hmmm ... I think I was taking 600mg twice a day. It's been a few years, so I can't remember too much.
It was given to me as a mood stabilizer, and we thought it would work better than Depakote because it has anti-anxiety effects as well. I think at one point I was taking Neurotin plus depakote.
But I just recently read reports that it's not that good for bipolar disorder. It's manly an anticonvulsant and pain regulator.
I don't really remember any bad side effects. But I was taking much less than you.
Like I said, I would abuse it now and then, but that didn't give me any negative side effects.