In my experience, when I put a man on finasteride, it is not uncommon to reverse this process if they have crown thinning. I have seen this happen as men in their 50-80s, who were put on Proscar (finasteride 5mgs) for their prostate, and they were considering a hair transplant only to come in and show me the of the reversal of their crown thinning from the prostate drug that they were given.