A short explanation for people who may have come across these claims online

Recently, I saw a patient with newly diagnosed non-Hodgkin’s lymphoma. Like many thoughtful and proactive patients, he had been doing some reading online about possible treatments. During our conversation he mentioned that he had come across information suggesting that ivermectin could be used to treat cancer. He had even found a book promoting this idea.

This situation is not unusual. Many patients today do their own research, and that is a good thing. People want to understand their illness and take an active role in their care. However, the internet contains a mixture of useful information, misunderstandings, and sometimes misleading claims.

I thought it might be helpful to address some of the common myths about ivermectin and fenbendazole in cancer treatment.

What are ivermectin and fenbendazole?

These medications were not developed to treat cancer.

Ivermectin

  • A medicine used to treat parasitic infections in humans, such as scabies or certain intestinal parasites.
  • It has been used safely for decades when prescribed appropriately.

Fenbendazole

  • A veterinary deworming medication used in animals.
  • It is not approved for use in humans.

Both drugs work by interfering with structures that parasites need to survive.

Why are they sometimes linked to cancer treatment?

Some laboratory studies have shown that these drugs can affect cancer cells in test tubes or animal experiments.

Researchers often test many existing drugs in the laboratory to see whether they might have additional uses. This is a normal part of scientific exploration.

However, an important point is often missed:

Most substances that kill cancer cells in a laboratory do not work as cancer treatments in people.

Cancer biology inside the human body is far more complex than what happens in a dish in a laboratory.

What does real medical evidence show?

To know whether a treatment truly works, it must go through clinical trials involving large numbers of patients.

These studies carefully examine:

  • whether tumours shrink
  • whether people live longer
  • what side effects occur

At present:

There is no reliable clinical evidence that ivermectin or fenbendazole treat cancer in humans.

Most claims circulating online come from:

  • anecdotal reports
  • personal stories
  • interpretations of laboratory studies

While personal experiences can be compelling, they do not provide reliable scientific evidence.

Are there risks?

Yes.

Using unproven treatments can create several problems.

1. Delaying effective therapy

For many cancers, including lymphoma, we have treatments that are well studied and have helped many people. Delaying these treatments while trying unproven alternatives may allow the disease to progress.

2. Unknown safety

Fenbendazole has not been adequately studied in humans. Veterinary medications may also contain formulations not designed for human use.

3. False expectations

When someone is facing a serious illness, it is understandable to search for hope. Unfortunately, some claims on the internet can offer unrealistic expectations.

Why do these ideas spread?

There are several reasons:

  • People naturally look for simple and inexpensive cures
  • Personal stories can feel very convincing
  • Scientific studies are sometimes misinterpreted or taken out of context
  • Social media allows information to spread very quickly

The most important message

Patients asking questions and doing their own research is something I welcome. Good medicine should always involve open discussion.

If you come across a treatment online that seems promising, the best approach is simple:

Bring it to your doctor and discuss it openly.

Medicine progresses through careful research and clinical trials. When a treatment truly works, it eventually becomes part of standard medical practice.

Until then, it is important to rely on treatments that have been proven to help patients safely and effectively.

✔ A final thought

Curiosity and questioning are healthy. The goal is not to discourage patients from asking questions, but to help them separate scientific evidence from hopeful speculation.

And those conversations — like the one I had recently with my patient — are an important part of good care.