Singulair (generic: montelukast) is a prescription medication used to treat asthma, exercise-induced bronchoconstriction, and allergic rhinitis.

Singulair belongs to a group of drugs called leukotriene receptor blockers, and works by stopping the immune system from causing breathing and allergy problems.

This medication comes in tablet, chewable and granule form.  It is usually taken once daily with or without food.

Common side effects include upset stomach, headache, and sore throat.