Propecia (finasteride) is the same drug used to treat benign prostatic hyperplasia (BPH), although the brand name for BPH treatment is Proscar. Men who take finasteride for male pattern baldness are prescribed a 1-mg dose, while men with BPH are typically given a prescription for 5 mg. Regardless of the dosage, finasteride is associated with side effects. In fact, the Food and Drug Administration (FDA) has issued warnings regarding finasteride and ordered the drug makers to put labels on their products regarding the sexual side effects associated with use of the drug. Therefore, if you take Propecia (finasteride) for male pattern baldness, you should know there is a chance you will experience libido disorders, ejaculation problems, organism problems, erectile dysfunction, male infertility, and/or poor quality sperm. The rest of the bad news is that these side effects—except for the last two–do not resolve after you stop taking finasteride.