I agree with cln's response above, but in my case I don't find caffeine consumption too disturbing to my bipolar disorder, depending on when and how much is consumed. I think there are factors to consider, such as the medications one is on. For example, Lithium's effectiveness can be affected with caffeine consumption, when the caffeine is consumed, and the amounts all at one time. I also think some people are just more sensitive to certain substances than others.

I drink about 2-3 servings of caffeinated beverages each day, usually in the form of a morning cup of coffee, a mid-day or evening single espresso, and maybe a mid-day or evening glass of homemade iced tea, which isn't that high in caffeine. Spreading out like that is OK for me. I'm not taking Lithium right now, and I'm not overly sensitive to caffeine unless I consume too much in one sitting.

I'd try seeing if you do better with less, but if you're on Lithium I'd not make any major changes to the amounts. The best thing is to talk to your prescriber about your consumption, especially if on Lithium.