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Debates · Vaccine safety and mandates

Is ivermectin a safe and effective treatment or prophylaxis for COVID-19, warranting widespread clinical use?

3 shows · 5 speakers · published Nov 5, 2026 · updated Nov 9, 2026

The debate

The dispute is whether ivermectin is safe and effective enough against COVID-19 to justify widespread treatment or prevention use. Weinstein (DarkHorse Podcast) and McCullough (The Joe Rogan Experience) argue it is very safe and beneficial, while Zukerman (Science Vs) argues data show little or no benefit. These arguments have appeared on their podcasts since late 2025.

Where each side stands

Ivermectin is very safe and offers significant COVID-19 benefits that justify widespread use.

Bret Weinstein (DarkHorse Podcast) · Dr. Peter McCullough (The Joe Rogan Experience) · Joe Rogan (The Joe Rogan Experience) · Heather Heying (DarkHorse Podcast)

McCullough (The Joe Rogan Experience) cites over 160 ivermectin court cases where all 62 treated hospitalized patients lived and over 100 similar patients who did not receive it died. McCullough says the ICON study from Florida showed more than a fifty percent mortality reduction in hospitalized COVID-19 patients who received ivermectin. Weinstein (DarkHorse Podcast) describes ivermectin as so safe that he considers it almost impossible to take enough to cause serious harm. Weinstein argues its broad activity against single-stranded RNA viruses, including COVID, could reduce viral spread enough to push R0 below 1 and end the pandemic.

