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NCI Dictionary of Cancer Terms


Singulair  listen  (SING-yoo-layr)

  A drug used to treat symptoms of asthma, such as trouble breathing, tight chest, wheezing, coughing, and runny nose. Singulair blocks the action of a substance that causes airways in the lungs to narrow and causes other symptoms of asthma. It is a type of leukotriene receptor antagonist and a type of antiasthmatic agent. Also called montelukast sodium.