My 3 year old daughter began taking bactrim for a 7 day course for a very minute uti she at that time had no fever at all. We began 7 day course finishing on the 27th.. on the 2nd she had complained again of hurting with urination. . There was about 2 doses of med remaining I gave her a dose about 6-7 hours later she woke with a 102 fever after Tylenol fever broke at about 7 hrs past peek 8 days go by she is fine complaining here and there of hurting with urination so I gave her the last bit left & same thing 6-7 hours later she woke with 103.2 fever very red cheeks blood shot eyes.. her doc says he doesn't think it's the med but I am still skeptical