(Alprostadil is often known as prostaglandin E1. In powdered kind, it may be called CaverJect or Edex.) Papaverine plus phentolamine in addition alprostadil (Tri-Combine) is the most powerful alternative. It needs refrigeration and it has precisely the same side effects as papaverine and alprostadil. Quad-Combine, a mix of Tri-Blend along with a dr