Levalbuterol HFA inhaler (Xopenex) is a bronchodilator used to treat or prevent bronchospasm in people with reversible obstructive airway diseases, such as asthma. It works by relaxing the muscles in the airways, allowing for easier breathing during asthma attacks or in cases of exercise-induced bronchospasm. Xopenex is typically used on an as-needed basis for rapid relief of symptoms.