Budeprion and ulcer

Since being switched from Wellbutrin SR to a coated generic tablet and most recently to Budeprion, I have noticed an increase in stomach pain that did not change whether taken with food or on an empty stomach. At first it was only intermittent, but the last few months it has been chronic and I believed I was developing an ulcer. Before having the large endoscope pushed down my throat, I decided to stop the budeprion and so far the stomach pains have gone away. I am curently petitioning my prescription plan to at least come up with another generic source for bupropion SR besided Budeprion.