Drug interactions
Ceritinib + Pimavanserin
Severity: Major
Ceritinib and Pimavanserin: major interaction.
Last updated Sources: US FDA label
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
Ceritinib prolongs the QT interval and inhibits CYP3A4, the main enzyme that clears pimavanserin. Pimavanserin levels may therefore rise, increasing its own QT effect on top of the additive effect of ceritinib.
What this interaction means in plain words
Ceritinib and Pimavanserin 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.
Ceritinib belongs to Oncology; Pimavanserin belongs to Central Nervous System.
Why it happens
Additive QT prolongation plus CYP3A4 inhibition by ceritinib, which reduces pimavanserin clearance.
What to do
Avoid the combination where possible. If it is unavoidable, reduce the pimavanserin dose, monitor ECG and electrolytes, and watch 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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References
Other interactions of Pimavanserin
- Lefamulin + Pimavanserin Contraindicated
- Pimavanserin + Pimozide Contraindicated
- Pimavanserin + Vandetanib Contraindicated
- Adagrasib + Pimavanserin Major
- Amiodarone + Pimavanserin Major
- Amisulpride + Pimavanserin Major
Other interactions of Ceritinib
- Ceritinib + Cisapride Contraindicated
- Ceritinib + Eletriptan Contraindicated
- Ceritinib + Flibanserin Contraindicated
- Ceritinib + Pimozide Contraindicated
- Ceritinib + Thioridazine Contraindicated
- Ceritinib + Tolvaptan Contraindicated
Frequently asked questions
Can I take Ceritinib with Pimavanserin?
MediHelp rates the interaction as major. Ceritinib and Pimavanserin 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. Ceritinib prolongs the QT interval and inhibits CYP3A4, the main enzyme that clears pimavanserin. Pimavanserin levels may therefore rise, increasing its own QT effect on top of the additive effect of ceritinib.
How serious is the interaction between Ceritinib and Pimavanserin?
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 where possible. If it is unavoidable, reduce the pimavanserin dose, monitor ECG and electrolytes, and watch for arrhythmia symptoms.
What other medicines interact with Pimavanserin?
MediHelp also lists interactions of Pimavanserin with, for example, Lefamulin, Pimozide, Vandetanib. The full list is on the Pimavanserin page.
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