Solid Dispersion Formulation
Solid Dispersion Formulation Technology · Also known as: solid solution, amorphous dispersion, polymer-based formulation
Solid dispersion is a formulation technique where a poorly soluble drug is molecularly dispersed in a hydrophilic polymer matrix, improving aqueous solubility and bioavailability. Introduced by Chiou and Riegelman in 1971, solid dispersions remain a key strategy for overcoming solubility-limited absorption.
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When to use it
Use solid dispersion formulation when improving dissolution rate and oral bioavailability of Biopharmaceutics Classification System (BCS) Class II or IV drugs with poor aqueous solubility — particularly when conventional approaches (particle size reduction, salt formation) are insufficient to achieve therapeutic drug levels.
Strengths & limitations
- Dramatically improves dissolution: amorphous drug dispersed in a hydrophilic polymer matrix dissolves far faster than crystalline drug
- Established technology: hot-melt extrusion and spray drying are scalable, GMP-compatible manufacturing platforms
- Excipient flexibility: wide range of approved polymers (HPMC, PVP, Eudragit) and plasticizers available
- Multiple approved products: Kaletra, Zelboraf, and others demonstrate regulatory and clinical viability
- Suitable for thermolabile drugs (spray drying): avoids high-temperature processing required for hot-melt extrusion
- Physical instability: amorphous drug can recrystallize on storage, reverting to poor-solubility crystalline form
- Moisture sensitivity: hygroscopic polymers absorb water, plasticizing the matrix and promoting crystallization
- Drug loading limits: high drug loads (>40%) often compromise stability; polymer-rich formulations increase tablet size
- Manufacturing complexity: hot-melt extrusion requires careful temperature control; spray drying needs solvent handling infrastructure
- Supersaturation maintenance: improved dissolution in vitro does not always translate to improved in vivo absorption without precipitation inhibitors
Sources
- Chiou, W. L., Riegelman, S. (1971). Pharmaceutical applications of solid dispersions. Journal of Pharmaceutical Sciences, 60(9), 1281-1302. link ↗
- Vasconcelos, T., Sarmento, B., & Costa, P. (2007). Solid dispersions as strategy to improve oral bioavailability of poorly water soluble drugs. Drug Discovery Today, 12(23-24), 1068-1075. DOI: 10.1016/j.drudis.2007.09.005 ↗
How to cite this page
ScholarGate. (2026, June 3). Solid Dispersion Formulation Technology. ScholarGate. https://scholargate.app/en/pharmacology/solid-dispersion
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
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