That depends on your manic phase really. If its mostly a depressive issue for you the dosage that you are on is therapeutic level for that. If you experience alot of mania then 200mg is the threshold for it. Also depends on other meds. For example, I take Xanax as well as Lamictal and Xanax is known to cause manic episodes so I stick to the 200mg per day.

hope this helps.