Caverject Impulse (Alprostadil for Injection) 20 mcg, 6/Box (RX)Caverject Impulse is the brand name for a medication called Alprostadil for Injection. It contains the active ingredient alprostadil, which is a synthetic version of a naturally occurring hormone in the body that helps to relax blood vessels and increase blood flow. It is used to treat erectile dysfunction (ED) in adult men by directly injecting it into the penis. Caverject Impulse is available in a single use, prefilled injection device that delivers