Leukotriene inhibitors (also called leukotriene receptor antagonists or leukotriene modifiers) are oral medications that block the action of leukotrienes—inflammatory mediators involved in bronchoconstriction, mucus production, and airway edema. Key drugs include montelukast (Singulair – dominant), zafirlukast (Accolate), and zileuton (Zyflo – 5-lipoxygenase inhibitor). These...