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Impact of Excipient Interactions on Solid Dosage Form Stability

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Excipient Applications in Formulation Design and Drug Delivery

Abstract

Drug-excipient interactions in solid dosage forms can affect drug product stability in physical aspects such as organoleptic changes and dissolution slowdown, or chemically by causing drug degradation. Recent research has allowed the distinction in chemical instability resulting from direct drug-excipient interactions and from drug interactions with excipient impurities. A review of chemical instability in solid dosage forms highlights common mechanistic themes applicable to multiple degradation pathways. These common themes include the role of water and microenvironmental pH. In addition, special aspects of solid-state reactions with excipients and/or excipient impurities add to the complexity in understanding and modeling reaction pathways. This paper discusses mechanistic basis of known drug-excipient interactions with case studies and provides an overview of common underlying themes. Recent developments in the understanding of degradation pathways further impact methodologies used in the pharmaceutical industry for prospective stability assessment. This paper discusses these emerging aspects in terms of limitations of drug-excipient compatibility studies, emerging paradigms in accelerated stability testing, and application of mathematical modeling for prediction of drug product stability.

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Abbreviations

Alu:

Aluminum

API:

Active pharmaceutical ingredient

ARP:

Amadori rearrangement product

BHA:

Butylated hydroxyanisole

BHT:

Butylated hydroxytoluene

GC:

Gas chromatography

HCl:

Hydrochloride

HCTZ:

Hydrochlorothiazide

HDPE:

High density polyethylene

HPLC:

High performance liquid chromatography

HPMC:

Hydroxypropyl methylcellulose

HPO:

Hydroperoxide

ICH:

International conference on harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use

LC/MS:

Liquid chromatography tandem with mass spectroscopy

MVTR:

Moisture vapor transmission rate

NF:

National Formulary

NMR:

Nuclear magnetic resonance (spectroscopy)

PEG:

Polyethylene glycol

pHmax :

pH of maximum solubility

PVA:

Polyvinyl alcohol

PVP:

Polyvinyl pyrrolidone (povidone)

PhEur:

European Pharmacopeia

PVP-VA:

Polyvinylpyrrolidone-vinyl acetate copolymer

PXRD:

Powder X-ray diffraction

SDMT:

Sorption desorption moisture transfer

ssNMR:

Solid state NMR

USP:

United States Pharmacopeia

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The majority of this chapter and illustrations are reprinted from Pharmaaceutical Research, Vol. 29 (© 2012) pp 2660–2683, with permission from Springer.

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Narang, A., Desai, D., Badawy, S. (2015). Impact of Excipient Interactions on Solid Dosage Form Stability. In: Narang, A., Boddu, S. (eds) Excipient Applications in Formulation Design and Drug Delivery. Springer, Cham. https://doi.org/10.1007/978-3-319-20206-8_5

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