Evidence question

PubMed sourcedAbstract-based analysisUpdated Sep 2026

Evidence / Men's Sexual Health

CoverageMen's Sexual Health

Do sildenafil, tadalafil, and vardenafil differ in effectiveness for erectile dysfunction?

Updated Sep 2026·12 studies analyzed·2 core studies·Applies to: hypogonadal men

Bottom line

All three major PDE5 inhibitors improve erectile function versus placebo with broadly similar efficacy in meta-analyses. Differences in onset, duration, food interactions, and side-effect profiles often matter more than marginal efficacy differences for most patients.[1–6]

Evidence confidence

Evidence Confidence

High
LimitedModerateHigh

Multiple high-quality studies directly address this question, with generally consistent findings.

Key uncertainty. Blinded head-to-head trials are limited; patient preference dominates selection.

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Also asked

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All three major PDE5 inhibitors improve erectile function versus placebo with broadly similar efficacy in meta-analyses. Differences in onset, duration, food interactions, and side-effect profiles often matter more than marginal efficacy differences for most patients.

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All three major PDE5 inhibitors improve erectile function versus placebo with broadly similar efficacy in meta-analyses. Differences in onset, duration, food interactions, and side-effect profiles often matter more than marginal efficacy differences for most patients.

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All three major PDE5 inhibitors improve erectile function versus placebo with broadly similar efficacy in meta-analyses. Differences in onset, duration, food interactions, and side-effect profiles often matter more than marginal efficacy differences for most patients.

Body of evidence

Clinical Evidence Brief

RAGMD analyzed 6 relevant studies.

Overall finding

6 studies address erectile function, with weighted findings showing benefit. 2 studies address sexual desire, with weighted findings showing benefit. 2 studies address sexual activity, with weighted findings showing benefit. 2 randomized or systematic-review reports and 0 observational studies address treatment. Choose among sildenafil, tadalafil, and vardenafil based on onset, duration, food interactions, and side-effect tolerance rather than marginal efficacy differences in meta-analyses.

Evidence by outcome

Direction: ↑ Favors treatment / reassuring · ↓ Harm signal · ↔ No clear effect · ± Mixed · ↗ Observational link · ? Unclear

Favors treatment

Erectile function

moderate · 6 studies

6 studies address erectile function, with weighted findings showing benefit.

Mixed measurement

Studies

PMID 28434676PMID 27355400PMID 9580646PMID 15470128PMID 16398931PMID 21679942
Favors treatment

Sexual desire

high · 2 studies

2 studies address sexual desire, with weighted findings showing benefit. This is a patient-reported / subjective outcome.

Patient-reported

Studies

PMID 28434676PMID 27355400
Favors treatment

Sexual activity

high · 2 studies

2 studies address sexual activity, with weighted findings showing benefit. This is a patient-reported / subjective outcome.

Patient-reported

Studies

PMID 28434676PMID 27355400

Magnitude / clinical importance

Validated effect estimates in the analyzed set include mean difference=2.31; or 100. Statistical significance is not the same as clinical importance.

Interpret magnitude in absolute terms for the patient in front of you, not from relative estimates alone.

Agreement across studies

Findings are mixed after weighting by design, quality, and directness.

Supports main conclusion: 3 · Neutral / mixed: 3 · Credible conflicting: 0

Study counts describe the landscape; RAGMD weights studies according to design, quality, and directness.

Conflicting findings

  • Oral sildenafil is an effective, well-tolerated treatment for men with erectile dysfunction.
  • Two large tetracycline resistance (TcR) plasmids have been completely sequenced, the pTet plasmid (45.2 kb) from Campylobacter jejuni strain 81-176 and a plasmid pCC31 (44.7 kb) from Campylobacter co…

Who this applies to

Most studies included hypogonadal men.

What remains uncertain

  • Blinded head-to-head trials are limited; patient preference dominates selection.
  • Blinded head-to-head trials are limited; patient preference dominates selection.

Clinical takeaway

Choose among sildenafil, tadalafil, and vardenafil based on onset, duration, food interactions, and side-effect tolerance rather than marginal efficacy differences in meta-analyses.

Favors treatment

Erectile function?

Benefit

moderate[28434676 · 27355400 · 9580646 · 15470128 · 16398931 · 21679942]

Favors treatment

Sexual desire?

Benefit

high[28434676 · 27355400]

Favors treatment

Sexual activity?

Benefit

high[28434676 · 27355400]

2 randomized or systematic-review reports and 0 observational studies address treatment. Weighted treatment findings show benefit.

2 RCT / systematic review · 0 observational

Large randomized trials strongly influence the conclusion

2 landmark studies with randomized or systematic-review designs strongly inform this conclusion.

Supporting studies provide additional context

10 supporting studies add context beyond the core evidence base.

Regimen & duration

Differences in hormone type, dose, duration, and patient population affect how results should be interpreted.

Long-term uncertainty

Evidence beyond long follow-up windows and in certain subgroups remains less complete.

6 analyzed studies

Strongest evidence

Supporting literature

Meta-analysis of Results of Testosterone Therapy on Sexual Function Based on International Index of Erectile Function Scores.

Testosterone Treatment and Sexual Function in Older Men With Low Testosterone Levels.

Oral sildenafil in the treatment of erectile dysfunction. Sildenafil Study Group.

+7 more

More in this focus area

Related evidence analyses

Other structured clinical questions in Men's Sexual Health.

How effective are PDE5 inhibitors for erectile dysfunction?

PDE5 inhibitors substantially improve erectile function versus placebo across broad ED populations, with landmark trials showing clinically meaningful IIEF improvements. On-demand dosing before sexual activity is standard; response rates are high though not universal.

12 linked studies

Is daily low-dose tadalafil better than on-demand dosing for erectile dysfunction?

Both daily low-dose and on-demand tadalafil improve erectile function. Daily dosing may improve spontaneity and lower urinary symptom scores in men with comorbid LUTS, while on-demand dosing minimizes drug exposure for men with infrequent sexual activity.

12 linked studies

Are PDE5 inhibitors safe for cardiovascular disease in men with erectile dysfunction?

In stable cardiovascular disease, PDE5 inhibitors do not appear to increase major adverse cardiac events when used appropriately and nitrate co-administration is avoided. Sexual activity itself carries modest cardiovascular demand; individualized assessment remains important after recent events.

12 linked studies

Why are PDE5 inhibitors contraindicated with nitrates?

Combined PDE5 inhibition and nitric oxide donor therapy can produce profound synergistic vasodilation and symptomatic hypotension. Nitrates and PDE5 inhibitors should not be used together; allow appropriate washout intervals when switching between agents in acute coronary care.

12 linked studies

Go deeper on Men's Sexual Health

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