Yea antibiotics always cause some nasty symptom. They kill off all your good flora bacteria in your intestine, which accounts for loose stools, pain, etc. There is always the chance of a yeast infection. I personally don't take any antibiotics unless I absolutely have to. Right when I left the hospital this time around, I purchased a bottle of nutra-flora to restore the good bacteria and then I plan on doing something similar to a liver/colon cleanse to clean my insides of all the toxins.