Drug interactions
Dronedarone + Promethazine
Severity: Major
Dronedarone and Promethazine: 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
The concurrent use of promethazine and dronedarone can lead to a significant prolongation of the QTc interval, which may increase the risk of serious cardiac arrhythmias. Patients taking both medications should be closely monitored for any signs of cardiac disturbances.
What this interaction means in plain words
Dronedarone and Promethazine 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.
Dronedarone belongs to Cardiovascular; Promethazine belongs to Respiratory.
Why it happens
Both drugs are known to affect cardiac repolarization, leading to an increased risk of QTc prolongation. This interaction may result from their individual effects on ion channels involved in cardiac rhythm.
What to do
It is advisable to avoid co-administration of these two drugs whenever possible. If their use together is deemed necessary, continuous cardiac monitoring should be implemented to detect any potential arrhythmias early.
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 Promethazine
- Cabergoline + Promethazine Contraindicated
- Dopamine + Promethazine Contraindicated
- Ibutilide + Promethazine Contraindicated
- Pimozide + Promethazine Contraindicated
- Promethazine + Thioridazine Contraindicated
- Alfentanil + Promethazine Major
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 Promethazine?
MediHelp rates the interaction as major. Dronedarone and Promethazine 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. The concurrent use of promethazine and dronedarone can lead to a significant prolongation of the QTc interval, which may increase the risk of serious cardiac arrhythmias. Patients taking both medications should be closely monitored for any signs of cardiac disturbances.
How serious is the interaction between Dronedarone and Promethazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: It is advisable to avoid co-administration of these two drugs whenever possible. If their use together is deemed necessary, continuous cardiac monitoring should be implemented to detect any potential arrhythmias early.
What other medicines interact with Promethazine?
MediHelp also lists interactions of Promethazine with, for example, Cabergoline, Dopamine, Ibutilide. The full list is on the Promethazine page.
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