Drug interactions
Conivaptan + Regorafenib
Severity: Major
Conivaptan and Regorafenib: 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 inhibits CYP3A4 and may raise regorafenib exposure while lowering active metabolite levels, making efficacy and toxicity less predictable.
What this interaction means in plain words
Conivaptan and Regorafenib 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-mediated regorafenib metabolism.
What to do
Avoid concomitant use where possible and consider an alternative treatment for hyponatremia. If used, monitor for regorafenib toxicity including liver tests.
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 Regorafenib
Frequently asked questions
Can I take Conivaptan with Regorafenib?
MediHelp rates the interaction as major. Conivaptan and Regorafenib 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 inhibits CYP3A4 and may raise regorafenib exposure while lowering active metabolite levels, making efficacy and toxicity less predictable.
How serious is the interaction between Conivaptan and Regorafenib?
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 concomitant use where possible and consider an alternative treatment for hyponatremia. If used, monitor for regorafenib toxicity including liver tests.
What other medicines interact with Regorafenib?
MediHelp also lists interactions of Regorafenib with, for example, Apalutamide, Atazanavir, Carbamazepine. The full list is on the Regorafenib page.
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