Drug interactions
Idelalisib + Quetiapine
Severity: Major
Idelalisib and Quetiapine: 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 markedly increases exposure to quetiapine, which depends on CYP3A4 for clearance. This may cause excessive sedation, hypotension and QT prolongation.
What this interaction means in plain words
Idelalisib and Quetiapine 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; Quetiapine belongs to Central Nervous System.
Why it happens
Strong CYP3A4 inhibition decreases quetiapine metabolism.
What to do
Avoid if possible; otherwise reduce the quetiapine dose substantially, following labeling for strong CYP3A inhibitors. Monitor sedation, blood pressure and ECG.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
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 Quetiapine?
MediHelp rates the interaction as major. Idelalisib and Quetiapine 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 markedly increases exposure to quetiapine, which depends on CYP3A4 for clearance. This may cause excessive sedation, hypotension and QT prolongation.
How serious is the interaction between Idelalisib and Quetiapine?
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 if possible; otherwise reduce the quetiapine dose substantially, following labeling for strong CYP3A inhibitors. Monitor sedation, blood pressure and ECG.
What other medicines interact with Quetiapine?
MediHelp also lists interactions of Quetiapine with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Quetiapine page.
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