The present invention provides, inter alia, compositions containing enantiomerically pure (R)(+)-amisulpride or enantiomerically pure (R)(+)-sulpiride, optionally with dopamine receptor modulators. The present invention also provides compositions containing racemic (RS)-amisulpride or (RS)-sulpiride in combination with dopamine receptor modulators. Methods for preventing, treating, or ameliorating the effects of a metabolic disorder or key element thereof, for modulating blood glucose levels, and for preventing, treating, or ameliorating the effects of diabetes in a subject are also provided. Additionally, the present invention provides methods for counter-acting the dopamine antagonist activity of (S)-amisulpride in racemic (RS)-amisulpride, or the dopamine antagonist activity of (S)-sulpiride in racemic (RS)-sulpiride, administered to a subject to prevent, treat, or ameliorate the effects of a metabolic disorder.
