Ivermectin for Cancer: Dr. William Makis Protocol Explained (2026 Guide)

A balanced, evidence-informed guide for cancer patients and caregivers exploring ivermectin as a repurposed therapy — what the research shows, what it doesn't, and how to proceed safely.

Contents

  1. Who Is Dr. William Makis?
  2. How Ivermectin May Work Against Cancer
  3. The Core Protocols (2025–2026)
  4. What the Research Actually Shows
  5. Reported Patient Outcomes
  6. Risks, Side Effects & Drug Interactions
  7. How to Access Ivermectin Safely
  8. Frequently Asked Questions
  9. Key Takeaways
Medical Disclaimer:

This article is for educational purposes only and does not constitute medical advice. Ivermectin used in cancer care is off-label and investigational. The evidence base is still developing. Do not start, stop, or change any treatment without guidance from a licensed physician who knows your full medical history. Individual outcomes vary significantly.


1. Who Is Dr. William Makis?

Dr. William Makis is a Canadian-trained physician with a background in nuclear medicine and radiology (McGill University, 110+ peer-reviewed publications in imaging and oncology). Since 2023, he has been publicly documenting the use of repurposed antiparasitic drugs — primarily high-dose ivermectin combined with benzimidazoles — for cancer patients who have not responded to, or have declined, conventional treatments.

He shares patient cases and dosing guidance through his Substack publication and on X (formerly Twitter, @MakisMD). His approach draws from the growing body of preclinical research on ivermectin's potential anti-tumor mechanisms, as well as an emerging set of real-world observational reports.

Important Context:

Dr. Makis clinical claims are based on anecdotal patient reports and preclinical research, not completed randomized controlled trials. His work should be understood as hypothesis-generating, not practice-defining. That said, he is one of the most active practitioners publicly documenting this area, and his protocols are being followed by many patients globally.

2. How Ivermectin May Work Against Cancer

Ivermectin was developed as an antiparasitic drug and has a well-established safety record at standard doses. Researchers have identified several mechanisms by which it may interfere with cancer cell biology:
  • Microtubule disruptionBlocks the structural scaffolding cancer cells need to dividePreclinical
  • P-glycoprotein inhibitionMay reduce drug resistance in tumors, potentially making other treatments more effectivePreclinical
  • WNT/β-catenin pathway suppressionInterferes with a signaling pathway involved in cancer stem cell survival and tumor growthPreclinical
  • Mitochondrial dysfunction in tumorsSelectively impairs energy production in cancer cells, which rely heavily on mitochondrial metabolismEarly/in vitro
  • Immune modulationMay enhance the body's anti-tumor immune response, though this mechanism is the least well-characterisedTheoretical
In a comprehensive 2020 study (Juarez et al.), ivermectin was tested against 28 cancer cell lines. The most responsive were ovarian, breast, glioblastoma, lung, and colon cancers. It is important to note that cell line results do not automatically translate to human outcomes — many drugs that work in a lab do not work in patients, or require very different doses.

3. The Core Protocols (2025–2026)

The following protocols are based on Dr. Makis's publicly shared guidance as of early 2026. These are presented for informational purposes. None of these should be self-administered. Dosages, combinations, and duration must be individualized by a physician with access to your labs, imaging, and medical history.
⚠ Safety Note on DosingStandard approved ivermectin doses for parasitic infection are approximately 0.2 mg/kg as a single dose. The doses described below are significantly higher and are off-label. Continuous high-dose ivermectin carries real risks (see Section 6). Liver function, kidney function, and drug interactions must be monitored regularly by a physician.

