I was put on lithium in 2007 at age 14. The increased thirst was a nightmare. I spent all night drinking water to the point I was denied it for fear of water intoxication. I ended up wetting the bed one night. I was unbearably thirsty the entire time I was on it. Then in 2013 it started affecting my kidneys and I had to go off it. My kidney levels have still not gone down and the last time my blood was checked my levels actually had gone up a bit. Yeah lithium was not good for me but that was just my experience and I think my case is pretty unusual.