Drug interactions
dextromethorphan + duloxetine
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.
Overview
Increased risk of serotonin syndrome; duloxetine may raise dextromethorphan levels via CYP2D6 inhibition.
Mechanism of action
Pharmacodynamic: additive serotonergic effects; Pharmacokinetic: duloxetine inhibits CYP2D6 → ↑ dextromethorphan exposure.
Clinical management
Avoid if possible; prefer nonserotonergic antitussive. If concurrent use is necessary, use lowest effective dextromethorphan dose for shortest duration and monitor closely for serotonin toxicity.
Drug reference
References
- Duloxetine: Drug Interactions — Lexicomp
- Dextromethorphan and duloxetine Interactions — Drugs.com
Frequently asked questions
Can I take dextromethorphan with duloxetine?
The interaction is rated: Major. Increased risk of serotonin syndrome; duloxetine may raise dextromethorphan levels via CYP2D6 inhibition.
How serious is the interaction between dextromethorphan and duloxetine?
The interaction is rated: Major. Evidence level: Moderate.
How is the interaction between dextromethorphan and duloxetine managed?
Avoid if possible; prefer nonserotonergic antitussive. If concurrent use is necessary, use lowest effective dextromethorphan dose for shortest duration and monitor closely for serotonin toxicity.
Why do dextromethorphan and duloxetine interact?
Pharmacodynamic: additive serotonergic effects; Pharmacokinetic: duloxetine inhibits CYP2D6 → ↑ dextromethorphan exposure.
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