Drug interactions
Amlodipine-hydrochlorothiazide-valsartan + Metolazone
Severity: Major
Amlodipine-hydrochlorothiazide-valsartan 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
Metolazone added to a regimen containing hydrochlorothiazide produces sequential nephron blockade with a markedly greater diuretic effect. This can cause profound hypokalemia, hyponatremia, volume depletion and hypotension, especially in older patients or those with heart failure or renal impairment.
What this interaction means in plain words
Amlodipine-hydrochlorothiazide-valsartan 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.
Amlodipine-hydrochlorothiazide-valsartan belongs to Cardiovascular; Metolazone belongs to Cardiovascular.
Why it happens
Both agents inhibit distal tubular sodium reabsorption, producing additive natriuresis and potassium and magnesium loss.
What to do
Avoid routine combination of two thiazide-type diuretics; if intentional, monitor electrolytes, renal function, weight and blood pressure closely after starting. Consider reducing doses and correcting potassium and magnesium promptly.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Amlodipine-hydrochlorothiazide-valsartan and Metolazone, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Amlodipine-hydrochlorothiazide-valsartan
- Aliskiren + Amlodipine-hydrochlorothiazide-valsartan Contraindicated
- Amlodipine-hydrochlorothiazide-valsartan + Dofetilide Contraindicated
- Amlodipine-hydrochlorothiazide-valsartan + Sparsentan Contraindicated
- Aceclofenac + Amlodipine-hydrochlorothiazide-valsartan Major
- Aldesleukin + Amlodipine-hydrochlorothiazide-valsartan Major
- Amifostine + Amlodipine-hydrochlorothiazide-valsartan Major
Other interactions of Metolazone
Frequently asked questions
Can I take Amlodipine-hydrochlorothiazide-valsartan with Metolazone?
MediHelp rates the interaction as major. Amlodipine-hydrochlorothiazide-valsartan 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. Metolazone added to a regimen containing hydrochlorothiazide produces sequential nephron blockade with a markedly greater diuretic effect. This can cause profound hypokalemia, hyponatremia, volume depletion and hypotension, especially in older patients or those with heart failure or renal impairment.
How serious is the interaction between Amlodipine-hydrochlorothiazide-valsartan 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 routine combination of two thiazide-type diuretics; if intentional, monitor electrolytes, renal function, weight and blood pressure closely after starting. Consider reducing doses and correcting potassium and magnesium promptly.
What other medicines interact with Amlodipine-hydrochlorothiazide-valsartan?
MediHelp also lists interactions of Amlodipine-hydrochlorothiazide-valsartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Amlodipine-hydrochlorothiazide-valsartan page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
