Drug interactions
Dolasetron + Loperamide
Severity: Major
Dolasetron 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
Dolasetron's active metabolite prolongs QT and PR intervals, and loperamide may add to QT prolongation, particularly at high doses. This raises the risk of serious ventricular arrhythmia.
What this interaction means in plain words
Dolasetron 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.
Dolasetron belongs to Gastrointestinal Tract; Loperamide belongs to Gastrointestinal Tract.
Why it happens
Additive QT prolongation through cardiac ion channel blockade.
What to do
Avoid combining if possible, using other antidiarrheal approaches. If used together, monitor ECG and correct electrolytes.
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 Dolasetron
- Apomorphine + Dolasetron Contraindicated
- Dofetilide + Dolasetron Contraindicated
- Dolasetron + Ibutilide Contraindicated
- Dolasetron + Pimozide Contraindicated
- Dolasetron + Thioridazine Contraindicated
- Dolasetron + Vandetanib Contraindicated
Frequently asked questions
Can I take Dolasetron with Loperamide?
MediHelp rates the interaction as major. Dolasetron 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. Dolasetron's active metabolite prolongs QT and PR intervals, and loperamide may add to QT prolongation, particularly at high doses. This raises the risk of serious ventricular arrhythmia.
How serious is the interaction between Dolasetron 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 combining if possible, using other antidiarrheal approaches. If used together, monitor ECG and correct electrolytes.
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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