May not apply to OP, but an interesting article that came up recently regarding lower back pain.
http://www.guardian.co.uk/society/20...-pain-patients
I do know that a lot of people who have rheumatoid arthritis take antibiotic, preventing their immune system from attacking their joints, causing inflammation.
From my experience, back pain remedy included combination of pain reliever, muscle relaxant, rest, stretching, and/or preventative measures such as better posture, lifting technique, losing extra weight, and orthotic inserts.