Take finesteride if you want peach fuzz on your head. Read the studies. If you don’t understand the statistics very well just read the summary. My takeaway was as follows: It does seem to lower PSA but it’s less clear as to decreasing prostate cancer risk. It may make you less sensitive to the test.
My understanding from the urology team is that finasteride essentially halves your PSA value so I try and make sure that patients mention being on finasteride when the bloods are done so it is on the request