Drug interactions
Captopril + Sodium phosphates
Severity: Major
Captopril and Sodium phosphates: major 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
ACE inhibitors may increase the risk of acute phosphate nephropathy and kidney injury with sodium phosphate bowel preparations or high-dose phosphate. Volume depletion further increases the risk.
What this interaction means in plain words
Captopril and Sodium phosphates can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Reduced glomerular filtration pressure from ACE inhibition adds to phosphate-induced renal tubular injury and volume depletion.
What to do
Avoid sodium phosphate bowel preparations in patients on ACE inhibitors and use an alternative preparation. If phosphate is given, ensure hydration and monitor renal function and electrolytes.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Captopril
- Aliskiren + Captopril Contraindicated
- Captopril + Sacubitril / valsartan Contraindicated
- Captopril + Sacubitril-valsartan Contraindicated
- Amifostine + Captopril Major
- Amiloride + Captopril Major
- Amlodipine-hydrochlorothiazide-valsartan + Captopril Major
Frequently asked questions
Can I take Captopril with Sodium phosphates?
MediHelp rates the interaction as major. Captopril and Sodium phosphates can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. ACE inhibitors may increase the risk of acute phosphate nephropathy and kidney injury with sodium phosphate bowel preparations or high-dose phosphate. Volume depletion further increases the risk.
How serious is the interaction between Captopril and Sodium phosphates?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid sodium phosphate bowel preparations in patients on ACE inhibitors and use an alternative preparation. If phosphate is given, ensure hydration and monitor renal function and electrolytes.
What other medicines interact with Captopril?
MediHelp also lists interactions of Captopril with, for example, Aliskiren, Sacubitril / valsartan, Sacubitril-valsartan. The full list is on the Captopril page.
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