Effexor, Prozac, Lexapro, etc. Often the
gain was not instant, like with the older generation of meds. Took a year for one to put 50 lbs on me in a few months.
I also have been on Wellbutrin. It didn't help with depression, and increased anxiety to point where I had painful muscle spasms.
At 74, and after anal cancer treatment, the really awful side effect is non stop diarrhea, which almost landed me in the hospital in one case.