Some Cancers Being Killed with Antiparasitic – Fenbendazole
Case Reports of people who have treated their own cancers along with other articles to help understand how fenbendazole works to treat cancer.
Almost five years ago we launched this Substack to report on the experiences of those who self-treated their cancers with fenbendazole. Recall that I became involved in this topic because my 83-year-old mother-in-law developed metastatic breast cancer. Having lived a full life she didn’t want to treat her cancer with traditional radiation or chemotherapy because of the side effects, instead chose to leave the hospital in the care of in-home hospice.
Simultaneously, I had read about the potential of fenbendazole as an anticancer agent and after reviewing the mechanisms and apparent lack of adverse side effects, suggested that she try it. She had nothing to lose.
Her husband administered her 222 mg fenbendazole powder each morning in her yogurt. After a few weeks her appearance, activity level and outlook all dramatically improved. She soon dismissed hospice. Within 3-4 months her blood tumor markers dropped to within normal limits and imaging confirmed that the cancer in her liver, bones and lungs was gone.
Her Case Report, along with two others from this Substack, were published in the peer-reviewed oncology journal Case Reports in Oncology in 2025 by William Makis, Ilyes Baghli, Pierrick Martinez; Fenbendazole as an Anticancer Agent? A Case Series of Self-Administration in Three Patients. Case Reports in Oncology 18 December 2025; 18 (1): 856–863. https://doi.org/10.1159/000546362.
Fenbendazole and other antiparasitics are about to enter mainstream awareness. With the State of Florida investing $60M into the study of alternative cancer treatments including antiparasitics, the sea change comprising a can-do attitude and removing the shackles of Big Pharma on cancer research at the Federal level, we stand at the threshold of revolutionary cancer treatments that use agents like fenbendazole, and other repurposed substances that actually work to kill cancer in a safe and cost-effective manner.
Fenbendazole vs. Mebendazole vs. Albendazole vs. Flubendazole: The benzimidazoles are very similar chemically and they have very similar mechanisms of action with respect to disrupting microtubule function, specifically defined as binding to the colchicine-sensitive site of the beta subunit of helminithic (parasite) tubulin thereby disrupting binding of that beta unit with the alpha unit of tubulin which blocks intracellular transport and glucose absorption (Guerini et al., 2019). If someone asks you how fenbendazole kills the cancer cells, the answer is in italics in the previous sentence.
The class of drugs known as benzimidazoles includes fenbendazole, mebendazole, albendazole and flubendazole. Mebendazole is the form that is approved for human use while fenbendazole is approved for veterinary use. The main difference is the cost.
Mebendazole is expensive ~$555 per 100 mg pill, while fenbendazole is inexpensive ~48 cents per 222 mg free powder dose (Williams, 2019). As you may recall, albendazole is the form used to treat intestinal parasites in India and these cost 2 cents per pill.
FYI, to illustrate how Americans are screwed by Big Pharma, two pills of mebendazole cost just $4 in the UK, 27 cents per 100 mg pill in India and $555 per 100 mg pill in the US.
While most of the pre-clinical research uses mebendazole, probably because it is the FDA-approved-for-humans form of fenbendazole, virtually all of the self-treating clinical reports involve the use of fenbendazole.
Because the pre-clinical cancer studies use mebendazole (ironically the human form of fenbendazole) and humans self-treat their cancers with fenbendazole (the animal form of mebendazole) it is very reasonable to assume that mebendazole and fenbendazole are functional equivalents with respect to cancer.
It would be helpful if future pre-clinical and clinical investigations simply used fenbendazole as a practical matter. For the purposes of this Substack, fenbendazole, mebendazole and albendazole are used interchangably.
Where to get fenbendazole
In our experience and the experiences of those that write in, it appears that the three readily available brands of fenbendazole (Panacur-C, FenBen Labs, Happy Healing Labs) are equally effective. Panacur-C can be obtained locally in pet stores, while they all can be obtained from Amazon. The article on Questions & Answers discusses the brands of fenbendazole in detail and shows photos of the various brands referenced.
If you would like to report your experiences with fenbendazole you can do so privately by email my************@****on.me or more publicly in the Comments section in any of the articles. Also, if you know of people who’ve tried fenbendazole, and it didn’t work, we’d be especially interested in hearing from you now. Understanding the conditions and factors that enhance or impede the success of fenbendazole in treating cancer are valuable.
Disclaimer:
Statements on this website have not been evaluated by the Food and Drug Administration. The contents of this website is for educational and informational purposes only and is not intended to be a substitute for professional medical advice, diagnosis or treatment.
This website does not provide any kind of health or medical advice of any kind. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. The case reports presented reflect the real-life experiences and opinions of other readers or users of the website.
The experiences of those readers or users are personal to those particular readers/users and may not necessarily be representative of all readers/users. We do not claim, and you should not assume, that all other readers/users will have the same experiences. Do your own research, consult with relevant medical professionals before attempting to self-treat for any condition.
source fenbendazole.substack.com