Get our free Prostin vr pediatric coupon and be eligible to receive a discount. You can reduce your Prostin vr pediatric cost by up to 75% with our free Prostin vr pediatric discount card. Bring it to a participating pharmacy near you to save on your prescription medication.Alprostadil is used to treat erectile dysfunction (impotence) and to help diagnose certain causes of this disorder. Alprostadil is also used to improve blood flow in newborn babies with a certain genetic heart condition. This alprostadil medication guide addresses only the adult male use of this medication in erectile disorders. Alprostadil relaxes blood vessels and muscles in the penis. This increases blood flow into the penis, causing an erection. Alprostadil may also be used for purposes not listed in this medication guide.