I know I drink more caffeine than I should, but I could be worse. I drink about one 8-oz cup of American style coffee in the morning (sometimes maybe one and half), then maybe a tall glass of iced tea or Coke Zero and/or an espresso in the afternoon. Then maybe another 2-oz espresso after dinner. So, usually three to four servings per day. When I took Lithium, I drank a bit less. Usually I'm fine, I guess, but sometimes my heart can race a little or I feel caffeine-style would up. If it's notable, I stop drinking caffeine for the day and occasionally take an Ativan. With my Seroquel, an evening espresso doesn't really keep me up.