The Quality of Erection Questionnaire (QEQ) is a new questionnaire that was developed to assess erectile attributes in men with erectile dysfunction. The study objective is to validate the Quality of Erection Questionnaire (QEQ) through the evaluation of subject responses to the QEQ regarding the quality and hardness of erections at baseline compared to subject responses post 6 and 10 weeks dosing with Viagra (sildenafil citrate).

Official Title

An Open-Label, Non-Comparative Study To Evaluate Treatment Responsiveness To The Quality Of Erection Questionnaire (QEQ) In Men With Erectile Dysfunction Treated With Viagra (Sildenafil Citrate)



Study Type


Study Design

Treatment, Non-Randomized, Open Label, Active Control, Single Group Assignment, Safety/Efficacy Study

Further Details

Primary Outcome Measures:

  • Treatment response to the Quality of Erection Questionnaire (QEQ) after treatment with Viagra in men with erectile dysfunction

Secondary Outcome Measures:

  • Change from baseline to week 6 of the QEQ total score
  • Change from baseline to week 6 in the 5 IIEF domain scores
  • Change from baseline in scores of QEQ individual question

Study Start

January 2005

Eligibility & Criteria

  • Ages Eligible for Study: 18 Years and above
  • Genders Eligible for Study: Male

Inclusion Criteria:

  • Subjects must have documented clinical diagnosis of erectile dysfunction based on a screening SHI-M score of <21 and the subject fulfilling the NIH definition of erectile dysfunction
  • Subjects must be either PDE-5 inhibitor naive; i.e. have never used sildenafil, tadalafil or vardenafil, or have been previously treated with no more than six doses of a PDE-5 inhibitor (sildenafil, tadalafil, vardenafil) and must have taken their last dose no less than 4 weeks prior to the screening visit

Exclusion Criteria:

  • Subjects who are currently prescribed, taking and/or likely to be treated with nitrates or nitric oxide donors in any form on either a regular or intermittent basis

Total Enrolment


Contact Details

  • Bondi Junction, New South Wales, Australia
  • St Leonards, New South Wales, Australia
  • Darlinghurst, New South Wales, Australia
  • Spring Hill, Queensland, Australia
  • ADELAIDE, South Australia, Australia
  • Malvern, Victoria, Australia
  • Mentone, Victoria, Australia
  • Clayton, Victoria, Australia
  • Nedlands, Western Australia, Australia

Contact Pfizer for more information

All content and media on the HealthEngine Blog is created and published online for informational purposes only. It is not intended to be a substitute for professional medical advice and should not be relied on as health or personal advice. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. Never disregard the advice of a medical professional, or delay in seeking it because of something you have read on this Website. If you think you may have a medical emergency, call your doctor, go to the nearest hospital emergency department, or call the emergency services immediately.