Hiya DougB. I used to take 3600 mg/day and it didn't bother me at all. Also didn't help with the pain, which may not be relevant to your concerns. Anyway, I stopped taking it, then recently started again and found the side effects that you're describing with as little as 300 mg--it was making me loopy and barely able to function.

So you're not the only one who was once OK with it and now isn't. Is it helping your PN symptoms at all?

Thanks for pointing out the kidney function angle, mrsD...I will ask to have that looked at.