Drug interactions
Carbamazepine + Fentanyl intranasal
Severity: Major
Carbamazepine and Fentanyl intranasal: 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
Carbamazepine reduces fentanyl concentrations, risking poor analgesia or withdrawal in dependent patients. Stopping carbamazepine can later raise fentanyl levels and cause respiratory depression.
What this interaction means in plain words
Carbamazepine and Fentanyl intranasal 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.
Why it happens
Carbamazepine induces CYP3A4, increasing fentanyl clearance.
What to do
Monitor analgesia and withdrawal, titrating fentanyl as needed. If carbamazepine is discontinued, reduce fentanyl and monitor for respiratory depression.
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 Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Fentanyl intranasal?
MediHelp rates the interaction as major. Carbamazepine and Fentanyl intranasal 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. Carbamazepine reduces fentanyl concentrations, risking poor analgesia or withdrawal in dependent patients. Stopping carbamazepine can later raise fentanyl levels and cause respiratory depression.
How serious is the interaction between Carbamazepine and Fentanyl intranasal?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor analgesia and withdrawal, titrating fentanyl as needed. If carbamazepine is discontinued, reduce fentanyl and monitor for respiratory depression.
What other medicines interact with Carbamazepine?
MediHelp also lists interactions of Carbamazepine with, for example, Artemether / lumefantrine, Cabotegravir, Delamanid. The full list is on the Carbamazepine page.
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