What effect would caffeine stimulants have on a bipolar person?

Stimulants in general are tough with bipolar disorder, just like they say...what goes up must come down. So as it goes with bipolar, its better to maintain your level playing field. As you know its hard enough as it is. So what you can control... Coffee beverages are just as good decaf.(there is a small amount of caffeine, but not enough to jack you up.