Fenbendazole, ivermectin and other internet 'repurposed cures'
Dog dewormers and anti-parasite drugs are promoted on social media as hidden cancer cures on the strength of cell-culture experiments and anecdotes. No clinical trial shows benefit in people, liver damage has been reported, and drug repurposing is real but works through trials, not forums.
Overview
Fenbendazole (a veterinary benzimidazole) and ivermectin inhibit microtubules or other pathways in cancer cell lines and animal models, as do many compounds that never become drugs. A widely shared 2016 personal story of a lung cancer patient who took fenbendazole alongside a clinical trial drug and immunotherapy drove global demand, and ivermectin claims followed the pandemic. There are no completed clinical trials of either in cancer showing benefit; case reports describe severe liver injury with fenbendazole, and interactions with chemotherapy are unstudied. Legitimate repurposing candidates with some clinical evidence (aspirin, metformin, statins, propranolol, mebendazole in early trials for glioma) go through registered trials and are discussed in the corpus separately. The MSK About Herbs database and cancer charities publish plain-language rebuttals; the underlying problem, that cheap generics attract no sponsor, is a real bottleneck.
How it works
Microtubule disruption and other in-vitro effects at concentrations far above those achieved by veterinary or antiparasitic dosing in humans.
- Illustrates the need for public repurposing trials
- Rebuttals are readily available
- No clinical efficacy data
- Hepatotoxicity reports
- Encourages abandoning proven treatment
Latest papers
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