What happens to sperm count when taking finasteride

Thanks doctor. What is your opinion on how finasteride effects sperm, that’s really my main concern at the moment, I’ve read people saying their levels dropped to a point they would be considered infertile. Also if I was to start I would like to stay on for 10years max, I’m concerned fertility problems could be permanent after such a long duration.

Sperm counts often drop with finasteride so checking it before and after you are on it for a month or so will tell you how low it will get. My son, on finasteride for 15 years, saw a reduction a sperm count but he fathered two children, the second one was not planned.