Optimizing Extended-release Formulation of l-tetrahydropalmatine Based on In Vivo Outcomes Using Integrated Modeling
Thi-Phuong-Dung Pham1,2, Huy Minh Dao3, Nguyen-My-Linh Pham1
1Faculty of Pharmaceutics and Pharmaceutical Technology, Hanoi University of Pharmacy, 13-15 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam.
AAPS Pharmscitech
|June 25, 2025
Summary
This study optimized extended-release l-Tetrahydropalmatine (l-THP) formulations for addiction treatment using computational tools. The optimized formulation ensures safety and efficacy with a predictable onset and prolonged duration of action.
Area of Science:
- Pharmacology
- Pharmaceutics
- Computational Drug Delivery
Background:
- l-Tetrahydropalmatine (l-THP) shows promise for addiction treatment but requires extended-release formulations for optimal safety and efficacy.
- Achieving desired in vivo pharmacokinetic profiles (Cmax, onset, duration) is crucial for effective drug delivery.
Purpose of the Study:
- To optimize extended-release l-THP formulations using integrated computational tools.
- To establish an in vitro-in vivo correlation (IVIVC) for predicting drug release and absorption.
- To develop and validate a physiologically based pharmacokinetic (PBPK) model for simulating l-THP behavior in vivo.
Main Methods:
- Utilized Design of Experiments (DoE) combined with PBPK modeling to optimize hydrophilic matrix tablet formulations.
- Established a Level A IVIVC to select an in vivo predictable dissolution method (USP Apparatus I, 450 ml 0.1 N HCl, 100 rpm).
- Validated the PBPK model against U.S. FDA prediction error criteria to assess its accuracy in predicting l-THP pharmacokinetics.
Main Results:
- A Level A IVIVC was successfully established, linking in vitro dissolution to in vivo absorption.
- The PBPK model accurately predicted l-THP pharmacokinetics and identified dissolution and gut first-pass extraction as critical factors.
- The optimized formulation demonstrated an estimated early onset of action (0.68 h) and a duration exceeding 11.4 h, with Cmax within the therapeutic window.
Conclusions:
- Integrated IVIVC, PBPK, and DoE provide a robust platform for designing extended-release drug delivery systems.
- The optimized l-THP formulation offers a promising profile for addiction treatment, balancing efficacy and safety.
- This computational approach is adaptable for designing other drug delivery systems with tailored in vivo performance.
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