Alprostadil oh HO H Prostaglandin E1(PGE1),known pharmaceutically as alprostadil,is a prostaglandin.It is a drug used in the treatment of erectile dysfunction and has vasodilatory properties.Alprostadil Prostaglandin E1 (PGE1), known pharmaceutically as alprostadil, is a prostaglandin. It is a drug used in the treatment of erectile dysfunction and has vasodilatory properties