ABSTRACT
Purpose
To understand the relationship between the risk of opioid-related gastrointestinal adverse effects (AEs) and exposure to tapentadol and oxycodone as well as its active metabolite, oxymorphone, using pharmacokinetic/pharmacodynamic models.
Methods
The analysis was based on a study in patients with moderate-to-severe pain following bunionectomy. Population PK modeling was conducted to estimate population PK parameters for tapentadol, oxycodone, and oxymorphone. Time to AEs was analyzed using Cox proportional-hazards models.
Results
Risk of nausea, vomiting, and constipation significantly increased with exposure to tapentadol or oxycodone/oxymorphone. However, elevated risk per drug exposure of AEs for tapentadol was ~3–4 times lower than that of oxycodone, while elevated AE risk per drug exposure of oxycodone was ~60 times lower than that for oxymorphone, consistent with reported in vitro receptor binding affinities for these compounds. Simulations show that AE incidence following administration of tapentadol IR is lower than that following oxycodone IR intake within the investigated range of analgesic noninferiority dose ratios.
Conclusions
This PK/PD analysis supports the clinical findings of reduced nausea, vomiting and constipation reported by patients treated with tapentadol, compared to patients treated with oxycodone.
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ACKNOWLEDGMENTS AND DISCLOSURES
All authors are employees of Janssen Research and Development. The analyses and studies described in this report were funded by Janssen Research and Development. Steven Xu is an adjunct assistant professor in the School of Public Health at the University of Medicine and Dentistry of New Jersey.
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Supplementary Figure 1A
Diagnostic Plots for the Final Joint PK Model for Oxycodone (A) and Oxymorphone (B). The dashed line represents a LOWESS smoother. In the residual plots, the ordinate value of zero is presented (solid horizontal line). In the plots of observed vs. population and individual predictions, the solid line represents the line of identity. (PPT 525 kb)
Supplementary Figure 1B
Diagnostic Plots for the Final Joint PK Model for Oxycodone (A) and Oxymorphone (B). The dashed line represents a LOWESS smoother. In the residual plots, the ordinate value of zero is presented (solid horizontal line). In the plots of observed vs. population and individual predictions, the solid line represents the line of identity. (PPT 442 kb)
Supplementary Figure 2
Distribution of estimated steady-state AUC for tapentadol (50, 75, and 100 mg), oxycodone, and oxymorphone. (PPT 124 kb)
Supplementary Figure 3
Comparison of predicted event-free probability based on the PK/PD models to the observed event-free probability over time (Kaplan-Meier [KM] curves according to tapentadol dose groups). The solid lines represent the observed KM curves; the shaded areas represent the 95% confidence intervals of model prediction, which were constructed using the uncertainty (standard error) for the model parameters. (PPT 151 kb)
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Xu, X.S., Etropolski, M., Upmalis, D. et al. Pharmacokinetic and Pharmacodynamic Modeling of Opioid-Induced Gastrointestinal Side Effects in Patients Receiving Tapentadol IR and Oxycodone IR. Pharm Res 29, 2555–2564 (2012). https://doi.org/10.1007/s11095-012-0786-5
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DOI: https://doi.org/10.1007/s11095-012-0786-5