urinary tract infection
"On day five of a 10 day course I noticed a rash on my face. Over the next 12 hours it would cover my entire body. It didn't itch it burned!! Doc said benadryl wouldn't help so I needed a steroid shot. I was also very dizzy and tired on this medication. If you have never taken Bactrim and aren't sure if you are allergic to sulfa drugs, I would just take something else."