Abstract
Contemporary small-molecule drug candidates increasingly have limited aqueous solubility, rendering oral delivery challenging. Amorphous solid dispersions (ASDs) and lipid-based formulations (LBFs) have evolved as leading formulation approaches to mitigate solubility and dissolution rate limitations. There is an increasing trend towards ASD formulations for drug candidates with high melting points and LBFs for extremely lipophilic molecules. Mechanistic assessment of LBF and ASD enhancement pathways reveals a surprising amount of commonality, notably that supersaturation generation and maintenance are likely key to obtaining optimized in vivo performance for both formulation types. An expanding formulation design space is blurring the distinction between these solubility enhancement technologies and further evolution in this direction is likely necessary to address the oral delivery of even more challenging molecules, such as proteolysis-targeting chimeras and macrocyclic peptides.
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C.J.H.P. acknowledges funding from National Health and Medical Research Council Investigator Grant APP1177084 and Australian Research Council Linkage Grant LP220200944.
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K.U. and C.J.H.P. were involved in conceptualization, writing the original draft, review and editing of the article, and literature analysis. A.G. was involved in conceptualization, writing the original draft, and review and editing of the article. L.S.T. was involved in conceptualization, writing the original draft, review and editing of the article, and literature analysis and editing.
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C.J.H.P. is an inventor on intellectual property (IP) related to a triglyceride-mimetic prodrug technology that is briefly described in this Perspective and was licensed from Monash University to Seaport Therapeutics. L.S.T. has served as a consultant or paid speaker, may own shares or has received recent research funding from the following companies whose products are mentioned in this submission: Pfizer, Eli Lilly, AstraZeneca, Bristol Myers Squibb, Johnson and Johnson, AbbVie and Merck. The remaining authors declare no competing interests.
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Ueda, K., Porter, C.J.H., Goodwin, A. et al. The expanding role of formulations to enable oral delivery of poorly water-soluble drugs. Nat Rev Drug Discov (2026). https://doi.org/10.1038/s41573-026-01407-5
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DOI: https://doi.org/10.1038/s41573-026-01407-5