Drug interactions
Dexamethasone + Rifampin
Severity: Major
Dexamethasone and Rifampin: major interaction.
Last updated Sources: US FDA label
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
Rifampin is a potent CYP3A4 inducer and markedly lowers dexamethasone exposure, which can lead to loss of anti-inflammatory, antiemetic or replacement effect. Adrenal crisis or treatment failure may occur in dependent patients.
What this interaction means in plain words
Dexamethasone and Rifampin 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.
Why it happens
Rifampin induces CYP3A4 and other enzymes, increasing dexamethasone clearance.
What to do
Monitor clinical response and increase the dexamethasone dose as needed, or use an alternative to rifampin; reassess dose when rifampin is stopped.
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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References
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
Frequently asked questions
Can I take Dexamethasone with Rifampin?
MediHelp rates the interaction as major. Dexamethasone and Rifampin 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. Rifampin is a potent CYP3A4 inducer and markedly lowers dexamethasone exposure, which can lead to loss of anti-inflammatory, antiemetic or replacement effect. Adrenal crisis or treatment failure may occur in dependent patients.
How serious is the interaction between Dexamethasone and Rifampin?
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 as needed, or use an alternative to rifampin; reassess dose when rifampin is stopped.
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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