Dissolving finasteride for microdosing

[cobroh96]

Hello,
I want to dissolve finasteride in alcohol for microdosing and have some questions:

1) Is vodka fine or would stronger alcohol yield any benefits?

2) How long would such a solution maintaing its potency if stored in the fridge?
Only found a pdf by chemicals company, recommending to only store it for up to a month at -20°C.

3) How long are the pills good?
For microdosing with 0.05mg a package of 30 5mg pills would last me over 8 yrs. I guess that's way too long, right?