Drug interactions
Divalproex sodium + Sodium oxybate
Severity: Major
Divalproex sodium and Sodium oxybate: major interaction.
Last updated Sources: US FDA label
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 raises systemic exposure to gamma-hydroxybutyrate, the active component of sodium oxybate. This can intensify sedation, respiratory depression and other CNS effects.
What this interaction means in plain words
Divalproex sodium and Sodium oxybate 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.
Divalproex sodium belongs to Central Nervous System; Sodium oxybate belongs to Central Nervous System.
Why it happens
Valproate is thought to inhibit GHB metabolism (including dehydrogenase pathways), reducing GHB clearance.
What to do
Lower the starting sodium oxybate dose when valproate is added or already in use, and monitor sedation, respiratory status and clinical response. Titrate cautiously.
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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References
Other interactions of Sodium oxybate
- Alprazolam + Sodium oxybate Contraindicated
- Amobarbital + Sodium oxybate Contraindicated
- Butorphanol + Sodium oxybate Contraindicated
- Chloral hydrate + Sodium oxybate Contraindicated
- Clonazepam + Sodium oxybate Contraindicated
- Clorazepate + Sodium oxybate Contraindicated
Frequently asked questions
Can I take Divalproex sodium with Sodium oxybate?
MediHelp rates the interaction as major. Divalproex sodium and Sodium oxybate 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. Valproate raises systemic exposure to gamma-hydroxybutyrate, the active component of sodium oxybate. This can intensify sedation, respiratory depression and other CNS effects.
How serious is the interaction between Divalproex sodium and Sodium oxybate?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Lower the starting sodium oxybate dose when valproate is added or already in use, and monitor sedation, respiratory status and clinical response. Titrate cautiously.
What other medicines interact with Sodium oxybate?
MediHelp also lists interactions of Sodium oxybate with, for example, Alprazolam, Amobarbital, Butorphanol. The full list is on the Sodium oxybate page.
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