Efavirenz and Naltrexone and bupropion interaction
Efavirenz and Naltrexone and bupropion: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Naltrexone and bupropion (Contrave Extended-Release) label · effective 2025-11-10
CYP2B6 Inducers (e.g., ritonavir, lopinavir, efavirenz, carbamazepine, phenobarbital, and phenytoin) may reduce efficacy by reducing bupropion exposure, avoid concomitant use.
Avoiding concomitant use with ritonavir, lopinavir, or efavirenz is recommended [see Clinical Pharmacology (12.3) ] .
Inducers of CYP2B6: Ritonavir, Lopinavir, and Efavirenz: Concomitant treatment with these drugs can decrease bupropion and hydroxybupropion exposure and may reduce efficacy.
From the Efavirenz label · effective 2024-03-31
Bupropion dose should not exceed the maximum recommended dose.
Antidepressant: Bupropion Sertraline ↓ bupropion * ↓ sertraline * Increases in bupropion dosage should be guided by clinical response.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.