Drug interactions
Avapritinib + Chloramphenicol
Severity: Major
Avapritinib and Chloramphenicol: 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
Avapritinib is a CYP3A4 substrate and its exposure increases with CYP3A4 inhibitors, raising the risk of cognitive effects, intracranial bleeding and other toxicity. Chloramphenicol is a CYP3A4 inhibitor, though likely weaker than strong inhibitors.
What this interaction means in plain words
Avapritinib and Chloramphenicol 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.
Avapritinib belongs to Oncology; Chloramphenicol belongs to Anti Bacterial.
Why it happens
Inhibition of CYP3A4-mediated metabolism of avapritinib.
What to do
Avoid the combination and choose another antibiotic. If necessary, monitor for cognitive changes, bleeding and other adverse effects, and consider avapritinib dose reduction.
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 Chloramphenicol
Other interactions of Avapritinib
Frequently asked questions
Can I take Avapritinib with Chloramphenicol?
MediHelp rates the interaction as major. Avapritinib and Chloramphenicol 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. Avapritinib is a CYP3A4 substrate and its exposure increases with CYP3A4 inhibitors, raising the risk of cognitive effects, intracranial bleeding and other toxicity. Chloramphenicol is a CYP3A4 inhibitor, though likely weaker than strong inhibitors.
How serious is the interaction between Avapritinib and Chloramphenicol?
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 and choose another antibiotic. If necessary, monitor for cognitive changes, bleeding and other adverse effects, and consider avapritinib dose reduction.
What other medicines interact with Chloramphenicol?
MediHelp also lists interactions of Chloramphenicol with, for example, Adagrasib, Bcg vaccine live, Benzhydrocodone / acetaminophen. The full list is on the Chloramphenicol page.
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