Drug interactions
Gemtuzumab + Olanzapine
Severity: Moderate
Gemtuzumab and Olanzapine: moderate 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
Gemtuzumab ozogamicin has been associated with QT prolongation, and olanzapine has a small QT effect. The combination may modestly increase arrhythmia risk, particularly with electrolyte disturbances or other QT-prolonging drugs.
What this interaction means in plain words
Gemtuzumab and Olanzapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Potential additive QT prolongation.
What to do
Check ECG and electrolytes at baseline and during treatment, correcting potassium and magnesium. Avoid adding further QT-prolonging drugs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Olanzapine
Frequently asked questions
Can I take Gemtuzumab with Olanzapine?
MediHelp rates the interaction as moderate. Gemtuzumab and Olanzapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Gemtuzumab ozogamicin has been associated with QT prolongation, and olanzapine has a small QT effect. The combination may modestly increase arrhythmia risk, particularly with electrolyte disturbances or other QT-prolonging drugs.
How serious is the interaction between Gemtuzumab and Olanzapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check ECG and electrolytes at baseline and during treatment, correcting potassium and magnesium. Avoid adding further QT-prolonging drugs.
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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