Xopenex HFA is a quick relief drug used to ease breathing problem for people suffering from asthma and severe pulmonary diseases. Xopenex is administered as a pressurized aerosol or inhaler and aids in relieving muscles and reopening breathing passages that allow air passage. Xopenex Hfa is a medicine used in the treatment of asthma and chronic obstructive pulmonary disease (COPD), but may be used for other purposes as determined by the prescriber. The active ingredient of the medicine - levosalbutamol - is a beta-2 agonist. This means that Xopenex Hfa works by widening the airways in the lungs, making it considerably easier for patients to breathe. Xopenex Hfa is administered through the inhalational route. This makes it easier to expose the drug to the entire surface area of the lungs, where beta-2 receptors lie. Common side effects with Xopenex Hfa include dry mouth, nausea, dry throat, sore throat, and difficulty sleeping.