Flux-Based Formulation Development-A Proof of Concept Study.

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery
• Formulation Development

Background:

• The Absorption Driven Drug Formulation (ADDF) concept integrates solubility-permeability interplay and supersaturation rate for enhanced drug absorption.
• Traditional formulation development often overlooks the critical role of drug permeation in achieving desired absorption rates.

Purpose of the Study:

• To introduce and validate the ADDF concept through a comprehensive case study in generic formulation development.
• To demonstrate the utility of flux-based screening methods for optimizing drug product performance.

Main Methods:

• Utilized Parallel Artificial Membrane Permeability Assay (PAMPA) for initial excipient screening.
• Employed small and large volume dissolution-permeation apparatus to assess amorphous solid dispersions (ASDs) and final dosage forms.
• Investigated API-excipient interactions and their impact on drug flux.

Main Results:

• PAMPA revealed significant differences in API-excipient interactions based on filler and surfactant selection.
• Tween 80 addition to ASDs markedly reduced drug flux, confirmed by dissolution-permeation assays.
• Sorbitol demonstrated an advantage over mannitol, consistent across PAMPA, dissolution-permeation tests, and in vivo observations.

Conclusions:

• The ADDF concept provides a novel framework for generic formulation development, prioritizing absorption characteristics.
• Fast and cost-effective flux-based screening methods, integral to ADDF, facilitate meeting bioequivalence criteria.
• This approach enhances the predictability of drug product performance by incorporating permeation into formulation design.