Finasteride long-term question

So somebody who continues to take finasteride and does not stop like in the example you gave, it will often continue to provide it’s benefits in retaining hair and won’t necessarily lose its effectiveness?

Correct; however, hair has its own agenda with genetic codes for Apoptosis (cell hair suicide) which is delayed by finasteride but not always a guarantee that each hair may take its own course.  Generally, finasteride slows this process down for the time you take the drug. I have had patients on finasteride for 25 years.  When they stopped it along the 25-year history, they always lost hair.  This tells me that finasteride works if you take it for anyone losing hair.