Protocol 1 — Standard (Most Common Cancers)

Applicable Cancer Types

Breast, colon, lung, prostate, melanoma, renal, gastric

Ivermectin Dose

1.0 mg/kg/day, taken daily with a fatty meal for absorption

Combination Partners
  • Fenbendazole 444–1000 mg/day or Mebendazole 1000 mg/day
  • Berberine 500 mg, 2–3× daily
  • CBD oil 100 mg/day
Suggested Duration

Minimum 3–6 months, with regular physician monitoring

Protocol 2 — Aggressive / High-Grade Cancers

Applicable Cancer Types

Lymphoma, leukemia, pancreatic, GBM, sarcoma, triple-negative breast

Ivermectin Dose

1.5–2.0 mg/kg/day — only under active physician supervision

Combination Partners
  • Fenbendazole 1000 mg/day + Mebendazole 1000–1500 mg/day
  • Methylene Blue 50–100 mg/day
  • High-dose Berberine
Suggested Duration

Daily until confirmed response, then taper under physician guidance

Protocol 3 — Low-Dose Ivermectin + High-Dose Benzimidazole

Applicable Cancer Types

Ovarian, uterine, some breast cancers (especially where high ivermectin is not tolerated)

Ivermectin Dose

0.5–1.0 mg/kg/day

Combination Partners
  • Fenbendazole 1000–2222 mg/day (3 days on / 4 off, or continuous)
  • CBD/THC oils, Berberine, Liposomal Curcumin
Suggested Duration

6–12 months minimum with regular labs

Protocol 4 — Maintenance / Remission

Applicable Cancer Types

All cancer types after achieving No Evidence of Disease (NED)

Ivermectin Dose

0.5–1.0 mg/kg, 3–5 days per week only

Combination Partners
  • Fenbendazole 444 mg/day or Mebendazole 500 mg/day
  • Berberine, Vitamin D 10,000–20,000 IU, Liposomal Curcumin
Suggested Duration

Minimum 1–2 years; indefinite based on clinical picture

General Protocol Rules (Per Dr. Makis)

  • Take ivermectin with a high-fat meal to significantly improve absorption
  • Use pharmaceutical-grade 12 mg human tablets only — not veterinary formulations
  • Monitor liver and kidney function every 4–6 weeks
  • Intermittent fasting or a ketogenic diet is recommended alongside for metabolic synergy
  • Topical DMSO application over accessible tumor sites is used by some patients.

4. What the Research Actually Shows

It is important for patients and caregivers to understand the current state of evidence — both its promise and its limitations.
  • Juarez et al. (2020) — 28 Cancer Cell LinesPreclinical

    Ivermectin showed anti-tumor activity across multiple cancer types at 2 mg/kg equivalent doses in vitro. Most responsive: ovarian, breast, glioblastoma, lung, and colon cancers.

  • Mebendazole RCT — Stage 4 Colorectal Cancer (Life Sciences, 2022)Phase 2 RCT

    Adding mebendazole to standard chemo improved 12-week overall response rate (65% vs 10%) and progression-free survival. This is the strongest human trial in this space.

  • EClinicalMedicine (2022) — Mebendazole + Temozolomide in Brain CancerPhase 1

    Encouraging safety and signal data in high-grade glioma. Not powered for efficacy conclusions, but tolerability was acceptable.

  • Hulscher et al. (April 2026) — 197-Patient Observational CohortObservational

    84.4% clinical benefit rate reported: NED 32.8%, tumor regression 15.6%, stable disease 36.1%. No control group; many patients also received conventional treatment. Largest real-world dataset to date, but hypothesis-generating only.

  • Cedars-Sinai Phase I/II (ASCO 2025) — Ivermectin + Balstilimab in Metastatic TNBCActive Trial

    Ongoing. First prospective human trial combining ivermectin with immunotherapy in breast cancer. Results pending — one of the most important studies to watch in 2026.

🔬 What This Means for PatientsThe mebendazole RCT (2022) is the most meaningful human data in this space and is genuinely encouraging. The observational data from the Hulscher study is the largest real-world dataset so far, but without a control group it cannot prove causation. The ivermectin-specific human trials are still early. This is a rapidly evolving area — not settled science, but not fringe either.

5. Reported Patient Outcomes


The following cases were shared publicly via Dr. Makis's Substack and X posts (2024–2026). They are anonymized self-reported accounts. These are anecdotal reports, not clinical trial data. They cannot be used to predict outcomes for any individual patient, and they have not been independently verified.

