Oxidopamine is a neurotoxin used by researchers to selectively kill dopaminergic and noradrenergic neurons. 6-OHDA enters the neurons via the dopamine and noradrenaline (norepinephrine) reuptake transporters. Oxidopamine is often used in conjunction with a selective noradrenaline reuptake inhibitor (such as desipramine) to selectively kill dopaminergic neurons only. The reverse is also possible, however it is rarely done in research.