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The effect of intravenous lipid emulsion (ILE) on the pharmacokinetic/toxicokinetic dispositions of ivermectin and carprofen in rabbits

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Abstract

Intravenous lipid emulsion (ILE) has been widely used as an effective antidote in both veterinary and human medicine for the treatment of acute intoxications caused by drugs and pesticides with high lipid solubility. This study was conducted to investigate the effect of ILE co-administration on the kinetic dispositions of ivermectin (IVM) and carprofen (CRP) following intravenous bolus administration at subtoxic doses in rabbits.

Twenty-four male New Zealand rabbits weighing 2.78 ± 0.2 kg were used in this study. Rabbits were divided into four groups (Group 1: IVM and Group 2: IVM + ILE or Group 3: CRP and Group 4: CRP + ILE), each group consisting of 6 animals. In the IVM study, Group 1 received IVM (0.6 mg/kg) alone while Group 2 received IVM (0.6 mg/kg) and ILE (2.5 ml/kg). In the CRP study, Group 3 received CRP (12 mg/kg) alone while Group 4 received CRP (12 mg/kg) and ILE (2.5 ml/kg). In both drug groups, ILE was administered 3 times as an i.v. bolus at the 10th min and repeated 4th and 8th h after the drug administration. Blood samples were collected from the auricular vein at various times after drug administration. The drug concentrations in plasma samples were determined by high-pressure liquid chromatography. Kinetic parameters were calculated using a non-compartmental model for both CRP and IVM.

The C0 and area under the concentration–time curve from zero up to ∞ (AUC0–∞) values were significantly greater with ILE co-administration (2136 ng/ml and 360.84 ng.d/ml) compared to the IVM alone (1340.63 ng/ml and 206 ng.d/ml), respectively. Moreover, the volume of distribution (Vdss) and clearance (Cl) of IVM were reduced by approximately 42% and 46% with ILE co-administration compared to IVM alone resulting in a reduction of the distribution and slower elimination, respectively. Similar differences in C0, and Vdss values were also observed in CRP with ILE co-administration compared to CRP alone. ILE co-administration changed significantly the kinetic profile of both IVM and CRP in rabbits, supporting the lipid sink theory in which highly lipid-soluble compounds are absorbed into the lipid phase of plasma from peripheral organs such as the heart and brain affected by the acute toxicity of the compounds.

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The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request.

This paper was summarized from the PhD thesis dissertation of Mrs. Busra Aslan Akyol at Balikesir University.

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Acknowledgements

The authors acknowledge with pleasure the technical assistance of Asst. Prof. Dr. Eyup Tolga Akyol, Dr. Fazilet Sen and Dr. Nurullah Guclu in the animal experiment phase of the study.

Funding

This study was supported by the Scientific Research Committee of Balikesir University (Balikesir, Turkey) as a research project (project no: 2021/009).

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C.G. supervised and designed the experiments; C.G. and B.A.A. performed the experiment, analysed the results and drafted the manuscript; C.G. and B.A.A. wrote the main manuscript text and C.G. prepared figures 1-3. All authors reviewed the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.

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Correspondence to Cengiz Gokbulut.

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Approval was granted by the Animal Experiments Local Ethics Committee of Balikesir University (2021/2–2).

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The authors declare no competing interests.

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Akyol, B.A., Gokbulut, C. The effect of intravenous lipid emulsion (ILE) on the pharmacokinetic/toxicokinetic dispositions of ivermectin and carprofen in rabbits. Naunyn-Schmiedeberg's Arch Pharmacol 397, 1841–1852 (2024). https://doi.org/10.1007/s00210-023-02738-5

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  • DOI: https://doi.org/10.1007/s00210-023-02738-5

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