Drug interactions
Estradiol vaginal + Ribociclib
Severity: Minor
Estradiol vaginal and Ribociclib: minor 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
Vaginal estradiol has low systemic absorption, so any rise from CYP3A4 inhibition is small. The combination is also generally avoided in breast cancer because of hormonal considerations rather than a pharmacokinetic effect.
What this interaction means in plain words
Estradiol vaginal and Ribociclib have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Ribociclib inhibits CYP3A4, a partial pathway of estradiol metabolism.
What to do
No dose adjustment is needed for the pharmacokinetic effect. Review the appropriateness of estrogen use in hormone-receptor-positive breast cancer with the oncologist.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Estradiol vaginal and Ribociclib, 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 Ribociclib
- Amiodarone + Ribociclib Contraindicated
- Cisapride + Ribociclib Contraindicated
- Dofetilide + Ribociclib Contraindicated
- Dronedarone + Ribociclib Contraindicated
- Flibanserin + Ribociclib Contraindicated
- Ibutilide + Ribociclib Contraindicated
Frequently asked questions
Can I take Estradiol vaginal with Ribociclib?
MediHelp rates the interaction as minor. Estradiol vaginal and Ribociclib have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Vaginal estradiol has low systemic absorption, so any rise from CYP3A4 inhibition is small. The combination is also generally avoided in breast cancer because of hormonal considerations rather than a pharmacokinetic effect.
How serious is the interaction between Estradiol vaginal and Ribociclib?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose adjustment is needed for the pharmacokinetic effect. Review the appropriateness of estrogen use in hormone-receptor-positive breast cancer with the oncologist.
What other medicines interact with Ribociclib?
MediHelp also lists interactions of Ribociclib with, for example, Amiodarone, Cisapride, Dofetilide. The full list is on the Ribociclib 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.
