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Sildenafil (Viagra)

Also known as Sildenafil

Half-life

~4 hours

What is Sildenafil (Viagra)?

Shorter-acting PDE5 inhibitor for erectile dysfunction and pulmonary pressure support.

How Sildenafil (Viagra) works

PDE5 inhibition prolongs NO-cGMP signaling and smooth-muscle relaxation in penile/pulmonary vasculature.

Benefits & uses

Common uses: Erectile dysfunction, pulmonary hypertension.

Sildenafil (Viagra) dosage

Protokol doesn't recommend doses for prescription or controlled compounds. Any figures below are reference or observational reports — dosing should be set with a qualified clinician.

Reference range
Prescription-dependent (as needed before activity); doctor-directedClinical or reference range, not a personal recommendation.

Sildenafil (Viagra) half-life

~4 hours

Sildenafil (Viagra) side effects

  • Headache
  • Visual blue tinge
  • Hypotension with nitrates
  • Facial flushing
  • Nasal congestion
  • Visual color-tinge (temporary)
  • Indigestion

Warnings & monitoring

  • Prescription medication — requires a doctor. 🔴 NEVER combine with nitrates (dangerous blood-pressure drop). Caution with heart conditions/alpha-blockers.

Track Sildenafil (Viagra) in Protokol.

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More Medication

For research and educational purposes only. This page is not medical advice and is not a recommendation to use any compound. Many compounds listed are not approved for human use, and some are prescription-only or controlled in your jurisdiction. Dosing figures are reference or observational reports. Talk to a qualified healthcare provider before starting, stopping, or changing anything. Protokol is for tracking purposes only.