Neurontin
"I've taken Neurontin for many years now and I know without it I wouldn't be able to walk.  I know this because I tried not taking it and after 18 hours I was climbing the walls and I was in horrible pain. I'm not exaggerating either.  I've tried Lyrica and it didn't help at all. I'm still in a lot of pain but I know without it the pain would be a lot worse.  I do have a few side effects with it, some confusion and loss of words at times, but I'd rather live with the side effects than the pain I'd have without it."