The Food and Drug Administration (FDA) issued a warning about the sexual side effects of Finasteride persisting even after stopping the medication. This warning was based on approximately 100 reports that the FDA received over a period of 20 years. There is no evidence that Finasteride causes permanent sexual dysfunction, and irreversible side effects from taking Finasteride are rare. Clinical studies show that about 4% to 6% of men who take Finasteride experience these side effects, and those effects were usually reversible.