tablets should be swallowed whole, and the granules can be swallowed by themselves or mixed with a beverage or a food such as applesauce.

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