I think there was a big study looking at adding either wellbutrin or buspar to SSRIs (the STAR study). I think they each helped about a third of the people. (Don't quote me on that.) So you just have to try and see if it helps. I think wellbutrin is often added if you need to be peppier or less zombie/lethargic/uncaring/unfeeling, like some people get on SSRIs. Wellbutrin is also sometimes added to counteract negative sexual side effects of SSRIs.

I started on Wellbutrin about 1 month ago (without an SSRI). I think I am still coming on to it, so it does take a while to reach full effect. We took quite a while to gradually increase the dose. If you are feeling no effect, maybe you need a higher dose.