I' ve been on all kinds of pain meds for years, had a successful c-spine fusion in May, and have only been on Darvocet & Vicodin the past 4 months. I have successfully weened off them now - taking zero pain meds. I have also experienced chronic diahrea since being off them for 2 weeks now. Is this because pain meds cause constipaton? I've been on them for so long my bowels need to adjust? Has anyone else experienced this condition? When does it get better?