I am currently taking Lithium, 600 mg per day. I was on 900 per day, but my doctor decreased it due to some stomach issues that may or may not have been due to the Lithium-- I have stomach issues anyway, so it was hard to tell. I worked my way up very slowly, starting at 150 mg. My levels have always been good and out of the 15 psychiatric drugs I have tried, this was the only one that I got basically no side effects from. As far as the effectiveness, that's a whole other story for me.... My pattern and cycles of symptoms aren't what Lithium typically helps the best, but we decided to give it a try anyway. I am taking it along with Lexapro. Neither drug has done a great job so far... Throughout the years I've been pretty med-resistant anyway... I suspect that my days on Lithium will be ending soon just due to ineffectiveness. I wish you luck on it. Let me know if you have any other questions.