Stopping finasteride

Just had a question about finasteride. I have to get surgery and needed to stop finasteride. If I’m off finasteride for a month or 3 weeks will there be a lot of catch up loss making my finasteride use worthless?

Usually, finasteride stays in your hair follicles for about 2-3 weeks.  Ask your doctor about reducing the period to 2 weeks for the holdout.