Duloxetine
"I wanted to write this in the hope of helping others.  I've been dealing with chronic back pain that got a lot worse and intolerable the last few months. I couldn't sit, or drive without back spasms and shooting nerve pain. I was at my wits end. I tried a medrol 5 day pack, it didn't seem to help much. My doctor suggested a low dose 20mg of cymbalta. I was desperate so I thought I would try it and it's made a major difference- almost immediately. The side effects were bad for about 3-4 days, super tired, yawning non stop, very fuzzy, and no appetite. But I've been on it now for almost a month and I'm back to light workouts, and able to do mostly normal things. It does effect your libido though. My Dr also recommended Valium at night."