Drug interactions
Amiodarone + Moxifloxacin
Severity: Contraindicated
Amiodarone and Moxifloxacin: contraindicated 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 agents prolong the QT interval, and the combination markedly increases the risk of torsades de pointes. Amiodarone's long half-life means the risk persists after it is stopped.
What this interaction means in plain words
Amiodarone and Moxifloxacin are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Amiodarone belongs to Cardiovascular; Moxifloxacin belongs to Anti Bacterial.
Why it happens
Additive blockade of cardiac potassium channels (IKr) resulting in delayed repolarization.
What to do
Avoid the combination and choose a non-QT-prolonging antibiotic. If it cannot be avoided, monitor ECG closely and keep potassium and magnesium within normal range.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Moxifloxacin
- Arsenic trioxide + Moxifloxacin Contraindicated
- Disopyramide + Moxifloxacin Contraindicated
- Dofetilide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin Contraindicated
- Ibutilide + Moxifloxacin 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 Moxifloxacin?
MediHelp rates the interaction as contraindicated. Amiodarone and Moxifloxacin are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Both agents prolong the QT interval, and the combination markedly increases the risk of torsades de pointes. Amiodarone's long half-life means the risk persists after it is stopped.
How serious is the interaction between Amiodarone and Moxifloxacin?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and choose a non-QT-prolonging antibiotic. If it cannot be avoided, monitor ECG closely and keep potassium and magnesium within normal range.
What other medicines interact with Moxifloxacin?
MediHelp also lists interactions of Moxifloxacin with, for example, Arsenic trioxide, Disopyramide, Dofetilide. The full list is on the Moxifloxacin page.
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