Drug interactions
Conivaptan + Irinotecan
Severity: Major
Conivaptan and Irinotecan: major 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
Conivaptan is a CYP3A4 inhibitor and may raise irinotecan and SN-38 exposure. Severe diarrhea and myelosuppression are possible.
What this interaction means in plain words
Conivaptan and Irinotecan can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Conivaptan inhibits CYP3A4, reducing irinotecan oxidative metabolism.
What to do
Avoid concurrent use where possible, and treat hyponatremia with an alternative. If it must be used, monitor for diarrhea and neutropenia.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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
Frequently asked questions
Can I take Conivaptan with Irinotecan?
MediHelp rates the interaction as major. Conivaptan and Irinotecan can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Conivaptan is a CYP3A4 inhibitor and may raise irinotecan and SN-38 exposure. Severe diarrhea and myelosuppression are possible.
How serious is the interaction between Conivaptan and Irinotecan?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use where possible, and treat hyponatremia with an alternative. If it must be used, monitor for diarrhea and neutropenia.
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.
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