Drug interactions
Olanzapine + Paliperidone
Severity: Moderate
Olanzapine and Paliperidone: 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
Both antipsychotics can prolong the QT interval, and combining them adds to the risk of arrhythmia as well as to extrapyramidal and metabolic effects. Paliperidone has a more recognised QT effect than olanzapine.
What this interaction means in plain words
Olanzapine and Paliperidone 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.
Olanzapine belongs to Central Nervous System; Paliperidone belongs to Central Nervous System.
Why it happens
Additive QT prolongation through hERG blockade, plus additive dopamine and other receptor blockade.
What to do
Avoid antipsychotic polypharmacy where possible. If combined, obtain ECG and monitor electrolytes and adverse effects.
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
Other interactions of Paliperidone
- Ibutilide + Paliperidone Contraindicated
- Paliperidone + Pimozide Contraindicated
- Paliperidone + Vandetanib Contraindicated
- Adagrasib + Paliperidone Major
- Amiodarone + Paliperidone Major
- Amisulpride + Paliperidone Major
Frequently asked questions
Can I take Olanzapine with Paliperidone?
MediHelp rates the interaction as moderate. Olanzapine and Paliperidone 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. Both antipsychotics can prolong the QT interval, and combining them adds to the risk of arrhythmia as well as to extrapyramidal and metabolic effects. Paliperidone has a more recognised QT effect than olanzapine.
How serious is the interaction between Olanzapine and Paliperidone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid antipsychotic polypharmacy where possible. If combined, obtain ECG and monitor electrolytes and adverse effects.
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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