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Singulair (Montelukast) is used for the treatment of asthma and seasonal allergic rhinitis.

Drug Name

Singulair (Montelukast)

Drug Uses

Montelukast is used for the treatment of asthma and seasonal allergic rhinitis. Montelukast begins working after 3 to 14 days of therapy. Therefore, it should not be used for the treatment of an acute asthmatic attack.

How Taken

The recommended dose of montelukast is 4, 5, or 10 mg daily. The 4 and 5 mg tablets are used in children. Montelukast should be taken in the evening with or without food.

Drug Class and Mechanism

Montelukast is an oral leukotriene receptor antagonist for the treatment of asthma and seasonal allergic rhinitis (hay fever). Leukotrienes are a group of naturally occurring chemicals in the body that promote inflammation in asthma and seasonal allergic rhinitis and in other diseases in which inflammation is important (such as allergy). They are formed by cells, released, and then bound to other cells, and it is the binding to these other cells that stimulates the cells to promote inflammation. Montelukast works in a manner similar to zafirlukast (Accolate), blocking the binding of some leukotrienes. Unlike zafirlukast, montelukast does not inhibit CYP2C9 or CYP3A4, two enzymes in the liver that are important in breaking down and eliminating many drugs. Therefore, unlike zafirlukast, montelukast is not expected to affect the elimination of other drugs. The safety and effectiveness of montelukast has been demonstrated in children as young as 6 months of age. It was approved by the FDA in 1998.

Missed Dose

Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and take the next regularly scheduled dose as directed. Do not take a double dose of this medication.


Tablets should be stored at room temperature, 15-30 degrees C (59-86 degrees F).