IC50: 1.7 μM (Norepinephrine uptake)
nACh receptor

Plasma levels of Hydroxybupropion greatly exceed those of the parent drug, reaching 10 to 100 times the concentration of Bupropion. Hydroxybupropion shows stronger antitetrabenazine activity (indicative of an antidepressant activity in animals) and has a lower LD50 value than the erythro- and threo- metabolites, suggesting that Hydroxybupropion is the most important active metabolite in vivo for its antidepressant activity. Hydroxybupropion is pharmacologically active, inhibiting norepinephrine and dopamine uptake, and antagonizing nicotine and showing antidepressant effects in rodents.