Drug interactions
Metformin-pioglitazone + Rifapentine
Severity: Moderate
Metformin-pioglitazone and Rifapentine: 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
Rifapentine induces CYP enzymes including CYP2C8 and CYP3A4, which can lower pioglitazone concentrations and weaken glycemic control. Rifampin, a related drug, has been shown to reduce pioglitazone exposure substantially.
What this interaction means in plain words
Metformin-pioglitazone and Rifapentine 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.
Metformin-pioglitazone belongs to Endocrine; Rifapentine belongs to Anti Bacterial.
Why it happens
Induction of CYP2C8 and CYP3A4 increases pioglitazone metabolism.
What to do
Monitor blood glucose and HbA1c during and after rifapentine therapy and increase the antidiabetic dose if needed. Reassess the dose when rifapentine is stopped.
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-pioglitazone
Other interactions of Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Metformin-pioglitazone with Rifapentine?
MediHelp rates the interaction as moderate. Metformin-pioglitazone and Rifapentine 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. Rifapentine induces CYP enzymes including CYP2C8 and CYP3A4, which can lower pioglitazone concentrations and weaken glycemic control. Rifampin, a related drug, has been shown to reduce pioglitazone exposure substantially.
How serious is the interaction between Metformin-pioglitazone and Rifapentine?
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 HbA1c during and after rifapentine therapy and increase the antidiabetic dose if needed. Reassess the dose when rifapentine is stopped.
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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