Penicillamine & Nutrient Depletion
Also searched as Cuprimine, Depen Titratable. What the clinical evidence reports, what it may mean, and what to discuss with your pharmacist.
Penicillamine has been associated with depletion of IRON, VITAMIN B6, MAGNESIUM and ZINC and 1 more. This does not mean a deficiency will occur — it means these are worth knowing about and, if you take Penicillamine long-term, worth raising with your pharmacist or healthcare provider.
Take more than one medication? Open the checker with Penicillamine pre-loaded and add the rest to see overlapping nutrient signals.
Reported nutrient depletions with Penicillamine
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.
IRON
Insignificant DepletionPENICILLAMINE (Cuprimine, Depen)
Penicillamine chelates iron in the gastrointestinal tract and decreases absorption. If iron supplements are used, separate from penicillamine by at least 2 hours.
Iron is something your body needs to carry oxygen in the blood and keep your energy up. Penicillamine has a tendency to grab onto iron in the stomach and intestines, a process called chelation, which can reduce how much iron your body absorbs. That said, the evidence puts this in the 'insignificant' category, meaning most people taking penicillamine do not need to worry about iron levels or add a supplement. If you do take iron for another reason, a pharmacist can remind you to space it out from penicillamine by a couple of hours so neither medicine is affected.
What Iron does & food sources
Iron is the core of hemoglobin, which carries oxygen in red blood cells.
Common food sources:
- Red meat and poultry
- Beans and lentils
- Fortified cereals
- Spinach (plant iron absorbs better with vitamin C)
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
What to discuss with your clinician
Iron status is easy to assess (ferritin, iron studies, blood counts). Ask your provider before supplementing — unexplained low iron always deserves a medical evaluation for the cause, not just replacement.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Supplement considerations
Iron supplements commonly cause constipation or stomach upset and interfere with the absorption of several medications (thyroid medication, some antibiotics). Do not take iron "just in case" — excess iron is harmful.
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: Never self-treat suspected anemia; the underlying cause matters as much as the iron level.
Learn more about this nutrient: Iron — uses, safety & interactions
References (1)
- Cantilena LR, Klaassen CD. The effect of chelating agents on the excretion of endogenous metals. Toxicol Appl Pharmacol 1982;63:344-50.
VITAMIN B6
Major DepletionPENICILLAMINE (Cuprimine, Depen)
Penicillamine inhibits the activity of vitamin B6, possibly by forming an inactive complex with pyridoxal phosphate. This has been linked to the development of peripheral and optic neuropathy. When penicillamine is used for treatment of Wilson's Disease, it's recommended that patients take vitamin B6 (pyridoxine) 25 mg dilay. Guidelines haven't been established for the use of vitamin B6 with penicillamine in the treatment of other conditions, although supplements of 50-150 mg daily have been used. Monitor patients for early signs of peripheral neuropathy, such as paresthesias, numbness, and tingling, and give vitamin B6 supplements if these occur. For information on foods that are rich in vitamin B6, see our chart.
Vitamin B6 is something your nerves depend on to work properly, and penicillamine has a well-known way of interfering with it: the drug chemically binds to the active form of B6 in your body, essentially locking it up so it can no longer do its job. This is considered a major, clinically meaningful interaction, not a theoretical one, and nerve symptoms like tingling or numbness in the hands and feet have been linked to it. Most guidelines recommend a B6 supplement for patients on penicillamine, but the right dose can vary depending on why you are taking the drug, so please talk with your doctor or pharmacist about whether a supplement is appropriate for you.
What Vitamin B6 does & food sources
Vitamin B6 is involved in protein metabolism, neurotransmitter production, and red blood cell formation.
Common food sources:
- Poultry and fish
- Potatoes and starchy vegetables
- Bananas
- Fortified cereals
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
What to discuss with your clinician
With some medications (for example, isoniazid), B6 is intentionally co-prescribed — follow your prescriber's plan. Otherwise, ask whether testing or supplementation is appropriate if you have symptoms like numbness or tingling.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Supplement considerations
Paradoxically, long-term high-dose B6 can itself cause nerve symptoms — this is a nutrient where more is definitely not better.
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: Avoid high-dose B6 without medical guidance; sustained high intakes can cause neuropathy.
Learn more about this nutrient: Vitamin B6 — uses, safety & interactions
References (3)
- Seelig MS. Auto-immune complications of D-penicillamine - A possible result of zinc and magnesium depletion and of pyridoxine inactivation. J Am Coll Nutr 1982;1:207-14. PubMed
- Pool KD, Feit H, Kirkpatrick J. Penicillamine-induced neuropathy in rheumatoid arthritis. Ann Intern Med 1981;95:457-8. PubMed
- Fauci AS, Braunwald E, Isselbacher KJ, et al. Harrison's Principles of Internal Medicine, 14th ed. New York, NY: McGraw-Hill, 1998.
MAGNESIUM
Moderate DepletionPENICILLAMINE (Cuprimine, Depen)
Penicillamine chelates magnesium, although with lower affinity than other metals such as copper, iron, and zinc. It can potentially contribute to hypomagnesemia, especially in people with other factors which lower serum magnesium. Magnesium supplements should be taken several hours apart from penicillamine to avoid forming non-absorbable chelates in the gut. For information on foods that are rich in magnesium, see our chart.
