Sertraline and Eribulin: 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 recordEribulin
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 of these medicines can affect your heart's rhythm. Sertraline (an antidepressant) and eribulin (a chemotherapy medicine) can each stretch out a part of your heartbeat called the QT interval. When you take them together, that effect can add up, which may raise the chance of an irregular or unsafe heart rhythm.
This concern is based on how these drugs work rather than lots of real-world reports, but it is still taken seriously. The good news is that your cancer team and pharmacist can manage this by choosing the safest option for you and keeping a close eye on your heart. Please don't stop either medicine on your own, just talk with your care team first.
Effect: Additive QT-interval prolongation with increased risk of ventricular arrhythmias (including torsades de pointes) when sertraline is combined with eribulin.
Mechanism: Pharmacodynamic (additive), not PK-based. Both agents independently prolong the QT interval; neither is a prodrug relevant here.
- Direction: Additive PD effect (increased combined risk).
- Evidence: Theoretical; severity rated major.
- Onset: Unspecified.
- Management: Avoidance is the labeled recommendation. If coadministration is unavoidable, obtain baseline and follow-up ECGs, correct electrolytes (K+, Mg2+, Ca2+), review other QT-prolonging agents, and monitor for arrhythmia symptoms.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Do not use sertraline together with this medication, since combining them may raise the likelihood of QT prolongation and/or ventricular arrhythmias1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
The main strategy here is avoidance when possible. Because both drugs can prolong the QT interval, your care team may prefer an alternative to one of them.
- If both are needed, your team may monitor you more closely, including ECGs to check your heart rhythm.
- They may also check and correct blood minerals like potassium and magnesium, and review your other medicines for similar effects.
- Keep taking both exactly as prescribed unless your team tells you otherwise.
- Report any fainting, dizziness, palpitations, or an irregular heartbeat right away.
Ask your oncologist or pharmacist whether an alternative to sertraline is appropriate for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Eribulin together?
Sertraline and eribulin can both prolong the QT interval, so combining them may raise the risk of a dangerous heart rhythm; talk with your care team, who will usually avoid the combination or monitor your heart closely. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Eribulin 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 Eribulin interaction managed?
The main strategy here is avoidance when possible. Because both drugs can prolong the QT interval, your care team may prefer an alternative to one of them. If both are needed, your team may monitor you more closely, including ECGs to check your heart rhythm. They may also check and correct blood minerals like potassium and magnesium, and review your other medicines for similar effects. Keep taking… 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 Eribulin 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 Eribulin
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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