Xopenex (Levalbuterol) is a bronchodilator prevents and treats chest tightness, shortness of breath, troubled breathing and wheezing associated with bronchospasm. It relaxes the muscles in the walls of the airways leading to the lungs. It allows the airways to expand to allow more air to flow freely in and out of the lungs. Is is primarily prescribed for lung condititions such as asthma, chronic obstructive pulmonary disease (COPD), chronic bronchitis, emphysema, lung infections, acute bronchitis among other conditions. This medication can be administered using a nebulizer or a hand-held inhaler. Also, levalbuterol can be subtituted for low dose of albuterol.