Thanks for your query,based on the facts that you have posted it appears that you have Benign Enlargement of Prostate
(46 gms)and have been taking Xantral (Alfuzocin) and Proscar
Both these drug help in preventing further increase in size of the prostate and relax the smooth muscles in bladder neck and prostate which help to improve urine flow.
However the size of prostate and severity of the symptoms is predominant factor to decide regarding endoscopic resection of prostate (TURP).
It is always advisable to get TURP done rather than taking drugs life long..
Please discuss this issue with your Urologist