Post-finasteride syndrome wasn’t reported in clinical studies, but it has been reported since the drug was approved.

Stopping finasteride treatment can cause post-finasteride syndrome. This may result in side effects such as memory problems or sexual dysfunction (problems that affect the desire for or ability to have sex). Post-finasteride syndrome wasn’t reported in clinical studies, but it has been reported since the drug was approved. Side effects thought to be caused by post-finasteride syndrome can be mild or serious. Although some of these side effects may go away with time, others may be permanent.

—Medical News Today, July 26, 2021