Drug interactions
Quinidine + Rifapentine
Severity: Major
Quinidine and Rifapentine: major 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 CYP3A4 and can significantly lower quinidine exposure, risking loss of antiarrhythmic or antimalarial effect. Induction may persist after rifapentine is stopped.
What this interaction means in plain words
Quinidine and Rifapentine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Quinidine belongs to Anti Parasitic; Rifapentine belongs to Anti Bacterial.
Why it happens
Rifapentine induces CYP3A4, accelerating quinidine metabolism.
What to do
Monitor quinidine levels and ECG and increase the dose if needed, or use an alternative antiarrhythmic. Re-adjust the quinidine dose after rifapentine is stopped.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Quinidine
- Adagrasib + Quinidine Contraindicated
- Arsenic trioxide + Quinidine Contraindicated
- Artemether / lumefantrine + Quinidine Contraindicated
- Chloroquine + Quinidine Contraindicated
- Dofetilide + Quinidine Contraindicated
- Dronedarone + Quinidine Contraindicated
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 Quinidine with Rifapentine?
MediHelp rates the interaction as major. Quinidine and Rifapentine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Rifapentine induces CYP3A4 and can significantly lower quinidine exposure, risking loss of antiarrhythmic or antimalarial effect. Induction may persist after rifapentine is stopped.
How serious is the interaction between Quinidine and Rifapentine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor quinidine levels and ECG and increase the dose if needed, or use an alternative antiarrhythmic. Re-adjust the quinidine dose after rifapentine is stopped.
What other medicines interact with Quinidine?
MediHelp also lists interactions of Quinidine with, for example, Adagrasib, Arsenic trioxide, Artemether / lumefantrine. The full list is on the Quinidine page.
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