What Ivermectin Can (and Can’t) Do

At least once a week, someone asks Dr. Skyler Johnson if ivermectin can treat their cancer.

Patients have asked about the anti-parasitic drug for years, especially during the pandemic. But in recent months, Dr. Johnson, a radiation oncologist at the University of Utah Huntsman Cancer Institute, has fielded more and more questions about the medication.

Exaggerated and inaccurate comments about ivermectin have intensified online lately. Google searches for “ivermectin” hit their highest point in January since a Covid wave in 2022. That month, the actor Mel Gibson appeared on the hit podcast “The Joe Rogan Experience” and said that three friends with Stage 4 cancer recovered after taking ivermectin, among other drugs. Researchers said the podcast, which received 10 million views on YouTube alone, fed into a flood of inaccurate claims and misinformation about the drug’s purported health benefits.

At the same time, politicians in several states are promoting legislation that would make it easier for people to obtain ivermectin. The governor of Arkansas signed a bill last week that would enable people to buy it without a prescription. Lawmakers in Georgia, Texas, West Virginia, Alabama, Louisiana and Kentucky have filed, or said they plan to file, similar legislation.

A wealth of research has shown the drug does not treat Covid. And there is not evidence to support people taking ivermectin to treat cancer.

“I understand that people, a lot of times, want to take health into their own hands — they want to figure things out on their own,” said Krissy Lunz Trujillo, an assistant professor of political science at the University of South Carolina who researches health misinformation. “But that might have really serious consequences.”

Dr. Johnson worries that people will forgo traditional cancer treatments for a drug that hasn’t been proven to work. He tells patients that there is no rigorous research showing the anti-parasitic drug cures cancer in humans. Still, he has seen some people with early, treatable tumors turn to the drug, and return months later with cancers that have spread to their lymph nodes, bones and brain.