Actually this is controversial, as you probably already read. It does reduce prostate cancer but it makes it more difficult to spot it when you have it, and when you have it it is more aggressive. You should tell your specialist you take propecia when being examined for prostate cancer as finasteride can screw up the results.
The leaflet reports:
https://www.medicines.org.uk/emcmobile/medicine/3679
What else should you know about Propecia?
Finasteride can also be used for a type of prostate problem called ‘benign prostatic hyperplasia’ or BPH. Information collected from a clinical trial in men taking finasteride 5 mg (a dose 5 times higher than Propecia) for 7 years showed:
- the number of men who developed prostate cancer was lower in men taking finasteride compared with those taking nothing
- the number of men who had a high score in a tumour grading system was higher in some of those taking finasteride compared to those taking nothing
- the effect of long-term use of finasteride on tumours of this kind is unknown.
If you would like further information about the tumour grading system or this trial, please talk to your doctor.