Drug interactions
Tamoxifen + Venetoclax
Severity: Moderate
Tamoxifen and Venetoclax: 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
Tamoxifen inhibits P-glycoprotein and may raise venetoclax exposure. Higher levels may increase neutropenia and, early in therapy, tumor lysis syndrome risk.
What this interaction means in plain words
Tamoxifen and Venetoclax 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.
Tamoxifen belongs to Endocrine; Venetoclax belongs to Miscellaneous.
Why it happens
P-gp inhibition by tamoxifen increases venetoclax absorption and reduces efflux.
What to do
Monitor blood counts and tumor lysis parameters. Consider reducing the venetoclax dose per labeling for P-gp inhibitors.
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 Venetoclax
- Clarithromycin + Venetoclax Contraindicated
- Itraconazole + Venetoclax Contraindicated
- Ketoconazole + Venetoclax Contraindicated
- Posaconazole + Venetoclax Contraindicated
- Venetoclax + Voriconazole Contraindicated
- Amiodarone + Venetoclax Major
Frequently asked questions
Can I take Tamoxifen with Venetoclax?
MediHelp rates the interaction as moderate. Tamoxifen and Venetoclax 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. Tamoxifen inhibits P-glycoprotein and may raise venetoclax exposure. Higher levels may increase neutropenia and, early in therapy, tumor lysis syndrome risk.
How serious is the interaction between Tamoxifen and Venetoclax?
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 blood counts and tumor lysis parameters. Consider reducing the venetoclax dose per labeling for P-gp inhibitors.
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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