Drug interactions
Levofloxacin + Procainamide
Severity: Major
Levofloxacin and Procainamide: 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
Procainamide is a class IA antiarrhythmic that prolongs QT and can cause torsades de pointes. Levofloxacin adds further repolarization delay and raises the risk of ventricular arrhythmia.
What this interaction means in plain words
Levofloxacin and Procainamide 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.
Why it happens
Additive QT interval prolongation through potassium channel blockade.
What to do
Avoid the combination and select a non-QT-prolonging antibiotic. If unavoidable, monitor ECG and electrolytes and consider procainamide levels.
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 Levofloxacin
- Dronedarone + Levofloxacin Contraindicated
- Ibutilide + Levofloxacin Contraindicated
- Levofloxacin + Thioridazine Contraindicated
- Levofloxacin + Vandetanib Contraindicated
- Levofloxacin + Ziprasidone Contraindicated
- Adagrasib + Levofloxacin Major
Frequently asked questions
Can I take Levofloxacin with Procainamide?
MediHelp rates the interaction as major. Levofloxacin and Procainamide 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. Procainamide is a class IA antiarrhythmic that prolongs QT and can cause torsades de pointes. Levofloxacin adds further repolarization delay and raises the risk of ventricular arrhythmia.
How serious is the interaction between Levofloxacin and Procainamide?
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 and select a non-QT-prolonging antibiotic. If unavoidable, monitor ECG and electrolytes and consider procainamide levels.
What other medicines interact with Levofloxacin?
MediHelp also lists interactions of Levofloxacin with, for example, Dronedarone, Ibutilide, Thioridazine. The full list is on the Levofloxacin page.
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