Drug interactions
Idelalisib + Mifepristone
Severity: Major
Idelalisib and Mifepristone: 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
Idelalisib is a strong CYP3A inhibitor and mifepristone is a CYP3A4 substrate, so mifepristone exposure may rise. This increases the risk of its adverse effects, including adrenal insufficiency, hypokalemia and QT prolongation.
What this interaction means in plain words
Idelalisib and Mifepristone 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.
Idelalisib belongs to Oncology; Mifepristone belongs to Endocrine.
Why it happens
Idelalisib inhibits CYP3A4, reducing mifepristone clearance.
What to do
Avoid the combination when possible. If used, reduce the mifepristone dose and monitor potassium, ECG and signs of adrenal insufficiency.
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 Mifepristone
- Apixaban + Mifepristone Contraindicated
- Argatroban + Mifepristone Contraindicated
- Cisapride + Mifepristone Contraindicated
- Cortisone + Mifepristone Contraindicated
- Cyclosporin + Mifepristone Contraindicated
- Dabigatran etexilate + Mifepristone Contraindicated
Other interactions of Idelalisib
- Alfuzosin + Idelalisib Contraindicated
- Cisapride + Idelalisib Contraindicated
- Dihydroergotamine + Idelalisib Contraindicated
- Dronedarone + Idelalisib Contraindicated
- Eletriptan + Idelalisib Contraindicated
- Eplerenone + Idelalisib Contraindicated
Frequently asked questions
Can I take Idelalisib with Mifepristone?
MediHelp rates the interaction as major. Idelalisib and Mifepristone 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. Idelalisib is a strong CYP3A inhibitor and mifepristone is a CYP3A4 substrate, so mifepristone exposure may rise. This increases the risk of its adverse effects, including adrenal insufficiency, hypokalemia and QT prolongation.
How serious is the interaction between Idelalisib and Mifepristone?
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 the combination when possible. If used, reduce the mifepristone dose and monitor potassium, ECG and signs of adrenal insufficiency.
What other medicines interact with Mifepristone?
MediHelp also lists interactions of Mifepristone with, for example, Apixaban, Argatroban, Cisapride. The full list is on the Mifepristone page.
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