Sertraline and Tacrolimus: 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 recordTacrolimus
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 tacrolimus (a medicine that quiets the immune system, often after a transplant) can each have a small effect on your heart's electrical rhythm, something called QT prolongation. When two medicines that do this are taken together, that effect can add up and, rarely, lead to an abnormal heartbeat.
I want to be honest that this concern is mostly based on theory, not on lots of real-world reports with these two drugs together. Still, it's worth a conversation. Please don't stop either medicine on your own. Your care team can check whether this combination is right for you and keep an eye on your heart if needed.
Effect: Additive risk of QT interval prolongation and potential ventricular arrhythmias (e.g., torsades de pointes) when sertraline and tacrolimus are combined.
Mechanism: Pharmacodynamic (additive QT effect); this is not a metabolic interaction and neither agent is a prodrug here.
Evidence: Theoretical. Severity on file: major. Onset: unspecified.
Management:
- Documented guidance is to avoid coadministration.
- If used together, obtain baseline and follow-up ECG, monitor QTc.
- Correct electrolytes (K+, Mg2+, Ca2+).
- Review concomitant QT-prolonging agents and tacrolimus levels per protocol.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Sertraline should not be taken together with this drug, because such a combination could heighten the likelihood of QT prolongation and/or ventricular arrhythmias1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
The information on file advises avoiding this combination when possible because the QT effects can add together. That decision belongs to your care team, so here is how to work with them:
- Keep taking both medicines as prescribed unless your doctor or pharmacist tells you otherwise.
- Ask whether an alternative to one of the drugs might be appropriate for you.
- Your team may check your heart rhythm (ECG) and blood electrolytes, and doses may be adjusted and individualized to you.
- Report fainting, dizziness, or a pounding or irregular heartbeat right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Tacrolimus together?
Sertraline and tacrolimus can each affect heart rhythm, so combining them may add to the risk of QT prolongation; the guidance is to avoid using them together when possible. Don't change anything on your own, ask your care team whether the combination is right for you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Tacrolimus 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 Tacrolimus interaction managed?
The information on file advises avoiding this combination when possible because the QT effects can add together. That decision belongs to your care team, so here is how to work with them: Keep taking both medicines as prescribed unless your doctor or pharmacist tells you otherwise. Ask whether an alternative to one of the drugs might be appropriate for you. Your team may check your heart rhythm (E… 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 Tacrolimus 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 Tacrolimus
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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