20 claims, in their words
  • “you are going to deny people Comparatively safe medications that address the disease very well and force them into an untested gene therapy that you know isn't effective and is very dangerous.”
    Bret Weinstein · DarkHorse Podcast · 2026-07-29 · 48:33 nothing cited
  • “They did, and they pretended not to remember what R0, means in the epidem, epidemiological work. The fact that, hydroxychloroquine and ivermectin could be used to bring the R naught below one, which meant that they actually could end the pandemic in their own, right, because when R naught is less than one, the infection goes extinct of its own”
    Bret Weinstein · DarkHorse Podcast · 2026-10-04 · 1:18:45 nothing cited
  • “hydroxychloroquine was perfectly safe during pregnancy we there's actually been randomized trials of using that in lupus I've used hydroxy in pregnant women ivermectin turned out to be safe we had monoclonal antibodies bamalivimab safe during pregnancy steroids”
    Dr. Peter McCullough · The Joe Rogan Experience · 2026-11-04 · 59:17 personal experience
  • “doctors were getting in trouble and losing their licenses for providing patients with medication that had not just efficacy, but there was, there was real studies that showed that, especially Uttar Pradesh in India, there's studies that showed that people that use these medications were more protected and were safer.”
    Joe Rogan · The Joe Rogan Experience · 2026-11-04 · 06:46 cites a studyUttar Pradesh in India studies
  • “I would have to unsee the hundreds of patients that I saw over the past year. So that would be the short answer to your question. So I'd have to pretend that I didn't treat them. The studies are overwhelming.”
    unidentified speaker · Science Vs · 2025-11-27 · 18:02 personal experience
  • “that I'm someone who's lost in conspiracy theory, and that's fine. You, you're thinking that this is all a mass delusion, that everyone's a little enthusiastic, and they decide to study it, and their biases led to some false conclusion that it worked. And that's a really cute story, but it's just not true.”
    unidentified speaker · Science Vs · 2025-11-27 · 20:08 nothing cited
  • “the Cochrane Institute in the UK is like, you know, the holy grail for analysis of drugs, and biologics, and, this process of meta-analysis. They kinda, they kinda wrote the rules for how to do it. And they had done an analysis that showed that ivermectin was quite effective.”
    unidentified speaker · The Joe Rogan Experience · 2026-02-13 · 1:11:06 cites a studyCochrane Institute meta-analysis
  • “Even still, if you go to the papers in which they showed that ivermectin was ineffective against COVID, these RCTs that we treat with religious reverence for no good reason. The papers actually say that even when you set up a study to fail, ivermectin is so effective that it still works. You have to look at the data. You”
    Bret Weinstein · DarkHorse Podcast · 2026-07-12 · 1:05:48 nothing cited
  • “Of 62 cases where he got the court order and they actually got the ivermectin into the patient, they lived. Of the over a hundred, hundred cases where they didn't get the court order or they got the court order and they still blocked the ivermectin, they all died.”
    Dr. Peter McCullough · The Joe Rogan Experience · 2026-11-04 · 1:20:07 cites a number62 cases lived, over 100 cases died
  • “And there was a group that got ivermectin in the and continued during the hospitalization, and a group who didn't. So it's a very good, and it was a randomized trial, but it's very good, you know, it, heat of the pandemic here in Florida, lots of senior citizens getting sick. Ivermectin has over a fifty percent reduction in mortality.”
    Dr. Peter McCullough · The Joe Rogan Experience · 2026-11-04 · 1:12:29 cites a studyICON study by Roshter from Florida
  • “I remember when we got to the story of ivermectin. I remember literally saying, what the fuck is this? Why would, why would we not be using a drug that has as much promise as this does in this case?”
    Bret Weinstein · DarkHorse Podcast · 2025-11-12 · 42:26 nothing cited
  • “If you allow people to use ivermectin, they will discover how effective it is against COVID. Why? Because like hydroxychloroquine, it is actually generally useful over RNA viruses.”
    Bret Weinstein · DarkHorse Podcast · 2026-02-18 · 1:25:52 nothing cited
  • “with a drug this safe, and it is as safe as any drug out there, the, you know, was it given to the people on the ship? It would be an obvious thing to do.”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · 32:55 nothing cited
  • “It doesn't just work on RNA viruses. It also works on helmets. It all, like, it works on so many things. And the idea that what you need, even though we've previously put this as one of our top medicines to use, if, you know, To use, both because it tends to be safe and it tends to be effective”
    Heather Heying · DarkHorse Podcast · 2026-05-09 · 32:12 nothing cited
  • “we have a drug that was discovered due to its antiparasitic value that turns out to have broad-scale antiviral effectiveness, works against Most, if not all, single-stranded RNA viruses by a host of different mechanisms and is so safe that if there's a chance that you're infected with a single-stranded RNA virus, it's a good bet that it would reduce”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · 1:12:54 cites a studyThe Mechanisms of Action of Ivermectin Against SARS-CoV-2, an Extensive Review
  • “one of the mechanisms of action of ivermectin is likely reduced, though not eliminated. There is still apparently coordination between the cytoplasmic activity and the, there's communication with the nucleus. So even that mechanism is likely still in play.”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · 1:11:12 nothing cited
  • “one of the things that unfolded in discussion about, hey, it's a single-stranded RNA virus, ivermectin is probably pretty useful, is there was a lot of pushback. There was the usual stuff about there's no evidence that, which is meaningless, especially the real problem for them with ivermectin is that it's so safe that the argument against giving it to”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · 1:10:03 nothing cited
  • “Why are we going to be facing RNA viruses? Why are we going to say, hey, ivermectin might work on that because it seems to work on all the others, and why is officialdom going to come back and tell us, no, you can't, it's dangerous, it's, there's no evidence, we have a randomized controlled trial that this, that, the”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · 33:42 nothing cited
  • “people are still confused about, about ivermectin, a drug which, for reasons I'm unclear on, is So safe that it is almost impossible to take enough of it to do significant damage to yourself.”
    Bret Weinstein · DarkHorse Podcast · 2026-07-12 · 1:03:53 nothing cited
  • “It's won a Nobel Prize for use in humans.”
    Bret Weinstein · DarkHorse Podcast · 2026-07-12 · 1:04:13 cites an event

Ivermectin is not proven safe and effective enough against COVID-19 to justify widespread clinical use.

