Male pattern baldness is caused by a hormone called DHT which shrinks and blocks the follicles in your scalp which your hair grows out of. Propecia contains a drug called finasteride that reduces the amount of the DHT in your scalp. This prevents further hair loss, and for many men it can help hair regrow and increase in thickness.
HOW LONG DOES PROPECIA TAKE TO WORK?
Propecia starts working as soon as you take it. You’ll usually have to wait a couple of months until you see visible differences as it takes time for your head to produce new hairs. Hair can look fuller and thicker after only three months, but six to nine months is more typical.