bacterial infection
"I was prescribed Keflex (Cephalexin) after having surgery to prevent infection, and wanted to add to the list of side effects.  They do not mention acid reflux, which I had every time I took the capsule (4 times a day, for 10 days). Also women need to take a probiotic while on this medication as it decreases natural flora and you can get yeast infection. I learned this the hard way by not eating enough yogurt while on this medication and not taking any probiotics. Just wanted to give a heads up and hopefully spare many women this highly uncomfortable experience."