I noticed that my hairline was receding when I was 19 so I started taking the medication (Propecia) with a quickness. Six years later and my hair is thicker than ever. It doesn't cause regrowth but I caught it early enough that it prevented any further receding/hair loss. My doctor said I may experience a lower sex drive and/or testosterone levels but that hasn't been the case at all. No problems getting an erection, no man boobs, etc... The only difference is that now my man has a thick head of hair to grab onto when he's hitting it from behind.
My dad is bald and my brother is balding, my weave is not safe. 
