Neurontin will NOT make you fail a drug test...I just had a10 panel random test at my job and the only thing I was asked about was my benzos which was verified by my pharmacy. No mention of neurontin, and I passed!!!
No, it is not a narcotic at all. Whether there are cross reactions on a drug UA, I don't know but I do not believe it should show as one. Always list all your prescription drugs whenever you take a UA, to cover yourself.