Does wellbutrin (bupropion) block the effects of xanax?

To a certain degree that is. Ive been on wellbutrin 200mg for the past 7 months. When me and me mates got a hold of some bars we all popped a schoolbus (2 mg aka alot) and they were all xaned out but i felt hardly nothin. i snorted another and stil a little but not much. The i took another drank and was gooooooooone. anyway do they block the effects of each other to a certain point? It took me 3 bars plus a bottle of wine which is an insane amount compared to most people. Anyway they both block anxiety so i was wonderin any pharmacist or pseudo pharmacist could explain this.