just make sure your doctor orders blood tests for thyroid often. TSH (thyroid stimulating hormone) and free T4 (thyroxine). and make sure your salt has iodine in it, and try taking kelp caplets. drink tap water not bottled cuz it has iodine. iodine helps the thyroid function properly. thyroid is the major concern when taking lithium, other than lithium levels being too high and toxic.