Been a long time since I've thought about this one. And I've never taken it myself. But I know a lot of people who have. Some say it is essential &/or vital to their well-being. I believe it is one of the more traditional medications for bipolar disorder (perhaps the first?). Anyway, they check you out before hand to make sure it's okay for you to get/have/take it. And then I believe they continue to do so at certain points going forward just to make sure nothing changes.