clostridial infection
"Absolutely awful side effects. First the dark urine color (not really a problem, but bizarre), then the fatigue, the nausea, the total loss of appetite. I was on this for 10 days for a c.diff infection (caused by clindamycin... AVOID CLINDAMYCIN) and I lost ten pounds. I had to force food down my throat just so I wouldn't wither away, and I could barely get out of bed. Took care of the worst of the c.diff, but not all of it. I still have a c.diff culture in my gut 6 months later."