Abstract: The present invention relates to (?)-1-(3,4-dichlorophenyl)-3-azabicyclo[3.1.0]hexane and pharmaceutically acceptable salts thereof, compositions comprising (?)-1-(3,4-dichlorophenyl)-3-azabicyclo[3.1.0]hexane or a pharmaceutically acceptable salt thereof, and methods for treating or preventing a disorder alleviated by inhibiting dopamine reuptake. In one embodiment, the disorder is attention-deficit disorder, depression, obesity, Parkinson's disease, a tic disorder, or an addictive disorder. The (?)-1-(3,4-dichlorophenyl)-3-azabicyclo[3.1.0]hexane or pharmaceutically acceptable salt thereof is preferably substantially free of its corresponding (+)-enantiomer.