NCIt definition : A synthetic derivative of hydroxyurea with antiasthmatic properties. The leukotriene
inhibitor zileuton blocks 5-lipoxygenase, which catalyzes the formation of leukotrienes
from arachidonic acid; causes bronchodilation; decreases bronchial mucous secretion
and edema; and may prevent or decrease the symptoms of asthma. (NCI04);
Alternative definition : NCI-GLOSS: A substance that is used to prevent asthma symptoms and that is being studied
in the prevention of lung cancer. It belongs to the family of drugs called leukotriene
blockers.;