Ethambutol & Nutrient Depletion
Also searched as Myambutol, Etibi. What the clinical evidence reports, what it may mean, and what to discuss with your pharmacist.
Ethambutol has been associated with depletion of COPPER and ZINC. This does not mean a deficiency will occur — it means these are worth knowing about and, if you take Ethambutol long-term, worth raising with your pharmacist or healthcare provider.
Take more than one medication? Open the checker with Ethambutol pre-loaded and add the rest to see overlapping nutrient signals.
Reported nutrient depletions with Ethambutol
Each record below is shown as published in our licensed clinical database, with its evidence rating and citations. Expand a section for food sources and talking points.
COPPER
Insufficient EvidenceETHAMBUTOL (Myambutol)
Ethambutol and its metabolite chelate copper, which may result in tissue depletion of copper. It's suggested that copper chelation in the retina might contribute to ethambutol-induced optic neuropathy. Chelation of copper ions in cytochrome-c oxidase may inhibit mitochondrial activity in optic nerve axons. Whether supplemental copper can prevent this side effect isn't known. Preliminary research suggests that copper supplements do not inhibit the antimicrobial action of ethambutol.
Copper helps your body make energy inside cells and keeps nerves working properly. Ethambutol and one of its breakdown products can bind to copper, a process called chelation, which may theoretically pull copper away from tissues, including the nerves in your eyes. Because the evidence here is still very preliminary, researchers do not yet know whether this matters clinically for most people taking the drug. If you have any questions or concerns while on ethambutol, your pharmacist or doctor is the right person to talk with.
What Copper does & food sources
Copper supports iron metabolism, nerve function, and connective tissue formation.
Common food sources:
- Shellfish and organ meats
- Nuts and seeds
- Whole grains
- Dark chocolate
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
What to discuss with your clinician
Copper questions usually arise alongside long-term zinc use or certain absorption conditions — ask your provider whether testing makes sense in your situation.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Supplement considerations
Copper and zinc balance each other; supplementing either long-term without guidance can unbalance the other.
Do not start or stop medications or supplements without professional guidance — supplements can interact with prescription medications.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Learn more about this nutrient: Copper — uses, safety & interactions
References (3)
- Cole A, May PM, Williams DR. Metal binding by pharmaceuticals. Part 1. Copper(II) and zinc(II) interactions following ethambutol administration. Agents Actions 1981;11:296-305. PubMed
- Campbell IA, Elmes PC. Ethambutol and the eye: zinc and copper (letter). Lancet 1975;2:711. DOI
- Kozak SF, Inderlied CB, Hsu HY, et al. The role of copper on ethambutol's antimicrobial action and implications for ethambutol-induced optic neuropathy. Diag Microbiol Infect Dis 1998;30:83-7. PubMed
ZINC
Insufficient EvidenceETHAMBUTOL (Myambutol)
Ethambutol chelates zinc and might reduce plasma and tissue levels. This could contribute to ocular side effects of the drug. The incidence of visual dysfunction increases with the dose of ethambutol, especially above 25 mg/kg/day, and also seems to be more common in people with low plasma zinc levels less than 0.7 mg/L. Counsel patients taking ethambutol to report visual changes, and consider regular monitoring of visual function. Visual changes are usually reversible if the drug is stopped promptly. It is not clear whether zinc supplements are helpful to reduce side effects of ethambutol, and there's some concern that zinc chelation is involved in the mechanism of action of the drug, so taking zinc supplements could reduce its efficacy.
Zinc helps your immune system, wound healing, and eye health, so it is worth knowing that ethambutol appears to bind to zinc in the body, a process called chelation, which may pull zinc out of your tissues and raise how much you lose through urine. The evidence here is still thin, so we cannot say this is a clear-cut problem for most people, but there is an interesting detail: low zinc levels in the blood seem to be linked to a higher chance of vision changes, which are already a known side effect of ethambutol. Do not start zinc supplements on your own without checking first, because zinc might actually interfere with how the drug works. If you notice any changes in your vision while taking ethambutol, let your doctor or pharmacist know right away.
