Healthy Volunteer Study of Sildenafil Effects Upon Vision

A Double-Blind, Randomised, Placebo Controlled Healthy Volunteer Study to Investigate the Nature and Origin of the Disturbance of Vision Induced by Single Oral Doses of Sildenafil

Status

Completed

Phases

Phase 4

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00251784

Enrollment

Unknown

Registered

2005-11-10

Start date

2002-02-28

Completion date

2003-06-30

Last updated

2005-11-10

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Blindness

Brief summary

Patients sometimes report subjective visual effects when taking sildenafil. Our study set out to measure these in a controlled setting. Subjects were asked to detect patterns presented on a monitor screen.

Interventions

DRUGSildenafil

Study design

Allocation

RANDOMIZED

Intervention model

CROSSOVER

Primary purpose

ECT

Masking

DOUBLE

Eligibility

Sex/Gender

MALE

Age

18 Years to No maximum

Healthy volunteers

Yes

Inclusion criteria

male -

Exclusion criteria

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026