I'm with Sarah. I didn't have any probs with other medications I was given for my back except for Vicoprofen. Like you I originally only took it when I was in so much pain I couldn't walk. Even taking it occasionally, you'll start to notice your back hurts more often, giving you the ok to take it more frequently. Yes you may never have the same problem with the pill, but it wont fix the underlying problem with your back. You should talk to your doctor about alternatives to that first if you can.
Vicoprofen was my DOC so when i saw this i panicked a bit. This drug and all others can grab you so fast you dont know what hit you. I also realize people can take pain meds and not have a problem. Have you been on pain meds in the past? Injury to your back?