Something worth considering
I've heard that long term/high dosage use of Ibuprofen is bad for your liver or kidneys, I forget which.
Ibuprophen - kidneys, but only at very high doses for sustained periods
Acetominophen (Tylenol) - liver
Also, ibuprophen is a significant factor in emergency room admittance (gastrointestinal bleeds). But it sure is great for short term use for back strains.
In '04 I came down with a chronic severe pain syndrome that most of the meds except heavy narcotics barely touched, and the specialists all told me was something I'd live with the rest of my life. So I invested a lot of time and resources in researching through peer reviewed medical journals to find a solution for myself that would be healthful over the long term. I ended up using something commonly used in sports medicine both to prevent as well as treat musculo-skeletal injuries in Europe and Japan: Systemic Enzyme Therapy (SET) and it not only resolved my pain and allowed me to drop the meds, but it actually reversed the underlying problem, and I found it significantly improved my cholesterol numbers. (In fact, Olympic teams routinely take SET to prevent training and performance injuries).
Several friends with serious, chronic back problems have pursued SET and all of them were able to gain the upper hand in short order. Might be worth a try. One reason I chose it for my condition was that I needed an anti-inflammatory and anti-edemic that I could take for life that had no risk profile. There are several SET complex products (aka proteolytic enzyme complexes) that one can try: Wobenzym N (#2 OTC anti-inflammatory after aspirin in Germany), Neprinol, VitalZym, etc, as well as various vendors of the single systemic enzyme, serrapeptase. Many online vendors sell the various products competitively (and some not so competitively).
I discovered that for acute or chronic pain, the dosage I had to take is much higher than the dosage they call out in the instructions. That's a maintenance dose for healthy folks. But it's perfectly safe to take high dosage.
Aside: there is also a non-SET Cox-2 inhibitor (that's an anti-inflammatory) that is natural, scientifically validated, and that I found helpful for inflammation and pain as well (although at this point I just take the SET) and that is the product
Zyflamend. May be worth looking into for back pain.
In any case, if anyone is interested at all, I can point you to a website I put together at the insistence of guys that suffer the particular syndrome I have (chronic pelvic pain syndrome) where I tell enough of my story to be illustrative and there are links to small, helpful portions of the medical research that exists (there is a lot of it out there). And I'd be happy to offer input here if it's helpful, understanding I'm not in the mode of giving medical advice of course.