How a Podcast Spurred a 40% Jump in Antiparasitic Drug Use

By VirentaNews Staff — May 19, 2026

On a crisp autumn morning in a suburban oncology clinic, a 58-year-old woman sat across from her physician, not with questions about chemotherapy side effects or survival rates, but with a printed transcript of a Joe Rogan podcast episode. She wanted a prescription for fenbendazole—an antiparasitic drug used in veterinary medicine—and was convinced it could help shrink her lung tumor. She wasn’t alone. Across the country, doctors began noticing a quiet but unmistakable shift: cancer patients, many previously adherent to evidence-based treatment, were requesting antiparasitic drugs based not on clinical trials, but on a 90-minute conversation between an actor and a comedian. The phenomenon, once anecdotal, now has data behind it—a study published in Nature Medicine shows a 40% spike in prescriptions for ivermectin and fenbendazole among cancer patients in the three months following Mel Gibson’s controversial appearance on The Joe Rogan Experience.

Prescription Trends Defy Clinical Guidelines

Between September and December 2023, prescriptions for ivermectin and fenbendazole among U.S. cancer patients rose sharply, increasing by 41% and 38% respectively, according to the analysis of anonymized insurance claims from over 1.2 million patients. The study, conducted by researchers at the University of California, San Francisco, found no corresponding rise in prescriptions for these drugs among non-cancer patients, suggesting the surge was specifically tied to their use as alternative cancer therapies. Fenbendazole, which is approved for use in dogs and horses to treat worms, has no FDA approval for human use, let alone cancer treatment. Ivermectin, while approved for certain parasitic infections in humans, has repeatedly been dismissed by health authorities as ineffective against cancer. Despite this, the data shows a clear inflection point: the week following Gibson’s October 12 podcast episode, requests for these drugs in oncology clinics increased by 62% compared to the prior month.

The Road to Rogue Remedies

The idea that antiparasitic drugs could treat cancer is not new, but it has long resided on the fringes of medical science. In the early 2000s, a few lab studies suggested fenbendazole might inhibit microtubule formation in cancer cells—a mechanism shared by some chemotherapy drugs. However, these findings were never replicated in human trials. The theory gained traction online through YouTube channels and wellness blogs, where anecdotal stories of remission were amplified without scrutiny. The turning point came in 2020, during the pandemic, when ivermectin was falsely promoted as a COVID-19 cure, leading to shortages and emergency warnings from the FDA. Now, that same misinformation ecosystem has pivoted to cancer. Gibson’s endorsement—delivered with the gravitas of a Hollywood veteran—lent credibility to what had been dismissed as fringe theory. The podcast episode, viewed over 15 million times, featured Gibson describing how he used fenbendazole and ivermectin as part of a ‘natural protocol’ during his own cancer journey, despite offering no medical documentation.

The Faces Behind the Trend

Mel Gibson’s personal appeal lies at the heart of this surge. As an Oscar-winning director and star of action films, he commands an audience that spans demographics and political affiliations. When he spoke candidly about surviving cancer using unconventional methods, many listeners interpreted it as a revelation, not a risky anecdote. Joe Rogan, whose podcast regularly features scientists and skeptics alongside controversial figures, did not challenge Gibson’s claims during the episode, a decision critics say amplified misinformation. Meanwhile, oncologists across the country report feeling caught between patient autonomy and medical ethics. Dr. Lena Torres, an oncologist at Massachusetts General Hospital, described the situation as ‘a crisis of trust.’ ‘Patients come in believing they’ve discovered something medicine is hiding,’ she said in an interview with Reuters. ‘It’s not just about one drug—it’s about a growing skepticism toward institutions that have saved millions of lives.’

Risks and Repercussions

The consequences of this trend extend beyond wasted money or false hope. Fenbendazole can cause liver toxicity and interact dangerously with chemotherapy agents. Ivermectin, when taken in high doses, can lead to neurological side effects including seizures and coma. More insidiously, patients who delay or abandon proven treatments in favor of unproven regimens face significantly worse outcomes. The study found that 22% of patients who started fenbendazole discontinued standard therapy within six weeks. Public health experts warn that the normalization of veterinary drugs in human medicine erodes regulatory safeguards. ‘This isn’t about freedom of choice,’ said Dr. Raj Mehta, a pharmacologist at Johns Hopkins. ‘It’s about whether we allow anecdotes to override decades of clinical research.’ The FDA has yet to issue a formal warning specific to fenbendazole use in cancer, though it reiterated its stance that ‘no antiparasitic drug is approved for cancer treatment in humans.’

The Bigger Picture

This episode underscores a broader crisis in science communication: when celebrities with large platforms share personal health experiences as universal truths, the line between storytelling and medical advice blurs. The internet rewards virality, not validity, and algorithms amplify emotional narratives over dry, evidence-based facts. The result is a public increasingly mistrustful of medical institutions and vulnerable to pseudoscientific claims. As long as unverified treatments gain traction through cultural influence rather than clinical proof, the medical community will face an uphill battle to protect patients from harm. The real cost isn’t just in prescriptions—it’s in lives potentially shortened by preventable detours.

What comes next may depend on how swiftly the scientific and media communities respond. Some experts advocate for preemptive myth-busting by trusted voices in real time, while others call for podcast platforms to include content warnings for medical claims. The data is clear: a single conversation can alter medical behavior at scale. The challenge now is to ensure that the most influential voices are also the most responsible ones.

Source: Cidrap