Personally — and this is just me — if a med helps me in any way, shape, or form, I like to keep it, even if it means adding more meds. For example, lamictal does NOTHING to stabilize my mood. NOTHING. However, it gets rid of my extreme agitation and it's the only thing that ever has, so I keep it. I'd rather not try another mood stabilizer like lithium, depakote, trileptal, etc and risk it failing me because then I'm worse off than before. I can take an antidepressant for the depression and an antipsychotic for the mania (and the psychosis outside of mood episodes).

So it's a risk vs reward thing, and I'm just not a risky person