Zafirlukast is a medication used to manage and prevent asthma symptoms. It works by blocking certain substances in the body called leukotrienes, which can cause inflammation and constriction of the airways. By reducing these effects, Zafirlukast helps improve breathing and decrease the frequency of asthma attacks. This drug is typically taken as a tablet and is often prescribed alongside other asthma treatments. It is important for patients to follow their healthcare provider's instructions and continue using their inhalers as needed, as Zafirlukast is not intended for immediate relief of asthma symptoms.