Drug interactions
Fostemsavir + Irinotecan
Severity: Moderate
Fostemsavir and Irinotecan: 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
Temsavir, the active form of fostemsavir, inhibits BCRP, which handles SN-38 and irinotecan. Higher exposure may increase the risk of diarrhoea and neutropenia.
What this interaction means in plain words
Fostemsavir and Irinotecan 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.
Fostemsavir belongs to Anti Virals; Irinotecan belongs to Oncology.
Why it happens
BCRP inhibition by temsavir decreases efflux and elimination of irinotecan and SN-38.
What to do
Monitor for severe diarrhoea and neutropenia, and consider reducing the irinotecan dose if toxicity occurs.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Fostemsavir and Irinotecan, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Irinotecan
- Clozapine + Irinotecan Contraindicated
- Irinotecan + Sacituzumab govitecan Contraindicated
- Adenovirus types 4 and 7 live + Irinotecan Major
- Apalutamide + Irinotecan Major
- Atazanavir + Irinotecan Major
- Carbamazepine + Irinotecan Major
Other interactions of Fostemsavir
- Apalutamide + Fostemsavir Contraindicated
- Carbamazepine + Fostemsavir Contraindicated
- Enzalutamide + Fostemsavir Contraindicated
- Fostemsavir + Mitotane Contraindicated
- Fostemsavir + Phenytoin Contraindicated
- Fostemsavir + Rifampicin Contraindicated
Frequently asked questions
Can I take Fostemsavir with Irinotecan?
MediHelp rates the interaction as moderate. Fostemsavir and Irinotecan 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. Temsavir, the active form of fostemsavir, inhibits BCRP, which handles SN-38 and irinotecan. Higher exposure may increase the risk of diarrhoea and neutropenia.
How serious is the interaction between Fostemsavir and Irinotecan?
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 severe diarrhoea and neutropenia, and consider reducing the irinotecan dose if toxicity occurs.
What other medicines interact with Irinotecan?
MediHelp also lists interactions of Irinotecan with, for example, Clozapine, Sacituzumab govitecan, Adenovirus types 4 and 7 live. The full list is on the Irinotecan page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
