Has anyone else out there ever heard of IBS being caused by serious reaction to an antibiotic. I got severe bronchitis last year and ended up in the hospital with an asthma attack. I spent a week there on IV antibiotics, and then was forced to follow with 10 day course of levaquin when I got home. I was in absolute agony and had to return to the doctors twice because the stomach pain was nearly unbearable. I had a stool sample taken and all looked fine, but the doctor told me that I probably just did not tolerate the antibiotic well. Since then, I have had increasingly bad bouts of IBS with stomach pain and cramping. Please tell me if anyone else has heard of a relation between these two problems.