Quoted from http://healthland.time.com/2012/07/12/propecia-problems-baldness-drug-linked-with-long-lasting-sexual-side-effects/
Propecia Problems: Baldness Drug Linked with Long-Lasting Sexual Side Effects
The adverse side effects of the anti-baldness drug could last for months or even years for some men
By Alexandra Sifferlin | @acsifferlin | July 12, 2012
In April, the Food and Drug Administration (FDA) updated the warning to finasteride, Merck & Co.’s drug marketed to treat both male pattern baldness (Propecia) and enlarged prostate (Proscar). The new warnings noted that the sexual side effects associated with the medication, including problems with libido, ejaculations and orgasm, could last even after patients stop taking the drug.
Now a new study published in the Journal of Sexual Medicine finds that side effects may not only continue after stopping finasteride, but they may last for months or even years.