Light grey pill with R637 on it? What kind of pill is it and what is it used for? What's the mg?

Not Medical Advice: The pill imprint "R637" belongs to Gabapentin 800 MG. It is used in the treatment of persisting pain, shingles, and other conditions.
Updated on Monday, February 06 2012 at 07:23AM EST
Collections: gabapentinherpes zosterpill