"i have been in back pain since 2001 after a truck accident. i have been on many different pain medicines. i just recently got on opana er 20mg every 12 hours. my pain level has gone down. i also have had a nerve block that didn&#039;t help very much at all. my l1-l2-l3-l4-l5 and s1 are buldging and spine is deteriorating. i also have to take percocet 5/325 twice a day. not totally pain free yet but better."