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A Large Impact of Obesity on the Disposition of Ivermectin, Moxidectin and Eprinomectin in a Canine Model: Relevance for COVID-19 Patients
Bousquet-Mélou et al., Frontiers in Pharmacology, doi:10.3389/fphar.2021.666348 (date from earlier preprint)
Bousquet-Mélou et al., A Large Impact of Obesity on the Disposition of Ivermectin, Moxidectin and Eprinomectin in a Canine Model:.., Frontiers in Pharmacology, doi:10.3389/fphar.2021.666348 (date from earlier preprint)
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Animal dosing study with an obese dog model concluding that ivermectin maintenance doses should be based on lean body weight and not the total body weight in obese subjects, while the loading dose should be based on the total body weight.
Bousquet-Mélou et al., 11 Jan 2021, peer-reviewed, 5 authors.
Contact: pltoutain@wanadoo.fr.
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Abstract: Title: Large Impact of obesity on the disposition of ivermectin, moxidectin and eprinomectin in a canine model: relevance for COVID-19 patients. Short running title: obesity and pharmacokinetics of ivermectin, moxidectin and eprinomectin Authors: A. Bousquet-Mélou1, A Lespine1, J-F Sutra1, I Bargues1, P-L. Toutain1,3 1 INTHERES, Université de Toulouse, INRAE, ENVT, Toulouse, France. 3 The Royal Veterinary College, Hawkshead Campus, Hatfield, Herts., AL9 7TA, United Kingdom Orcid numbers Bousquet-Melou: https://orcid.org/0000-0002-7661-4311 P-L Toutain: http://orcid.org/0000-0002-8846-8892 *Corresponding author: Pierre-Louis Toutain* E-mail to : pltoutain@wanadoo.fr Fax: +33 561 19 39 17 Word count: 3880 Bullet point summary: ‘What is already known’,  The parasicicide Ivermectin is currently being evaluated for the prevention and treatment of COVID-19, a condition for which obesity is a major risk factor.  Dosages of ivermectin and moxidectin, an analog of ivermectin, are based on total body weight and there are no recommendations to adjust dosage in obese patients. 1 ‘What this study adds’  Using a canine model of obesity, it was shown that the absolute value (expressed in L/day) of plasma clearance is unchanged for moxidectin and reduced for ivermectin in obesity compared to control conditions, whilst steady-state volumes of distribution (expressed in L) were increased. ‘Clinical significance’,  It is suggested that maintenance doses of ivermectin and moxidectin that are controlled by clearance must be based on lean body weight (individual flat dose) while the loading doses that are controlled by the volume of distribution should be based on actual total body weight. Abstract: Background and Purpose: Based on in vitro data, ivermectin (IVM) has been proposed for the prevention and treatment of COVID-19, a condition for which obesity is a major risk factor. IVM dosage is based on total body weight and there are no recommendations to adjust dosage in obese patients. The objective of this study was to establish, in a canine model, the influence of obesity on the clearance and steady-state volume of distribution of IVM and two analog compounds, moxidectin (MOX) and eprinomectin (EPR). Experimental Approach: An experimental model of obesity in dogs was based on a high calorie diet. IVM, MOX and EPR were administered intravenously, simultaneously in combination, to a single group of dogs in two circumstances, during a control period and when body weight had been increased by 50%. Key Results: In obese dogs, clearance, expressed in absolute values (L/day), was not modified for MOX and reduced for IVM and EPR, compared to the initial control state. When scaled by body weight (L/day/kg), plasma clearance was reduced by 42, 55 and 2 63%, for MOX, IVM and EPR, respectively. In contrast, the steady-state volume of distribution was markedly increased in absolute values (L) by obesity. Conclusion and Implications: For IVM and MOX, the obese dog model suggests that the maintenance dose should not be adjusted by total body weight in the obese subject but should be based on lean body weight. On the other hand, the loading dose should be computed based on the total body weight of the obese subject. Abbreviations CL: Clearance Cld: Clearance of distribution EPR: Eprinomectin IVM : Ivermectin LBW: Lean Body Weight MOX: Moxidectin MRT: Mean Residence Time Total Body Weight: TBW Vc: Volume of the central compartment V2 & V3: Volume of..
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