Drug interactions
Cobimetinib + Efavirenz
Severity: Contraindicated
Cobimetinib 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 induces CYP3A4 and can markedly lower cobimetinib exposure. This may lead to loss of antitumour efficacy.
What this interaction means in plain words
Cobimetinib 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.
Cobimetinib belongs to Oncology; Efavirenz belongs to Anti Virals.
Why it happens
Induction of CYP3A4-mediated metabolism of cobimetinib by efavirenz.
What to do
Avoid the combination and use an alternative antiretroviral without enzyme-inducing properties. If it cannot be avoided, seek oncology and HIV specialist input.
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?
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Other interactions of Efavirenz
- Dienogest / estradiol valerate + Efavirenz Contraindicated
- Dihydroergotamine intranasal + Efavirenz Contraindicated
- Dihydroergotamine + Efavirenz Contraindicated
- Doravirine + Efavirenz Contraindicated
- Efavirenz + Elbasvir / grazoprevir Contraindicated
- Efavirenz + Elvitegravir / cobicistat / emtricitabine / tenofovir df Contraindicated
Other interactions of Cobimetinib
- Cobimetinib + Posaconazole Contraindicated
- Amobarbital + Cobimetinib Major
- Apalutamide + Cobimetinib Major
- Aprepitant + Cobimetinib Major
- Bosentan + Cobimetinib Major
- Carbamazepine + Cobimetinib Major
Frequently asked questions
Can I take Cobimetinib with Efavirenz?
MediHelp rates the interaction as contraindicated. Cobimetinib 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 induces CYP3A4 and can markedly lower cobimetinib exposure. This may lead to loss of antitumour efficacy.
How serious is the interaction between Cobimetinib 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 the combination and use an alternative antiretroviral without enzyme-inducing properties. If it cannot be avoided, seek oncology and HIV specialist input.
What other medicines interact with Efavirenz?
MediHelp also lists interactions of Efavirenz with, for example, Dienogest / estradiol valerate, Dihydroergotamine intranasal, Dihydroergotamine. The full list is on the Efavirenz page.
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