Drug interactions
Dihydroergotamine intranasal + Efavirenz
Severity: Contraindicated
Dihydroergotamine intranasal and Efavirenz: contraindicated 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 alters CYP3A4 activity and may change systemic dihydroergotamine exposure unpredictably. Elevated ergot levels risk serious vasospastic ischemia.
What this interaction means in plain words
Dihydroergotamine intranasal and Efavirenz are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Why it happens
Efavirenz modulation of CYP3A4 metabolism of dihydroergotamine.
What to do
Avoid and choose a non-ergot migraine therapy.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dihydroergotamine intranasal and Efavirenz, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Efavirenz
- Cobimetinib + Efavirenz Contraindicated
- Dienogest / estradiol valerate + Efavirenz Contraindicated
- Dihydroergotamine + Efavirenz Contraindicated
- Doravirine + Efavirenz Contraindicated
- Efavirenz + Elbasvir / grazoprevir Contraindicated
- Efavirenz + Elvitegravir / cobicistat / emtricitabine / tenofovir df Contraindicated
Frequently asked questions
Can I take Dihydroergotamine intranasal with Efavirenz?
MediHelp rates the interaction as contraindicated. Dihydroergotamine intranasal and Efavirenz are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Efavirenz alters CYP3A4 activity and may change systemic dihydroergotamine exposure unpredictably. Elevated ergot levels risk serious vasospastic ischemia.
How serious is the interaction between Dihydroergotamine intranasal and Efavirenz?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid and choose a non-ergot migraine therapy.
What other medicines interact with Efavirenz?
MediHelp also lists interactions of Efavirenz with, for example, Cobimetinib, Dienogest / estradiol valerate, Dihydroergotamine. The full list is on the Efavirenz page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
