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alprostadil (al-pros-tă-dil) n. a prostaglandin drug administered by infusion to improve lung blood flow in newborn babies with congenital heart defects who are awaiting surgery and by injection into the corpora cavernosa of the penis or by application into the urethra to treat erectile dysfunction in men. Trade names: Caverject, MUSE, Prostin VR, Viridal.