Sulfamethoxazole / trimethoprim
"Hello all, just thought I'd share my experience with Bactrim. I'm a petite girl- as far as side effects goes I had almost none the first few days, but now on my 4th/5th day I am noticing the side effects appearing! Which are (for me) headaches, constipation (watch what you eat with this or else you'll get blocked up), loss of appetite (I'm not hungry almost at all), and oddly enough pain when I breath in (possibly mild pericarditis). I also can't seem to focus. But nothing too horrible. I take this on an empty stomach every time and it is absolutely fine. BUT- 3/10 pills left and I still have symptoms of a UTI !!! Ugh. So maybe it did not work for me."