I was diagnosed with bipolar disorder about 9 months ago and my first maniac episode (had two total) was two years ago.
I am on valproic acid now (1000 mg a day) and used to be on lithium.
Both cause me sleepiness and muscle/joint weakness.
Understand that lithium and valproic acid are the best mood stabilizers for bipolar disorder.
Have you experienced this or have ideas on other medication possible?