Abstract
In the current work, screening of polymers viz. polyacrylic acid (PAA), polyvinyl pyrrolidone vinyl acetate (PVP VA), and hydroxypropyl methyl cellulose acetate succinate (HPMC AS) based on drug-polymer interaction and wetting property was done for the production of a stable amorphous solid dispersion (ASD) of a poorly water-soluble drug Riluzole (RLZ). PAA showed maximum interaction and wetting property hence, was selected for further studies. Solid state characterization studies confirmed the formation of ASD with PAA. Saturation solubility, dissolution profile, and in vivo pharmacokinetic data of the ASD formulation were generated in rats against its marketed tablet Rilutor. The RLZ:PAA ASD showed exponential enhancement in the dissolution of RLZ. Predicted and observed pharmacokinetic data in rats showed enhanced area under curve (AUC) and Cmax in plasma and brain with respect to Rilutor. Furthermore, a physiologically based pharmacokinetic (PBPK) model of rats for Rilutor and RLZ ASD was developed and then extrapolated to humans where physiological parameters were changed along with a biochemical parameter. The partition coefficient was kept similar in both species. The model was used to predict different exposure scenarios, and the simulated data was compared with observed data points. The PBPK model simulated Cmax and AUC was within two times the experimental data for plasma and brain. The Cmax and AUC in the brain increased with ASD compared to Rilutor for humans showing its potential in improving its biopharmaceutical performance and hence enhanced therapeutic efficacy. The model can predict the RLZ concentration in multiple compartments including plasma and liver.
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Data Availability
The experimental data can be made available upon request. The model code will be uploaded to GITHUB and also facilitated on Rshiny server and can be provided upon request.
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Kanchan Bharti: conceptualization, methodology, formal analysis, investigation, data curation, writing — original draft, visualization, project administration. Deepika: methodology, software, validation, formal analysis, investigation, data curation, writing — original draft, visualization. Manish Kumar: methodology, investigation, data curation. Abhishek Jha: methodology, investigation, data curation. Manjit: methodology, investigation, data curation. Akhilesh: methodology, investigation, data curation. Vinod Tiwari: resources, data interpretation, writing — original draft. Vikas Kumar: resources, data interpretation, writing — original draft. Brahmeshwar Mishra: conceptualization, resources, supervision, visualization, project administration, writing — original draft and final editing.
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Bharti, K., Deepika, D., Kumar, M. et al. Development and Evaluation of Amorphous Solid Dispersion of Riluzole with PBPK Model to Simulate the Pharmacokinetic Profile. AAPS PharmSciTech 24, 219 (2023). https://doi.org/10.1208/s12249-023-02680-y
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DOI: https://doi.org/10.1208/s12249-023-02680-y