"i was started on garbapentin for a herniated cervical disc.  at first i was put on 900 mg, which wasn&#039;t really helping so my doctor bumped me up to 1800 mg a day.  i&#039;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."