I was very thirsty when I was on lithium (900mgs IRRC). It also made me a bit zombie-ish. I had to come off it because I had no energy or motivation and was in my final teaching internship but it did help get me stable when I was on it. My doc was ok with me coming off and being a little hypomanic since it helped with getting stuff done for school and he monitored me closely to make sure it didnt get out of hand.