JUN 10, 2025

Modelling amorphous solid dispersion (ASD) release mechanisms

Drug molecules with poor water solubility or limited bioavailability present significant clinical challenges. One solution is to disperse a non-crystalline form of the drug in a polymer matrix, creating an Amorphous Solid Dispersion, or ASD. When developing a new ASD drug formulation, it’s essential to understand how factors – such as drug load and surface interactions with water – influence the release of the medication. These factors can modify delivery, drive phase separation and drug crystallisation and even lead to a failure mechanism known as Loss of Release (LoR).

In this webinar, experts from AbbVie and Schrödinger will present the results of a study using a combination of perturbed-chain statistical associating fluid theory, thermodynamic modelling and molecular simulation to investigate the release mechanism and the occurrence LoR of an ASD formulation consisting of ritonavir as the active pharmaceutical ingredient in a polyvinylpyrrolidone-co-vinyl acetate matrix. This study provides insights into the potential of blending thermodynamic modelling, molecular simulation and experimental research to understand ASD formulations.

Key Learning Objectives:

  • Explore how the integration of thermodynamic modeling, molecular simulation, and experimental approaches can enhance understanding of ASD formulation behavior
  • Hear practical case studies of a complex ASD formulation that is comparable to commercially available formulations
  • Identify key areas in R&D where this combinational approach applies

Our Speakers

Stefanie Walter

Senior Scientist, AbbVie Deutschland GmbH & Co. KG

Stefanie Walter is a senior scientist in the Physical Pharmacy and Formulation Group in NCE Formulation Sciences at AbbVie Deutschland GmbH & Co. KG. Her work focuses on the thermodynamic modelling support for drug product formulation development.

Samuel Kyeremateng

Principal Scientist, AbbVie Deutschland GmbH & Co. KG

Samuel Kyeremateng is a principal research scientist at Molecular Profiling & Drug Delivery at AbbVie Deutschland GmbH & Co. KG. His team focuses on the application of in-silico physics-based approaches to aid understanding, designing, and predicting the performance and stability of pharmaceutical formulations.

Irene Bechis

Senior Scientist II, Schrödinger GmbH

Irene Bechis obtained her PhD in computational chemistry from Imperial College London and joined Schrödinger in 2023 as a Materials Science Application Scientist. Her work focuses on applying particle-scale simulation techniques to a diverse set of materials science problems, with a particular focus on polymers and pharmaceutical formulations.