Drug interactions
Encorafenib + Tamoxifen
Severity: Moderate
Encorafenib and Tamoxifen: 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
Encorafenib induces CYP3A4 and may lower tamoxifen and active metabolite exposure, although it also inhibits CYP3A4 so the net effect is uncertain. Reduced tamoxifen efficacy is the main concern.
What this interaction means in plain words
Encorafenib and Tamoxifen 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.
Encorafenib belongs to Oncology; Tamoxifen belongs to Endocrine.
Why it happens
Encorafenib has mixed CYP3A4 induction and inhibition, which may alter tamoxifen metabolism.
What to do
Monitor for reduced therapeutic response to tamoxifen and for adverse effects.
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 Tamoxifen
- Amiodarone + Tamoxifen Major
- Anastrozole + Tamoxifen Major
- Bupropion + Tamoxifen Major
- Carbamazepine + Tamoxifen Major
- Cinacalcet + Tamoxifen Major
- Dacomitinib + Tamoxifen Major
Other interactions of Encorafenib
Frequently asked questions
Can I take Encorafenib with Tamoxifen?
MediHelp rates the interaction as moderate. Encorafenib and Tamoxifen 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. Encorafenib induces CYP3A4 and may lower tamoxifen and active metabolite exposure, although it also inhibits CYP3A4 so the net effect is uncertain. Reduced tamoxifen efficacy is the main concern.
How serious is the interaction between Encorafenib and Tamoxifen?
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 for reduced therapeutic response to tamoxifen and for adverse effects.
What other medicines interact with Tamoxifen?
MediHelp also lists interactions of Tamoxifen with, for example, Amiodarone, Anastrozole, Bupropion. The full list is on the Tamoxifen page.
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