Efficacy of extended-release doxazosin and doxazosin standard in patients with concomitant benign prostatic hyperplasia and sexual dysfunction

BJU Int. 2005 Jan;95(1):103-9; discussion 109. doi: 10.1111/j.1464-410X.2004.05252.x.


Objective: To report a comprehensive retrospective analysis of the favourable effects of doxazosin extended-release (XL) and doxazosin standard on the sexual health of patients with comorbid benign prostatic hyperplasia (BPH) and erectile dysfunction (ED), augmenting a previous study of 680 patients with symptomatic BPH.

Patients and methods: Men with BPH and aged 50-80 years participated in a randomized, double- blind, double-dummy, parallel-group, multicentre trial, completing a 2-week, single-blind, placebo run-in period before receiving doxazosin XL 4 or 8 mg once daily or doxazosin standard 1-8 mg once daily for 13 weeks. Baseline sexual function and changes from baseline after treatment with doxazosin were evaluated from responses of the International Index of Erectile Function (IIEF) questionnaire (with dysfunction defined as a score of < or = 3 for any question) and the five domains for erectile function (intercourse satisfaction, orgasmic function, sexual desire and overall sexual satisfaction).

Results: Of 680 patients randomized into the trial, 237 (35%) had ED at baseline; in these patients there were statistically and clinically significant improvements in each of the five IIEF domains with XL and standard doxazosin (P < or = 0.0019), with the range of improvement being from 13% to 41%. There were no significant differences between treatment groups. Doxazosin XL consistently improved sexual function, as assessed by the individual questions of the IIEF questionnaire. There was no statistically significant difference between groups for any sexual function question analysed.

Conclusion: Doxazosin XL and standard improved sexual function in men with concomitant BPH and ED at baseline. This may represent an action independent of relieving lower urinary tract symptoms, because the beneficial effect of doxazosin was reported in patients with no symptomatic BPH.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenergic alpha-Antagonists / administration & dosage*
  • Aged
  • Aged, 80 and over
  • Delayed-Action Preparations / administration & dosage
  • Double-Blind Method
  • Doxazosin / administration & dosage*
  • Erectile Dysfunction / complications
  • Erectile Dysfunction / drug therapy*
  • Humans
  • Libido / drug effects
  • Male
  • Middle Aged
  • Patient Satisfaction
  • Prostatic Hyperplasia / complications
  • Prostatic Hyperplasia / drug therapy*
  • Treatment Outcome


  • Adrenergic alpha-Antagonists
  • Delayed-Action Preparations
  • Doxazosin