Prescriptions for two antiparasitic drugs, ivermectin and fenbendazole, have recently surged in the US, according to a new study. Originally developed to treat parasitic worms, the drugs are now being discussed online as possible cancer treatments.

In January 2025, Mel Gibson appeared on the Joe Rogan Experience podcast claiming that ivermectin and fenbendazole can treat cancer. He said the drugs cured three friends of stage 4 cancer. Clips from the interview spread rapidly on social media.

For some listeners, the interview was probably convincing enough for them to try and obtain the drugs for themselves. Prescriptions for ivermectin more than doubled among cancer patients after the podcast appearance. Google searches increased sharply and online forums filled with discussions about self-dosing. Within days, the two drugs were being touted online as possible breakthrough cancer therapies.

But what does the scientific evidence actually show?

First, let’s consider ivermectin, a widely prescribed........

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