What Zinc does & food sources
Zinc supports immune function, wound healing, taste and smell, and many enzyme systems.
Common food sources:
- Meat and shellfish (especially oysters)
- Beans and lentils
- Nuts and seeds
- Whole grains
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
What to discuss with your clinician
Ask about zinc status if you take an associated medication long-term and notice slow wound healing, frequent infections, or taste changes — a clinician can decide whether testing or an empiric plan makes sense.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Supplement considerations
Zinc competes with copper for absorption — long-term, higher-dose zinc without medical guidance can cause copper deficiency. Zinc also binds some antibiotics in the gut, so dose timing matters.
Do not start or stop medications or supplements without professional guidance — supplements can interact with prescription medications.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Caution: Keep zinc doses moderate and time them away from interacting medications — ask your pharmacist.
Learn more about this nutrient: Zinc — uses, safety & interactions
References (5)
- Campbell IA, Elmes PC. Ethambutol and the eye: zinc and copper (letter). Lancet 1975;2:711. DOI
- Weismann K. Chelating drugs and zinc. Dan Med Bull 1986;33:208-11.
- De Palma P, Franco F, Bragliani G, et al. The incidence of optic neuropathy in 84 patients treated with ethambutol. Metab Pediatr Syst Ophthalmol 1989;12:80-2.
- Solecki TJ, Aviv A, Bogden JG. Effect of a chelating drug on balance and tissue distribution of four essential metals. Toxicology 1984;31:207-16. PubMed
- King AB, Schwartz R. Effects of the antituberculous drug ethambutol on zinc absorption, turnover and distribution in rats fed diets marginal and adequate in zinc. J Nutr 1987;117:704-8. DOI
This tool is educational and is not a substitute for professional medical advice. An association is not a diagnosis and does not mean a deficiency will occur. Always talk to your pharmacist or healthcare provider before starting, stopping, or changing any medication or supplement.
Disclaimer: This checker finds which nutrients might be depleted by prescription or over-the-counter medications. Each nutrient depletion issue is rated based on clinical significance. Use your own professional judgment prior to making clinical decisions.© 2026 Therapeutic Research Center Licensed records refresh weekly · last updated July 3, 2026.
More about Ethambutol
What drug-induced nutrient depletion means
Some medications can, over time, lower the levels of certain vitamins, minerals, or other nutrients — through reduced absorption, increased loss, or changes in how the body uses them.
Association is not deficiency
An entry here means a depletion has been reported or studied — not that it happens to everyone, or that you are deficient. Dose, duration, diet, and your own health all matter.
Evidence varies by pair
Some drug–nutrient links (like metformin and vitamin B12) are well studied; others rest on limited or preliminary research. Each entry shows the evidence rating from our licensed clinical database.
When to ask about labs
If you take an associated medication long-term, ask your healthcare provider whether monitoring is appropriate for you. Not everyone needs testing — your provider can weigh your dose, duration, and symptoms.
Don't self-supplement blindly
Supplements are not risk-free: some can interact with medications, and some (like potassium or magnesium) can be risky with kidney disease. Talk to your pharmacist before adding anything.
Never stop a medication over this
These medications are prescribed for good reasons, and the benefit usually far outweighs a manageable nutrient consideration. Any change belongs in a conversation with your prescriber.
Food first, usually
For many nutrients, a varied diet covers the gap. Each entry lists common food sources; a supplement is a decision to make with your pharmacist or provider, not a default.
Ethambutol & nutrients: FAQs
Does Ethambutol deplete COPPER?
Should I take a supplement because I take Ethambutol?
Should I stop taking Ethambutol?
Where does this information come from?
Questions about Ethambutol and your nutrition?
Ask a licensed pharmacist — free, no appointment needed.
Sources & How We Checked
Nutrient depletion records for Ethambutol are evidence-graded and sourced from the Natural Medicines database, and are displayed as published with their citations.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference for drug-induced nutrient depletions, supplements, and interactions — the basis for this page.
- MedlinePlus, U.S. National Library of Medicine — NIH consumer drug information, used for medication overviews across the site.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.