Since I started taking this for sciatic nerve pain, it's like my muscles aren't working for bowel movements. I have always been regular with no problems and that's why I suspect gabapentin is doing it. I tried to get off this stuff but started experiencing a lot of anxiety and went back on a low dose of 200 mg a day, intending to taper off to 1 mg. I wish I had never started taking it as it makes me drowsy and feeling unstable when I go for walks. Any experience like this someone may have had would help me cope.