Drug interactions
Dexamethasone + Osimertinib
Severity: Moderate
Dexamethasone and Osimertinib: 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
Dexamethasone may induce CYP3A4 and reduce osimertinib exposure, potentially compromising tumor control. Strong inducers are known to substantially lower osimertinib levels, while dexamethasone is a weaker inducer.
What this interaction means in plain words
Dexamethasone and Osimertinib 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.
Dexamethasone belongs to Endocrine; Osimertinib belongs to Oncology.
Why it happens
Dexamethasone induces CYP3A4, increasing osimertinib metabolism.
What to do
Use the lowest effective dexamethasone dose, such as for brain metastasis edema, and monitor response; avoid strong inducers like rifampin.
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 Dexamethasone
- Bcg vaccine live + Dexamethasone Contraindicated
- Dexamethasone + Mifepristone Contraindicated
- Dexamethasone + Rilpivirine Contraindicated
- Dexamethasone + Smallpox vaccine live Contraindicated
- Dexamethasone + Varicella virus vaccine live Contraindicated
- Dexamethasone + Yellow fever vaccine Contraindicated
Other interactions of Osimertinib
Frequently asked questions
Can I take Dexamethasone with Osimertinib?
MediHelp rates the interaction as moderate. Dexamethasone and Osimertinib 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. Dexamethasone may induce CYP3A4 and reduce osimertinib exposure, potentially compromising tumor control. Strong inducers are known to substantially lower osimertinib levels, while dexamethasone is a weaker inducer.
How serious is the interaction between Dexamethasone and Osimertinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective dexamethasone dose, such as for brain metastasis edema, and monitor response; avoid strong inducers like rifampin.
What other medicines interact with Dexamethasone?
MediHelp also lists interactions of Dexamethasone with, for example, Bcg vaccine live, Mifepristone, Rilpivirine. The full list is on the Dexamethasone page.
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