The most common medications used to control asthma symptoms are inhaled corticosteroids, bronchodilators, and leukotriene modifiers. Inhaled corticosteroids reduce inflammation in the airways and help to prevent asthma attacks. Bronchodilators relax the airways, making it easier to breathe. Leukotriene modifiers reduce inflammation and help to reduce the frequency and severity of asthma attacks. Additionally, some people may require additional medications, such as mast cell stabilizers or immunomodulators, to help control their asthma symptoms.