Possible sides from Finesteride

[Herbaliser]

Just a pure simple question regarding possible side effects from using Finasteride?
What company or federation made the conclusion that itīs only 2% or less that experiences side effects by using this drug?

[Herbaliser]

I think itīs a fair question for everybody browsing this forum, since there are a lot hair transplant surgeons (doctors) active here for example that can answer this question.