Hi Dan
The opiates in general appear to increase the release of antidiuretic hormone and cause spasm of the urethral sphincter. So it will probably be a problem in people with prostatic hypertrophy or urethral stricture. How much of an ACTUAL problem this is in real life with
oxycodone, though - I'm not sure. There shouldn't be too much harm in trying it at a low dose & see if bladder activity worsens.