Drug interactions
Heparin + Spironolactone
Severity: Moderate
Heparin and Spironolactone: moderate 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
Heparin can inhibit aldosterone synthesis and cause hyperkalemia, even within days, and this adds to the potassium-retaining action of spironolactone. Patients with renal impairment or diabetes are at higher risk.
What this interaction means in plain words
Heparin and Spironolactone can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Heparin belongs to Cardiovascular; Spironolactone belongs to Cardiovascular.
Why it happens
Heparin-induced suppression of adrenal aldosterone synthesis adds to mineralocorticoid receptor antagonism.
What to do
Monitor serum potassium at baseline and periodically during heparin therapy, particularly with prolonged use or renal impairment. Reduce or stop spironolactone if hyperkalemia develops.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Spironolactone
- Amiloride + Spironolactone Contraindicated
- Eplerenone + Spironolactone Contraindicated
- Spironolactone + Triamterene Contraindicated
- Abiraterone + Spironolactone Major
- Aceclofenac + Spironolactone Major
- Acemetacin + Spironolactone Major
Other interactions of Heparin
- Defibrotide + Heparin Contraindicated
- Heparin + Ketorolac Contraindicated
- Heparin + Oritavancin Contraindicated
- Acemetacin + Heparin Major
- Acetylsalicylic acid + Heparin Major
- Alteplase + Heparin Major
Frequently asked questions
Can I take Heparin with Spironolactone?
MediHelp rates the interaction as moderate. Heparin and Spironolactone can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Heparin can inhibit aldosterone synthesis and cause hyperkalemia, even within days, and this adds to the potassium-retaining action of spironolactone. Patients with renal impairment or diabetes are at higher risk.
How serious is the interaction between Heparin and Spironolactone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum potassium at baseline and periodically during heparin therapy, particularly with prolonged use or renal impairment. Reduce or stop spironolactone if hyperkalemia develops.
What other medicines interact with Spironolactone?
MediHelp also lists interactions of Spironolactone with, for example, Amiloride, Eplerenone, Triamterene. The full list is on the Spironolactone page.
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