Dutasteride (Dutanol) 0.5 mg is a medication used primarily to treat benign prostatic hyperplasia (BPH), or enlargement of the prostate, among men. It is also used off-label for hair loss among men, excessive hair growth, or hirsutism, among women, and as hormone therapy for transgender women along with estrogen. It has been approved for the treatment of scalp hair loss among male adults in South Korea and in Japan in 2015.