When my son was home last year he had an attack of post-herpetic neuralgia, he had shingles on his face as a child. I know that this is an on-label use for gabapentin, so I gave him one. It worked like a charm, but knocked him out. Evidently much lower dosages than the 600 mg. I gave him would have been better. He is a very tall man, and a heavy drinker, so I was surprised. He also has CMT, but no pain yet.