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The current antiparasitic treatment for alveolar echinococcosis relies exclusively on albendazole, which does not act parasiticidally and can induce severe adverse effects. Alternative, and most importantly, improved treatment options are urgently required. A drug repurposing strategy identified the approved antimalarial pyronaridine as a promising candidate against <jats:italic>Echinococcus multilocularis<\/jats:italic> infections. Following a 30-day oral regimen (80 mg kg<jats:sup>\u22121<\/jats:sup> day<jats:sup>\u22121<\/jats:sup>), pyronaridine achieved an excellent therapeutic outcome in a clinically relevant hepatic alveolar echinococcosis murine model, showing a significant reduction in both metacestode size (72.0%) and counts (85.2%) compared to unmedicated infected mice, which revealed significantly more potent anti-echinococcal potency than albendazole treatment at an equal dose (metacestode size: 42.3%; counts: 4.1%). The strong parasiticidal activity of pyronaridine was further confirmed by the destructive damage to metacestode tissues observed morphologically. In addition, a screening campaign combined with computational similarity searching against an approved drug library led to the identification of pirenzepine, a gastric acid-inhibiting drug, exhibiting potent parasiticidal activity against protoscoleces and <jats:italic>in vitro<\/jats:italic> cultured small cysts, which warranted further <jats:italic>in vivo<\/jats:italic> investigation as a promising anti-echinococcal lead compound. Pyronaridine has a known drug profile and a long track record of safety, and its repurposing could translate rapidly to clinical use for human patients with alveolar echinococcosis as an alternative or salvage treatment.<\/jats:p>","DOI":"10.1017\/s0031182024001124","type":"journal-article","created":{"date-parts":[[2024,11,7]],"date-time":"2024-11-07T10:16:06Z","timestamp":1730974566000},"page":"1441-1448","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":4,"title":["Drug repurposing for hard-to-treat human alveolar echinococcosis: pyronaridine and 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