Contribution of oxycodone and its metabolites to the overall analgesic effect after oxycodone administration
Objective: Oxycodone (OC) is an opioid which exerts its analgesic effect through µ-receptors in the brain. It is metabolized through CYP450 enzymes and some of the metabolites show pharmacological activity. The aim of this investigation is to research the contribution of the metabolites of OC to its...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
14 Mar 2013
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| In: |
Expert opinion on drug metabolism & toxicology
Year: 2013, Volume: 9, Issue: 5, Pages: 517-528 |
| ISSN: | 1744-7607 |
| DOI: | 10.1517/17425255.2013.779669 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1517/17425255.2013.779669
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| Author Notes: | Romina Klimas, Diana Witticke, Sarah El Fallah & Gerd Mikus |
MARC
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| 520 | |a Objective: Oxycodone (OC) is an opioid which exerts its analgesic effect through µ-receptors in the brain. It is metabolized through CYP450 enzymes and some of the metabolites show pharmacological activity. The aim of this investigation is to research the contribution of the metabolites of OC to its overall analgesic effect. A further aim was to elucidate the role of drug-drug interactions and CYP2D6 polymorphism. Research design and methods: The authors performed a literature search to identify published information on: blood concentrations of OC and metabolites, protein binding, blood-brain-barrier behavior and opioid receptor affinity. The authors then calculated the contribution of OC and metabolites to the overall analgesic effect. Results: OC itself is responsible for 83.02 and 94.76% of the analgesic effect during p.o. and i.v. administration, respectively. Oxymorphone (OM), which has a much higher affinity for the µ-receptor, only plays a minor role (15.77 and 4.52% for p.o. and i.v., respectively). Although the CYP2D6 genotype modulates OM pharmacokinetics, OC remains the major contributor to the overall analgesic effect. Conclusion: This article's calculations demonstrate that OC itself is responsible for the analgesic effect. Although OM and noroxymorphone have much higher µ-receptor affinity than the parent drug, the metabolite concentrations at the site of action are very low. This suggests that there is a minimal analgesic effect from these metabolites. | ||
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