I took daily propecia for 2yrs. I was losing density all over throughout those 2 yrs at what I believe to have been an increased rate. After quitting I was left with a bald spot at crown that i didn't have before, loss of both temple points with one side worse than other, and much reduced density in the front of half my head.
Not trying to scare you. I would just suggest that if by the first 6 to 9 months your thinning hasn't stopped, then it's unlikely you will find success later. You always hear about the guys that only got results after sticking it out for the 2 y mark. Well, I hoped for the same and loat hair the entire time. I've been off propecia now for almost 3 months and im losing hair just the same as i was on it. I hope it slows down to the pre propecia rate. Some would argue I didn't respond to it and continuing couldn't have hurt. Now that I've been off it for a bit I'm starting to understand the subtle sexual and behavioral side effects I was experiencing. I always new something was up, but it was hard to appreciate the impact.