Q: I’m concerned that finasteride might result in unwanted body hair on the arms, back, etc. Is there any truth to this? My thinking is that since finasteride blocks the enzyme 5 alpha-reductase which converts testosterone to its more active form, DHT (dihydrotestosterone), is it possible that it might actually have some effectiveness in ameliorating unwanted hair?

A: Yes, finasteride does have some ability to decrease body hair, since growth of body hair is stimulated by DHT. However, the effects of finasteride are mild and not observed by everyone, so if you have unwanted body hair you will probably need some other means to remove it such as waxing, laser hair removal or electrolysis. The important thing is that finasteride doesn’t increase body hair.