(Alprostadil is also called prostaglandin E1. In powdered kind, it might be referred to as CaverJect or Edex.) Papaverine plus phentolamine in addition alprostadil (Tri-Mix) is among the most powerful option. It needs refrigeration and it has the identical side effects as papaverine and alprostadil. Quad-Combine, a mix of Tri-Blend and a drug calle