Lithium
"I have been on lithium for 14 years. I take 2100 mg a day and almost all of my suicidal obsessions have gone away. It controls most of my mania but only puts a small dent in the depression. If I miss a dose I will start into mania, so don't miss doses. The only side effect I have is tremor. I take 3 other psych meds and have always been amazed how clear headed I usually am on lithium."