Compare Supplements

Side-by-side comparison of 2 supplements

Sil3.8

Sildenafil (Viagra)

Moderate safety

Var3.6

Vardenafil (Levitra)

Moderate safety

Evidence

Evidence Score3.8/10

Studies: 6

Meta-analyses: 1

Evidence Score3.6/10

Studies: 6

Meta-analyses: 1

Dosage & timing

Dosage:

Approved on-demand ED dosing is 25-100 mg taken ~30-60 minutes before activity (50 mg typical start). PAH dosing (Revatio) is 20 mg three times daily. Any off-label use is clinician-directed; this is not an approved longevity regimen.

Best Time:

Any time

Can take on empty stomach

Form:

Oral tablet (sildenafil citrate)

Dosage:

Approved on-demand ED dosing is 5-20 mg taken ~30-60 minutes before activity (10 mg typical start for the film-coated tablet); the orodispersible Staxyn tablet is 10 mg. Any use is clinician-directed and prescription-only; this is not a supplement regimen.

Best Time:

Any time

Can take on empty stomach

Form:

Oral film-coated tablet (vardenafil HCl)

What you'll notice

💪 Erectile dysfunction (proven)positive

Acute (~30-60 min onset)

🫁 Pulmonary arterial hypertension (proven)positive

Weeks

🧠 Possible lower dementia risk (associational)trade-off

Years

💪 Erectile dysfunction (proven)positive

Acute (~30-60 min onset)

🩺 Works in difficult populations (proven)positive

Weeks

🤕 Headache, flushing, rhinitisnegative

Acute (per dose)

Safety

Moderate safety

Contraindications:

Concurrent nitrates (any form)
Recent cardiovascular event / unstable angina
Severe hypotension

Drug Interactions:

Nitrates
Alpha-blockers / antihypertensives
Strong CYP3A4 inhibitors

Side Effects:

Headache / flushingDyspepsia / nasal congestion / blue-tinged or blurred visionPriapism / NAION (sudden vision loss) / sudden hearing loss / symptomatic hypotension

Moderate safety

Contraindications:

Concurrent nitrates (any form)
Congenital long-QT syndrome or concurrent Class IA/III antiarrhythmics or other QT-prolonging drugs
Recent cardiovascular event / unstable angina

Drug Interactions:

Nitrates
QT-prolonging drugs / Class IA and III antiarrhythmics
Alpha-blockers / antihypertensives

Side Effects:

Headache / flushingRhinitis (nasal congestion) / dyspepsiaQT-interval prolongation

How they work together

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