title: Effect of nightly versus on-demand vardenafil on recovery of erectile function in men following bilateral nerve-sparing radical prostatectomy.
abstract: BACKGROUND
  To date, no data have been available from large, well-designed trials comparing on demand and nightly dosing of phosphodiesterase type 5 (PDE5) inhibitors on recovery of erectile function in postprostatectomy patients with erectile dysfunction (ED).
  
  
  OBJECTIVE
  To investigate the effect of early postoperative dosing with vardenafil, administered either nightly or on demand, compared with placebo on recovery of erectile function in men with ED following bilateral nerve-sparing radical prostatectomy (NSRP) surgery.
  
  
  METHODS
  A randomised, double-blind, double-dummy, multicentre, parallel group study conducted at 87 centres across Europe, Canada, South Africa, and the United States. For inclusion, patients had to be scheduled to undergo bilateral NSRP within 1 mo of screening and have a normal International Index of Erectile Function erectile function domain (IIEF-EF) score of > or =26 at screening. A total of 628 men, aged 18-64 yr, were randomised to treatment. Study design consisted of a 9-mo double-blind treatment period, a 2-mo single-blind washout period, and an optional 2-mo open-label period.
  
  
  METHODS
  Patients received placebo, nightly vardenafil, or on demand vardenafil.
  
  
  METHODS
  Primary outcome measure was the percentage of subjects with an IIEF-EF score of > or =22 after the 2-mo washout period. Secondary variables included mean per-patient success rates for Sexual Encounter Profile (SEP) questions 2 and 3.
  
  
  CONCLUSIONS
  No statistically significant differences were observed among treatment groups in the proportion of patients with an IIEF-EF score of > or =22 or in SEP3 success rates after the washout period. On-demand vardenafil treatment resulted in significantly greater IIEF-EF scores and better SEP3 response rates than placebo over the entire treatment period.
  
  
  CONCLUSIONS
  In this study of men with ED following bilateral NSRP, vardenafil was efficacious when used on demand, supporting a paradigm shift towards on demand dosing with PDE5 inhibitors in this patient group.
  
  
  BACKGROUND
  European clinical trials database (EudraCT; available at http://eudract.emea.europa.eu/).
  
  
  BACKGROUND
  11336.
authors.affiliation: Division of Urology, Universita Vita Salute San Raffaele, Via Olgettina 60, Milan, Italy. montorsi.francesco@hsr.it
authors.forename: Francesco
authors.initials: F
authors.lastname: Montorsi
authors.forename: Gerald
authors.initials: G
authors.lastname: Brock
authors.forename: Jay
authors.initials: J
authors.lastname: Lee
authors.forename: JoAnn
authors.initials: J
authors.lastname: Shapiro
authors.forename: Hendrik
authors.initials: H
authors.lastname: Van Poppel
authors.forename: Markus
authors.initials: M
authors.lastname: Graefen
authors.forename: Christian
authors.initials: C
authors.lastname: Stief
mesh_terms: D004311:Double-Blind Method; D007172:Erectile Dysfunction / Q000188:drug therapy* / Q000209:etiology*; D006801:Humans; D007093:Imidazoles / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D010726:Phosphodiesterase Inhibitors / Q000008:administration & dosage*; D010879:Piperazines / Q000008:administration & dosage*; D011467:Prostate / Q000294:innervation; D011468:Prostatectomy / Q000009:adverse effects* / Q000379:methods*; D020127:Recovery of Function; D013450:Sulfones / Q000008:administration & dosage; D014227:Triazines / Q000008:administration & dosage; D000069058:Vardenafil Dihydrochloride
chemical_list: D007093:Imidazoles; D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D013450:Sulfones; D014227:Triazines; D000069058:Vardenafil Dihydrochloride