Drug interactions
Dexamethasone + Efavirenz
Severity: Moderate
Dexamethasone and Efavirenz: 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
Efavirenz may reduce dexamethasone exposure, lessening its anti-inflammatory or antiemetic effect. Dexamethasone is also a weak-to-moderate CYP3A4 inducer and may lower efavirenz levels with prolonged use.
What this interaction means in plain words
Dexamethasone and Efavirenz 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; Efavirenz belongs to Anti Virals.
Why it happens
Mutual CYP3A4 induction; efavirenz increases dexamethasone clearance.
What to do
Monitor clinical response to dexamethasone and consider a higher dose if needed. With prolonged dexamethasone, monitor HIV viral load.
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 Efavirenz
- Cobimetinib + Efavirenz Contraindicated
- Dienogest / estradiol valerate + Efavirenz Contraindicated
- Dihydroergotamine intranasal + Efavirenz Contraindicated
- Dihydroergotamine + Efavirenz Contraindicated
- Doravirine + Efavirenz Contraindicated
- Efavirenz + Elbasvir / grazoprevir Contraindicated
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 Efavirenz?
MediHelp rates the interaction as moderate. Dexamethasone and Efavirenz 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. Efavirenz may reduce dexamethasone exposure, lessening its anti-inflammatory or antiemetic effect. Dexamethasone is also a weak-to-moderate CYP3A4 inducer and may lower efavirenz levels with prolonged use.
How serious is the interaction between Dexamethasone and Efavirenz?
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 to dexamethasone and consider a higher dose if needed. With prolonged dexamethasone, monitor HIV viral load.
What other medicines interact with Efavirenz?
MediHelp also lists interactions of Efavirenz with, for example, Cobimetinib, Dienogest / estradiol valerate, Dihydroergotamine intranasal. The full list is on the Efavirenz page.
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