Drug interactions
Iloperidone + Lapatinib
Severity: Major
Iloperidone and Lapatinib: 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 prolong the QT interval, and lapatinib inhibits CYP3A4, which helps clear iloperidone. Iloperidone's own weak CYP3A inhibition may also raise lapatinib levels, compounding QT risk.
What this interaction means in plain words
Iloperidone and Lapatinib 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.
Iloperidone belongs to Central Nervous System; Lapatinib belongs to Oncology.
Why it happens
Additive QT prolongation combined with CYP3A4 inhibition reducing iloperidone clearance.
What to do
Avoid the combination if possible; otherwise use ECG and electrolyte monitoring and consider reducing the iloperidone dose.
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 Lapatinib
- Dofetilide + Lapatinib Contraindicated
- Ibutilide + Lapatinib Contraindicated
- Lapatinib + Pimozide Contraindicated
- Lapatinib + Saquinavir Contraindicated
- Lapatinib + Thioridazine Contraindicated
- Adagrasib + Lapatinib Major
Other interactions of Iloperidone
- Iloperidone + Thioridazine Contraindicated
- Alfuzosin + Iloperidone Major
- Amiodarone + Iloperidone Major
- Amisulpride + Iloperidone Major
- Amitriptyline + Iloperidone Major
- Anagrelide + Iloperidone Major
Frequently asked questions
Can I take Iloperidone with Lapatinib?
MediHelp rates the interaction as major. Iloperidone and Lapatinib 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 prolong the QT interval, and lapatinib inhibits CYP3A4, which helps clear iloperidone. Iloperidone's own weak CYP3A inhibition may also raise lapatinib levels, compounding QT risk.
How serious is the interaction between Iloperidone and Lapatinib?
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 if possible; otherwise use ECG and electrolyte monitoring and consider reducing the iloperidone dose.
What other medicines interact with Lapatinib?
MediHelp also lists interactions of Lapatinib with, for example, Dofetilide, Ibutilide, Pimozide. The full list is on the Lapatinib page.
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