bombscience said:
Hair, in what month did your side effects develop?
Very hard for me to say. I believe they came on very gradually, very slowly, progressively getting worse over time. I was slow to notice what was happening because I was single, I was overjoyed at what Propecia was doing for my hair, and I was not at all concerned about side effects because Merck says that less than 2% of men have side effects and that all side effects resolve upon discontinuation of Propecia (I also didn't frequent these forums back then so there was no scare-mongering).
I know for certain though that I did not have side effects right away because I was with a girl briefly, maybe a month or two after starting Propecia, and didn't have any noticeable problems at that time. However, a few of the people I've met online (like PolarBear, who used to post here) had problems from the very beginning. Everyone is completely different in how they react to drugs I suppose.