I am trying to consider options to surgery for spondylolosis, grade II spondylolisthesis, severe degenerative disc disease & related nerve pain. This moderate to severe, chronic pain is currently somewhat manageable on one to two oral doses of vicodin 7.5 mg per day. I have no past personal issues or family history of drug dependence. Does anyone have an opinion on my chances of being able to maintain this regimen without requiring more, over time, to be effective? I am an active, otherwise healthy 74 year old. The "back doctor" I was referred to thinks the condition will become markedly worse without surgery.