Drug interactions
Dacomitinib + Thioridazine
Severity: Contraindicated
Dacomitinib and Thioridazine: contraindicated 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
Dacomitinib strongly inhibits CYP2D6, which is the main route of thioridazine clearance. Higher thioridazine levels increase the risk of QT prolongation and torsades de pointes.
What this interaction means in plain words
Dacomitinib and Thioridazine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Dacomitinib belongs to Oncology; Thioridazine belongs to Central Nervous System.
Why it happens
Dacomitinib inhibits CYP2D6, reducing thioridazine metabolism and raising its concentrations.
What to do
Avoid the combination; use an antipsychotic not dependent on CYP2D6 or an alternative EGFR inhibitor. If unavoidable, monitor ECG closely.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Other interactions of Dacomitinib
Frequently asked questions
Can I take Dacomitinib with Thioridazine?
MediHelp rates the interaction as contraindicated. Dacomitinib and Thioridazine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Dacomitinib strongly inhibits CYP2D6, which is the main route of thioridazine clearance. Higher thioridazine levels increase the risk of QT prolongation and torsades de pointes.
How serious is the interaction between Dacomitinib and Thioridazine?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination; use an antipsychotic not dependent on CYP2D6 or an alternative EGFR inhibitor. If unavoidable, monitor ECG closely.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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