Drug interactions
Magnesium sulfate + Metolazone
Severity: Minor
Magnesium sulfate and Metolazone: minor 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 promotes urinary magnesium loss, which can lower serum magnesium over time. In patients receiving magnesium sulfate for replacement or obstetric use, the effect of the dose may be partly offset and electrolyte disturbances can add to arrhythmia risk.
What this interaction means in plain words
Magnesium sulfate and Metolazone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Thiazide-like diuretic action increases renal magnesium excretion.
What to do
Monitor serum magnesium, potassium and calcium during combined use and adjust magnesium supplementation to the measured level.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Metolazone
Frequently asked questions
Can I take Magnesium sulfate with Metolazone?
MediHelp rates the interaction as minor. Magnesium sulfate and Metolazone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Metolazone promotes urinary magnesium loss, which can lower serum magnesium over time. In patients receiving magnesium sulfate for replacement or obstetric use, the effect of the dose may be partly offset and electrolyte disturbances can add to arrhythmia risk.
How serious is the interaction between Magnesium sulfate and Metolazone?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum magnesium, potassium and calcium during combined use and adjust magnesium supplementation to the measured level.
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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