Drug interactions
Dienogest / estradiol valerate + Metformin-pioglitazone
Severity: Minor
Dienogest / estradiol valerate and Metformin-pioglitazone: 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
Pioglitazone has been reported to modestly lower exposure to some oral contraceptive hormones, though the clinical relevance for contraceptive efficacy is uncertain. Estrogen-containing products can also impair glucose tolerance and may slightly weaken the glucose-lowering effect of metformin and pioglitazone.
What this interaction means in plain words
Dienogest / estradiol valerate and Metformin-pioglitazone 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
Possible weak induction of estrogen metabolism by pioglitazone, plus estrogen-related reduction in insulin sensitivity opposing antidiabetic effects.
What to do
Monitor blood glucose when starting or stopping the contraceptive and adjust antidiabetic therapy if control changes. Counsel the patient to report breakthrough bleeding, which may signal reduced hormonal exposure.
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-pioglitazone
Frequently asked questions
Can I take Dienogest / estradiol valerate with Metformin-pioglitazone?
MediHelp rates the interaction as minor. Dienogest / estradiol valerate and Metformin-pioglitazone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Pioglitazone has been reported to modestly lower exposure to some oral contraceptive hormones, though the clinical relevance for contraceptive efficacy is uncertain. Estrogen-containing products can also impair glucose tolerance and may slightly weaken the glucose-lowering effect of metformin and pioglitazone.
How serious is the interaction between Dienogest / estradiol valerate and Metformin-pioglitazone?
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 when starting or stopping the contraceptive and adjust antidiabetic therapy if control changes. Counsel the patient to report breakthrough bleeding, which may signal reduced hormonal exposure.
What other medicines interact with Metformin-pioglitazone?
MediHelp also lists interactions of Metformin-pioglitazone with, for example, Contrast media, Diatrizoate meglumine / diatrizoate, Diatrizoate. The full list is on the Metformin-pioglitazone page.
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