paxil is the ssri most known for weight gain - it's been called 'pack it on paxil.' if the newer version, paxil cr, is still available, it usually doesn't cause weight gain; some even lose on it.prozac, still known as the gold standard ad, is the ssri with the least weight-gaining potential for most. some few do gain on it.some lose on effexor xr, an snri, but many have trouble coming off of it, as they do with paxil. never stop paxil cold turkey! after titrating paxil down, you can start prozac back up at 10-20 mg at the end, and you should be fine.wellbutrin is the only ad (almost) guaranteed to not cause weight gain - most lose - BUT - if you have anxiety, most docs know to never prescribe it. it's way to stimulating for many. good luck.