(Alprostadil is often known as prostaglandin E1. In powdered form, it could be called CaverJect or Edex.) Papaverine additionally phentolamine in addition alprostadil (Tri-Blend) is considered the most potent solution. It requires refrigeration and has a similar side effects as papaverine and alprostadil. Quad-Mix, a mix of Tri-Mix plus a drug know