My hair had shed a bunch for me as well, but I am sticking with it to see if my theory is correct.
My MPB is aggressive and it started when I was almost 24. My theory is this if Propeica does what it is designed to do. (Once my body and scalp I guess you would say, gets used to my new Hair Shed Phase Cycle). (MAYBE I will start regrowing some of the hair that I lost). To see results with Propecia, I would have to take this drug for at least 14 more months.
Butt that is my theory to this drug and MY body. Lastly, Everyone DOES react different to medicine.