Drug interactions
Dexamethasone + Tamoxifen
Severity: Minor
Dexamethasone and Tamoxifen: minor 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
Tamoxifen is metabolized by CYP3A4 and CYP2D6 to active metabolites, and dexamethasone may induce CYP3A4. Tamoxifen exposure may be modestly reduced, but the clinical significance is uncertain.
What this interaction means in plain words
Dexamethasone and Tamoxifen have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Dexamethasone belongs to Endocrine; Tamoxifen belongs to Endocrine.
Why it happens
Dexamethasone induces CYP3A4, potentially increasing tamoxifen clearance.
What to do
No routine adjustment is required; monitor for therapeutic response in patients on prolonged high-dose steroids.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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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 Tamoxifen
- Amiodarone + Tamoxifen Major
- Anastrozole + Tamoxifen Major
- Bupropion + Tamoxifen Major
- Carbamazepine + Tamoxifen Major
- Cinacalcet + Tamoxifen Major
- Dacomitinib + Tamoxifen Major
Frequently asked questions
Can I take Dexamethasone with Tamoxifen?
MediHelp rates the interaction as minor. Dexamethasone and Tamoxifen have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Tamoxifen is metabolized by CYP3A4 and CYP2D6 to active metabolites, and dexamethasone may induce CYP3A4. Tamoxifen exposure may be modestly reduced, but the clinical significance is uncertain.
How serious is the interaction between Dexamethasone and Tamoxifen?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine adjustment is required; monitor for therapeutic response in patients on prolonged high-dose steroids.
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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