1. - Viagra SE: affect blue-green color vision-->Air plane pilot should not fly a plane untile 6-hrs pass after taking viagra.
2. Priapism emergency =priapism for more then 3 hours= ICE pack & Penis Injection of Alph-agonist( phenylephrine or epinephrine) is better then oral terbutaline
   1. Arterial-cavernosal Fistula
      1. Rx. Angiographic Embolization
   2. Sickle cell
      1. Rx. IV fluids
   3. artery rupture
      1. Rx. Surgery
3. Erectile Dysfunction
   1. MCC is psycological (75%)