Drug interactions
Eplerenone + Potassium phosphates
Severity: Major
Eplerenone and Potassium phosphates: major interaction.
Last updated Sources: UK SmPC
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 add a potassium load while eplerenone reduces renal potassium excretion. Serious hyperkalemia may result, especially in renal impairment.
What this interaction means in plain words
Eplerenone 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
Aldosterone antagonism reduces potassium excretion while supplementation adds a potassium load.
What to do
Monitor serum potassium and ECG, reduce the potassium dose or hold eplerenone as needed, and check renal function.
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
- Eplerenone 25 mg Film Coated tablet - SmPC sections 4.3/4.5 (class statement: potassium supplements; "Due to increased risk of hyperkalaemia, eplerenone should not be administered to patients receiving other potassium-sparing diuretics and potassium supplements ") — electronic medicines compendium (UK SmPC)
Other interactions of Eplerenone
- Amiloride + Eplerenone Contraindicated
- Atazanavir + Eplerenone Contraindicated
- Clarithromycin + Eplerenone Contraindicated
- Cobicistat + Eplerenone Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Eplerenone Contraindicated
- Ensitrelvir + Eplerenone Contraindicated
Frequently asked questions
Can I take Eplerenone with Potassium phosphates?
MediHelp rates the interaction as major. Eplerenone 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 add a potassium load while eplerenone reduces renal potassium excretion. Serious hyperkalemia may result, especially in renal impairment.
How serious is the interaction between Eplerenone 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 ECG, reduce the potassium dose or hold eplerenone as needed, and check renal function.
What other medicines interact with Eplerenone?
MediHelp also lists interactions of Eplerenone with, for example, Amiloride, Atazanavir, Clarithromycin. The full list is on the Eplerenone page.
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