Wendy Zukerman (Science Vs)

Zukerman (Science Vs) says that later large ivermectin trials with thousands of participants found no meaningful benefit against COVID-19. Zukerman states that if ivermectin were dramatically helping very sick COVID-19 patients, this would clearly appear in outcome data, but it does not. She concludes that, based on this evidence, ivermectin is not a blockbuster COVID-19 treatment saving large numbers of severely ill people.

2 claims, in their words
  • “when we got better studies later on with thousands of people, we found out that ivermectin did not work for COVID.”
    Wendy Zukerman · Science Vs · 2025-11-27 · 17:27 cites a number
  • “Whatever is going on with ivermectin, it's not saving bucket loads of really sick people. If it was, we'd see it clearly in the data, and we don't. ... the best data we have tells us that ivermectin really isn't doing much here.”
    Wendy Zukerman · Science Vs · 2025-11-27 · 20:43 nothing cited
What each side never hears

Listeners of “Ivermectin is not proven safe and effective enough against COVID-19 to justify widespread clinical use.” have not heard (14 arguments)

Listeners of these shows have not heard Weinstein's claim that hydroxychloroquine and ivermectin could lower COVID-19's R0 below 1 and by themselves end the pandemic. They have not heard McCullough's assertion that ivermectin was safe for pregnant COVID-19 patients alongside drugs like hydroxychloroquine and monoclonal antibodies. They have not heard Heying's point that ivermectin is on the WHO list of essential medicines and is used across many conditions, including some RNA virus infections. They have not heard Weinstein describe ivermectin as extremely safe and broadly active against single-stranded RNA viruses through multiple mechanisms, supported by a review on mechanisms against SARS-CoV-2.

