urinary tract infection
"I used to use nitrofurantonin when I would get recurrent urinary tract infection as a low dose and that seemed to work well. I hadn't had a UTI in 7 years then got one. Doc prescribed nitrofurantonin and after 3 pills my symptoms were worse. Usually when I get antibiotics for a UTI my symptoms stop almost immediately so I knew they weren't working. Doc then prescribed Bactrim and I felt better within hours. I must have a nitrofurantonin resistance from taking the so much?  My side effect was I was very tired. I could have slept all day."