"in my experience i have most often taken the bupropion xl tablet that is oblong; and that is one that i have absolutely little to none side effects that i actually notice. however, when i got my refill from the pharmacy a few days ago, they filled half of the bupropion prescription bottle up with the normal oblong ones (on the bottom) and the strange round ones at the top. i had to actually research what the inscription on the pill meant to make sure that there hadn&#039;t been some sort of mistake. anyway, i immediately noticed after taking this round type pill that i feel a &#039;&#039;buzzy&#039;&#039; sensation in my head that is very hard to explain. it is very disconcerting."