Sertraline and Trazodone: 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 recordTrazodone
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.
Sertraline (an antidepressant) and trazodone both raise a brain chemical called serotonin. When you take them together, serotonin can climb too high. That can cause something called serotonin syndrome, with symptoms like feeling agitated or restless, fast heartbeat, sweating, shaking, muscle twitching, or a high fever. Both drugs can also affect your heart's rhythm slightly.
The good news is that many people do take these two safely under a doctor's care. Please don't stop or change either one on your own. Just talk with your pharmacist or doctor so they can watch you closely, especially when you first start or when a dose goes up.
Interaction: Additive serotonergic activity and additive QT prolongation when sertraline (SSRI) is combined with trazodone (a serotonergic antidepressant).
- Direction: Both are active serotonergic agents (neither is a prodrug here); effects are additive, increasing risk of serotonin syndrome and ventricular arrhythmias including torsades.
- Severity/Evidence: Major; theoretical/pharmacodynamic basis.
- Onset: Unspecified; highest concern at initiation and dose escalation.
- Management: Avoid combination when possible. If coadministered, monitor for serotonin syndrome (clonus, hyperreflexia, autonomic instability, hyperthermia). Consider ECG/QT monitoring, especially with other QT risk factors. Discontinue serotonergic agents and give supportive care if serotonin syndrome is suspected.
What happens
Increased risk of serotonin syndrome and an increased risk of QT interval prolongation
Interaction Deep Dive
Combining sertraline with this medication should be avoided, because doing so can heighten the likelihood of serotonin syndrome, QT prolongation, and/or ventricular arrhythmias. When simultaneous use cannot be avoided, keep a close watch on patients for signs of serotonin syndrome, particularly when therapy is being started and when doses are raised. Should serotonin syndrome be suspected, stop sertraline along with any other serotonergic drugs right away and begin supportive care1.
Why it happens (mechanism)
Additive serotonergic effects; additive QT interval prolongation
How to manage this interaction
Your care team can manage this combination when it is truly needed. Here is what that usually looks like:
- Keep taking both as prescribed unless your prescriber tells you otherwise. Do not start or stop either one on your own.
- Your team may monitor you more closely, especially when starting either drug or raising a dose.
- They may check your heart rhythm (ECG) if you have other risks for QT problems.
- Doses may be adjusted and individualized by your team.
Call your doctor or seek urgent care if you notice agitation, confusion, rapid heartbeat, heavy sweating, shivering, muscle twitching, or fever.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Trazodone together?
Combining sertraline and trazodone can raise serotonin too much and stress the heart's rhythm, so it is often avoided; if you take both, keep taking them as prescribed and ask your pharmacist or doctor to monitor you, especially when starting or increasing a dose. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Trazodone 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 Trazodone interaction managed?
Your care team can manage this combination when it is truly needed. Here is what that usually looks like: Keep taking both as prescribed unless your prescriber tells you otherwise. Do not start or stop either one on your own. Your team may monitor you more closely, especially when starting either drug or raising a dose. They may check your heart rhythm (ECG) if you have other risks for QT problems… 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:
- Switching Between Generic Sertraline Brands: What to Know
- Is Ashwagandha Safe With Bupropion, Sertraline And Azelastine?
- Converting Doses Of Lexapro (Escitalopram) To Zoloft (Sertraline)
- NyQuil With Trazodone Interaction
- Help! Trazodone Is Not Working Well To Help Me Sleep
- Can Trazodone Cause A False-Positive For Amphetamines?
Questions for your pharmacist
- Does my dose of Sertraline or Trazodone 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 (1)
- Product Information: ZOLOFT oral tablets, oral solution, sertraline hydrochloride oral tablets, oral solution. Viatris Specialty LLC (per FDA), Morgantown, WV, 2023. DailyMed
Keep reading about Sertraline
Keep reading about Trazodone
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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