Eardley Sildenafil Onset Study: Key Findings Explained in Plain Language
Sildenafil produced an 82% response rate, with clinical onset occurring as early as 12 minutes after dosing.
Study overview
Conducted by
Dr. I. Eardley et al., multi-center European study
Patients
Men with erectile dysfunction across severity ranges
Duration
12 weeks (randomized, placebo-controlled)
Published in
International Journal of Clinical Practice
Year
2002
Key findings
82% overall response rate
82% of men treated with sildenafil reported improved erections sufficient for intercourse. This high response rate held across mild, moderate, and severe ED classifications.
Onset as early as 12 minutes
While the standard recommendation is 30-60 minutes before activity, measurable erectile response occurred as early as 12 minutes post-dose in some patients. Sublingual or dissolved formats may accelerate this further.
Peak plasma concentration at 30-60 minutes
Maximum blood levels of sildenafil occur 30-60 minutes after oral dosing on an empty stomach. High-fat meals delay this by up to 60 minutes.
Duration of action 4-6 hours
The effective window for sildenafil is 4-6 hours. This is shorter than tadalafil's 36-hour window but provides a strong, focused response during the active period.
What this means for you
An 82% response rate with onset as fast as 12 minutes makes sildenafil one of the most reliable acute ED treatments available. The rapid onset is particularly relevant for the gummy format -- sublingual absorption through the oral mucosa can further accelerate onset compared to standard tablets that must pass through the stomach.
Limitations
The 12-minute onset was observed in a subset of patients, not the majority. Average onset is 30-60 minutes. The study used standard oral tablets, not sublingual or gummy formats. Response rates may be lower in patients with severe diabetes or post-prostatectomy ED.
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