How Ivermectin Became Right-Wing Aspirin

Remember ivermectin? The animal-deworming medication was used so avidly as an off-label COVID treatment during the pandemic that some feed stores ended up going out of stock. (MUST SHOW A PIC OF YOU AND YOUR HORSE, a sign at one demanded of would-be customers in 2021.) If you haven’t heard about it since, then you’ve existed blissfully outside the gyre of misinformation and conspiracies that have come to define the MAGA world’s outlook on medicine. In the past few years, ivermectin’s popularity has only grown, and the drug has become a go-to treatment for almost any ailment whatsoever. Once a suspect COVID cure, now a right-wing aspirin.

In fact, ivermectin never really worked for treating SARS-CoV-2 infections. Many of the initial studies that hinted at a benefit turned out to be flawed and unreliable. By 2023, a series of clinical trials had already proved beyond a doubt that ivermectin won’t reduce COVID symptoms or mortality. But these findings mattered little to its fans, who saw the drug as having earned the status of dissident antiviral—a treatment that they believed had been suppressed by the medical establishment. And if ivermectin was good enough to be rejected by mainstream doctors as a cure for COVID, health-care skeptics seemed to reason, then surely it must have a host of other uses too.

As a physician who diagnoses cancer, I have come across this line of thinking in my patients, and found that some were using ivermectin to treat their life-threatening tumors. Nicholas Hornstein, a medical oncologist in New York City, told me that he’s had the same experience: About one in 20 of his patients ask about the drug, he said. He remembers one woman who came into his office with a tumor that was visibly protruding from her abdomen, having swapped her chemotherapy for some ivermectin that she’d picked up at a veterinary-supply store. “It’s going to work any day now,” he says she told him when he tried to intervene.

The idea that ivermectin could be a cancer-fighting agent does have some modest basis in reality: Preliminary studies have suggested that antiparasitic medications might inhibit tumor growth, and at least one ongoing clinical trial is evaluating ivermectin’s role as an adjunct to cancer treatment. That study has enrolled only nine patients, however, and the results so far show that just one patient’s tumor actually shrank, according to a recent scientific abstract. But these meager grounds for hope now support a towering pile of expectations.

https://www.theatlantic.com/health/archive/2025/06/ivermectin-miracle-drug-right-wing-aspirin/683197/