Drug interactions
Moxifloxacin + Vorinostat
Severity: Major
Moxifloxacin and Vorinostat: major interaction.
Last updated Sources: Health Canada product monograph
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
Vorinostat has been associated with QT prolongation, and moxifloxacin also prolongs the QT interval. The combination may add to the risk of serious ventricular arrhythmia.
What this interaction means in plain words
Moxifloxacin and Vorinostat 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.
Moxifloxacin belongs to Anti Bacterial; Vorinostat belongs to Oncology.
Why it happens
Additive effects on cardiac repolarization.
What to do
Avoid the combination if an alternative antibiotic is suitable. Otherwise monitor ECG, potassium and magnesium regularly.
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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References
Other interactions of Moxifloxacin
- Amiodarone + Moxifloxacin Contraindicated
- Arsenic trioxide + Moxifloxacin Contraindicated
- Disopyramide + Moxifloxacin Contraindicated
- Dofetilide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin Contraindicated
Other interactions of Vorinostat
- Thioridazine + Vorinostat Contraindicated
- Amiodarone + Vorinostat Major
- Amisulpride + Vorinostat Major
- Anagrelide + Vorinostat Major
- Asenapine + Vorinostat Major
- Chlorpromazine + Vorinostat Major
Frequently asked questions
Can I take Moxifloxacin with Vorinostat?
MediHelp rates the interaction as major. Moxifloxacin and Vorinostat 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. Vorinostat has been associated with QT prolongation, and moxifloxacin also prolongs the QT interval. The combination may add to the risk of serious ventricular arrhythmia.
How serious is the interaction between Moxifloxacin and Vorinostat?
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 if an alternative antibiotic is suitable. Otherwise monitor ECG, potassium and magnesium regularly.
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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