Drug interactions
Ethotoin + Valproic acid
Severity: Moderate
Ethotoin and Valproic acid: 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
Valproate displaces hydantoin anticonvulsants from protein binding and may inhibit their metabolism, as seen with phenytoin. By analogy, ethotoin exposure may rise, though specific data are limited.
What this interaction means in plain words
Ethotoin and Valproic acid 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
Possible inhibition of hydantoin metabolism and protein-binding displacement by valproate, extrapolated from phenytoin.
What to do
Monitor for signs of ethotoin toxicity such as ataxia, nystagmus and sedation, and adjust the dose on clinical response. Also watch for valproate-related hyperammonemia.
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 Valproic acid
- Ertapenem + Valproic acid Contraindicated
- Imipenem / cilastatin / relebactam + Valproic acid Contraindicated
- Imipenem / cilastatin + Valproic acid Contraindicated
- Meropenem / vaborbactam + Valproic acid Contraindicated
- Meropenem + Valproic acid Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Valproic acid Major
Frequently asked questions
Can I take Ethotoin with Valproic acid?
MediHelp rates the interaction as moderate. Ethotoin and Valproic acid 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. Valproate displaces hydantoin anticonvulsants from protein binding and may inhibit their metabolism, as seen with phenytoin. By analogy, ethotoin exposure may rise, though specific data are limited.
How serious is the interaction between Ethotoin and Valproic acid?
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 such as ataxia, nystagmus and sedation, and adjust the dose on clinical response. Also watch for valproate-related hyperammonemia.
What other medicines interact with Valproic acid?
MediHelp also lists interactions of Valproic acid with, for example, Ertapenem, Imipenem / cilastatin / relebactam, Imipenem / cilastatin. The full list is on the Valproic acid page.
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