Drug interactions
Dexamethasone + Rifapentine
Severity: Moderate
Dexamethasone and Rifapentine: 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
Rifapentine is an inducer of CYP3A4 and can substantially lower dexamethasone exposure. This may lead to loss of the intended anti-inflammatory, antiemetic or replacement effect.
What this interaction means in plain words
Dexamethasone and Rifapentine 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; Rifapentine belongs to Anti Bacterial.
Why it happens
Rifapentine induces CYP3A4 and increases dexamethasone metabolic clearance.
What to do
Monitor clinical response and increase the dexamethasone dose as required while on rifapentine. Readjust the dose after rifapentine is stopped, since induction wears off over weeks.
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 Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Dexamethasone with Rifapentine?
MediHelp rates the interaction as moderate. Dexamethasone and Rifapentine 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. Rifapentine is an inducer of CYP3A4 and can substantially lower dexamethasone exposure. This may lead to loss of the intended anti-inflammatory, antiemetic or replacement effect.
How serious is the interaction between Dexamethasone and Rifapentine?
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 as required while on rifapentine. Readjust the dose after rifapentine is stopped, since induction wears off over weeks.
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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