Answer:
Drinking while taking Wellbutrin isn't dangerous per se - Wellbutrin just amplifies the effects of alcohol. I take Wellbutrin and drink and nothing bad has happened to me, but I do need to drink less. If you're still concerned, Wellbutrin has a half-life of ~21 hours, so it will be mostly cleared from your body in 2 or 3 days.
I haven't found any difficulties with drinking alcohol on Wellbutrin, although I am only on 150 mg daily. I've read that it increases risk of seizures, which is higher with Wellbutrin as it is. Just be careful about how much you drink, I would say, or even better -- ask your doctor.
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I believe that the above information is incorrect. My pharmacist told me and I've read online that when you drink alcohol while on wellbutrin it empties the stores of wellbutrin that youre body/brain has accumulated since you started. Many people go into wellbutrin withdrawal after they drink and feel really bad for days or weeks. Ive been through it, its HORRIBLE.