Drug interactions
Metolazone + Norepinephrine
Severity: Moderate
Metolazone and Norepinephrine: 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
Norepinephrine given systemically can cause modest potassium shifts, and with metolazone-induced potassium loss, hypokalemia and arrhythmia risk may increase. Thiazide diuretics may also alter vascular responsiveness to pressors.
What this interaction means in plain words
Metolazone and Norepinephrine 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.
Why it happens
Metolazone causes renal potassium wasting while adrenergic stimulation promotes cellular potassium uptake, giving additive hypokalemia.
What to do
Monitor serum potassium and ECG in patients receiving norepinephrine infusions with metolazone. Replace potassium and magnesium as required.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Metolazone and Norepinephrine, 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 7 days on the web. No card needed.
Other interactions of Metolazone
Frequently asked questions
Can I take Metolazone with Norepinephrine?
MediHelp rates the interaction as moderate. Metolazone and Norepinephrine 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. Norepinephrine given systemically can cause modest potassium shifts, and with metolazone-induced potassium loss, hypokalemia and arrhythmia risk may increase. Thiazide diuretics may also alter vascular responsiveness to pressors.
How serious is the interaction between Metolazone and Norepinephrine?
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 and ECG in patients receiving norepinephrine infusions with metolazone. Replace potassium and magnesium as required.
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.
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.
