There are two drugs approved by the FDA to treat androgenic alopecia AGA, Minoxidil and Finasteride 1mg.Finasteride works in a different way than Minoxidil, in that finasteride prevents hair loss by reducing circulating levels of DHT, as detailed below. What is Finasteride? Finasteride is a 5α-reductase inhibitor, which, as the name suggests, works by inhibiting the action of 5α-reductase. The …