Most likely that is Gapapentin. It is used for seizures and, less commonly for chronic pain.
Feel free to ask a follow-up question.
And a BONUS is always appreciated.
No. It is not a narcotic so it does not work like vicodin. Honestly no one knows for sure why it is effective for chronic pain in some patients. It was developed for epilepsy and some MD's just noticed that it works for chronic pain.