Post-marketing follow-ups suggested the possibility of persistent symptoms after drug discontinuation, which is referred to as PFS. Despite the lack of final proofs, the presence of severe and persistent side effects caused by the treatment of an aesthetic problem raises great concern for the clinician. A low estimated prevalence of PFS cannot be an excuse for nonvigilance since the drug is used by millions of relatively young and healthy individuals.
—Post-Finasteride Syndrome: Does It Really Exist? The Aging Male, April 2019