Sertraline and Arsenic Trioxide: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 11, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Sertraline
No brand names on recordArsenic Trioxide
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 sertraline (an antidepressant) and arsenic trioxide (a medicine used to treat certain leukemias) can each affect your heart's electrical rhythm in the same way. This effect is called QT prolongation. When two medicines that do this are taken together, the effect can add up and, rarely, lead to a dangerous irregular heartbeat.
This concern is based mostly on how these drugs work rather than on lots of real-world reports, but because it involves the heart, your care team takes it seriously. The good news is this is very manageable. Your doctor and pharmacist can check your heart rhythm and other lab values, and tailor your treatment to keep you safe. Please don't stop either medicine on your own, just talk with your care team.
Effect: Additive QT interval prolongation with increased risk of ventricular arrhythmias (including torsades de pointes) when sertraline and arsenic trioxide are combined.
Mechanism: Pharmacodynamic additive effect on cardiac repolarization. Both agents independently prolong the QT interval. Neither is a prodrug relevant to this interaction, so the effect is PD, not PK.
- Direction: Additive/increased QT risk
- Severity: Major
- Onset: Unspecified
- Evidence: Theoretical
Management: Avoid coadministration where possible. If used together, obtain baseline and periodic ECGs, monitor and correct electrolytes (K+, Mg2+, Ca2+), and review other QT-prolonging agents.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Because the combination may heighten the likelihood of QT prolongation and/or ventricular arrhythmias, sertraline and this drug should not be given together1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Because both medicines can affect your heart rhythm, your care team will decide the safest approach for you. Here is what that may look like:
- They may avoid using the two together when possible, or choose an alternative medicine.
- If both are needed, they may monitor you more closely, including heart tracings (ECGs) and blood tests for minerals like potassium and magnesium.
- Your doses may be adjusted and individualized by your care team.
What you should do: Keep taking both exactly as prescribed unless told otherwise, and let your pharmacist or doctor know about all your medicines. Report any fainting, dizziness, or a fluttering or pounding heartbeat right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Arsenic Trioxide together?
Sertraline and arsenic trioxide can each prolong the QT interval, and using them together may add up to raise the risk of a dangerous heart rhythm; your care team will usually avoid the combination or monitor you closely with ECGs and electrolyte checks. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Arsenic Trioxide 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 Arsenic Trioxide interaction managed?
Because both medicines can affect your heart rhythm, your care team will decide the safest approach for you. Here is what that may look like: They may avoid using the two together when possible, or choose an alternative medicine. If both are needed, they may monitor you more closely, including heart tracings (ECGs) and blood tests for minerals like potassium and magnesium. Your doses may be adjust… 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 Arsenic Trioxide 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 Arsenic Trioxide
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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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