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Davidson RK, Fæste CK, Uhlig S, Tukun FL, Lian H, Solvang HA, Thorvaldsen R, Folkow LP, Sánchez Romano J, Kilvær MV, Holmgren KE, Nymo IH. Pharmacokinetics of a long-acting subcutaneous eprinomectin injection in semi-domesticated reindeer (Rangifer tarandus tarandus) - A pilot study. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 97:104041. [PMID: 36535586 DOI: 10.1016/j.etap.2022.104041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 12/08/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Reindeer (Rangifer tarandus tarandus) are exposed to the pathogenic parasitic nematode Elaphostrongylus rangiferi during grazing. The severity of disease is dose-dependent. Prophylactic anthelmintic treatment is needed to improve animal health and reindeer herding sustainability. Herds are traditionally only gathered once during the summer, requiring a drug with a persistent effect. In this study we investigated the suitability of long-acting eprinomectin, given as a single subcutaneous injection at 1 mg/kg bodyweight in adult reindeer and calves. Plasma and faeces concentrations were determined using ultra-high performance liquid chromatography high resolution mass spectrometry (UHPLC-HRMS). Plasma concentrations remained above the presumed effect level of 2 ng/mL for 80 days, demonstrating the drug's potential. Pharmacokinetic parameters were compared to other species using allometric scaling. Calves and adults had slightly different profiles. No viable faecal nematode eggs were detected during treatment. Eprinomectin was measurable in the reindeer faeces up to 100 days, which is of environmental concern.
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Affiliation(s)
- Rebecca K Davidson
- Norwegian Veterinary Institute, Food Safety and Animal Health Research Group, Holtvegen 66, 9016 Tromsø, Norway.
| | | | - Silvio Uhlig
- Norwegian Veterinary Institute, Toxinology Research Group, Ås, Norway
| | - Feng-Ling Tukun
- Norwegian Veterinary Institute, Toxinology Research Group, Ås, Norway
| | - Hans Lian
- UiT The Arctic University of Norway, Department of Arctic and Marine Biology, Tromsø, Norway
| | - Hans Arne Solvang
- UiT The Arctic University of Norway, Department of Arctic and Marine Biology, Tromsø, Norway
| | - Renate Thorvaldsen
- UiT The Arctic University of Norway, Department of Arctic and Marine Biology, Tromsø, Norway
| | - Lars P Folkow
- UiT The Arctic University of Norway, Department of Arctic and Marine Biology, Tromsø, Norway
| | | | | | - Karin Elisabeth Holmgren
- Norwegian Veterinary Institute, Food Safety and Animal Health Research Group, Holtvegen 66, 9016 Tromsø, Norway
| | - Ingebjørg Helena Nymo
- Norwegian Veterinary Institute, Food Safety and Animal Health Research Group, Holtvegen 66, 9016 Tromsø, Norway; UiT The Arctic University of Norway, Department of Arctic and Marine Biology, Tromsø, Norway
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Gang Q, Yapei R. Preparation of Eprinomectin Nanoemulsions and Determination of Their Pharmacokinetics and Pharmacodynamics in Dairy Cows. J Biomed Nanotechnol 2022; 18:512-526. [PMID: 35484758 DOI: 10.1166/jbn.2022.3268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study aimed to develop an anthelmintic that leaves no residues and is safe and efficient for use in cows. We constructed classical pseudoternary phase diagrams using experimental animal data to optimize and characterize the eprinomectin nanoemulsion formulas. The emulsion samples prepared with ethyl acetate, polysorbate 80, and 1-propanediol as the main components were transparent and uniform when observed under a Hitachi transmission electron microscope (TEM) system. A Mastersizer 3000 laser particle size analyzer was used to determine the particle sizes of the prepared nanoemulsions. The nanoemulsions were homogeneously dispersed, with an average particle size of 12.61 nm and a polydispersity index of (PDI) 0.297. High-performance liquid chromatography confirmed no statistically significant changes in the samples after 24 months at 4 °C, 25 °C, and 37 °C; the samples exhibited long-term stability. The PK/PD studies confirmed that the injection of eprinomectin nanoemulsions at a dose of 0.2 mg/kg body weight was effective, with a withdrawal period of 0 days for dairy cows. The total extermination rate of the nanoemulsions against adult nematodes was 98.40±1.52%. The AUCmilk/plasma ratio was 0.67±0.03. The optimal dose was found to be 0.2 mg/kg body weight.
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Affiliation(s)
- Qiu Gang
- College of Animal Science and Veterinary Medicine, Xinyang Agriculture and Forestry University, Xinyang, 464000, PR China
| | - Rui Yapei
- College of Animal Science and Veterinary Medicine, Xinyang Agriculture and Forestry University, Xinyang, 464000, PR China
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