Rifaximin
"I absolutely am amazed by Xifaxan.  After suffering from IBS symptoms for years (you know, wake up with flat stomach, go to bed looking 7 months pregnant, in addition to painful cramps, horrid gas etc...), the Xifaxan eliminated my symptoms in a matter of days. My bad flatulence disappeared. Bloating..gone. Lost a few pounds to boot. Unfortunately, after two rounds in Sept-Oct, my symptoms were back in December. If I could, I would take Xifaxan every day.  Insurance is not cooperative.  After 24 hours on this latest round, my bloating is well diminished and my low back pain is better (maybe because when IBS symptoms aren't bad, I can more easily contract my abdominals)."