Penicillamine has a unique chemical property: it latches onto certain minerals in your digestive tract before your body can absorb them, and magnesium, which helps your muscles, nerves, and heart rhythm work properly, is one of those minerals. Because of this binding effect in the gut, long-term users can end up with lower magnesium levels, and this is rated as a moderate concern, meaning some people genuinely do need a supplement. If you take magnesium separately, timing matters a lot, so please ask your pharmacist or doctor how to space it safely from your penicillamine dose.
What Magnesium does & food sources
Magnesium is involved in muscle and nerve function, heart rhythm, blood sugar control, and bone health.
Common food sources:
- Nuts and seeds (almonds, pumpkin seeds)
- Whole grains
- Leafy green vegetables
- Beans and legumes
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
What to discuss with your clinician
Ask whether a magnesium level is worth checking if you take an associated medication long-term — particularly with symptoms like muscle cramps, twitching, or palpitations. Blood levels do not always reflect total body stores, which is worth discussing too.
HelloPharmacist pharmacist-reviewed education — separate from the licensed record above.
Supplement considerations
Magnesium supplements come in many forms and can cause loose stools at higher doses. They can also bind some medications in the gut (certain antibiotics, thyroid medication), so timing matters — check with your pharmacist.
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: Magnesium supplementation can be risky in kidney disease, where magnesium can accumulate — always check with a clinician first if your kidney function is reduced.
Learn more about this nutrient: Magnesium — uses, safety & interactions
References (2)
- Cantilena LR, Klaassen CD. The effect of chelating agents on the excretion of endogenous metals. Toxicol Appl Pharmacol 1982;63:344-50.
- Seelig MS. Auto-immune complications of D-penicillamine - A possible result of zinc and magnesium depletion and of pyridoxine inactivation. J Am Coll Nutr 1982;1:207-14. PubMed
ZINC
Moderate DepletionPENICILLAMINE (Cuprimine, Depen)
Penicillamine forms chelates with zinc, increasing urinary zinc excretion, but also increasing intestinal zinc absorption. In general, the two effects probably cancel out. However, there is a case report of severe, symptomatic zinc deficiency after two years of treatment with up to 2 grams/day of penicillamine. Monitor patients for signs and symptoms of zinc deficiency. If a supplement is necessary, the dose should be separated from penicillamine by 1-2 hours.
Zinc helps your immune system, wound healing, and your sense of taste and smell, so keeping levels in a healthy range matters. Penicillamine is a chelating drug, meaning it binds to zinc in the body and pulls more of it out through the urine. The catch is that it also nudges the gut to absorb a bit more zinc, and for most people those two forces roughly balance each other out. Still, at higher doses over a long period, zinc levels can fall enough to cause real symptoms in some patients, so it is worth asking your doctor or pharmacist whether monitoring or a supplement makes sense for you.
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 (6)
- Brewer GJ, Yuzbasiyan-Gurkan V, Johnson V, et al. Treatment of Wilson's disease with zinc: XI. Interaction with other anticopper agents. J Am Coll Nutr 1993;12:26-30. PubMed
- Seelig MS. Auto-immune complications of D-penicillamine - A possible result of zinc and magnesium depletion and of pyridoxine inactivation. J Am Coll Nutr 1982;1:207-14. PubMed
- Cantilena LR, Klaassen CD. The effect of chelating agents on the excretion of endogenous metals. Toxicol Appl Pharmacol 1982;63:344-50.
- Weismann K. Chelating drugs and zinc. Dan Med Bull 1986;33:208-11.
- McCall JT, Goldstein NP, Randall RV, Gross JB. Comparative metabolism of copper and zinc in patients with Wilson's Disease (hepatollenticular degeneration). Am J Med Sci 1967;254:13-23.
- Kingberg WG, Prasad AS, Oberleas D. Zinc deficiency following penicillamine therapy. In: Prasad AS (ed). Trace Elements in Human Health and Disease. Vol.I, Zinc and Copper. Academic Press, New York, 1976. pp51-65.
COPPER
Insufficient EvidencePENICILLAMINE (Cuprimine, Depen)
Penicillamine chelates copper in the gastrointestinal tract and decreases absorption. To avoid this interaction, copper supplements should be separated from penicillamine by at least 2 hours.
Copper helps your body build healthy blood vessels, supports your immune system, and keeps your nerves working properly. Penicillamine works by latching onto copper molecules in your gut, which can pull the mineral out before your body has a chance to absorb it. That said, the evidence here is rated as insufficient, meaning researchers have not yet established whether this actually causes a meaningful problem for most people taking the drug. If you have been on penicillamine for a long time, it is worth mentioning this to your pharmacist or doctor so they can decide whether any monitoring makes sense for you.
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 (4)
- Campbell IA, Elmes PC. Ethambutol and the eye: zinc and copper (letter). Lancet 1975;2:711. DOI
- Segal S, Kaminski S. Drug-nutrient interactions. American Druggist 1996 Jul;42-8.
- 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
- Cantilena LR, Klaassen CD. The effect of chelating agents on the excretion of endogenous metals. Toxicol Appl Pharmacol 1982;63:344-50.
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 Penicillamine
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.
Penicillamine & nutrients: FAQs
Does Penicillamine deplete IRON?
Should I take a supplement because I take Penicillamine?
Should I stop taking Penicillamine?
Where does this information come from?
Questions about Penicillamine and your nutrition?
Ask a licensed pharmacist — free, no appointment needed.
Sources & How We Checked
Nutrient depletion records for Penicillamine 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.