There are just too many guys who have been on Finasteride for well over 10-15 years and haven't had any major issue whatsoever.
Does that mean Finas is harmless? It isn't. It's a medication, and like any other one, it requires precaution.
But the majority of men who don't have any issue over...
More or less because of this: http://sergiovano.blogspot.com/2020/12/las-10-novedades-en-tricologia-de-2020.html
It's effective, easy to take, and quite cheap.
But it does come with sides. And some of them aren't good at all.
If anyone is interested, here's an article of Sergio Vañó (one of Spain's leading dermathologists) on 2020 studies done on Oral Minoxidil (and other new treatments):
See it foryourself: https://www.google.com/search?q=dht+reduction+finasteride&rlz=1C1CHBF_esES865ES865&tbm=isch&sxsrf=ALeKk01gRLslRTFz_EvqBDuJ2w4BNebX9A:1605561076376&source=lnms&sa=X&ved=0ahUKEwjggP2M_YftAhVF4OAKHUGvCDkQ_AUIzgEoAQ&biw=1366&bih=625
Actually there are quite a few studies. The leaflet of Finasteride in Spain mentions it specifically.
But the key to all of this is: the studies are almost all done on the women touching the pills with her own skin. It's almost never been studied on semen...
Ummm actually it may be, I think I might have mixed it up with Finas scalp half life.
Then just a month would do it.
EDIT: And yes, for the OP, Dutasteride and Finas have to be taken off if you are trying to get your wife pregnant. It's not common at all but it may cause some malformities to...