Abstract
Purpose
The aim of the present work was to classify metaxalone according to the Biopharmaceutics Classification System (BCS), to develop a clinically relevant dissolution method that can be used to predict the oral absorption of metaxalone and to establish an in vitro-in vivo correlation (IVIVC).
Methods
Solubility of the drug was studied in different pH media and permeability studies were performed using a Caco-2 cell model. The in vitro dissolution and in vivo disposition of metaxalone from 3 different immediate release (IR) tablet formulations were investigated using USP 2 apparatus and a single dose, four-way, crossover bioequivalence study in healthy humans along with an oral solution of the drug, respectively. An IVIVC was established by using a direct, differential based method.
Results
Metaxalone has been confirmed as a Class II drug according to BCS. Bioavailability studies performed in humans demonstrated that dissolution was the rate limiting step for bioavailability of the drug and one of the test products had significantly improved bioavailability compared to the marketed product Skelaxin®. An IVIVC model was developed that demonstrated an acceptable internal predictability.
Conclusion
The IVIVC demonstrated that formulation factors play a significant role in dissolution and absorption of metaxalone. A pH 4.5 dissolution medium containing 0.5% NaCl with 0.2% SLS (USP apparatus 2 at 50 rpm) is clinically relevant to predict bioavailability of the drug and is superior to the USP method in terms of the Quality by Design (QbD) concept.
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Abbreviations
- AB:
-
Apical to basolateral
- ANOVA:
-
Analysis of variance
- AUCt :
-
Area under the curve from time zero to time of last non-zero concentration
- BA:
-
Basolateral to apical
- BCS:
-
Biopharmaceutics classification system
- Caco-2:
-
Human colonic adenocarcinoma cells
- Cmax :
-
Maximum observed concentration
- DDE:
-
Direct, differential equation
- DMEM:
-
Dulbecco’s modified Eagle's medium
- EMA:
-
European medicines agency
- FDA:
-
Food and drug administration
- HEPES:
-
Hank’s balanced salt solution
- HPLC:
-
High pressure liquid chromatographic
- HPMC:
-
Hydroxypropylmethyl cellulose 6cp
- ICH:
-
International conference on harmonization
- IR:
-
Immediate release
- IVIVC:
-
In vitro-in vivo correlation
- K2EDTA:
-
Dipotassium ethylenediaminetetraacetic (edetic) acid
- LC MSD:
-
Liquid chromatography with mass spectrometry detection
- LLOQ:
-
Lower limit of quantification
- NEAA:
-
Nonessential amino acids solution
- PE:
-
Prediction errors
- PK:
-
Pharmacokinetic
- PVP:
-
Povidone K30
- QbD:
-
Quality by design
- QC:
-
Quality control
- SLS:
-
Sodium lauryl sulfate
- TEER:
-
Transepithelial electrical resistance
- USP:
-
United States Pharmacopeia
- UV:
-
Ultraviolet
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ACKNOWLEDGMENTS AND DISCLOSURES
We would like to thank Ms. Teresa Wloch of PLIVA Krakow Research and Development and Ms. Zdravka Tadić for their technical assistance in preparing Test formulations (A, B and oral solution). This work has been supported by Pliva Croatia Ltd. and in part by Croatian Science Foundation under the project 3526.
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All procedures performed in this study involving human participants were in accordance with the ethical standards of the institution and/or national research committee and with the 1946 Helsinki declaration and its later amendments or comparable ethical standards.
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Guest Editors: Kin Yip Tam, Zoran Mandic, and Tonglei Li
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Vuletić, L., Khan, M.Z.I., Špoljarić, D. et al. Development of a Clinically Relevant Dissolution Method for Metaxalone Immediate Release Formulations Based on an IVIVC Model. Pharm Res 35, 163 (2018). https://doi.org/10.1007/s11095-018-2434-1
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DOI: https://doi.org/10.1007/s11095-018-2434-1