Review Question - QID 213499

A 43-year-old man presents to the clinic for complaints of decreased sex drive for the past 2 weeks. He reports that it is hard for him to get an erection and maintain an erection with his partner. This has never happened before and he is concerned. He denies any fever, infections, trauma to the area, or sensory changes. His past medical history is significant for diabetes and depression diagnosed 1 year ago. He takes metformin and sertraline as prescribed. A physical examination demonstrates decreased peripheral vision bilaterally and chest findings shown in Figure A. Which of the following is the best treatment for this patient’s condition?