I have been taking it for just about 2 years now and at the beginning I really noticed shedding...apparently its totally normal.
In fact, I think that over the course of two years, I shed a LOT of hair, even though it is way thicker on top than it used to be.
Propecia definitely worked for me.
The other thing is that I noticed my front is still losing, not at the arte it was I dont think but I shed way more in the front than anywhere else...I might have to start on the rogaine soon.
I also took saw palmetto for a long time, and Omega3-6-9, zinc, etc.
Don't know if it helped but it can't hurt!!!