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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. Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.


Rebecca K Davidson, Christiane Kruse Fæste, Silvio Uhlig, Feng-Ling Tukun, Hans Lian, Hans Arne Solvang, Renate Thorvaldsen, Lars P Folkow, Javier Sánchez Romano, Marianne Vinje Kilvær, Karin Elisabeth Holmgren, Ingebjørg Helena Nymo. Pharmacokinetics of a long-acting subcutaneous eprinomectin injection in semi-domesticated reindeer (Rangifer tarandus tarandus) - A pilot study. Environmental toxicology and pharmacology. 2023 Jan;97:104041

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PMID: 36535586

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