I've been on it for several years for nerve pain. It has been, for the most part, effective. I am also on Cymbalta, also for nerve pain. These two meds, plus oxycodone, baclofen and nerve blocks provide considerable relief.
I am Neurontin for the second time. The first time I took it several years ago it worked well for my nerve pain. It's been my experience that it works rather soon but it does not work like a narcotic type drug. Your body needs to get to a certain blood level that works for you. So, if your are not getting relief by the end of 7 days , I would talk to your doc again.
I just started taking it again and have noticed some improvement in my pain. If the dose I was given wasn't enough, my neuro told me to call and he would increase the dosage.
A lot of people on the forum have had great success with Neurontin.
Ren
I am on Lyrica which is similar. It took two days before I felt a difference.
Alex