Drug interactions
Fentanyl intranasal + Nortriptyline
Severity: Major
Fentanyl intranasal and Nortriptyline: major 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
Combining a tricyclic antidepressant with fentanyl increases sedation and may deepen respiratory depression. Tricyclics also have serotonergic activity, so serotonin syndrome is a further concern. Nortriptyline is a CYP2D6 substrate, not a fentanyl-metabolizing pathway.
What this interaction means in plain words
Fentanyl intranasal and Nortriptyline 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
Additive CNS and respiratory depression, plus additive serotonergic effects.
What to do
Reserve the combination for patients without adequate alternatives, using the lowest effective doses. Monitor sedation, respiratory rate and signs of serotonin toxicity.
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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Other interactions of Nortriptyline
- Disopyramide + Nortriptyline Contraindicated
- Dofetilide + Nortriptyline Contraindicated
- Dronedarone + Nortriptyline Contraindicated
- Ibutilide + Nortriptyline Contraindicated
- Isocarboxazid + Nortriptyline Contraindicated
- Methylene blue + Nortriptyline Contraindicated
Frequently asked questions
Can I take Fentanyl intranasal with Nortriptyline?
MediHelp rates the interaction as major. Fentanyl intranasal and Nortriptyline 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. Combining a tricyclic antidepressant with fentanyl increases sedation and may deepen respiratory depression. Tricyclics also have serotonergic activity, so serotonin syndrome is a further concern. Nortriptyline is a CYP2D6 substrate, not a fentanyl-metabolizing pathway.
How serious is the interaction between Fentanyl intranasal and Nortriptyline?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Reserve the combination for patients without adequate alternatives, using the lowest effective doses. Monitor sedation, respiratory rate and signs of serotonin toxicity.
What other medicines interact with Nortriptyline?
MediHelp also lists interactions of Nortriptyline with, for example, Disopyramide, Dofetilide, Dronedarone. The full list is on the Nortriptyline page.
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