Drug interactions
amiodarone + levofloxacin
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.
Overview
Additive QT prolongation increasing risk of torsades de pointes and ventricular arrhythmias when a fluoroquinolone is used with a class III antiarrhythmic.
Mechanism of action
Pharmacodynamic: both prolong cardiac repolarization (QTc) via IKr blockade, leading to additive QT prolongation.
Clinical management
Avoid combination if possible; use a non–QT-prolonging antibiotic. If necessary: obtain baseline and follow-up ECGs, correct K/Mg, avoid other QT-prolongers, monitor for syncope/palpitations; adjust levofloxacin for renal function.
Drug reference
Frequently asked questions
Can I take amiodarone with levofloxacin?
The interaction is rated: Major. Additive QT prolongation increasing risk of torsades de pointes and ventricular arrhythmias when a fluoroquinolone is used with a class III antiarrhythmic.
How serious is the interaction between amiodarone and levofloxacin?
The interaction is rated: Major. Evidence level: High.
How is the interaction between amiodarone and levofloxacin managed?
Avoid combination if possible; use a non–QT-prolonging antibiotic. If necessary: obtain baseline and follow-up ECGs, correct K/Mg, avoid other QT-prolongers, monitor for syncope/palpitations; adjust levofloxacin for renal function.
Why do amiodarone and levofloxacin interact?
Pharmacodynamic: both prolong cardiac repolarization (QTc) via IKr blockade, leading to additive QT prolongation.
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