Sertraline and Dextromethorphan: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Dextromethorphan
Sertraline
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
If you take sertraline for your mood and reach for a cough medicine with dextromethorphan (like Delsym), it's worth a quick check with your care team. Sertraline can slow down how your body clears dextromethorphan, so more of it can build up. Both medicines also raise a brain chemical called serotonin, and together they can occasionally push it too high.
This is called serotonin syndrome. Watch for things like agitation, shakiness, a fast heartbeat, sweating, fever, or muscle twitching. This is mostly a theoretical concern, so please don't panic. Your pharmacist or doctor can help you pick a safe cough option or adjust things so you stay comfortable.
Effect: Sertraline (moderate CYP2D6 inhibitor) reduces metabolism of dextromethorphan (CYP2D6 substrate), increasing dextromethorphan exposure; both agents are serotonergic, so additive serotonergic effects raise serotonin syndrome risk.
Direction: increased dextromethorphan levels and effect. Onset: delayed. Evidence: theoretical (extrapolated from a paroxetine/dextromethorphan/quinidine study).
- Consider lower initial dextromethorphan dosing with concurrent CYP2D6 inhibitor.
- Monitor for serotonin syndrome (autonomic instability, neuromuscular signs, mental status changes), especially at initiation and dose increases.
- Dextromethorphan dose may need upward adjustment if sertraline is stopped.
- If serotonin syndrome is suspected, discontinue offending agents and give supportive care.
What happens
Increased dextromethorphan exposure and an increased risk of serotonin syndrome
Interaction Deep Dive
Because sertraline acts as a moderate CYP2D6 inhibitor1 and dextromethorphan is metabolized by CYP2D6 (a CYP2D6 substrate), an interaction is plausible. Although this specific pairing has not been directly investigated, one study examining PARoxetine (a different SSRI) given together with the dextromethorphan/quiNIDine combination showed elevated AUC and Cmax values for PARoxetine, dextromethorphan, and quiNIDine. Given that taking dextromethorphan alongside sertraline could heighten the likelihood of serotonin syndrome, lowering the starting dose of dextromethorphan may be appropriate 2. Should sertraline be stopped, a higher dextromethorphan dose might become necessary. When the two drugs must be used together, watch for signs of serotonin syndrome, particularly when therapy is started or doses are raised. Upon suspicion of serotonin syndrome, sertraline and/or dextromethorphan should be stopped without delay and supportive care initiated 1.
Why it happens (mechanism)
Inhibition of CYP2D6-mediated dextromethorphan metabolism by sertraline; additive serotonergic effects
How to manage this interaction
Keep taking your sertraline as prescribed. The main thing here is being thoughtful about dextromethorphan-containing cough products.
- Ask your pharmacist before buying an OTC cough medicine so they can check for dextromethorphan and suggest an alternative if needed.
- Your team may start dextromethorphan at a lower dose and monitor you more closely, especially when starting or increasing it.
- If sertraline is later stopped, your dextromethorphan dose may need to be adjusted by your care team.
- Seek care promptly for agitation, fever, sweating, fast heartbeat, muscle twitching, or shivering.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Among 14 healthy participants, giving PARoxetine (20 mg once daily for 12 days) and then a combination of dextromethorphan 30 mg/quiNIDine 30 mg (twice daily for 8 days) produced a rise in PARoxetine AUC and Cmax (1.7-fold and 1.5-fold, respectively) and a reduction in dextrorphan AUC and Cmax (34% and 33%, respectively). Exposure to dextromethorphan/quiNIDine showed no significant change. In a second group of 13 healthy participants, giving dextromethorphan 30 mg/quiNIDine 30 mg (twice daily for 8 days) and then PARoxetine (20 mg once daily for 12 days) produced a rise in dextromethorphan AUC and Cmax (1.5-fold and 1.4-fold, respectively), a reduction in dextrorphan AUC and Cmax (14% and 18%, respectively), a rise in quiNIDine AUC and Cmax (1.4-fold and 1.3-fold, respectively), and a rise in PARoxetine AUC and Cmax (2.3-fold and 2-fold, respectively) 2.
Common questions
Can I take Sertraline and Dextromethorphan together?
Sertraline can raise dextromethorphan levels and add to serotonin effects, so check with your pharmacist before using dextromethorphan cough products and watch for serotonin syndrome symptoms. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Dextromethorphan interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How is the Sertraline and Dextromethorphan interaction managed?
Keep taking your sertraline as prescribed. The main thing here is being thoughtful about dextromethorphan-containing cough products. Ask your pharmacist before buying an OTC cough medicine so they can check for dextromethorphan and suggest an alternative if needed. Your team may start dextromethorphan at a lower dose and monitor you more closely, especially when starting or increasing it. If sertr… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Sertraline or Dextromethorphan need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (2)
- Product Information: ZOLOFT oral tablets, oral solution, sertraline hydrochloride oral tablets, oral solution. Viatris Specialty LLC (per FDA), Morgantown, WV, 2023. DailyMed
- Product Information: NUEDEXTA(TM) oral capsules, dextromethorphan hydrobromide and quinidine sulfate oral capsules. Avanir Pharmaceuticals, Inc, Aliso Viejo, CA, 2010. DailyMed
Keep reading about Dextromethorphan
Keep reading about Sertraline
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Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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