Sulfamethoxazole / trimethoprim
"I have a very stubborn sinus infection. I have had 2 rounds of a z-pac, biaxin xl, Augmentin, and no success whatsoever. I'm currently on day 3 of Bactrim DS, and I'm also taking a probiotic, as well as a b complex vitamin with vit. c. in this short time, I am feeling so much better. No side effects at all, not one complaint. I am so happy to be on this, it's actually working for me!!!"