Ciprofloxacin
"I was super hesitant to take this, but didn't want to be overly paranoid, but wanted my UTI to clear up.  My UTI is gone, but by dose 6 I couldn't take it.  Dose 4/5 I was exhausted, hardly could get thorough work, and woke up with EXCRUCIATING calf cramp and headache.  My cramp won't go away, and I'm hoping by discontinuing this horrid medicine, it will go away soon (looks like it stays in your body 22 hours).  I don't think this should be a casually pre-scribed medicine."