Drug interactions
Grapefruit + Metformin-pioglitazone
Severity: Minor
Grapefruit 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
Grapefruit juice can inhibit intestinal CYP3A4 and may modestly raise pioglitazone exposure. Pioglitazone is metabolized mainly by CYP2C8 with a smaller CYP3A4 contribution, so the effect is usually small. Increased adverse effects such as fluid retention or hypoglycemia are possible but unlikely.
What this interaction means in plain words
Grapefruit 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
Inhibition of intestinal CYP3A4 by grapefruit constituents slightly reduces first-pass metabolism of pioglitazone.
What to do
No dose change is usually needed; monitor blood glucose and for edema if the patient consumes large amounts of grapefruit juice regularly.
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 Grapefruit with Metformin-pioglitazone?
MediHelp rates the interaction as minor. Grapefruit 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. Grapefruit juice can inhibit intestinal CYP3A4 and may modestly raise pioglitazone exposure. Pioglitazone is metabolized mainly by CYP2C8 with a smaller CYP3A4 contribution, so the effect is usually small. Increased adverse effects such as fluid retention or hypoglycemia are possible but unlikely.
How serious is the interaction between Grapefruit 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: No dose change is usually needed; monitor blood glucose and for edema if the patient consumes large amounts of grapefruit juice regularly.
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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