Drug interactions
Fexinidazole + Tamoxifen
Severity: Moderate
Fexinidazole 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
Fexinidazole may inhibit CYP3A4, which could reduce conversion of tamoxifen to its active metabolites. This might weaken the antiestrogen effect, though the clinical impact is not well characterized.
What this interaction means in plain words
Fexinidazole 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.
Why it happens
CYP3A4 inhibition may reduce formation of N-desmethyltamoxifen and downstream active metabolites.
What to do
Fexinidazole is given as a short course, so consider the interaction clinically brief and monitor for effect. Avoid if an alternative is available.
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
Frequently asked questions
Can I take Fexinidazole with Tamoxifen?
MediHelp rates the interaction as moderate. Fexinidazole 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. Fexinidazole may inhibit CYP3A4, which could reduce conversion of tamoxifen to its active metabolites. This might weaken the antiestrogen effect, though the clinical impact is not well characterized.
How serious is the interaction between Fexinidazole 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: Fexinidazole is given as a short course, so consider the interaction clinically brief and monitor for effect. Avoid if an alternative is available.
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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