Whats the best treatmtnet for a bladder infection that won't go away?

Antibiotics. Antibiotics are the best way to treat a UTI (urine infection). It can become dangerous if untreated and can lead to kidney infections (fevers and back pain). For recurrent uti, you should see your doctor to rule out any other problems that might not be a UTI or that may predispose you to getting them. Urinate after sex and stay hydrated. Cranberry supplements can't hurt, but don't treat uti's.
Needs culture & sens. Uti is a common condition in females. Fortunately, it can be easily treated with antibiotics. However, if you have recurrent uti, you may need urinary culture and sensitivity to isolate the organism causing the UTI and to use the correct antibiotic regimen for your treatment.