Drug interactions
Candesartan-hydrochlorothiazide + Metolazone
Severity: Major
Candesartan-hydrochlorothiazide and Metolazone: 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
Adding metolazone to a thiazide produces strong sequential nephron blockade with a profound diuresis. This can cause severe hypokalemia, hyponatremia, volume depletion, hypotension, and acute kidney injury.
What this interaction means in plain words
Candesartan-hydrochlorothiazide and Metolazone 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.
Candesartan-hydrochlorothiazide belongs to Cardiovascular; Metolazone belongs to Cardiovascular.
Why it happens
Duplicate thiazide-type inhibition of the distal tubule sodium-chloride cotransporter results in excessive natriuresis and potassium loss, compounded by ARB-related hemodynamic effects.
What to do
Avoid combining two thiazide-type diuretics unless specifically intended, and then use low doses. Monitor electrolytes, creatinine, weight, and blood pressure closely.
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 Candesartan-hydrochlorothiazide
- Aliskiren + Candesartan-hydrochlorothiazide Contraindicated
- Candesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Candesartan-hydrochlorothiazide + Sparsentan Contraindicated
- Acemetacin + Candesartan-hydrochlorothiazide Major
- Amifostine + Candesartan-hydrochlorothiazide Major
- Amiloride + Candesartan-hydrochlorothiazide Major
Other interactions of Metolazone
Frequently asked questions
Can I take Candesartan-hydrochlorothiazide with Metolazone?
MediHelp rates the interaction as major. Candesartan-hydrochlorothiazide and Metolazone 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. Adding metolazone to a thiazide produces strong sequential nephron blockade with a profound diuresis. This can cause severe hypokalemia, hyponatremia, volume depletion, hypotension, and acute kidney injury.
How serious is the interaction between Candesartan-hydrochlorothiazide and Metolazone?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining two thiazide-type diuretics unless specifically intended, and then use low doses. Monitor electrolytes, creatinine, weight, and blood pressure closely.
What other medicines interact with Candesartan-hydrochlorothiazide?
MediHelp also lists interactions of Candesartan-hydrochlorothiazide with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Candesartan-hydrochlorothiazide page.
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