Sertraline and Levomilnacipran: 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
Levomilnacipran
No brand names on recordSertraline
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.
Both levomilnacipran and sertraline are antidepressants that raise serotonin, a chemical messenger in your brain. Taking them together means more serotonin activity, which can sometimes build up too much. This can lead to a rare but serious problem called serotonin syndrome.
Watch for things like agitation, a fast heartbeat, sweating, shivering, muscle twitching or stiffness, fever, or confusion. If those come on, get medical help right away. The good news is your care team knows about this combination, and they can watch you closely and adjust things if needed. Please don't stop either medicine on your own, just talk with your pharmacist or doctor if you have questions.
Effect: Additive serotonergic activity increases the risk of serotonin syndrome. Levomilnacipran (SNRI) and sertraline (SSRI) both raise synaptic serotonin, so this is a pharmacodynamic, not pharmacokinetic, interaction. Neither is a prodrug relevant here.
- Direction: Additive serotonergic effect (increased effect).
- Severity: Major; evidence: theoretical.
- Onset: Unspecified; can occur early after initiation or dose increase.
- Management: Use extreme caution. Monitor for autonomic instability, neuromuscular signs (clonus, hyperreflexia, rigidity), and mental status changes. If serotonin syndrome develops, discontinue both agents and provide supportive care.
What happens
An increased risk of serotonin syndrome
Interaction Deep Dive
Because levomilnacipran acts on the serotonergic system, combining it with any other medication that influences serotonergic neurotransmission may raise the likelihood of serotonin syndrome, a condition that can be life-threatening, so such combinations warrant extreme caution. Every patient receiving levomilnacipran alongside additional serotonergic agents should be watched for signs that serotonin syndrome is developing. Should serotonin syndrome occur, both drugs should be stopped and supportive symptomatic treatment begun. When there is a clinical justification for using levomilnacipran together with other serotonergic drugs, patients should be advised of the heightened serotonin syndrome risk and monitored for symptoms1.
Why it happens (mechanism)
Additive serotonergic effects
How to manage this interaction
Your care team can manage this combination safely with awareness and monitoring.
- Keep taking both as prescribed unless your prescriber tells you otherwise.
- Your team may monitor you more closely, especially when starting either drug or raising a dose.
- Doses may need to be adjusted and individualized by your care team.
- Learn the warning signs: agitation, rapid heartbeat, high blood pressure, sweating, shivering, tremor, muscle twitching or stiffness, fever, or confusion.
Seek medical help promptly if these symptoms appear, and ask your pharmacist or doctor about any new medicines or supplements, since some can add to serotonin effects.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Levomilnacipran together?
Levomilnacipran and sertraline both raise serotonin, so together they modestly increase the risk of serotonin syndrome; keep taking both as prescribed, watch for symptoms like agitation, fast heartbeat, sweating, tremor, or confusion, and get help right away if they appear. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Levomilnacipran 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 Levomilnacipran interaction managed?
Your care team can manage this combination safely with awareness and monitoring. Keep taking both as prescribed unless your prescriber tells you otherwise. Your team may monitor you more closely, especially when starting either drug or raising a dose. Doses may need to be adjusted and individualized by your care team. Learn the warning signs: agitation, rapid heartbeat, high blood pressure, sweati… 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 Levomilnacipran 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: FETZIMA(R) oral extended-release capsules, levomilnacipran oral extended-release capsules. AbbVie Inc (per FDA), North Chicago, IL, 2023. DailyMed
Keep reading about Levomilnacipran
Keep reading about Sertraline
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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