In vitro/in vivo correlations in transdermal product development

Area of Science:

• Pharmacokinetics and Drug Delivery
• Transdermal Drug Delivery Systems
• Regulatory Science

Background:

• In vitro-in vivo correlations (IVIVC) are established by the US FDA for oral extended-release dosage forms to support bioequivalence studies and post-approval changes.
• Currently, transdermal IVIVC is not utilized to support biowaiver claims in late-stage clinical development or for significant post-approval formulation modifications.

Purpose of the Study:

• To introduce the concept and applicability of transdermal in vitro-in vivo correlations (IVIVC).
• To outline the limitations, methodologies, and regulatory considerations for establishing transdermal IVIVC.
• To summarize challenges, recent advancements, and academic examples in the field of transdermal IVIVC.

Main Methods:

• Review of US FDA guidance on IVIVC for oral dosage forms.
• Discussion of in vitro and in vivo methods relevant to transdermal drug permeation.
• Analysis of regulatory requirements for transdermal drug product development.
• Exploration of common approaches for establishing transdermal IVIVC.
• Summary of academic case studies and recent advancements.

Main Results:

• Transdermal IVIVC can significantly reduce the cost and time associated with transdermal drug candidate evaluation and formulation optimization.
• The development of transdermal IVIVC is valuable for facilitating permeation testing and optimizing formulation performance.
• Despite current limitations in regulatory acceptance for biowaivers, transdermal IVIVC presents a promising tool for efficient drug development.

Conclusions:

• Transdermal IVIVC offers a valuable, cost-effective approach for optimizing transdermal drug delivery systems and permeation testing.
• Further research and regulatory dialogue are needed to expand the application of transdermal IVIVC in supporting biowaiver claims and post-approval changes.
• The presented overview of methods, challenges, and advancements aims to guide future development and implementation of transdermal IVIVC.