It works by inhibiting the reuptake of dopamine, serotonin, and norepinephrine, an action which results in more dopamine, serotonin, and norepinephrine to transmit messages to other nerves. Bupropion is unique in that its major effect is on dopamine, an effect which is not shared by the selective serotonin reuptake inhibitors or SSRIs (e.g. paroxetine, Paxil; fluoxetine, Prozac; sertraline, Zoloft) or the tricyclic antidepressants or TCAs (e.g. amitriptyline, Elavil; imipramine, Tofranil; desipramine, Norpramin).
