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In vitro release test (IVRT): Principles and applications.

Vinod P Shah¹, Dalia Simona Miron², Flavian Ștefan Rădulescu²

¹Pharmaceutical Consultant, 11309 Dunleith Place, North Potomac, MD 20878, USA.

International Journal of Pharmaceutics

|September 6, 2022

Summary

In vitro drug release testing (IVRT) is crucial for developing and approving topical semisolid drug formulations. This essential method evaluates drug release, aiding in formulation comparison and regulatory submissions.

Keywords:

IVRT In vitro release SUPAC-SS TCS Topical drugs

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Area of Science:

Pharmaceutical Sciences
Drug Delivery Systems
Topical Formulations

Background:

In vitro drug release testing (IVRT) is a critical tool in the development and regulatory approval of semisolid dosage forms.
IVRT assesses physicochemical characteristics like viscosity and microstructure, influencing drug release kinetics.
It provides insights into the combined effects of formulation properties on drug release.

Purpose of the Study:

To discuss the principles and evolution of IVRT for semisolid topical formulations.
To highlight the correlation between IVRT and in vivo pharmacodynamic responses.
To explore the role of IVRT in assessing formulation similarity within regulatory frameworks.

Main Methods:

Review of the genesis and principles of in vitro drug release testing.
Analysis of the relationship between IVRT and pharmacodynamic endpoints (e.g., vasoconstriction, dermatopharmacokinetics).
Discussion of regulatory requirements and the Topical drug Classification System (TCS) for formulation assessment.

Main Results:

IVRT effectively reflects formulation characteristics and drug release profiles.
A rank order relationship exists between IVRT and pharmacodynamic responses.
IVRT is integral to comparing topical formulations for similar drug release rates and quantities.

Conclusions:

In vitro drug release testing is an indispensable tool for topical drug development and approval.
IVRT supports the assessment of formulation similarity, particularly microstructural arrangement (Q3), complementing qualitative and quantitative composition (Q1, Q2) evaluations.
The evolution towards 'similar' (Q1, Q2, Q3) allows for greater flexibility in formulation modifications while ensuring therapeutic equivalence.