Sulfamethoxazole / trimethoprim
"I wish I had read all this information posted on this website before I began taking Sulfa. Had I known about these side effects I would not have taken it. Like many others on this site, this medication landed me in the ER. I was absolutely not able to urinate. My bladder kept filling up but no matter how hard I tied, I could not go. I was prescribed Sulfa for a UTI and given 10 pills to take twice daily. I started the pills on a Friday night, by Sunday night I was in the ER. The absolute worst drug reaction I have ever had. I would rather deal with a UTI than take this medication again."