<prompt> Which of the following agent is not used for treatment of erectile dysfunctionProstaglandin E2VardenafilPhenylephrineAlprostadil  <response>: Phenylephrine is an alpha agonist and will cause vasoconstriction therefore not used in erectile dysfunction where vasodilation of penile vessels is required Other Drugs given in the option are used for this condition For fuher details see chapter 19 Refer kDT 6e p295-296 