Sulfamethoxazole / trimethoprim
"I had a UTI with a MRSA on my face. I was given the drug for both. First mistake I went to FL and was under sun exposure which I didn't know is dangerous. Was ok with acidophilis too. Day 8 of Bactrim I developed vaginal bleeding but made no connection.  Day 9 I stopped it. And day 10 I was blown up in hives, severe body rash, terrible chill w hi fever and a severe migraine attack. I was livid. They scared me to death. I felt I was dying. I was on Benadryl for 24 hours and started getting better. But the next day the MRSA WAS BACK. I nearly lost it! Obviously It was a terrible allergic reaction but my dr was hesitant as it occured after day 9 as opposed to his textbooks of day 2 or 3. As of now  The bleeding has only subsided.Its 10 days since"