Drug interactions
Artemether / lumefantrine + Olanzapine
Severity: Major
Artemether / lumefantrine and Olanzapine: 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
Artemether/lumefantrine can prolong the QT interval, and its labeling warns against use with other QT-prolonging drugs. Olanzapine has been rarely associated with QT prolongation, so the combination may increase the arrhythmia risk.
What this interaction means in plain words
Artemether / lumefantrine and Olanzapine 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 pharmacodynamic QT prolongation.
What to do
Avoid if an alternative antimalarial or antipsychotic is available. If it is necessary, obtain an ECG, correct potassium and magnesium, and monitor for arrhythmia symptoms.
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 Olanzapine
Frequently asked questions
Can I take Artemether / lumefantrine with Olanzapine?
MediHelp rates the interaction as major. Artemether / lumefantrine and Olanzapine 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. Artemether/lumefantrine can prolong the QT interval, and its labeling warns against use with other QT-prolonging drugs. Olanzapine has been rarely associated with QT prolongation, so the combination may increase the arrhythmia risk.
How serious is the interaction between Artemether / lumefantrine and Olanzapine?
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 if an alternative antimalarial or antipsychotic is available. If it is necessary, obtain an ECG, correct potassium and magnesium, and monitor for arrhythmia symptoms.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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