Alprostadil
"Due to the blood pressure medicines I take, I cannot tolerate Viagra or Cialis. I tried my 1st MUSE (500mg) a few days ago.  Since it was my 1st dose, my wife and I about missed the window.  I don't believe the 500mg will be enough in the future.  I suspect I'll need the 1000mg.  The erection wasn't quite as firm as the Viagra and Cialis.  But because it had little or no side effect with respect to my blood pressure, it will be a winner for us."