Sertraline and Iloperidone: 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 recordIloperidone
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.
These two medicines can affect your heart in a similar way. Both sertraline (an antidepressant) and iloperidone (Fanapt, used for certain mental health conditions) can slightly lengthen a part of your heartbeat called the QT interval. Taking them together can add up and, in some people, raise the risk of an irregular heartbeat.
On top of that, sertraline slows down an enzyme (called CYP2D6) that your body uses to break down iloperidone. That means iloperidone can build up higher than expected, which can increase side effects. The good news is your care team knows how to handle this. They may adjust your iloperidone dose and check on your heart, so keep taking both exactly as prescribed and share any dizziness, fainting, or palpitations with them.
Effect: Increased risk of QTc prolongation and increased iloperidone exposure.
Mechanism: Two overlapping effects. (1) Additive QT prolongation, since both agents prolong the QTc interval. (2) Sertraline inhibits CYP2D6, reducing metabolism of iloperidone (a CYP2D6 substrate), raising its AUC/Cmax and its active metabolites. Neither is a prodrug here, so inhibition increases effect and toxicity risk.
Evidence: Probable; severity major; onset unspecified.
- Avoid concomitant use where possible.
- If combined, iloperidone dose may need reduction and individualization.
- Monitor ECG/QTc, electrolytes (K+, Mg2+), and for arrhythmia symptoms.
- Consider dose increase of iloperidone if sertraline is later discontinued.
What happens
Increased risk of QT interval prolongation and an increased CYP2D6 substrate exposure
Interaction Deep Dive
The combined administration of sertraline (which acts as both a CYP2D6 inhibitor and a QT interval prolonging agent) alongside CYP2D6 substrates that prolong the QT interval should be avoided. When drugs that also prolong the QTc interval are used together, the likelihood of QTc prolongation and/or ventricular arrhythmias rises. It may be necessary to lower the dose of the CYP2D6 substrate. On the other hand, should sertraline be stopped, a higher dose of the CYP2D6 substrate might be required1.
Why it happens (mechanism)
Additive QT interval prolongation; inhibition of CYP2D6-substrate metabolism by sertraline
How to manage this interaction
This combination is manageable with the right oversight. Here is what typically happens and what you can do:
- Keep taking both as prescribed unless your prescriber tells you otherwise. Do not stop or change doses on your own.
- Your care team may reduce your iloperidone dose and individualize it, since sertraline can raise iloperidone levels.
- They may monitor your heart more closely (for example with an ECG) and check electrolytes.
- Report fainting, dizziness, or a racing/irregular heartbeat right away.
- If sertraline is ever stopped, tell your prescriber, because your iloperidone dose may need to go back up.
Ask your pharmacist or doctor whether this combination is right for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Coadministration of PARoxetine 20 mg/day produced roughly 4-fold rises in the mean plasma concentrations of risperiDONE 4 to 8 mg/day (a CYP2D6 substrate) 2.
Common questions
Can I take Sertraline and Iloperidone together?
Sertraline and iloperidone can both prolong the QT interval, and sertraline can raise iloperidone levels, so this pairing is usually avoided or closely managed. Keep taking both as prescribed and ask your care team about dose adjustments and heart monitoring. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Iloperidone 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 Iloperidone interaction managed?
This combination is manageable with the right oversight. Here is what typically happens and what you can do: Keep taking both as prescribed unless your prescriber tells you otherwise. Do not stop or change doses on your own. Your care team may reduce your iloperidone dose and individualize it, since sertraline can raise iloperidone levels. They may monitor your heart more closely (for example with… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
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 Iloperidone 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 (2)
- Product Information: ZOLOFT oral tablets, oral solution, sertraline hydrochloride oral tablets, oral solution. Viatris Specialty LLC (per FDA), Morgantown, WV, 2023. DailyMed
- Product Information: PEXEVA(R) oral tablets, paroxetine mesylate oral tablets. Sebela Pharmaceuticals Inc (per FDA), Roswell, GA, 2023.
Keep reading about Sertraline
Keep reading about Iloperidone
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major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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