because it is only a partial agonist
of MU opiate receptors, and because its secondary
effects are that
of anti depressants
in which it effects the reuptake of certain chemicals. However, make no false assumptions, it is an opoid medication.
It is not a scheduled narcotic and until recently, many doctors, websites, ect considered it to be an anaglesic althernative to opoid mdications. Although now days, it is slowly being listed as a narcotic or alteast an opoid medication.