Several years ago I developed idiopathic SFN like so many on these boards. Gabapentin is the only thing that works for me but it causes intolerable constipation. Gralise works great for me but my insurance won't cover it. To combat that I use magnesium citrate, magnesium glycinate, miralax and Amitizia. There is a new drug out called Linzess which is considered safer because less of it is absorbed into the blood stream. It gave me very bad diarrhea like many folks complain.

I would try anything and everything. I did not realize how bad mine was until I got it under control. After having lived through it I would be hard pressed to say whether my painful SFN was worse or severe constipation.