Drug interactions
Hydrochlorothiazide-valsartan + Spironolactone
Severity: Major
Hydrochlorothiazide-valsartan and Spironolactone: major 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
Valsartan and spironolactone both reduce potassium excretion and can produce serious hyperkalemia, which may cause arrhythmias. Hydrochlorothiazide lowers potassium and partly offsets the risk, but this cannot be relied on, especially in renal impairment or heart failure.
What this interaction means in plain words
Hydrochlorothiazide-valsartan and Spironolactone 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.
Hydrochlorothiazide-valsartan belongs to Cardiovascular; Spironolactone belongs to Cardiovascular.
Why it happens
Angiotensin receptor blockade and mineralocorticoid receptor antagonism both reduce aldosterone-dependent potassium excretion, giving additive potassium retention.
What to do
Monitor serum potassium and renal function within one week of starting and regularly afterwards. Avoid potassium supplements and reduce or stop spironolactone 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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Other interactions of Hydrochlorothiazide-valsartan
- Aliskiren + Hydrochlorothiazide-valsartan Contraindicated
- Dofetilide + Hydrochlorothiazide-valsartan Contraindicated
- Hydrochlorothiazide-valsartan + Sparsentan Contraindicated
- Aldesleukin + Hydrochlorothiazide-valsartan Major
- Amifostine + Hydrochlorothiazide-valsartan Major
- Amiloride + Hydrochlorothiazide-valsartan Major
Other interactions of Spironolactone
- Amiloride + Spironolactone Contraindicated
- Eplerenone + Spironolactone Contraindicated
- Spironolactone + Triamterene Contraindicated
- Abiraterone + Spironolactone Major
- Aceclofenac + Spironolactone Major
- Acemetacin + Spironolactone Major
Frequently asked questions
Can I take Hydrochlorothiazide-valsartan with Spironolactone?
MediHelp rates the interaction as major. Hydrochlorothiazide-valsartan and Spironolactone 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. Valsartan and spironolactone both reduce potassium excretion and can produce serious hyperkalemia, which may cause arrhythmias. Hydrochlorothiazide lowers potassium and partly offsets the risk, but this cannot be relied on, especially in renal impairment or heart failure.
How serious is the interaction between Hydrochlorothiazide-valsartan and Spironolactone?
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 within one week of starting and regularly afterwards. Avoid potassium supplements and reduce or stop spironolactone if potassium rises.
What other medicines interact with Hydrochlorothiazide-valsartan?
MediHelp also lists interactions of Hydrochlorothiazide-valsartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Hydrochlorothiazide-valsartan page.
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