Metronidazole
"I deal with diverticulitis every 9 to 12 months. CT over the past 15 years keep showing mild diverticulitis as they call it but when it hits it feels nothing like mild! Nasty lower left abdominal pain . Sometimes I get a fever. Now my dr. Just put me on antibiotics as soon as I get symptoms because I always go into the fever eventually . Yes going on this for  7 to 10 days can give you diarrhea.  I found quite a while ago since probiotic yogurt came out as long as I eat lots of that I rarely get diarrhea now. And since you should be on  liquid and very soft food diet anyway just switch yourself and eat nothing but probiotic yogurt and soups while you're taking this stuff.  always take it with a meal too. And no alcohol!"