14 unanswered arguments, in their words
  • “you are going to deny people Comparatively safe medications that address the disease very well and force them into an untested gene therapy that you know isn't effective and is very dangerous.”
    Bret Weinstein · DarkHorse Podcast · 2026-07-29 · unanswered for 14 weeks
  • “one of the mechanisms of action of ivermectin is likely reduced, though not eliminated. There is still apparently coordination between the cytoplasmic activity and the, there's communication with the nucleus. So even that mechanism is likely still in play.”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · unanswered for 26 weeks
  • “hydroxychloroquine was perfectly safe during pregnancy we there's actually been randomized trials of using that in lupus I've used hydroxy in pregnant women ivermectin turned out to be safe we had monoclonal antibodies bamalivimab safe during pregnancy steroids”
    Dr. Peter McCullough · The Joe Rogan Experience · 2026-11-04 · I've used hydroxy in pregnant womenthis week
  • “doctors were getting in trouble and losing their licenses for providing patients with medication that had not just efficacy, but there was, there was real studies that showed that, especially Uttar Pradesh in India, there's studies that showed that people that use these medications were more protected and were safer.”
    Joe Rogan · The Joe Rogan Experience · 2026-11-04 · Uttar Pradesh in India studiesthis week
  • “Why are we going to be facing RNA viruses? Why are we going to say, hey, ivermectin might work on that because it seems to work on all the others, and why is officialdom going to come back and tell us, no, you can't, it's dangerous, it's, there's no evidence, we have a randomized controlled trial that this, that, the”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · unanswered for 26 weeks
  • “They did, and they pretended not to remember what R0, means in the epidem, epidemiological work. The fact that, hydroxychloroquine and ivermectin could be used to bring the R naught below one, which meant that they actually could end the pandemic in their own, right, because when R naught is less than one, the infection goes extinct of its own”
    Bret Weinstein · DarkHorse Podcast · 2026-10-04 · unanswered for 5 weeks
  • “we have a drug that was discovered due to its antiparasitic value that turns out to have broad-scale antiviral effectiveness, works against Most, if not all, single-stranded RNA viruses by a host of different mechanisms and is so safe that if there's a chance that you're infected with a single-stranded RNA virus, it's a good bet that it would reduce”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · The Mechanisms of Action of Ivermectin Against SARS-CoV-2, an Extensive Reviewunanswered for 26 weeks
  • “one of the things that unfolded in discussion about, hey, it's a single-stranded RNA virus, ivermectin is probably pretty useful, is there was a lot of pushback. There was the usual stuff about there's no evidence that, which is meaningless, especially the real problem for them with ivermectin is that it's so safe that the argument against giving it to”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · unanswered for 26 weeks
  • “It doesn't just work on RNA viruses. It also works on helmets. It all, like, it works on so many things. And the idea that what you need, even though we've previously put this as one of our top medicines to use, if, you know, To use, both because it tends to be safe and it tends to be effective”
    Heather Heying · DarkHorse Podcast · 2026-05-09 · unanswered for 26 weeks
  • “with a drug this safe, and it is as safe as any drug out there, the, you know, was it given to the people on the ship? It would be an obvious thing to do.”
    Bret Weinstein · DarkHorse Podcast · 2026-05-09 · unanswered for 26 weeks
  • “people are still confused about, about ivermectin, a drug which, for reasons I'm unclear on, is So safe that it is almost impossible to take enough of it to do significant damage to yourself.”
    Bret Weinstein · DarkHorse Podcast · 2026-07-12 · unanswered for 17 weeks
  • “If you allow people to use ivermectin, they will discover how effective it is against COVID. Why? Because like hydroxychloroquine, it is actually generally useful over RNA viruses.”
    Bret Weinstein · DarkHorse Podcast · 2026-02-18 · unanswered for 37 weeks
  • “Even still, if you go to the papers in which they showed that ivermectin was ineffective against COVID, these RCTs that we treat with religious reverence for no good reason. The papers actually say that even when you set up a study to fail, ivermectin is so effective that it still works. You have to look at the data. You”
    Bret Weinstein · DarkHorse Podcast · 2026-07-12 · unanswered for 17 weeks
  • “I remember when we got to the story of ivermectin. I remember literally saying, what the fuck is this? Why would, why would we not be using a drug that has as much promise as this does in this case?”
    Bret Weinstein · DarkHorse Podcast · 2025-11-12 · unanswered for 51 weeks

Listeners of “Ivermectin is very safe and offers significant COVID-19 benefits that justify widespread use.” have not heard (2 arguments)

Listeners of these shows have not heard Zukerman's point that large later ivermectin studies with thousands of people found no COVID-19 benefit. They also have not heard her argument that ivermectin is not visibly saving many severely ill COVID-19 patients in the best available outcome data.

2 unanswered arguments, in their words
  • “Whatever is going on with ivermectin, it's not saving bucket loads of really sick people. If it was, we'd see it clearly in the data, and we don't. ... the best data we have tells us that ivermectin really isn't doing much here.”
    Wendy Zukerman · Science Vs · 2025-11-27 · unanswered for 49 weeks
  • “when we got better studies later on with thousands of people, we found out that ivermectin did not work for COVID.”
    Wendy Zukerman · Science Vs · 2025-11-27 · studies later on with thousands of peopleunanswered for 49 weeks
Bottom line

Supporters lean on safety claims and mechanistic or contextual evidence, like broad RNA virus activity and R0 reduction, that critics' shows do not present. Critics lean on large later ivermectin trials and outcome patterns showing little effect on severe COVID-19, which supporter shows do not present.

What changed

Published because: 3 shows, 2 positions, 356 days of debate. Questions publish only when claims come from at least three shows, at least two positions are held by different people, and the debate has lasted two weeks.

Pairs are matched by content across different episodes and shows; no exchange between these speakers took place unless both quotes come from the same episode.

The prose on this page is written by a model from the quotes shown, and every sentence of it rests on quotes you can open; sentences that could not be traced to a quote were removed before publishing. Positions are placed from each speaker's own words. Evidence labels say what the speaker cited, never whether it is true.

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