Sertraline and Tetrabenazine: 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
Sertraline
No brand names on recordTetrabenazine
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.
Taking sertraline (an antidepressant) together with tetrabenazine (Xenazine, used for movement disorders) needs some care. There are two things happening here. First, both medicines can affect your heart's electrical rhythm (something doctors call the QT interval), and using them together can add up. Second, sertraline slows down a liver enzyme that clears tetrabenazine, so more tetrabenazine can build up in your body, which can mean stronger side effects.
The good news is your care team can manage this. They may adjust your tetrabenazine dose and keep a closer eye on you, sometimes with a heart tracing (ECG). Don't stop or change either medicine on your own. Just check in with your pharmacist or doctor.
Effect: Increased risk of QTc prolongation plus increased tetrabenazine (and its active alpha-dihydrotetrabenazine metabolite) exposure.
- Mechanism: Additive QT prolongation; sertraline inhibits CYP2D6, reducing metabolism of the CYP2D6-substrate tetrabenazine, raising AUC/Cmax.
- Direction: Increased tetrabenazine exposure and additive cardiac risk.
- Evidence/severity: Probable, rated major. Onset unspecified.
- Management: Avoid concomitant use where possible. If combined, reduce the tetrabenazine dose, monitor ECG/QTc and electrolytes, and re-titrate tetrabenazine upward if sertraline is discontinued.
What happens
Increased risk of QT interval prolongation and an increased CYP2D6 substrate exposure
Interaction Deep Dive
Do not combine sertraline (which inhibits CYP2D6 and prolongs the QT interval) with medications that are both QT prolonging and CYP2D6 substrates. Using additional agents that lengthen the QTc interval together raises the likelihood of QTc prolongation and/or ventricular arrhythmias. It may be necessary to lower the dose of the CYP2D6 substrate. On the other hand, if sertraline is stopped, the CYP2D6 substrate dosage may need to be raised1.
Why it happens (mechanism)
Additive QT interval prolongation; inhibition of CYP2D6-substrate metabolism by sertraline
How to manage this interaction
Your care team can handle this combination safely if it's needed. Typically they will:
- Consider whether an alternative to one drug is appropriate, since guidance is to avoid pairing them when possible.
- Lower the tetrabenazine dose if you take both, since sertraline can raise tetrabenazine levels.
- Monitor you more closely, which may include a heart tracing (ECG) to watch your QT interval.
- Re-adjust the tetrabenazine dose upward if sertraline is later stopped.
Keep taking both exactly as prescribed unless told otherwise. Tell your pharmacist or prescriber about any fainting, dizziness, or a racing or irregular heartbeat, and make sure they know you take both.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) When risperiDONE 4 to 8 mg/day (a CYP2D6 substrate) was given together with PARoxetine 20 mg/day, mean plasma concentrations of risperiDONE rose approximately 4-fold 2.
Common questions
Can I take Sertraline and Tetrabenazine together?
Combining sertraline and tetrabenazine can add to heart-rhythm (QT) risk and raise tetrabenazine levels, so this pairing is usually avoided; if used, expect a lower tetrabenazine dose and closer monitoring. Talk with your pharmacist or doctor before changing anything. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Tetrabenazine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Sertraline and Tetrabenazine interaction managed?
Your care team can handle this combination safely if it's needed. Typically they will: Consider whether an alternative to one drug is appropriate, since guidance is to avoid pairing them when possible. Lower the tetrabenazine dose if you take both, since sertraline can raise tetrabenazine levels. Monitor you more closely, which may include a heart tracing (ECG) to watch your QT interval. Re-adjust… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
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 Tetrabenazine 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: PEXEVA(R) oral tablets, paroxetine mesylate oral tablets. Sebela Pharmaceuticals Inc (per FDA), Roswell, GA, 2023.
Keep reading about Sertraline
Keep reading about Tetrabenazine
These medications also interact with supplements
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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