Controller medications are a type of medication used to manage chronic conditions, such as asthma or chronic obstructive pulmonary disease (COPD). They work by reducing inflammation and preventing symptoms, allowing individuals to maintain better control over their condition. These medications are typically taken daily, even when symptoms are not present, to help prevent flare-ups. Common types of controller medications include inhaled corticosteroids, long-acting beta-agonists, and leukotriene modifiers. Unlike rescue medications, which provide quick relief during an acute episode, controller medications focus on long-term management and improving overall lung function. Regular use can lead to fewer symptoms and a better quality of life.