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The Implications of Drug-Polymer Interactions on the Physical Stability of Amorphous Solid Dispersions

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Abstract

Amorphous solid dispersions (ASDs) are a formulation and development strategy that can be used to increase the apparent aqueous solubility of poorly water-soluble drugs. Their implementation, however, can be hindered by destabilization of the amorphous form, as the drug recrystallizes from its metastable state. Factors such as the drug-polymer solubility, miscibility, mobility, and nucleation/crystal growth rates are all known to impact the physical stability of an ASD. Non-covalent interactions (NCI) between the drug and polymer have also been widely reported to influence product shelf-life. In this review, the relationship between thermodynamic/kinetic factors and adhesive NCI is assessed. Various types of NCIs reported to stabilize ASDs are described, and their role in affecting physical stability is examined. Finally, NCIs that have not yet been widely explored in ASD formulations, but may potentially impact their physical stability are also briefly described. This review aims to stimulate further theoretical and practical exploration of various NCIs and their applications in ASD formulations in the future.

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  1. School of Pharmacy and Graduate School of Pharmaceutical Sciences, Duquesne University, 600 Forbes Avenue, 422C Mellon Hall, Pittsburgh, PA, 15282, USA

    Mustafa Bookwala & Peter L. D. Wildfong

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Bookwala, M., Wildfong, P.L.D. The Implications of Drug-Polymer Interactions on the Physical Stability of Amorphous Solid Dispersions. Pharm Res 40, 2963–2981 (2023). https://doi.org/10.1007/s11095-023-03547-4

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