I believe the urologist
wanted to say that your friend had already developed non-reversible bladder weakening due to long term prostate
obstruction. His bladder is unable to expel urine thereby there is urinary stasis inside his bladder causing the bladder stone
formation. While he has urinary retention
i am afraid the bladder stone would continue to recur. For bladder weakness bethanecol hcl is usually given 25mg 3x per day to help in bladder contractions. He may also need to be on intermittent catheterization to remove the retained urine in his bladder.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications at: http://www.HealthcareMagic.com/doctors/dr-manuel-c-see-iv/66014 I would gladly help you. Best wishes.