Drug interactions
Dexamethasone + Mitotane
Severity: Major
Dexamethasone and Mitotane: 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
Mitotane is a strong CYP3A4 inducer and can substantially lower dexamethasone exposure. Mitotane also impairs adrenal steroid synthesis and increases cortisol-binding globulin, so glucocorticoid replacement needs are altered. Reduced dexamethasone effect may lead to treatment failure.
What this interaction means in plain words
Dexamethasone and Mitotane 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.
Dexamethasone belongs to Endocrine; Mitotane belongs to Oncology.
Why it happens
Mitotane induces CYP3A4, accelerating dexamethasone metabolism.
What to do
Monitor clinical response and increase the dexamethasone dose if effect is inadequate. For adrenal replacement during mitotane, titrate glucocorticoid doses to clinical response, as higher doses are often required.
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 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 Mitotane
- Doravirine + Mitotane Contraindicated
- Fostemsavir + Mitotane Contraindicated
- Lorlatinib + Mitotane Contraindicated
- Abiraterone + Mitotane Major
- Apixaban + Mitotane Major
- Aprepitant + Mitotane Major
Frequently asked questions
Can I take Dexamethasone with Mitotane?
MediHelp rates the interaction as major. Dexamethasone and Mitotane 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. Mitotane is a strong CYP3A4 inducer and can substantially lower dexamethasone exposure. Mitotane also impairs adrenal steroid synthesis and increases cortisol-binding globulin, so glucocorticoid replacement needs are altered. Reduced dexamethasone effect may lead to treatment failure.
How serious is the interaction between Dexamethasone and Mitotane?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor clinical response and increase the dexamethasone dose if effect is inadequate. For adrenal replacement during mitotane, titrate glucocorticoid doses to clinical response, as higher doses are often required.
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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