The First-Pass Problem
When you swallow a conventional sildenafil tablet, the active ingredient takes a detour. It dissolves in stomach acid, crosses the intestinal lining, and enters the hepatic portal vein, meaning it passes through the liver before reaching systemic circulation. This "first-pass metabolism" can degrade 60 to 70 % of the dose before it ever reaches the bloodstream.
How Buccal Absorption Changes the Equation
An oral spray deposits micro-droplets across the buccal and sublingual mucosa, the thin, highly vascularised tissue inside the mouth. Because venous drainage from this area flows directly into the superior vena cava, the drug bypasses hepatic first-pass metabolism entirely.
In a 56-subject crossover study, HEZKUE® achieved detectable plasma sildenafil concentrations at T+5 minutes, a timepoint at which the comparator tablet showed zero measurable absorption.
What This Means in Practice
Faster onset is not just a convenience metric. For many patients, the 45 to 60 minute planning window required by tablets is the primary source of psychological burden. Reducing that window to single-digit minutes changes the experience from "scheduled medication" to "on-demand confidence."
Food and Alcohol Interactions
A high-fat meal can delay tablet absorption by over an hour. Because buccal absorption bypasses the GI tract, HEZKUE® maintains its rapid onset profile regardless of recent food or alcohol intake.
The Bioequivalence Data
Despite the faster onset, total drug exposure (AUC) remains bioequivalent to the reference tablet, meaning you get the same therapeutic effect, just delivered more efficiently.