Drug interactions
Metformin + Metolazone
Severity: Moderate
Metformin and Metolazone: 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
Metolazone can raise blood glucose and reduce the glucose-lowering effect of metformin. Glycemic control may worsen after the diuretic is started or increased.
What this interaction means in plain words
Metformin and Metolazone 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.
Metformin belongs to Endocrine; Metolazone belongs to Cardiovascular.
Why it happens
Thiazide-like diuretics impair insulin secretion and sensitivity, partly via hypokalemia, opposing antihyperglycemic therapy.
What to do
Monitor blood glucose and HbA1c after starting or changing metolazone. Adjust the antidiabetic regimen if needed and monitor renal function.
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?
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Other interactions of Metolazone
Other interactions of Metformin
Frequently asked questions
Can I take Metformin with Metolazone?
MediHelp rates the interaction as moderate. Metformin and Metolazone 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. Metolazone can raise blood glucose and reduce the glucose-lowering effect of metformin. Glycemic control may worsen after the diuretic is started or increased.
How serious is the interaction between Metformin and Metolazone?
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 blood glucose and HbA1c after starting or changing metolazone. Adjust the antidiabetic regimen if needed and monitor renal function.
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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