surgical prophylaxis
"Consider another drug. Clindamycin has ruined my gut. I have had diarrhea for over a month (tested for c. diff: negative).  The only thing I can eat is peeled white boiled potatoes. Everything else goes through me in just a few hours.  I've lost a lot of weight and I'm permanently tired. My doctor has run all manner of tests and I am just not recovering.  I was a healthy 70kg 31 year old male. Now 62kg one month later. 

I can't remember being so ill."