Drug interactions
Fentanyl intranasal + Valproic acid
Severity: Moderate
Fentanyl intranasal 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
Fentanyl is a potent opioid and valproate is a CNS depressant, so together they may cause additive sedation and respiratory depression. The effect is most important with repeated or higher doses.
What this interaction means in plain words
Fentanyl intranasal 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
Additive central nervous system and respiratory depression.
What to do
Use the lowest effective fentanyl dose and monitor sedation and respiratory rate. Counsel the patient to avoid alcohol and other sedatives.
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 Fentanyl intranasal with Valproic acid?
MediHelp rates the interaction as moderate. Fentanyl intranasal 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. Fentanyl is a potent opioid and valproate is a CNS depressant, so together they may cause additive sedation and respiratory depression. The effect is most important with repeated or higher doses.
How serious is the interaction between Fentanyl intranasal 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: Use the lowest effective fentanyl dose and monitor sedation and respiratory rate. Counsel the patient to avoid alcohol and other sedatives.
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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