Combined PK modeling predicts how dulaglutide's delay of gastric emptying affects the absorption and blood levels of other oral medications.
Combined modelPopPK + PBPK approach predicts drug-drug interactions from GLP-1-induced gastric emptying delay
What the researchers found
A combined PopPK/PBPK model accurately predicts how dulaglutide-induced gastric emptying delay affects oral drug absorption and pharmacokinetics.
Why it matters
Patients on GLP-1 drugs often take multiple medications — predicting drug interactions computationally saves time and money versus running new clinical trials.
The numbers in context
Model verified against clinical DDI data at low dulaglutide doses; predicted changes in AUC, Cmax, and tmax of co-administered drugs at higher doses.
How the study worked
Combined population pharmacokinetic and physiologically-based pharmacokinetic modeling validated against clinical study data.
Who was studied
Healthy participants and patients with type 2 diabetes (from source clinical studies)
What this study cannot tell us
Model predictions require validation for each specific drug combination. May not capture all patient-specific variability.
How to read the evidence
Computational modeling validated against clinical data — strong predictive framework but each drug interaction needs individual validation.
When this study was published
Published in 2025, providing a modern modeling tool for GLP-1 drug interaction prediction.
The bigger picture
This modeling approach could be applied to predict drug interactions for any GLP-1 drug, not just dulaglutide.
Questions still open
- Which commonly co-administered medications are most affected by GLP-1 gastric delay?
- Can this model be applied to semaglutide and tirzepatide?
Common questions
Do GLP-1 drugs affect other medications?
Should I adjust my other medications when starting a GLP-1 drug?
Read the original research
A Combined Modeling Approach to Predict the Effect of Gastric Emptying Delay on the Pharmacokinetics of Small Molecules.
CPT: pharmacometrics & systems pharmacology, 14(12), 2026-2039
Citation
Posada, Maria M; Schneck, Karen B; Morse, Bridget L; Rougee, Luc R A; Tham, Lai San; Rehmel, Jessica F; Thompson, Brian; Stamatis, Stephen D; Hall, Stephen D; Dickinson, Gemma L. (2025). A Combined Modeling Approach to Predict the Effect of Gastric Emptying Delay on the Pharmacokinetics of Small Molecules.. CPT: pharmacometrics & systems pharmacology, 14(12), 2026-2039. https://doi.org/10.1002/psp4.70101