Drug interactions
Amitriptyline + Fentanyl intranasal
Severity: Major
Amitriptyline and Fentanyl intranasal: 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
Fentanyl combined with a sedating tricyclic increases CNS and respiratory depression. Serotonergic toxicity is also possible.
What this interaction means in plain words
Amitriptyline 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
Additive CNS depression, with added serotonergic activity and possible CYP3A4 or 2D6 competition.
What to do
Reserve for patients without alternatives, use the lowest doses and monitor sedation and respiratory rate. Counsel on avoiding alcohol and other sedatives.
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 Amitriptyline
- Amitriptyline + Isocarboxazid Contraindicated
- Amitriptyline + Methylene blue Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amitriptyline + Procarbazine Contraindicated
- Amitriptyline + Safinamide Contraindicated
Frequently asked questions
Can I take Amitriptyline with Fentanyl intranasal?
MediHelp rates the interaction as major. Amitriptyline 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. Fentanyl combined with a sedating tricyclic increases CNS and respiratory depression. Serotonergic toxicity is also possible.
How serious is the interaction between Amitriptyline 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: Reserve for patients without alternatives, use the lowest doses and monitor sedation and respiratory rate. Counsel on avoiding alcohol and other sedatives.
What other medicines interact with Amitriptyline?
MediHelp also lists interactions of Amitriptyline with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Amitriptyline page.
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