Drug interactions
Amiodarone + Posaconazole
Severity: Major
Amiodarone and Posaconazole: 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
Both drugs prolong the QT interval, and amiodarone has a long half-life so its effect persists. Combined use raises the risk of torsades de pointes, and posaconazole may also modestly raise amiodarone levels through CYP3A4 inhibition.
What this interaction means in plain words
Amiodarone and Posaconazole 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.
Amiodarone belongs to Cardiovascular; Posaconazole belongs to Anti Fungals.
Why it happens
Additive QT prolongation, with possible CYP3A4 inhibition by posaconazole increasing amiodarone exposure.
What to do
Avoid the combination when an alternative exists. If needed, monitor ECG QTc and keep potassium and magnesium within normal range.
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 Posaconazole
- Artemether + Posaconazole Contraindicated
- Avanafil + Posaconazole Contraindicated
- Cobimetinib + Posaconazole Contraindicated
- Conivaptan + Posaconazole Contraindicated
- Dihydroergotamine intranasal + Posaconazole Contraindicated
- Dihydroergotamine + Posaconazole Contraindicated
Other interactions of Amiodarone
- Amiodarone + Amisulpride Contraindicated
- Amiodarone + Arsenic trioxide Contraindicated
- Amiodarone + Dofetilide Contraindicated
- Amiodarone + Dronedarone Contraindicated
- Amiodarone + Droperidol Contraindicated
- Amiodarone + Eliglustat Contraindicated
Frequently asked questions
Can I take Amiodarone with Posaconazole?
MediHelp rates the interaction as major. Amiodarone and Posaconazole 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. Both drugs prolong the QT interval, and amiodarone has a long half-life so its effect persists. Combined use raises the risk of torsades de pointes, and posaconazole may also modestly raise amiodarone levels through CYP3A4 inhibition.
How serious is the interaction between Amiodarone and Posaconazole?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination when an alternative exists. If needed, monitor ECG QTc and keep potassium and magnesium within normal range.
What other medicines interact with Posaconazole?
MediHelp also lists interactions of Posaconazole with, for example, Artemether, Avanafil, Cobimetinib. The full list is on the Posaconazole page.
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