I've been on Finastride for over 25 years. I started when I was just starting to lose my hair. It was getting thin enough you could see birthmarks on my scalp. About a month in I stopped loosing hair. About 6 months in, noticeable regrowth. At a year, 90% of it came back. I get Proscar, the 5 mg version and use a pill splitter and cut into 4. Proscar is covered by my health plan. Propecia is not. Both have Finastride as the active ingredient.
I am best case scenario. I used to work with another guy who was also relatively young when he went on it. He had good success, but not as good as me. Recession by the temples didn''t fill in, but he got everything on top back. Another friend tried it, and stopped because he said he had side effects.
You have to start before the area is completely bald.
It is a wonder drug for me.