Drug interactions
Flutamide + Idelalisib
Severity: Major
Flutamide and Idelalisib: 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 may raise flutamide exposure. Both drugs carry a risk of serious hepatotoxicity, so the combination may increase liver injury risk.
What this interaction means in plain words
Flutamide and Idelalisib 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.
Flutamide belongs to Endocrine; Idelalisib belongs to Oncology.
Why it happens
CYP3A4 inhibition by idelalisib reduces flutamide metabolism, compounded by additive hepatotoxicity.
What to do
Avoid the combination where possible. If used, monitor liver enzymes frequently and stop either drug if significant elevation occurs.
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 Flutamide
- Flutamide + Levoketoconazole Major
- Flutamide + Pexidartinib Major
- Flutamide + Pretomanid Major
- Flutamide + Valoctocogene roxaparvovec Major
- Apalutamide + Flutamide Moderate
- Bupivacaine implant + Flutamide Moderate
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 Flutamide with Idelalisib?
MediHelp rates the interaction as major. Flutamide and Idelalisib 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 may raise flutamide exposure. Both drugs carry a risk of serious hepatotoxicity, so the combination may increase liver injury risk.
How serious is the interaction between Flutamide and Idelalisib?
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 where possible. If used, monitor liver enzymes frequently and stop either drug if significant elevation occurs.
What other medicines interact with Flutamide?
MediHelp also lists interactions of Flutamide with, for example, Levoketoconazole, Pexidartinib, Pretomanid. The full list is on the Flutamide page.
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