Generics US generics drugmaker Watson Pharmaceuticals NYSE: WPI) has confirmed that its subsidiary, Watson Laboratories filed an Abbreviated New Drug Application) with the US Food and Drug Administration seeking approval to market levalbuterol tartrate inhalation aerosol, a generic version of Sunovion Pharmaceuticals, Xopenox HFA which is indicated for the treatment or prevention of bronchospasm in adults, adolescents, and children four years of age and older with reversible obstructive airway disease. 31 July 2012