Targeted delivery of drugs can reduce the side effects associated with oral delivery systems. The urethra provides easy access of therapeutic agents to the urinary bladder, an ideal organ for localized therapy for the treatment of bladder cancer, interstitial cystitis, overactive bladder, and chronic prostatitis. We propose a new therapeutic approach to increase the residency time and efficacy of the drugs by using biogradable polymers as a drug carrier, allowing a prolonged release of drugs in the bladder.