There are a variety of medications available in pharmacies which claim to stop or reduce hair loss, some more successful than others. Probably the most popular medication is Minoxidil.
It is used in tablet form as a medicine to treat high blood pressure. It was observed that some patients receiving Minoxidil experienced excessive hair growth as a side-effect. Further study proved that by applying Minoxidil in solution form directly to the scalp, it could showed to be effective to those experiencing topical hair loss.
Fenasteride is an oral medication acts by inhibiting the conversion of the male sex hormone testosterone to a metabolite called Dihydrotestosterone (DHT). DHT is a hormone responsible for male pattern baldness. Fenasteride acts by inhibiting the action of an enzyme called 5 alphareductase. Clinical studies have shown that men who suffer hair loss have high levels of 5 alphareductase in and around the follicles.
Fenasteride causes a significant drop in both scalps and blood concentrations of DHT. Studies have shown that DHT levels decrease by up to 68.8% and testosterone levels increase by up to 9.1% in men who take 1mg of fenasteride a day.