Anti-leukotrienes, or leukotriene inhibitors, prevent the swelling and inflammation of the air passages. Anti-leukotrienes are used to prevent asthma attacks, but are not useful for the treatment of an asthma attack.

• Leukotriene inhibitors:
• Zafirlukast (Accolate)
• Zileuton (Zyflo)
• Montelukast (Singulair)