Drug interactions
Fluphenazine + Osimertinib
Severity: Major
Fluphenazine and Osimertinib: 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
Osimertinib can prolong the QTc interval, and phenothiazines such as fluphenazine have a similar effect. Combined use may add to the risk of ventricular arrhythmias including torsades de pointes, especially with electrolyte abnormalities or cardiac disease.
What this interaction means in plain words
Fluphenazine and Osimertinib 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; Osimertinib belongs to Oncology.
Why it happens
Additive QT prolongation through effects on cardiac repolarization.
What to do
Check a baseline ECG and electrolytes, correct potassium and magnesium, and repeat ECGs periodically during treatment. Stop or substitute one drug if the QTc rises markedly or symptoms develop.
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 Osimertinib
Frequently asked questions
Can I take Fluphenazine with Osimertinib?
MediHelp rates the interaction as major. Fluphenazine and Osimertinib 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. Osimertinib can prolong the QTc interval, and phenothiazines such as fluphenazine have a similar effect. Combined use may add to the risk of ventricular arrhythmias including torsades de pointes, especially with electrolyte abnormalities or cardiac disease.
How serious is the interaction between Fluphenazine and Osimertinib?
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 a baseline ECG and electrolytes, correct potassium and magnesium, and repeat ECGs periodically during treatment. Stop or substitute one drug if the QTc rises markedly or symptoms develop.
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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