http://www.medications.com/effect/view/32583 UNTIL READING DIFFERENT REACTIONS TO BACTRIM, I THOUGHT THAT I MAY POSSIBLY HAVE A BRAIN TUMOR. I STARTED BACTRIM FOR POSSIBLE STAPH INFECTION AFTER HAVING POISON IVY AND SOME SPIDER BITES. AFTER TWO DAYS ON BACTRIM, I DEVELOPED A LOW FEVER AND HAD DIFFIC