Drug interactions
Buspirone + Lonafarnib
Severity: Major
Buspirone and Lonafarnib: 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
Lonafarnib is a strong CYP3A inhibitor and can substantially raise exposure to buspirone, a sensitive CYP3A substrate. This may cause excessive sedation, dizziness and nausea.
What this interaction means in plain words
Buspirone and Lonafarnib 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.
Buspirone belongs to Central Nervous System; Lonafarnib belongs to Miscellaneous.
Why it happens
Lonafarnib inhibits CYP3A4, reducing buspirone clearance.
What to do
Avoid if possible; otherwise reduce the buspirone dose and titrate carefully. Monitor for CNS depression and serotonergic adverse effects.
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 Buspirone
- Buspirone + Isocarboxazid Contraindicated
- Buspirone + Linezolid Contraindicated
- Buspirone + Phenelzine Contraindicated
- Buspirone + Procarbazine Contraindicated
- Buspirone + Selegiline Contraindicated
- Buspirone + Selegiline transdermal 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 Buspirone with Lonafarnib?
MediHelp rates the interaction as major. Buspirone and Lonafarnib 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. Lonafarnib is a strong CYP3A inhibitor and can substantially raise exposure to buspirone, a sensitive CYP3A substrate. This may cause excessive sedation, dizziness and nausea.
How serious is the interaction between Buspirone and Lonafarnib?
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; otherwise reduce the buspirone dose and titrate carefully. Monitor for CNS depression and serotonergic adverse effects.
What other medicines interact with Buspirone?
MediHelp also lists interactions of Buspirone with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Buspirone page.
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