Metronidazole
"While I'm confident Flagyl is working I have suffered some severe side effects, one of which is unlisted. I believe it is working because my abdominal pain has significantly decreased since being diagnosed with diverticulitis about 1 week ago.  I am also taking Cipro. The reported side effect of having a metallic taste is very understated! Not only do I have an AWFUL paint/chemical taste constantly in my mouth, but my sense of smell is on overdrive! This has contributed significantly to my loss of appetite, nausea, and in many cases my inability to function. I threw away my sheets because I couldn't sleep; I carry around room deodorizer with me because whenever I walk into a room I gag due to the smells - that are only overwhelming to me."