Sulfamethoxazole / trimethoprim
"Please don't let anyone scare you into not taking this. If you're like me with new medicine, you go online and research every little side effect and review and convince yourself not to take it. I was really scared to take this as I had bad reactions to Macrobid and Ciprofloxacin, and after reading these reviews I just knew it was going to be the same way. I'm on day two, no side effects other than a little nausea and a headache. That's the worst of it. We'll see how it goes by day 7, but so far this has been the best antibiotic I've taken."