Slow drug-release system found highly effective in treating certain patients with bladder cancer whose tumors were previously unresponsive to cancer therapy TAR-200 is a miniature, pretzel-shaped drug-device duo containing a chemotherapy drug, gemcitabine, which is inserted into the bladder through a catheter and releases the drug for three weeks per treatment cycle. How the drug delivery system works  TAR-200 is a miniature, pretzel-shaped drug-device duo containing a chemotherapy drug, gemcita...