I've been taking bactrim and pyridium for 6 days for a uti infection, but i still have the symptoms. what could it be? since starting the antibiotics, i've felt better, but once the medicine wears out, it gets worse. i only have enough left to last me thr

Often : Often times the antibiotic given to treat a UTI does not work. This happens because the bacteria is resistant to the drug (bactrim (sulfamethoxazole and trimethoprim) in this case). Typically a urine culture will be done, this test will reveal if a UTI is present and what bacteria is causing it and what antibiotics will work. Hopefully your doctor performed this test. If so then a medication adjustment can be made as deemed necessary. Also consider you may have something else going on like vaginal infecion, kidney stones, etc. Please see your doctor. Best of luck and happy holidays.

See below: You could be infected with a bacteria resistant to the Bactrim (sulfamethoxazole and trimethoprim) you are receiving. If it hasn't already been done get a urinalysis and urine culture and sensitivity. If you have had repeated infections get a kidney and bladder ultrasound.