Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.

http://www.dailystrength.org/c/Bipolar-Disorder/forum/Treatments/19106817-lithium-orotate-facts-and-myths
It's highly toxic, IMO it should be a last resort. But I know people for whom it is the only medication that helps.
Bottom line - it's either useless or it's like medical lithium and it is potentially highly toxic - especially as the levels of purity are nothing like that required in medical lithium and theefore you can get wildly differing doses.
It's explained in detail in the thread.
If you are taking meds not prescribed by your doctor you need to let them know