Metronidazole
"I'm really glad I read the hints about taking the Cipro 2 hours after the Flagyl.  I hope it helps!  Also got some Zofran.  I came down with diverticulitis for the first time ever, and was perscribed the above drug combo.  I'm on day two and the debilitating pain is gone.  But now I have the dreaded nausea and diahhrea, and just plain feeling like I have stomach flu!  But I'm going to try the suggestions offered by others, and keep my fingers crossed they work...otherwise, I'm not sure how to go back to work, without toting along a porta potty :)"