Drug interactions
Calcium + Sodium polystyrene sulfonate
Severity: Minor
Calcium and Sodium polystyrene sulfonate: 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
Sodium polystyrene sulfonate binds cations in the gut, including calcium, and can lower serum calcium with prolonged use. Calcium may also be exchanged for sodium on the resin, reducing its potassium-binding capacity slightly. Hypocalcemia is the main concern.
What this interaction means in plain words
Calcium and Sodium polystyrene sulfonate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Calcium belongs to Gastrointestinal Tract; Sodium polystyrene sulfonate belongs to Miscellaneous.
Why it happens
The cation-exchange resin binds calcium in the gastrointestinal tract in exchange for sodium.
What to do
Monitor serum calcium and magnesium during repeated or prolonged resin use. Separate oral calcium from the resin by at least 3 hours where practical.
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
Other interactions of Sodium polystyrene sulfonate
Frequently asked questions
Can I take Calcium with Sodium polystyrene sulfonate?
MediHelp rates the interaction as minor. Calcium and Sodium polystyrene sulfonate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Sodium polystyrene sulfonate binds cations in the gut, including calcium, and can lower serum calcium with prolonged use. Calcium may also be exchanged for sodium on the resin, reducing its potassium-binding capacity slightly. Hypocalcemia is the main concern.
How serious is the interaction between Calcium and Sodium polystyrene sulfonate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum calcium and magnesium during repeated or prolonged resin use. Separate oral calcium from the resin by at least 3 hours where practical.
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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