We include them here because they are part of the public discussion — but we urge readers to weigh them appropriately, as case selection bias (reporting only successes) is a significant concern with this type of evidence.
1

53-year-old woman, Stage 2 TNBC (7.8 cm tumor) — Reported cancer-free after 7 months (December 2024–July 2025)

Cannot confirm: concurrent treatments, staging accuracy, verification of NED status

2

58-year-old, Recurrent Stage 4 Kidney Cancer — Reported dying tumors within 10 weeks

Tumor dying ≠ remission. Definition of outcome not independently verified.

3

70-year-old man, Stage 4 Lymphoma — Reported complete remission in 2.5 months

Lymphoma response rates vary widely; spontaneous remission is also documented in some lymphoma types.

4

39-year-old woman, Stage 4 Colon with liver mets — CEA marker dropped from 441 to 21.9 over 4 months

CEA reduction is meaningful and measurable, though not confirmed by imaging in this report.

5

83-year-old, Stage 3 Follicular Lymphoma — Near-total remission reported at 6 months on 1 mg/kg/day

Follicular lymphoma is naturally indolent; watchful waiting alone can produce remission. Confounding is possible.

⚠ Critical Caveat on Case ReportsDr. Makis's claimed overall response rate of 65–70% in Stage 4 patients is based on self-selected, self-reported cases shared on social media — not a prospectively enrolled, independently verified cohort. Failures and non-responders are less likely to be shared publicly. This does not mean the results are fabricated, but it does mean they cannot be taken at face value without independent validation.

6. Risks, Side Effects & Drug Interactions


Ivermectin has a well-established safety profile at standard antiparasitic doses. At the high doses used in the Makis protocol, the risk picture changes and must be managed actively with a physician.
  • Neurotoxicity: High-dose ivermectin can cross the blood-brain barrier, particularly in patients with certain genetic variants (ABCB1/P-glycoprotein mutations). Symptoms can include dizziness, confusion, vision changes, or seizures.
  • Hepatotoxicity: Liver enzyme elevation is possible, especially when combined with high-dose benzimidazoles. Liver function tests every 4–6 weeks are essential.
  • Drug interactions: Ivermectin interacts with warfarin, certain immunosuppressants, CNS depressants, and CYP3A4-metabolized drugs (including many chemotherapy agents). Full medication review is mandatory.
  • GI side effects: Nausea, diarrhea, and abdominal discomfort are reported in approximately 25% of patients at high doses, per the Hulscher et al. observational study.
  • Unknown long-term safety: There is no long-term human safety data for continuous high-dose ivermectin (months to years). Claims that 2 mg/kg/day is "extremely safe" are not supported by completed long-term studies.
  • Delay of proven treatment: For patients with cancers that have well-established effective treatments (e.g., early-stage breast cancer, certain lymphomas, testicular cancer), delaying conventional therapy to pursue repurposed drugs carries significant risk.

Monitoring Recommended

Any physician supervising this protocol should track: complete blood count (CBC), comprehensive metabolic panel (CMP) including liver and kidney function, tumor markers where applicable, and imaging at regular intervals. Any symptom of neurotoxicity requires immediate dose reduction or cessation.

7. How to Access Ivermectin Safely

Quality and sourcing matter significantly. Veterinary-grade ivermectin formulations (pastes, liquids) have inconsistent concentrations and are not designed for human pharmacokinetics. For anyone considering this protocol, pharmaceutical-grade human tablets are the only appropriate form, and a physician prescription is the appropriate access route.

✅ Key Principles for Safe SourcingOnly use human pharmaceutical-grade 12 mg tablets. Obtain via a licensed physician's prescription. Avoid online sources that do not require a prescription — these are unregulated. Ensure the compounding pharmacy, if used, is US-licensed and follows Good Manufacturing Practice (GMP) standards.

Ivermectin + Mebendazole — Physician-Prescribed Access

The Wellness Company offers a physician-prescribed, pharmacy-compounded ivermectin and mebendazole formula — reviewed by Dr. Peter McCullough. Standardized dosing (25 mg ivermectin + 250 mg mebendazole), quality-tested, and dispensed through US-licensed compounding pharmacies.

View Ivermectin + Mebendazole Formula →

⚠ Affiliate link. This is not a replacement for oncology care. Consult your physician before use. Individual results vary. This product is not FDA-approved to treat cancer.

