Interestingly enough, my response to coffee went WAY down after I got on bipolar meds (lithium, Lamictal, Abilify).

Now that I am on those meds, coffee makes me feel warm and a little "pumped up," but nowhere near the mood lift it used to provide. I finally quit it because it upset my stomach.

I still drink caffeine in diet soda. It does seem to give me some energy, but not like before.