Drug interactions
Itraconazole + Lonafarnib
Severity: Contraindicated
Itraconazole and Lonafarnib: contraindicated 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
Lonafarnib is a sensitive CYP3A4 substrate and itraconazole strongly increases its exposure. This raises toxicity such as gastrointestinal effects, hepatotoxicity and QT prolongation.
What this interaction means in plain words
Itraconazole and Lonafarnib are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Itraconazole belongs to Anti Fungals; Lonafarnib belongs to Miscellaneous.
Why it happens
Strong CYP3A4 inhibition by itraconazole reduces lonafarnib clearance.
What to do
Do not use together. Choose an antifungal without CYP3A4 inhibition.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Itraconazole
- Alfuzosin + Itraconazole Contraindicated
- Alprazolam + Itraconazole Contraindicated
- Avanafil + Itraconazole Contraindicated
- Conivaptan + Itraconazole Contraindicated
- Dihydroergotamine intranasal + Itraconazole Contraindicated
- Dihydroergotamine + Itraconazole Contraindicated
Other interactions of Lonafarnib
- Alfuzosin + Lonafarnib Contraindicated
- Amobarbital + Lonafarnib Contraindicated
- Apalutamide + Lonafarnib Contraindicated
- Bosentan + Lonafarnib Contraindicated
- Carbamazepine + Lonafarnib Contraindicated
- Clarithromycin + Lonafarnib Contraindicated
Frequently asked questions
Can I take Itraconazole with Lonafarnib?
MediHelp rates the interaction as contraindicated. Itraconazole and Lonafarnib are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Lonafarnib is a sensitive CYP3A4 substrate and itraconazole strongly increases its exposure. This raises toxicity such as gastrointestinal effects, hepatotoxicity and QT prolongation.
How serious is the interaction between Itraconazole and Lonafarnib?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not use together. Choose an antifungal without CYP3A4 inhibition.
What other medicines interact with Itraconazole?
MediHelp also lists interactions of Itraconazole with, for example, Alfuzosin, Alprazolam, Avanafil. The full list is on the Itraconazole page.
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