Drug interactions
Moxifloxacin + Ranolazine
Severity: Major
Moxifloxacin and Ranolazine: 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
Ranolazine causes dose-related QT prolongation and moxifloxacin has a recognized QT effect, so together they may produce additive prolongation. This increases the risk of ventricular arrhythmias, particularly in patients with heart disease or electrolyte imbalance.
What this interaction means in plain words
Moxifloxacin and Ranolazine 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; Ranolazine belongs to Cardiovascular.
Why it happens
Additive pharmacodynamic prolongation of ventricular repolarization through potassium channel effects.
What to do
Prefer a non-QT-prolonging antibiotic. If co-administered, monitor the ECG 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 Moxifloxacin
- Amiodarone + Moxifloxacin Contraindicated
- Arsenic trioxide + Moxifloxacin Contraindicated
- Disopyramide + Moxifloxacin Contraindicated
- Dofetilide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin Contraindicated
Other interactions of Ranolazine
- Adagrasib + Ranolazine Contraindicated
- Amobarbital + Ranolazine Contraindicated
- Apalutamide + Ranolazine Contraindicated
- Butabarbital + Ranolazine Contraindicated
- Carbamazepine + Ranolazine Contraindicated
- Clarithromycin + Ranolazine Contraindicated
Frequently asked questions
Can I take Moxifloxacin with Ranolazine?
MediHelp rates the interaction as major. Moxifloxacin and Ranolazine 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. Ranolazine causes dose-related QT prolongation and moxifloxacin has a recognized QT effect, so together they may produce additive prolongation. This increases the risk of ventricular arrhythmias, particularly in patients with heart disease or electrolyte imbalance.
How serious is the interaction between Moxifloxacin and Ranolazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer a non-QT-prolonging antibiotic. If co-administered, monitor the ECG and keep potassium and magnesium within normal range.
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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