Sulfamethoxazole / trimethoprim
"I've been taking it for two days now, I have one more day left to take this medicine. On the first day I got a pretty strong headache and took some advil which it did react to. Second day, this morning, I woke up with a migraine, took 3 advil. after a few hours migraine then degraded to a bad headache. UTI symptoms have gotten better, headache is getting worse. I've never had a migraine before today. The last time I had a UTI I was prescribed something different, I'm not sure what but I did not suffer any side effects."