I am 23, my hair loss was diffuse and slowly becoming more visibile. It had been going on for about 1 year. The shedding slowed down a bit and I saw a Doctor, and have been taking Propecia 1 mg everyday for exactly 4 weeks today, the real Merk stuff, not generics or imports. I am not expecting immediate resutls, but of the 4 weeks on this drug, I have been shedding like my hair is trying to escape the plague for the past 3 weeks. My hairloss has gone from iffy to obvious in just 3 weeks time. I here there are non-responders to this drug, but if that is the case, does just mean nothing happens or that you shed 50x times worse? All the hairs that are shedding are very thin compared to the thicker hairs on my head. I have never taken anything else for hairloss, no topicals, so I know my hormones arent screwed up like alot of people out there who take anything under the sun for hairloss and the negative effects just pile up. Has anyone had similar experiences?