Finasteride Dosage...Just making sure....

I was just wondering what dosage of finasteride people have found to be effective. I have heard 1mg-2mg ED.

I know it depends from person to person, but I was wondering if I planned to take 2mg ED while on a 500mg/week test e cycle if that would be enough? I think I am prone to MPB so I wanna be safe; I want to get enough so I am not caught short.

I was thinking 2mg ED while on cycle and 1mg ED on PCT.

Oh and I was wondering if finasteride kills sex drive? I think I have heard of this happening, but I'm not too sure if it is a legit claim or not.

Thanks for the help.