How to optimize drug penetration through the skin

Area of Science:

• Dermatology
• Pharmaceutics
• Drug Delivery Systems

Background:

• The stratum corneum presents a significant barrier to topical drug absorption.
• Effective topical drug delivery requires overcoming this barrier to enhance therapeutic outcomes.

Purpose of the Study:

• To investigate the critical role of vehicle selection in enhancing transdermal drug flux.
• To explore methods for reducing stratum corneum diffusional resistance for improved drug delivery.

Main Methods:

• Analysis of drug-vehicle interactions and thermodynamic activity.
• Evaluation of factors influencing stratum corneum permeability, including enhancers and hydration.
• In vivo studies demonstrating drug flux across the skin.

Main Results:

• Vehicle selection is paramount for maximizing drug flux across the stratum corneum.
• Incorporating drugs at maximal thermodynamic activity significantly increases penetration.
• Stratum corneum resistance can be modulated by vehicle properties, enhancers, and hydration.

Conclusions:

• Strategic vehicle design is essential for successful topical drug delivery.
• Understanding and manipulating drug-vehicle and drug-skin interactions optimizes therapeutic efficacy.
• Methods to reduce skin barrier resistance offer promising avenues for enhanced transdermal therapies.