How can you tell if Wellbutrin XR pills have got old and are not safe to take? I have taken them off and on a few times over the years; they kept giving me anxiety, but recently my doc prescribed me gabapentin for anxiety and it's working so well. I decided I would give the Wellbutrin another shot. I broke one in half and it's kinda gooey inside... well... it's more like just the same texture all the way through, it's sort of strange. I've never cut one up before so I have nothing to go by from experience. Thanks in advance. Love this site.