Drug interactions
Fluorouracil + Zanidatamab
Severity: Moderate
Fluorouracil and Zanidatamab: 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
Zanidatamab combined with bolus intravenous fluorouracil may increase the frequency or severity of diarrhea. Both drugs can cause gastrointestinal toxicity, and the bolus schedule appears to worsen this.
What this interaction means in plain words
Fluorouracil and Zanidatamab 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.
Fluorouracil belongs to Oncology; Zanidatamab belongs to Oncology.
Why it happens
Additive gastrointestinal toxicity, with bolus fluorouracil administration contributing to higher peak exposure.
What to do
Give fluorouracil as a continuous intravenous infusion rather than a bolus with zanidatamab. Monitor and treat diarrhea and hydration status promptly.
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 Fluorouracil
Frequently asked questions
Can I take Fluorouracil with Zanidatamab?
MediHelp rates the interaction as moderate. Fluorouracil and Zanidatamab 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. Zanidatamab combined with bolus intravenous fluorouracil may increase the frequency or severity of diarrhea. Both drugs can cause gastrointestinal toxicity, and the bolus schedule appears to worsen this.
How serious is the interaction between Fluorouracil and Zanidatamab?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give fluorouracil as a continuous intravenous infusion rather than a bolus with zanidatamab. Monitor and treat diarrhea and hydration status promptly.
What other medicines interact with Fluorouracil?
MediHelp also lists interactions of Fluorouracil with, for example, Adenovirus types 4 and 7 live, Axicabtagene ciloleucel, Belatacept. The full list is on the Fluorouracil page.
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