Based on its complex pharmacokinetics, your doctor should be recommending that you reduce your dosage by 100–150mg a day (for the more popular SR and XL forms, 75mg for the immediate
release form), every week if you need to stop taking
Wellbutrin, if not more slowly than that. There have been reports of more than the usual problems that come from stopping any med abruptly, or just too quickly."
Good luck.