I will not prescribe finasteride to young men with MPB because of the potential side effects. In my clinical experience, the length of time on the medication does not correlate with the severity or duration of the side effects. There are numerous hormonal and nonhormonal treatment options for men with PFS.
—Playing with your sex hormones with Propecia use can play with your sex life: Pelvic Health & Rehabilitation, July 16, 2015