Drug interactions
Dexamethasone + Rifabutin
Severity: Moderate
Dexamethasone and Rifabutin: 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
Rifabutin induces CYP3A4 and can lower dexamethasone exposure, reducing its anti-inflammatory or replacement effect. Rifabutin is a weaker inducer than rifampicin but the effect can still matter.
What this interaction means in plain words
Dexamethasone and Rifabutin 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; Rifabutin belongs to Anti Bacterial.
Why it happens
Rifabutin induces CYP3A4, accelerating dexamethasone metabolism.
What to do
Monitor clinical response and increase the dexamethasone dose if needed. Reassess the dose when rifabutin is stopped.
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 Rifabutin
- Cabotegravir + Rifabutin Contraindicated
- Lorlatinib + Rifabutin Contraindicated
- Rifabutin + Voriconazole Contraindicated
- Apixaban + Rifabutin Major
- Axitinib + Rifabutin Major
- Brexpiprazole + Rifabutin Major
Frequently asked questions
Can I take Dexamethasone with Rifabutin?
MediHelp rates the interaction as moderate. Dexamethasone and Rifabutin 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. Rifabutin induces CYP3A4 and can lower dexamethasone exposure, reducing its anti-inflammatory or replacement effect. Rifabutin is a weaker inducer than rifampicin but the effect can still matter.
How serious is the interaction between Dexamethasone and Rifabutin?
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 clinical response and increase the dexamethasone dose if needed. Reassess the dose when rifabutin 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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