The European hedgehog is a nocturnal native animal in Europe. Its natural habitats are the edges of woods and areas with sufficient undergrowth, but the hedgehog is also found in the gardens and parks of urban areas (Mariacher et al., 2021; Zoogdiervereniging, 2022). They are common in the Netherlands, but there are declines in hedgehog populations (Zoogdiervereniging, 2022). Huijser & Bergers estimated that a decline of 30% of local populations was due to road kills (Huijser & Bergers, 2000). Hedgehogs do not run off when they encounter approaching vehicles. Instead, they tend to roll up into a spiny ball when they feel threatened. Unfortunately, because of this behaviour, they are frequently subjects of traffic kills. When the animal survives, it might be taken to a wildlife rescue centre. Specialised hedgehog rescue centres are found throughout Europe (Mariacher et al., 2021; Egelopvang, 2022). Other hedgehogs taken to rescue centres are orphaned hoglets, sick and dehydrated hedgehogs and individuals subject to malnutrition. (Bunnell, 2001). In the hedgehog centres, the wounds and illnesses are treated, and the animals are checked for parasites. Hedgehogs considered fit to resume their lives in the wild are released, either in the area where they were found or in a "hedgehog-friendly" area. Wild hedgehogs are hosts to many parasites, both external and internal. External parasites are, e.g. fleas and ticks as well as fungi (Roundworm). Endoparasites are worms (Nematoda, Trematoda, Cestoda and Acanthocephala) and unicellular parasites (Protozoa) (Mariacher et al., 2021). Common endoparasitic worms are lungworm (Crenosoma striatum), lung threadworm (Capillaria aerophila) and intestinal threadworm species (Capillaria erinacei and C. ovoreticulata) (British Hedgehog Preservation Society, NY). As mentioned above, three Capillaria species can be found in hedgehogs. The hedgehog is infected through an intermediate host, the earthworm, that ingests Capillaria eggs. Hedgehogs feed on earthworms. The worm eggs develop in the hedgehog's intestines, where the larvae hatch. Lung threadworms will parasitise the lungs. Intestinal threadworms remain in the intestines (Lambert, 1995). Both worm larvae and eggs of all three Capillaria species can be found in faeces. (British Hedgehog Preservation Society, NY). Commonly applied anthelmintic drugs in hedgehogs are Fenbendazole and Levamisole. Levamisole is a very effective anthelmintic but might cause abortions in female hedgehogs (Lambert, 1995). For this reason, some hedgehog rescue centres in the Netherlands prefer Flubenol (Flubendazole) in female hedgehogs (Egelopvang Den Haag, oral comm. 2021). Flubenol, 5% powder, is an anthelmintic drug commonly used in pigs and poultry. (Zorginformatie voor iedereen, 2013). This study aimed to determine the effect of Flubenol in Capillaria spp. infections in female European hedgehogs.