I took neurontin for 4 days at the lowest dose (for fibro and neuropathic pain) and I became severely suicidal - to the point that I'm really not sure what stopped me. After being off the medications for 3 or 4 days, it went away.
My GP's response (and I really like my GP)? I should see a psychiatrist and she wanted to try Lyrica. Lyrica is the next generation of neurontin. I told her that I would only try it if someone could stay with me 24/7 for at least a week. And what would a psychiatrist do? Tell me to stop taking it? Fortunately, my mom was with me at that appointment and let the doctor know that I wasn't depressed, that it was the medication, and that she knows the difference. Nipped that in the bud. It really stinks when you have a hx of depression and they just automatically tie things up into that bundle.
However, I do wonderfully on Lamictal.