Drug interactions
Dronedarone + Loperamide
Severity: Major
Dronedarone and Loperamide: 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
Dronedarone inhibits P-glycoprotein and CYP3A4, which may raise loperamide exposure, and it prolongs QT itself. The combination increases the risk of arrhythmia.
What this interaction means in plain words
Dronedarone and Loperamide 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; Loperamide belongs to Gastrointestinal Tract.
Why it happens
P-gp and CYP3A4 inhibition raises loperamide levels, with additive QT prolongation.
What to do
Avoid combination where possible and never exceed labeled loperamide doses. Monitor ECG if concurrent use is unavoidable.
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 Loperamide
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 Loperamide?
MediHelp rates the interaction as major. Dronedarone and Loperamide 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 inhibits P-glycoprotein and CYP3A4, which may raise loperamide exposure, and it prolongs QT itself. The combination increases the risk of arrhythmia.
How serious is the interaction between Dronedarone and Loperamide?
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 combination where possible and never exceed labeled loperamide doses. Monitor ECG if concurrent use is unavoidable.
What other medicines interact with Loperamide?
MediHelp also lists interactions of Loperamide with, for example, Amiodarone, Amisulpride, Anagrelide. The full list is on the Loperamide page.
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