1200mgs Neurontin is a low or starting dosage unless you have a specific reason....maybe this could be raised slowly (with Dr. of course), I took 3600mg. And something else could be lowered then....some people cannot tolerate a high dosage of Neurontin or only a mid-dosage. (I don't have experience with the other meds for PN.)

A newer med, Lyrica, is a "replacement" of Neurontin or sometimes used with Neurontin (not sure why). I tried it but it caused swelling for me, a side-effect for some.