bacterial infection
"I have been battling a C diff infection for a couple months now.  I tried a 10 day (500mg x3) course of Flagyl which didn't seem to help much. The Flagyl seemed to increase my nausea while only slightly reducing the waves of stomach pain and didn't seem to improve the diarrhea much at all. A couple days after ending the Flagyl, I was experiencing the worst symptoms of C diff.  I immediately went on Vancomycin.  I just finished a 14 day course (500mgx4) of Vancomycin yesterday, which seems to have cleared up the symptoms.  Vancomycin is extremely expensive (my portion was nearly $2k after insurance picked up the bulk of the cost), but after Flagyl failed, I was glad the Vancomycin seems to have worked with no noticeable side effects."