Xopenex— Levosalbutamol (INN) or levalbuterol (USAN), trade name Xopenex, is the R-enantiomer of the short-acting β2-adrenergic receptor agonist salbutamol.  As a bronchodilator, it is used to treat asthma and chronic obstructive pulmonary disease (COPD).

Xopenex is used by many people as a substitute for Albuterol.

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