Using Pharmacokinetic Parameters from in vitro Permeation Test Data for Predicting Multiple-Dose Penetration Profiles

Area of Science:

• Pharmacokinetics
• Dermal Drug Delivery
• Biopharmaceutics

Background:

• Complex mathematical models exist for percutaneous absorption using IVPT data.
• A simpler pharmacokinetic approach is proposed for predicting skin absorption and barrier content.

Purpose of the Study:

• To develop and validate a simplified pharmacokinetic model for predicting percutaneous absorption kinetics.
• To estimate skin barrier content and permeation profiles after multiple topical applications.

Main Methods:

• Utilized published and archived in vitro permeation test (IVPT) data.
• Applied standard single-compartment pharmacokinetic parameters to IVPT data.
• Derived pharmacokinetic parameters to predict multiple-dose absorption.

Main Results:

• Pharmacokinetic parameters were derived for various drugs from IVPT data.
• Predicted multiple-dose absorption kinetics, flux profiles, and skin barrier content.
• Calculations covered 7-30 day periods with varied dosing intervals (6, 12, 24h).

Conclusions:

• The model accurately predicts the rate and extent of drug absorption over multiple doses and days.
• Provides insights for formulation selection and dosing regimen optimization.
• Enables estimation of skin and systemic exposure levels from topical applications.