Drug interactions
furosemide + spironolactone
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.
Overview
Combination alters potassium balance and intravascular volume; risk of hypo- or hyperkalemia and renal function changes; requires close electrolyte monitoring.
Mechanism of action
Loop diuretic increases potassium loss; spironolactone decreases potassium excretion; both affect volume status and GFR.
Clinical management
Monitor serum potassium, sodium, and creatinine at baseline and within 3–7 days after dose changes; adjust doses to maintain potassium in target range and prevent dehydration.
Drug reference
References
- Spironolactone: Drug Monograph — Lexicomp
- Loop and potassium-sparing diuretic combination therapy — UpToDate
Frequently asked questions
Can I take furosemide with spironolactone?
The interaction is rated: Moderate. Combination alters potassium balance and intravascular volume; risk of hypo- or hyperkalemia and renal function changes; requires close electrolyte monitoring.
How serious is the interaction between furosemide and spironolactone?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between furosemide and spironolactone managed?
Monitor serum potassium, sodium, and creatinine at baseline and within 3–7 days after dose changes; adjust doses to maintain potassium in target range and prevent dehydration.
Why do furosemide and spironolactone interact?
Loop diuretic increases potassium loss; spironolactone decreases potassium excretion; both affect volume status and GFR.
Full monographs, dosing and an interaction checker in the MediHelp app
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