- any of the following: a debilitating concomitant illness, a history of prostate or bladder cancer or prostate surgery or radiation treatment to the pelvis, urethral stricture, neurogenic bladder, current urinary tract infection or otherwise potentially compromised urinary tract systems, a creatinine level of over 3.0 mg per deciliter, or a residual urinary volume after voiding of over 350 cubic centimeters.