My husband was on gabapentin about a year ago. They started him out at 300mg 3x/day and went up to 1200mg 3x/day. He never complained of any side effects (I specifically asked about drowsiness because I worried about him driving) but also said it didn't help his pain all that much, even at the higher dose.

Doctor finally let him wean off of it. Had him cut the dosage in half for 3 days, then half again for 3 more days, then quit altogether. He went from full-out to nothing in a week!

He didn't tell me until about a week ago, but he said that after he quit taking it altogether he felt like he'd suddenly be struck down with attention deficit disorder. Said he'd pick up the phone to make a call and couldn't remember the number or even who he was about to call. Said it lasted for months. He's ok now, but he thinks it was a withdrawal symptom and he thinks he should have been weaned off much more slowly.

FYI in case you're taking it and thinking about getting off...