anxiety
"I was started on Garbapentin for a herniated cervical disc.  At first I was put on 900 mg, which wasn't really helping so my doctor bumped me up to 1800 mg a day.  I've always been somewhat depressed and anxious... I got a side effect I did not bargain for.  Not only did it help my pain, but my mood has been the best it has in years!  I feel happy!!! Calmer.  I can tell as soon as I miss a dose because my mood changes.  I Hope my doctor lets me take this once my pain is gone.  Usually side effects suck, this medication is not only a pain med but a happy pill."