Drug interactions
Calcium + Willow bark
Severity: Minor
Calcium and Willow bark: minor 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
Willow bark contains salicin, which is converted to salicylate. Calcium carbonate may alkalinize urine and alter salicylate clearance, though the effect is expected to be small.
What this interaction means in plain words
Calcium and Willow bark have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Urinary alkalinization lowers renal tubular reabsorption of salicylic acid, increasing its excretion.
What to do
No action is usually needed. Be aware of reduced salicylate effect with regular high-dose antacid use.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Calcium
- Calcium + Ceftriaxone Contraindicated
- Acalabrutinib + Calcium Moderate
- Alendronate + Calcium Moderate
- Atazanavir + Calcium Moderate
- Baloxavir marboxil + Calcium Moderate
- Bendroflumethiazide + Calcium Moderate
Frequently asked questions
Can I take Calcium with Willow bark?
MediHelp rates the interaction as minor. Calcium and Willow bark have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Willow bark contains salicin, which is converted to salicylate. Calcium carbonate may alkalinize urine and alter salicylate clearance, though the effect is expected to be small.
How serious is the interaction between Calcium and Willow bark?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No action is usually needed. Be aware of reduced salicylate effect with regular high-dose antacid use.
What other medicines interact with Calcium?
MediHelp also lists interactions of Calcium with, for example, Ceftriaxone, Acalabrutinib, Alendronate. The full list is on the Calcium page.
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