And it is a stimulant as well. It works on the Dopamine system, unlike other anti-depressants, which primarily
work on the Nor-epinephrine and/or Serotonin systems. That's why the word, 'atypical'. Dopamine is an excitatory neurotransmitter (a stimulant).
Bupropion does help with mild to moderate levels of anxiety, but it is not known to more beneficial than the typical anti-depressants when the anxiety is severe.