Sulfamethoxazole / trimethoprim
"Was prescribed this for UTI, after only 2 doses all my UTI symptoms were gone BUT I had a bad sore throat, nausea 24/7, and back pain. I went to the doctor twice and they just told me to keep taking it but i kept feeling worse. Stopped taking it on my own. Hated every second of being on this antibiotic, never again."