My best friend has been taking lithium for a couple months now, and I was wondering if anybody knew exactly happens when somebody drinks caffeinated beverages while taking lithium. I know that it lowers the lithium level in your body, but I don't know much more than that. My friend's brother is studying to be a biochemist, and he speculates that the lithium may cause the caffeine to crystallize and be stored in the liver, which doesn't sound that great. Does anybody know anything about this?