title: Minimal time to successful intercourse after sildenafil citrate: results of a randomized, double-blind, placebo-controlled trial.
abstract: OBJECTIVE
  To determine the minimal time to successful intercourse after taking sildenafil citrate for erectile dysfunction (ED).
  
  
  METHODS
  Male patients with ED (mean age 60 years; mean ED duration 7.0 years) who were successfully treated with sildenafil (100 mg) for 2 months or longer were randomized to sildenafil (n = 115) or placebo (n = 113) for 4 weeks of double-blind treatment. Using a stopwatch, patients recorded the time needed to obtain an erection hard enough for sexual intercourse after taking the study drug at least 2 hours after eating.
  
  
  RESULTS
  Within 14 and 20 minutes of sildenafil dosing, 35% and 51% of sildenafil-treated patients, respectively, versus 22% and 30% of placebo-treated patients, respectively, had an erection that led to successful intercourse (P <0.05 for both). The median time to erection leading to successful intercourse after sildenafil dosing was 36 minutes compared with 141 minutes for placebo.
  
  
  CONCLUSIONS
  In this study, slightly more than one half of a population of prior sildenafil responders achieved an erection that led to successful sexual intercourse within 20 minutes of sildenafil administration, suggesting that the onset of action of sildenafil can be less than 30 minutes in men with ED.
authors.affiliation: Department of Urology, University of Southern California Keck School of Medicine, Los Angeles, California, USA.
authors.forename: H
authors.initials: H
authors.lastname: Padma-Nathan
authors.forename: V J
authors.initials: VJ
authors.lastname: Stecher
authors.forename: M
authors.initials: M
authors.lastname: Sweeney
authors.forename: J
authors.initials: J
authors.lastname: Orazem
authors.forename: L-J
authors.initials: LJ
authors.lastname: Tseng
authors.forename: H
authors.initials: H
authors.lastname: Deriesthal
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000037:antagonists & inhibitors / Q000097:blood; D003075:Coitus / Q000502:physiology*; D004311:Double-Blind Method; D007172:Erectile Dysfunction / Q000188:drug therapy* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010410:Penile Erection / Q000187:drug effects*; D010879:Piperazines / Q000008:administration & dosage* / Q000009:adverse effects / Q000097:blood; D011687:Purines; D011930:Reaction Time / Q000187:drug effects; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate; D015106:3',5'-Cyclic-GMP Phosphodiesterases