Sulfamethoxazole / trimethoprim
"I am currently suffering from recurring cystitis and UTI's. This is my first experience of taking Trimethoprim and after taking the 3rd tablet I became quite unwell with flu like symptoms, fever, headache, chills, whole body aching, loss of appetite. Because of how terrible I was feeling I didn't want to continue the course for fear it was the pills causing the illness. Is that possible? Or could I just be that I am run down and immune system was low?"