Drug interactions
Fexinidazole + Loperamide
Severity: Major
Fexinidazole 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
Both drugs can prolong the QT interval, and fexinidazole inhibits CYP3A4, which can raise loperamide exposure. Higher loperamide levels increase the risk of QT prolongation and serious ventricular arrhythmias such as torsades de pointes.
What this interaction means in plain words
Fexinidazole 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.
Why it happens
Additive QT prolongation combined with CYP3A4 inhibition by fexinidazole reducing loperamide metabolism.
What to do
Avoid the combination and use a non-QT-prolonging antidiarrheal approach during fexinidazole therapy. If unavoidable, obtain a baseline ECG and correct potassium and magnesium.
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
Frequently asked questions
Can I take Fexinidazole with Loperamide?
MediHelp rates the interaction as major. Fexinidazole 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. Both drugs can prolong the QT interval, and fexinidazole inhibits CYP3A4, which can raise loperamide exposure. Higher loperamide levels increase the risk of QT prolongation and serious ventricular arrhythmias such as torsades de pointes.
How serious is the interaction between Fexinidazole 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 the combination and use a non-QT-prolonging antidiarrheal approach during fexinidazole therapy. If unavoidable, obtain a baseline ECG and correct potassium and magnesium.
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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