Certain antidepressant medications act to raise noradrenaline, such as the SNRIs and the tricyclic antidepressants (TCAs). In other words, these medications prevent the noradrenaline transporter from doing its job. Noradrenaline therefore remains in the synapse longer, allowing it to reach more normal levels. Since the noradrenaline transporter is also thought to transport dopamine to some extent, SNRIs would also raise dopamine levels in the synapse.
"The involvement of the norepinephrine transporter (NET) in the pathophysiology and treatment of attention deficit hyperactivity disorder (ADHD), substance abuse, neurodegenerative disorders (e.g., Alzheimer's disease (AD) and Parkinson's disease (PD)) and clinical depression has long been recognized. 
The Ala457Pro rare missense mutation results in a loss of function and has been associated with orthostatic intolerance (associated with postural orthostatic tachycardia syndrome) in one kindred. Orthostatic intolerance is, however, not typically associated with the mutation.
An epigenetic mechanism (hypermethylation of CpG islands in the NET gene promoter region) that results in reduced expression of the noradrenaline transporter and consequently a phenotype of impaired neuronal reuptake of noradrenaline has been implicated in both postural orthostatic tachycardia syndrome and panic disorder.
Lack of association between the norepinephrine transporter gene and major depression in a Han Chinese population
Mar 01, 2007; Objective: Although the physiological mechanisms contributing to the development of major depression remain unclear, several...