Drug interactions
Gepirone + Lapatinib
Severity: Major
Gepirone 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 agents can prolong the QTc interval, so the combination may increase arrhythmia risk. Gepirone is also a CYP3A4 substrate, and lapatinib may raise its levels.
What this interaction means in plain words
Gepirone 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.
Gepirone belongs to Central Nervous System; Lapatinib belongs to Oncology.
Why it happens
Additive QT prolongation, with possible CYP3A4 inhibition by lapatinib raising gepirone exposure.
What to do
Avoid if possible, or obtain a baseline ECG and monitor with electrolyte correction. Limit the gepirone dose as labeled for CYP3A4 inhibitors.
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 Gepirone
- Clarithromycin + Gepirone Contraindicated
- Gepirone + Isocarboxazid Contraindicated
- Gepirone + Itraconazole Contraindicated
- Gepirone + Ketoconazole Contraindicated
- Gepirone + Linezolid Contraindicated
- Gepirone + Phenelzine Contraindicated
Frequently asked questions
Can I take Gepirone with Lapatinib?
MediHelp rates the interaction as major. Gepirone 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 agents can prolong the QTc interval, so the combination may increase arrhythmia risk. Gepirone is also a CYP3A4 substrate, and lapatinib may raise its levels.
How serious is the interaction between Gepirone 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 if possible, or obtain a baseline ECG and monitor with electrolyte correction. Limit the gepirone dose as labeled for CYP3A4 inhibitors.
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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