bacterial infection
"My 83-yr old father took only five (5) pills over the course of a few days and ended up in the hospital in acute renal failure and 103 degree fever.  This man was not on any medications prior to taking Bactrim DS and was still working.  His kidney functions have not returned to normal, his blood platelets are critically low, his blood pressure is now elevated, as well as his blood glucose.  His whole life has changed for the worse all because of five (5) Bactrim pills.  I just hope he's on the road to recovery."