I take Lithium and am going to give some different results than the above posters.
Nausea and dizziness for about 6wks-2 months that finally passed.
Confusion, extreme memory problems-unable to remember atm pin, where my purse was, better after 8 months. Could hardly work, had to have secretary help me.
Had to come home during the day and nap, tiredness.
Headaches-still have those. Loss of interest in sex-still have those.
Up side-very good stabilization of moods. Drink lots of water.
Hope you have better luck with it. PDoc won't change it as it is working.