It’s real and has a growing body of research to prove it.

Finasteride is used as a treatment for male pattern hair loss, and is offered and marketed by “medical hair centres” throughout the world without mention of the possible complications. Its use can have serious side effects, [including]: sexual dysfunction including erectile dysfunction, neuroinflammation, insomnia,panic attacks, depression, suicidal idealization [and] reduced muscle mass. Post-finasteride-syndrome has been referred to as a “man-made myth” and a “delusional disorder.” But it’s real and has a growing body of research to prove it.

—Recovering from Post-Finasteride Syndrome: Fairfield Nutrition Blog, August 22, 2022