Drug interactions
Calcium carbonate + Penicillamine
Severity: Moderate
Calcium carbonate and Penicillamine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Antacids and mineral supplements can substantially reduce penicillamine absorption, which may weaken its therapeutic effect. Calcium forms complexes with penicillamine in the gut.
What this interaction means in plain words
Calcium carbonate and Penicillamine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Calcium carbonate belongs to Gastrointestinal Tract; Penicillamine belongs to Musculoskeletal.
Why it happens
Chelation or binding of penicillamine by calcium in the gastrointestinal tract reduces absorption.
What to do
Take penicillamine on an empty stomach and at least 2 hours apart from calcium carbonate. Monitor clinical response.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Calcium carbonate
Other interactions of Penicillamine
- Gold sodium thiomalate + Penicillamine Major
- Aluminum hydroxide + Penicillamine Moderate
- Calcium + Penicillamine Moderate
- Carbonyl iron + Penicillamine Moderate
- Copper + Penicillamine Moderate
- Digoxin + Penicillamine Moderate
Frequently asked questions
Can I take Calcium carbonate with Penicillamine?
MediHelp rates the interaction as moderate. Calcium carbonate and Penicillamine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Antacids and mineral supplements can substantially reduce penicillamine absorption, which may weaken its therapeutic effect. Calcium forms complexes with penicillamine in the gut.
How serious is the interaction between Calcium carbonate and Penicillamine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Take penicillamine on an empty stomach and at least 2 hours apart from calcium carbonate. Monitor clinical response.
What other medicines interact with Calcium carbonate?
MediHelp also lists interactions of Calcium carbonate with, for example, Acalabrutinib, Alendronate, Amlodipine-hydrochlorothiazide-valsartan. The full list is on the Calcium carbonate page.
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