what is zyflo
Zyflo Â® (zileuton) is a prescription medication used to prevent asthma attacks in adults and children as young as 12 years old.yflo is part of a group of medications called leukotriene synthesis inhibitors. Leukotrienes are chemicals produced by the body in response to allergens or other problems. In the lungs, leukotrienes cause swelling and inflammation in the airways and constriction of the muscles of the respiratory tract.