Can Propecia taken by mid-teen guys stunt height growth?
There are some teenagers who take Propecia (finasteride) under the care of their doctors, but it is generally not prescribed to teenagers. The effects of finasteride on developing teens is not clear and should probably not be used in those who are still in growth mode (usually under 17-18 years old). It is theoretically possible that it may stunt growth during the puberty years, as it interferes with testosterone conversion into dihydrotestosterone (DHT). DHT is one of the many hormones that is involved with secondary sex characteristics such as beard, chest, and pubic hair.