androgenetic alopecia
"I've been on it from 29 till now (42).  I've experienced 0 negative side effects.  My doc monitors my liver functions annually.  Family noticed improvement.  I believe over time I mainly have maintained the hair I had and haven't gotten much balder, unlike other men on both sides of my family who are either completely bald or much thinner.  It is much cheaper to buy the 5mg pill and cut it in 4ths."