I was on 10 mg for awhile and it stopped working optimally. My doctor took it up to 20 mg and it's doing a much better job. But antidepressants are a crap shoot. Some work for one person and not another. If it isn't working (or you are having intolerable side effects) tell your doctor you want to try something else. There are bunches of choices and it may take a while to find one that works for you. I've been on antidepressants for years, and my experience is it works until it doesn't - all of sudden your body says, "Nope, done with this one." and you have to find something else. Good luck.