8. Frequently Asked Questions

Can I take ivermectin alongside my chemotherapy?

Potentially, but only under physician supervision. Ivermectin interacts with several chemotherapy drugs via the CYP3A4 pathway. Some combinations (like with balstilimab, tested at Cedars-Sinai) appear to be under active study. Do not add ivermectin to your regimen without telling your oncologist, as it may affect drug levels and safety.
Is ivermectin FDA-approved to treat cancer?
No. Ivermectin is FDA-approved only for antiparasitic indications (onchocerciasis, strongyloidiasis, scabies, head lice). Its use in cancer is entirely off-label and investigational. This does not mean it cannot be prescribed — physicians can legally prescribe off-label — but it does mean no regulatory body has reviewed cancer-specific safety and efficacy data.
How is ivermectin different from fenbendazole for cancer?
Both are antiparasitic drugs with overlapping proposed mechanisms (microtubule disruption, metabolic interference). Fenbendazole (a benzimidazole) has more published human case reports, partly due to the Joe Tippens story. Ivermectin has more varied proposed mechanisms including immune modulation. Dr. Makis's approach combines both to target multiple pathways simultaneously. They are used together precisely because they appear to work differently and may be synergistic.
Should I use veterinary ivermectin to save money?
No. Veterinary formulations (ivermectin paste, livestock pour-on solutions) contain excipients not intended for humans, have inconsistent and hard-to-measure concentrations, and carry real toxicity risks. Human pharmaceutical-grade tablets are the only appropriate form for human use.
What does "No Evidence of Disease" (NED) actually mean?
NED means that currently available imaging and lab tests show no detectable cancer. It is not the same as being cured — cancer can return after NED. It is, however, a meaningful clinical milestone. When case reports claim NED, it is worth asking: was this confirmed by PET/CT or MRI? By which physician? How long has NED been maintained?
My oncologist won't discuss ivermectin. What should I do?
This is a real and frustrating situation for many patients. Seeking a second opinion from an integrative oncologist — a physician who works with both conventional and complementary approaches — can be helpful. Physicians affiliated with organizations like FLCCC or integrative oncology programs at academic centers may be more open to discussing repurposed drugs. Be transparent with all your physicians about everything you are taking.

Key Takeaways

Ivermectin's anti-cancer potential is a legitimate area of scientific interest, supported by preclinical data and some early human studies — particularly for mebendazole in colorectal cancer. It is not an established cancer treatment, and the gap between promising lab results and proven clinical benefit is significant and not yet bridged.

Dr. Makis has made this space more visible and has given hope to many patients who feel conventional medicine has run out of options. His case reports are numerous and some are striking. But hope must be held alongside honesty: these are not controlled data, outcomes may be influenced by concurrent conventional treatment, and failures are underreported.

For cancer patients considering this path: Work with a physician. Monitor your labs. Do not abandon effective conventional treatments. Understand the difference between what the evidence shows and what it suggests. Ask hard questions — of your oncologist and of advocates for repurposed drugs alike.

References & Further Reading

  1. Juarez M et al. (2020). Antitumor effects of ivermectin at clinically feasible concentrations support its clinical development as a repositioned cancer drug. PLOS ONE.
  2. Elayapillai SP et al. (2021). Ivermectin inhibits growth and induces apoptosis of human ovarian cancer cells. International Journal of Oncology.
  3. Pinto-Díez C et al. (2022). Mebendazole plus FOLFOX4/bevacizumab in Stage 4 colorectal cancer. Life Sciencesdoi:10.1016/j.lfs.2022.120522
  4. Sepulveda-Arias JC et al. (2022). Mebendazole + temozolomide in high-grade glioma. EClinicalMedicinePubMed
  5. Hulscher et al. (April 2026). Real-World Clinical Outcomes of Ivermectin and Mebendazole in Cancer — Observational Cohort (197 patients). Preprint/publication.
  6. Yuan Yuan et al. (ASCO 2025). Phase I/II: Ivermectin + balstilimab in metastatic triple-negative breast cancer. Cedars-Sinai Medical Center.
  7. Makis W. Substack @MakisMD — Protocol updates and patient case reports (2023–2026).

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