Man Needs Surgery After Ingesting Horse Ivermectin
A 79-year-old patient required two procedures to remove a blockage caused by horse-grade ivermectin paste.
Updated on Oct. 21, 2026 in Large Animals
A 79-year-old man underwent two surgeries to remove a 4-centimeter mass from his small intestine after ingesting horse ivermectin paste. The case, published in May 2026, highlights the severe health risks associated with using veterinary medications intended for large animals.
Why it matters
The patient turned to the veterinary product after his doctor refused to prescribe the medication. Medical professionals warn that the safety and efficacy of animal-grade ivermectin in humans are unknown and potentially dangerous.
The patient ingested a 6.08-gram syringe containing 1.87% ivermectin, which is formulated to treat a 1,250-pound animal. He subsequently required three units of blood transfusions for a hemoglobin level of 7.1.
The players
Yale School of Medicine
This prestigious academic research institution was the site where the medical team treated the patient and documented the case.
West Haven VA
The surgical team responsible for the emergency procedure was based at this medical facility.
The details
Surgeons at the Yale School of Medicine removed the mass and over 50 centimeters of ulcerated bowel tissue. The man, who purchased the paste online, waited to seek care due to embarrassment after developing symptoms, eventually resulting in his discharge to a nursing facility.
Timeline
August 2021: Pandemic-era ivermectin prescriptions peaked at ten times baseline.
May 2026: Yale surgeons published the case report in Cureus.
Culture Shift
This incident reflects a broader trend of patients seeking self-treatment through unconventional sources when standard medical channels are inaccessible. It highlights the potential dangers of disregarding the distinction between human pharmaceutical standards and veterinary-grade chemical formulations.
Readers should be aware that veterinary products are not designed for human consumption and can lead to life-threatening internal injuries. Consulting with a licensed medical professional remains the safest way to address health concerns or medication needs.
The takeaway
Self-medicating with veterinary-grade products can cause severe, life-threatening complications that require invasive emergency surgery. Always adhere to prescriptions provided by licensed physicians rather than purchasing unapproved treatments online.
Further reading
Learn more about the risks associated with animal medication at United States Large Animals.
