Drug interactions
Efavirenz + Lenvatinib
Severity: Moderate
Efavirenz and Lenvatinib: 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
Both drugs can prolong the QT interval, so combined use may increase the risk of torsades de pointes, particularly with electrolyte disturbances or cardiac disease.
What this interaction means in plain words
Efavirenz and Lenvatinib 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 belongs to Anti Virals; Lenvatinib belongs to Oncology.
Why it happens
Additive QTc prolongation through cardiac repolarization effects.
What to do
Obtain a baseline ECG and correct potassium, magnesium and calcium. Repeat ECGs periodically and consider an alternative if QTc becomes markedly prolonged.
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 Lenvatinib
- Amiodarone + Lenvatinib Major
- Amisulpride + Lenvatinib Major
- Asenapine + Lenvatinib Major
- Chlorpromazine + Lenvatinib Major
- Donepezil + Lenvatinib Major
- Haloperidol + Lenvatinib Major
Frequently asked questions
Can I take Efavirenz with Lenvatinib?
MediHelp rates the interaction as moderate. Efavirenz and Lenvatinib 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. Both drugs can prolong the QT interval, so combined use may increase the risk of torsades de pointes, particularly with electrolyte disturbances or cardiac disease.
How serious is the interaction between Efavirenz and Lenvatinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and correct potassium, magnesium and calcium. Repeat ECGs periodically and consider an alternative if QTc becomes markedly prolonged.
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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