Drug interactions
Hydrochlorothiazide-valsartan + Metformin
Severity: Minor
Hydrochlorothiazide-valsartan and Metformin: 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, especially at higher doses, which may reduce the glucose-lowering effect of metformin. Glycemic control may worsen after hydrochlorothiazide is started or increased.
What this interaction means in plain words
Hydrochlorothiazide-valsartan and Metformin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Hydrochlorothiazide-valsartan belongs to Cardiovascular; Metformin belongs to Endocrine.
Why it happens
Thiazides impair insulin secretion and peripheral glucose utilization through hypokalemia and other effects, opposing antidiabetic action.
What to do
Monitor blood glucose and HbA1c after starting or adjusting the thiazide, and increase antidiabetic therapy if control deteriorates.
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 Hydrochlorothiazide-valsartan
- Aliskiren + Hydrochlorothiazide-valsartan Contraindicated
- Dofetilide + Hydrochlorothiazide-valsartan Contraindicated
- Hydrochlorothiazide-valsartan + Sparsentan Contraindicated
- Aldesleukin + Hydrochlorothiazide-valsartan Major
- Amifostine + Hydrochlorothiazide-valsartan Major
- Amiloride + Hydrochlorothiazide-valsartan Major
Other interactions of Metformin
Frequently asked questions
Can I take Hydrochlorothiazide-valsartan with Metformin?
MediHelp rates the interaction as minor. Hydrochlorothiazide-valsartan and Metformin 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, especially at higher doses, which may reduce the glucose-lowering effect of metformin. Glycemic control may worsen after hydrochlorothiazide is started or increased.
How serious is the interaction between Hydrochlorothiazide-valsartan and Metformin?
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 HbA1c after starting or adjusting the thiazide, and increase antidiabetic therapy if control deteriorates.
What other medicines interact with Hydrochlorothiazide-valsartan?
MediHelp also lists interactions of Hydrochlorothiazide-valsartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Hydrochlorothiazide-valsartan page.
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