Finpecia 1mg – The Medicine That Men Use To Treat Benign Prostatic Hyperplasia And Hair Loss Finpecia 1mg is a medication used to treat benign prostatic hyperplasia (BPH) and hair loss. It is a 5α-reductase inhibitor, which means it inhibits the enzyme that converts testosterone to dihydrotestosterone (DHT). DHT is a hormone that plays a role in the development of BPH. Inhibiting...