Drug interactions
Metformin-sitagliptin + Methyclothiazide
Severity: Moderate
Metformin-sitagliptin and Methyclothiazide: 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
Thiazide diuretics can raise blood glucose and so may weaken the glycemic control achieved with metformin and sitagliptin. Thiazides can also reduce renal function in volume-depleted patients, which may increase metformin exposure and the risk of lactic acidosis.
What this interaction means in plain words
Metformin-sitagliptin and Methyclothiazide 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
Thiazides cause pharmacodynamic antagonism by impairing insulin secretion and sensitivity, and volume depletion may reduce renal metformin clearance.
What to do
Monitor blood glucose and renal function after starting or changing the thiazide dose, and adjust antidiabetic therapy as needed.
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 Metformin-sitagliptin
Frequently asked questions
Can I take Metformin-sitagliptin with Methyclothiazide?
MediHelp rates the interaction as moderate. Metformin-sitagliptin and Methyclothiazide 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. Thiazide diuretics can raise blood glucose and so may weaken the glycemic control achieved with metformin and sitagliptin. Thiazides can also reduce renal function in volume-depleted patients, which may increase metformin exposure and the risk of lactic acidosis.
How serious is the interaction between Metformin-sitagliptin and Methyclothiazide?
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 renal function after starting or changing the thiazide dose, and adjust antidiabetic therapy as needed.
What other medicines interact with Metformin-sitagliptin?
MediHelp also lists interactions of Metformin-sitagliptin with, for example, Clozapine, Contrast media, Diatrizoate meglumine / diatrizoate. The full list is on the Metformin-sitagliptin page.
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