Sulfamethoxazole / trimethoprim
"Yesterday I  took my first dose as an infection preventative so that my toe nail that was butchered off by a nail shop would not get infected. Two hours later my tongue was painful and felt heavy and swollen, my throat tightened and a sore of some sort popped up inside the inner cheek of my mouth. It was hard and painful like an abscess. My eyes turned blood shot red. I have been looking like a GD zombie for almost 24hrs. 12 hours later after taking the medication yesterday my tongue is no longer sore, but today the sore in mouth is still present. The sore no longer hurts though. I'm itching like crazy, and I'm having flu like symptoms."