I recently started taking Gapapentin for PN nerve pain. I've read across the web that after one has been on it for a time, that you develop tolerance to the drug, & your dosage must be upped in order to receive the same pain relief. I also have found that when taking it 3x a day, as prescribed, that it wears off between doses. Does anyone have experience on this?

I have a friend on Nortriptyline, and he says his Neuro told him that once he finds a dose that works for him, that's his dose for life.