urinary tract infection
"I had a UTI with some blood showing in my urine prior to taking two 500mg Cipro tabs a day.  Which I took for 3-4 days. I went for a short 1/2 mile walk. Toward the end of the walk I started limping as my right inner foot arch was becoming more and more painful to the point I couldn't walk efficiently anymore. 

I limped back home trying to figure out why was I having all the pain in my foot? As I didn't twist or turn it or anything like that? 

I stopped taking the Cipro and the tendon pain in my foot lessened each day. Cipro removed the infection, but it left me with permanent plantar fascia tendon damage in my foot.

I wouldn't recommend Cipro to anyone. The first side effect listed is causes tendon damage-ruptures. Not good people/FDA."