Drug interactions
Captopril + Potassium phosphates
Severity: Major
Captopril and Potassium phosphates: major interaction.
Last updated Sources: US FDA label
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
Intravenous potassium phosphates deliver potassium directly, and captopril limits renal potassium excretion. Hyperkalemia can develop rapidly and cause dangerous arrhythmias, especially with renal dysfunction.
What this interaction means in plain words
Captopril and Potassium 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
ACE inhibition reduces aldosterone, decreasing renal potassium excretion, while the infusion adds exogenous potassium.
What to do
Monitor serum potassium and renal function frequently during infusion, and adjust the infusion rate or dose according to results.
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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References
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 Potassium phosphates?
MediHelp rates the interaction as major. Captopril and Potassium 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. Intravenous potassium phosphates deliver potassium directly, and captopril limits renal potassium excretion. Hyperkalemia can develop rapidly and cause dangerous arrhythmias, especially with renal dysfunction.
How serious is the interaction between Captopril and Potassium 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: Monitor serum potassium and renal function frequently during infusion, and adjust the infusion rate or dose according to results.
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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