Drug interactions
Dofetilide + Moxifloxacin
Severity: Contraindicated
Dofetilide 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
Dofetilide is a potent QT-prolonging antiarrhythmic with a high risk of torsades de pointes, and moxifloxacin adds further QT prolongation. The combination is dangerous and should not be used.
What this interaction means in plain words
Dofetilide 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.
Dofetilide belongs to Cardiovascular; Moxifloxacin belongs to Anti Bacterial.
Why it happens
Additive pharmacodynamic QT prolongation.
What to do
Avoid the combination and use a non-QT-prolonging antibiotic. Dofetilide patients need continuous ECG monitoring at initiation and electrolyte correction.
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
- Amiodarone + Moxifloxacin Contraindicated
- Arsenic trioxide + Moxifloxacin Contraindicated
- Disopyramide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin Contraindicated
- Ibutilide + Moxifloxacin Contraindicated
Other interactions of Dofetilide
- Amiodarone + Dofetilide Contraindicated
- Amisulpride + Dofetilide Contraindicated
- Amlodipine-hydrochlorothiazide-valsartan + Dofetilide Contraindicated
- Amlodipine-olmesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Candesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Captopril-hydrochlorothiazide + Dofetilide Contraindicated
Frequently asked questions
Can I take Dofetilide with Moxifloxacin?
MediHelp rates the interaction as contraindicated. Dofetilide 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. Dofetilide is a potent QT-prolonging antiarrhythmic with a high risk of torsades de pointes, and moxifloxacin adds further QT prolongation. The combination is dangerous and should not be used.
How serious is the interaction between Dofetilide 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 use a non-QT-prolonging antibiotic. Dofetilide patients need continuous ECG monitoring at initiation and electrolyte correction.
What other medicines interact with Moxifloxacin?
MediHelp also lists interactions of Moxifloxacin with, for example, Amiodarone, Arsenic trioxide, Disopyramide. The full list is on the Moxifloxacin page.
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