Drug interactions
Ethotoin + Fluoxetine
Severity: Moderate
Ethotoin and Fluoxetine: moderate 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
Fluoxetine inhibits CYP2C9 and CYP2C19 and can raise concentrations of hydantoin anticonvulsants such as phenytoin. Ethotoin is a related hydantoin and may be similarly affected, risking toxicity such as ataxia, nystagmus and sedation. Data for ethotoin specifically are limited.
What this interaction means in plain words
Ethotoin and Fluoxetine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Fluoxetine and norfluoxetine inhibit CYP2C9/2C19 and may reduce hydantoin metabolism.
What to do
Monitor for signs of ethotoin toxicity and check serum levels if available, reducing the dose as needed.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Fluoxetine
- Fluoxetine + Isocarboxazid Contraindicated
- Fluoxetine + Mavacamten Contraindicated
- Fluoxetine + Methylene blue Contraindicated
- Fluoxetine + Phenelzine Contraindicated
- Fluoxetine + Pimozide Contraindicated
- Fluoxetine + Rasagiline Contraindicated
Frequently asked questions
Can I take Ethotoin with Fluoxetine?
MediHelp rates the interaction as moderate. Ethotoin and Fluoxetine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Fluoxetine inhibits CYP2C9 and CYP2C19 and can raise concentrations of hydantoin anticonvulsants such as phenytoin. Ethotoin is a related hydantoin and may be similarly affected, risking toxicity such as ataxia, nystagmus and sedation. Data for ethotoin specifically are limited.
How serious is the interaction between Ethotoin and Fluoxetine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for signs of ethotoin toxicity and check serum levels if available, reducing the dose as needed.
What other medicines interact with Fluoxetine?
MediHelp also lists interactions of Fluoxetine with, for example, Isocarboxazid, Mavacamten, Methylene blue. The full list is on the Fluoxetine page.
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