# Ivermectin-benzimidazole prescribing following celebrity endorsement

Source: https://onco.cc/key-papers/paper-rockwell-ivermectin-benzimidazole-prescribing-jama-netw-open-2026/  
OnCo record `paper-rockwell-ivermectin-benzimidazole-prescribing-jama-netw-open-2026` (Key paper). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

After a January 2025 podcast promoted ivermectin with a dog dewormer as a cancer cure, US prescriptions of the combination doubled overall and rose 2.6-fold among people with cancer, most steeply in the South.

## Summary

Using electronic records from 67 US health care organisations covering 68,373,949 patients, the authors compared same-day ivermectin plus benzimidazole prescribing from January to July 2025 with the same months of 2024 (Rockwell JAMA Network Open 2026). Overall prescribing doubled, rate ratio 1.97 with a 99.5 percent confidence interval of 1.70 to 2.29, and among patients with a cancer diagnosis it rose 2.63-fold, 99.5 percent confidence interval 2.08 to 3.24, with larger rises in men, in adults under 65, in White patients and in the South (Rockwell JAMA Network Open 2026). The authors note that no rigorous trial evidence supports ivermectin, fenbendazole or other benzimidazoles for cancer, and that the podcast was viewed more than 60 million times (Rockwell JAMA Network Open 2026).

## Fields

- Kind: Key paper
- Last checked: 2026-09-24
- Journal: JAMA Network Open
- Year: 2026
- DOI: 10.1001/jamanetworkopen.2026.16780
- Authors: Rockwell MS, Kahn KL, Fendrick AM, Vangala S, Mafi JN.
- Findings: Combination prescribing doubled after the January 2025 endorsement: rate ratio 1.97 (99.5 percent CI 1.70 to 2.29).; Among patients with cancer the rate ratio was 2.63 (99.5 percent CI 2.08 to 3.24); in the South, 3.91.
- What it means: Measures the reach of the claim rather than the drug: tens of thousands of prescriptions written on the strength of a podcast, with no trial behind them.
- Caveats: Observational; prescriptions ordered, not dispensed or taken; cannot show whether patients delayed conventional treatment.

## Sources

- Rockwell JAMA Network Open 2026: https://doi.org/10.1001/jamanetworkopen.2026.16780
- PubMed: https://pubmed.ncbi.nlm.nih.gov/42118539/

## Connected records

- technologies: [Fenbendazole, ivermectin and other internet 'repurposed cures'](https://onco.cc/technologies/fenbendazole-ivermectin-repurposing-claims/)
- drugs: [Fenbendazole (veterinary anthelmintic)](https://onco.cc/drugs/fenbendazole/), [Ivermectin](https://onco.cc/drugs/ivermectin/), [Mebendazole](https://onco.cc/drugs/mebendazole/)
- bottlenecks: [Misinformation and unproven therapies](https://onco.cc/bottlenecks/b-misinformation/)

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