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FalseScienceLast updated: July 10, 2026

Ivermectin Is a 'Near-Perfect' COVID Prophylactic

Bret Weinstein, an evolutionary biologist and podcaster, called ivermectin a 'near-perfect COVID prophylactic' and claimed that its suppression was the result of institutional corruption. BBC fact-checks and reviews of high-quality studies showed that ivermectin demonstrates no effectiveness against COVID-19 in rigorous trials.

Written by Iggy Pomp · Reviewed by Igor Pomper · Last updated July 10, 2026

What we know

Evolutionary biologist Bret Weinstein promoted ivermectin as an effective COVID-19 treatment on his podcast and in public appearances starting in 2021, describing it as a suppressed cure and criticizing regulatory agencies for not endorsing it. Ivermectin is a genuine, well-established antiparasitic drug used safely for decades against conditions like river blindness and scabies, which gave the claim an initial appearance of plausibility, but that established safety record for parasitic disease does not extend to any proven benefit against a viral respiratory infection.

The evidence base on ivermectin for COVID-19 is unusually large and unusually clear. The TOGETHER trial, a large randomized controlled trial conducted in Brazil and published in the New England Journal of Medicine in 2022, found no significant difference in hospitalization or death between patients given ivermectin and those given a placebo. The ACTIV-6 trial, a U.S. National Institutes of Health-funded study published in JAMA in 2022, tested ivermectin in over 1,500 outpatients with mild to moderate COVID-19 and found no meaningful improvement in time to recovery. A Cochrane systematic review, the type of evidence considered the gold standard for clinical decision-making, concluded in its most recent update that ivermectin has no meaningful effect on mortality, clinical worsening, or viral clearance in COVID-19 patients, based on pooling multiple randomized trials.

Part of the ivermectin narrative's persistence traces to a since-retracted 2021 study from Egypt that reported a large mortality benefit; the paper was withdrawn by its preprint server after independent researchers identified evidence of data fabrication, including duplicated patient records. That single flawed study disproportionately influenced early meta-analyses that appeared to show a benefit, an effect that disappeared once the fraudulent data was removed. Weinstein and other promoters continued citing early, since-superseded analyses even after the retraction and after larger, better-designed trials produced negative results.

Weinstein also amplified claims that ivermectin was being suppressed by pharmaceutical companies and regulators to protect vaccine profits, a claim that does not fit the documented facts: ivermectin is an inexpensive, off-patent generic drug that would have generated minimal profit for any manufacturer regardless of the outcome of the studies, removing the usual financial motive cited in suppression narratives. The FDA and WHO both issued explicit public warnings against using ivermectin for COVID-19 outside of clinical trials, not to protect vaccine sales but in response to a documented spike in poisoning cases from people taking veterinary formulations intended for livestock.

The scientific and regulatory consensus, reflected in guidance from the WHO, the U.S. National Institutes of Health, and the FDA, is that ivermectin is not recommended for COVID-19 treatment outside of a research setting because the totality of high-quality trial evidence shows no meaningful clinical benefit. This does not mean ivermectin is inherently dangerous when used correctly for its approved parasitic indications; it means the specific claim that it cures or effectively treats COVID-19 is not supported by the clinical trial record.

Weinstein's promotion of ivermectin is part of a broader pattern in his public commentary of positioning himself as a credentialed scientist willing to say what institutions supposedly will not, a framing that treats institutional caution as evidence of cover-up rather than a normal response to inconclusive or negative trial data. The scale of research devoted to ivermectin for COVID-19 is itself notable: dozens of randomized controlled trials involving tens of thousands of participants across multiple countries were conducted specifically because early observational signals warranted serious investigation, and that investigation was allowed to run its course through normal scientific channels rather than being suppressed. The consistent negative result across large, well-designed trials is what ended mainstream medical interest in the drug for this indication, not institutional resistance to testing it in the first place.

Common claims

  • Ivermectin is a near-perfect COVID prophylactic.False - rigorous studies do not confirm its effectiveness
  • Institutions are deliberately suppressing information about ivermectin.Not supported - an interpretation built on a chain of assumptions
  • HIV is not the cause of AIDS; party drugs are.False - debunked since 1988
  • Weinstein is a relevant expert for evaluating COVID treatments.Misleading - his specialism is evolutionary biology, not epidemiology or virology

Evidence hierarchy

01BBC Reality Check: No evidence for ivermectin in rigorous studiesMany pro-ivermectin studies had manipulated data; rigorous studies show no effectiveness against COVID.02Vice: Weinstein promotes AIDS denialism to millionsWeinstein repeated the Duesberg hypothesis - debunked since 1988 - to millions of listeners.03Decoding the Gurus: Weinstein ivermectin episode analysisAcademic podcast analysing Weinstein's methodology documents multiple unsupported claims.

All sources

Related terms

Joe Rogan Is DangerousCOVID Vaccines Cause More Harm Than GoodRobert Malone Invented mRNA VaccinesCOVID-19 Is a Bioweapon Designed to Spare Jewish and Chinese People