Drug interactions
Diazepam intranasal + Lapatinib
Severity: Moderate
Diazepam intranasal and Lapatinib: 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
Lapatinib inhibits CYP3A4, which contributes to diazepam metabolism, so diazepam exposure may increase. This may cause more sedation and CNS or respiratory depression.
What this interaction means in plain words
Diazepam intranasal and Lapatinib 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
Lapatinib inhibits CYP3A4, reducing diazepam clearance.
What to do
Monitor for excessive sedation and respiratory depression. Limit repeated intranasal dosing and consider dose reduction.
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 Lapatinib
- Dofetilide + Lapatinib Contraindicated
- Ibutilide + Lapatinib Contraindicated
- Lapatinib + Pimozide Contraindicated
- Lapatinib + Saquinavir Contraindicated
- Lapatinib + Thioridazine Contraindicated
- Adagrasib + Lapatinib Major
Frequently asked questions
Can I take Diazepam intranasal with Lapatinib?
MediHelp rates the interaction as moderate. Diazepam intranasal and Lapatinib 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. Lapatinib inhibits CYP3A4, which contributes to diazepam metabolism, so diazepam exposure may increase. This may cause more sedation and CNS or respiratory depression.
How serious is the interaction between Diazepam intranasal and Lapatinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for excessive sedation and respiratory depression. Limit repeated intranasal dosing and consider dose reduction.
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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