Reboxetine, sold under the brand name Edronax, is a drug marketed as a treatment for, , and Panic Disorder amongst others
It is said to work as a norepinephrine reuptake inhibitor (NRI) with special sensitivity for the norepinephrine transporter (NET).
Like, an exact mechanism of action has not been found.
Despite widespread efforts to understand the mechanisms of action of antidepressant drugs, the requisite changes in neural function that underlie their therapeutic effects remain unclear. […] However, taken together with previous findings that chronic administration of fluoxetine also results in enhanced activation of LC neurons to a stressor (Page and Abercrombie 1997), our present findings suggest a possible shared mechanistic link between two distinct classes of antidepressant compounds. The exact nature of the mechanism remains unclear but it is likely to rely on the sensitivity of the noradrenergic system to stressors. Source: Nature
Note: A 2010 German study determined that Reboxetine works no better than a placebo.