Drug interactions
Dronedarone + Nafcillin
Severity: Major
Dronedarone and Nafcillin: major interaction.
Last updated Sources: US FDA label
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
Nafcillin is a CYP3A4 inducer and may lower dronedarone exposure, potentially reducing its antiarrhythmic effect. Dronedarone labeling advises against combining it with potent CYP3A inducers.
What this interaction means in plain words
Dronedarone and Nafcillin 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
Induction of CYP3A4 increases dronedarone metabolism and lowers plasma concentrations.
What to do
Avoid the combination and choose a non-inducing antibiotic such as a cephalosporin where suitable. If nafcillin is essential, monitor rhythm control closely.
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 Dronedarone
- Adagrasib + Dronedarone Contraindicated
- Amiodarone + Dronedarone Contraindicated
- Arsenic trioxide + Dronedarone Contraindicated
- Artemether / lumefantrine + Dronedarone Contraindicated
- Atazanavir + Dronedarone Contraindicated
- Azithromycin + Dronedarone Contraindicated
Frequently asked questions
Can I take Dronedarone with Nafcillin?
MediHelp rates the interaction as major. Dronedarone and Nafcillin 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. Nafcillin is a CYP3A4 inducer and may lower dronedarone exposure, potentially reducing its antiarrhythmic effect. Dronedarone labeling advises against combining it with potent CYP3A inducers.
How serious is the interaction between Dronedarone and Nafcillin?
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 choose a non-inducing antibiotic such as a cephalosporin where suitable. If nafcillin is essential, monitor rhythm control closely.
What other medicines interact with Dronedarone?
MediHelp also lists interactions of Dronedarone with, for example, Adagrasib, Amiodarone, Arsenic trioxide. The full list is on the Dronedarone page.
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