Drug interactions
Escitalopram + Fentanyl
Severity: Major
Escitalopram and Fentanyl: 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
Combining fentanyl with an SSRI such as escitalopram can, in rare cases, cause serotonin syndrome, with agitation, tremor, hyperthermia, clonus and autonomic instability. The risk is highest after initiation or dose increases.
What this interaction means in plain words
Escitalopram and Fentanyl 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.
Escitalopram belongs to Central Nervous System; Fentanyl belongs to Musculoskeletal.
Why it happens
Additive serotonergic activity from fentanyl's weak serotonin reuptake effects and SSRI-mediated serotonin reuptake inhibition.
What to do
Use only when needed and start with low doses. Monitor for signs of serotonin syndrome, especially after dose changes, and stop the agents if it occurs.
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 Fentanyl
- Alvimopan + Fentanyl Contraindicated
- Fentanyl + Isocarboxazid Contraindicated
- Fentanyl + Olanzapine / samidorphan Contraindicated
- Fentanyl + Phenelzine Contraindicated
- Fentanyl + Tranylcypromine Contraindicated
- Alfentanil + Fentanyl Major
Other interactions of Escitalopram
- Cisapride + Escitalopram Contraindicated
- Citalopram + Escitalopram Contraindicated
- Escitalopram + Isocarboxazid Contraindicated
- Escitalopram + Methylene blue Contraindicated
- Escitalopram + Phenelzine Contraindicated
- Escitalopram + Pimozide Contraindicated
Frequently asked questions
Can I take Escitalopram with Fentanyl?
MediHelp rates the interaction as major. Escitalopram and Fentanyl 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 fentanyl with an SSRI such as escitalopram can, in rare cases, cause serotonin syndrome, with agitation, tremor, hyperthermia, clonus and autonomic instability. The risk is highest after initiation or dose increases.
How serious is the interaction between Escitalopram and Fentanyl?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use only when needed and start with low doses. Monitor for signs of serotonin syndrome, especially after dose changes, and stop the agents if it occurs.
What other medicines interact with Fentanyl?
MediHelp also lists interactions of Fentanyl with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Fentanyl page.
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