Drug interactions
Metformin + Methyclothiazide
Severity: Minor
Metformin and Methyclothiazide: 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
Thiazide diuretics can raise blood glucose, particularly at higher doses, partially opposing the effect of metformin. Thiazides may also affect renal function or volume status, which matters for metformin elimination.
What this interaction means in plain words
Metformin and Methyclothiazide 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-induced impaired glucose tolerance antagonizes metformin; volume depletion or reduced renal function may reduce metformin clearance.
What to do
Monitor blood glucose and renal function after starting or changing the thiazide dose, and adjust metformin if glycemic control worsens or eGFR falls.
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 Metformin
Frequently asked questions
Can I take Metformin with Methyclothiazide?
MediHelp rates the interaction as minor. Metformin and Methyclothiazide have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Thiazide diuretics can raise blood glucose, particularly at higher doses, partially opposing the effect of metformin. Thiazides may also affect renal function or volume status, which matters for metformin elimination.
How serious is the interaction between Metformin and Methyclothiazide?
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 blood glucose and renal function after starting or changing the thiazide dose, and adjust metformin if glycemic control worsens or eGFR falls.
What other medicines interact with Metformin?
MediHelp also lists interactions of Metformin with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin page.
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