Drug interactions
Fluphenazine + Selpercatinib
Severity: Major
Fluphenazine and Selpercatinib: 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
Selpercatinib can prolong the QT interval, and fluphenazine carries a similar risk. Using them together may increase the chance of torsades de pointes, especially with electrolyte disorders or heart disease.
What this interaction means in plain words
Fluphenazine and Selpercatinib 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.
Fluphenazine belongs to Central Nervous System; Selpercatinib belongs to Oncology.
Why it happens
Additive QT prolongation.
What to do
Check baseline ECG and electrolytes, correct potassium and magnesium, and repeat ECG during treatment. Consider an alternative antipsychotic or dose reduction of selpercatinib if QTc becomes prolonged.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Other interactions of Selpercatinib
Frequently asked questions
Can I take Fluphenazine with Selpercatinib?
MediHelp rates the interaction as major. Fluphenazine and Selpercatinib 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. Selpercatinib can prolong the QT interval, and fluphenazine carries a similar risk. Using them together may increase the chance of torsades de pointes, especially with electrolyte disorders or heart disease.
How serious is the interaction between Fluphenazine and Selpercatinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check baseline ECG and electrolytes, correct potassium and magnesium, and repeat ECG during treatment. Consider an alternative antipsychotic or dose reduction of selpercatinib if QTc becomes prolonged.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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