title: A randomized crossover study using yohimbine and isoxsuprine versus pentoxifylline in the management of vasculogenic impotence.
abstract: OBJECTIVE
  We evaluated the efficacy and safety of yohimbine and isoxsuprine or pentoxifylline in the management of vasculogenic erectile dysfunction.
  
  
  METHODS
  A total of 20 patients diagnosed with arterial insufficiency and cavernous venous leakage by pharmacological penile duplex scanning underwent nonhormonal oral therapy. A randomized crossover study was performed using 5.4 mg. yohimbine plus 10 mg. isoxsuprine or 400 mg. pentoxifylline 3 times daily. Response to therapy was assessed by a sexual questionnaire and repeat penile duplex ultrasonography.
  
  
  RESULTS
  No patient in either phase of the study in either group had a complete response to the oral regimen(s) and there was no improvement in the pre-injection or post-injection cavernous arterial peak systolic flow velocities or resistance indexes.
  
  
  CONCLUSIONS
  Our study suggests that these oral agents, although well tolerated, were not effective in the management of these patients with mixed vasculogenic erectile dysfunction.
mesh_terms: D000284:Administration, Oral; D018592:Cross-Over Studies; D004359:Drug Therapy, Combination; D006801:Humans; D018783:Impotence, Vasculogenic / Q000188:drug therapy*; D007556:Isoxsuprine / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D010276:Parasympatholytics / Q000627:therapeutic use*; D010410:Penile Erection / Q000187:drug effects; D010431:Pentoxifylline / Q000627:therapeutic use*; D014665:Vasodilator Agents / Q000627:therapeutic use*; D015016:Yohimbine / Q000627:therapeutic use*
chemical_list: D010276:Parasympatholytics; D014665:Vasodilator Agents; D015016:Yohimbine; D007556:Isoxsuprine; D010431:Pentoxifylline