You will find many folks here on Gabapentin. It is the go-to drug for Neurologists. I was on 1800mg/day but found the constipation intolerable. I switched to Gralise, an extended daily release.

If your pain is at the nuisance level, you may only need a small amount, such as 100mg/day. At that level the side-effects are minimal, but increase as you increase dose. You will likely be started on that dose anyway.

Most folks find they need to increase the dose as the effects stop working. Eventually they find a plateau that works. Empirical evidence is most folks here plateau at 1800mg. I think there is a study measuring and concluding that.