Drug interactions
Dexamethasone + Gefitinib
Severity: Moderate
Dexamethasone and Gefitinib: 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 lower gefitinib exposure, potentially reducing antitumor efficacy. The effect is less than with strong inducers such as rifampicin.
What this interaction means in plain words
Dexamethasone and Gefitinib 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; Gefitinib belongs to Oncology.
Why it happens
Dexamethasone induces CYP3A4, increasing gefitinib metabolism.
What to do
Monitor tumor response and consider whether alternative corticosteroid dosing is possible. A gefitinib dose increase is reserved for strong inducers and should be considered case by case.
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 Gefitinib
Frequently asked questions
Can I take Dexamethasone with Gefitinib?
MediHelp rates the interaction as moderate. Dexamethasone and Gefitinib 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 lower gefitinib exposure, potentially reducing antitumor efficacy. The effect is less than with strong inducers such as rifampicin.
How serious is the interaction between Dexamethasone and Gefitinib?
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 tumor response and consider whether alternative corticosteroid dosing is possible. A gefitinib dose increase is reserved for strong inducers and should be considered case by case.
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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