Drug interactions
Fosinopril + Potassium citrate / citric acid
Severity: Major
Fosinopril and Potassium citrate / citric acid: 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
Potassium citrate adds a potassium load while fosinopril reduces renal potassium excretion. The result can be hyperkalemia, with risk of arrhythmia, notably in patients with renal impairment.
What this interaction means in plain words
Fosinopril and Potassium citrate / citric acid 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 lowers aldosterone, reducing renal potassium excretion and compounding the potassium supplied by the salt.
What to do
Measure serum potassium and renal function at baseline and shortly after starting, then periodically. Reduce the potassium dose or stop it if potassium rises.
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 Fosinopril
- Aliskiren + Fosinopril Contraindicated
- Fosinopril + Protein a column Contraindicated
- Fosinopril + Sacubitril / valsartan Contraindicated
- Fosinopril + Sacubitril-valsartan Contraindicated
- Amifostine + Fosinopril Major
- Amiloride + Fosinopril Major
Frequently asked questions
Can I take Fosinopril with Potassium citrate / citric acid?
MediHelp rates the interaction as major. Fosinopril and Potassium citrate / citric acid 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. Potassium citrate adds a potassium load while fosinopril reduces renal potassium excretion. The result can be hyperkalemia, with risk of arrhythmia, notably in patients with renal impairment.
How serious is the interaction between Fosinopril and Potassium citrate / citric acid?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Measure serum potassium and renal function at baseline and shortly after starting, then periodically. Reduce the potassium dose or stop it if potassium rises.
What other medicines interact with Fosinopril?
MediHelp also lists interactions of Fosinopril with, for example, Aliskiren, Protein a column, Sacubitril / valsartan. The full list is on the Fosinopril page.
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