Drug interactions
Bumetanide + Metolazone
Severity: Major
Bumetanide 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
Combining a loop diuretic with metolazone produces sequential nephron blockade and a very strong diuresis. This can cause profound hypokalemia, hyponatremia, hypomagnesemia, volume depletion and kidney injury.
What this interaction means in plain words
Bumetanide 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.
Bumetanide belongs to Cardiovascular; Metolazone belongs to Cardiovascular.
Why it happens
Synergistic natriuresis from blocking sodium reabsorption at both the loop of Henle and the distal convoluted tubule, with increased urinary potassium loss.
What to do
If used for diuretic resistance, start with a low metolazone dose and monitor weight, urine output, sodium, potassium, magnesium and creatinine within the first days. Replace electrolytes as needed and limit duration of combined use.
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 Metolazone
Other interactions of Bumetanide
Frequently asked questions
Can I take Bumetanide with Metolazone?
MediHelp rates the interaction as major. Bumetanide 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. Combining a loop diuretic with metolazone produces sequential nephron blockade and a very strong diuresis. This can cause profound hypokalemia, hyponatremia, hypomagnesemia, volume depletion and kidney injury.
How serious is the interaction between Bumetanide 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: If used for diuretic resistance, start with a low metolazone dose and monitor weight, urine output, sodium, potassium, magnesium and creatinine within the first days. Replace electrolytes as needed and limit duration of combined use.
What other medicines interact with Metolazone?
MediHelp also lists interactions of Metolazone with, for example, Amifostine, Amlodipine-hydrochlorothiazide-valsartan, Amlodipine-olmesartan-hydrochlorothiazide. The full list is on the Metolazone page.
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