Sulfamethoxazole / trimethoprim
"I had a UTI with a MRCA on my face. I was given the drug for both. First mistake I went to FL and was under sun exposure which i didnt 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 migrane 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 aftr day 9 as opposed to his textbooks of day 2 or 3. As of now  The bleeding has only subsided.Its 10 days since"