Please describe the medication: singulair (montelukast)?

Anti-inflammatory: It is an oral medicine. It belongs to a class of medications known as leukotriene receptor blockers. Leukotrienes are chemicals produced by white blood cells that cause inflammation and cause changes in the airway that lead to asthma. Blocking the leukotriene receptor is a very useful and effective way of controlling asthma. It is also useful in some forms of cough

Asthma/COPD: Singulair (montelukast) is generally used in cnjunction with inhaled rescue inhalers and controllers in people with asthma or copdit is classified as a leukotriene inhibitor.It is sometimes sued alone in those who cannot tolerate inhaled steroids as a controller.