Sertraline and Mobocertinib: 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
Mobocertinib
Sertraline
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.
You've been prescribed mobocertinib (a cancer medicine) and sertraline (an antidepressant). Both drugs can affect the timing of your heartbeat, something doctors call the QT interval. When two medicines that do this are taken together, that effect can add up and, in rare cases, lead to a dangerous irregular heart rhythm.
This concern is based mostly on how the drugs work rather than lots of real-world reports, but it's still worth taking seriously. Please don't stop either medicine on your own. Talk with your pharmacist or doctor. Your care team can watch your heart with an EKG and keep you safe while you take these.
Effect: Additive QTc prolongation, with theoretical increased risk of torsades de pointes.
Mechanism: Both agents independently prolong the QTc interval; the interaction is pharmacodynamic (additive), not metabolic. Neither drug's activation is relevant here.
- Direction: Additive QT prolongation (enhanced arrhythmic risk).
- Evidence: Theoretical; severity rated major.
- Onset: Unspecified.
- Management: Avoid concomitant use where possible. If unavoidable, obtain baseline and periodic ECGs, monitor QTc, and check/correct electrolytes (K+, Mg2+). Consider an antidepressant with lower QT liability if clinically appropriate.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Using mobocertinib together with agents recognized for extending the corrected QT (QTc) interval may heighten the likelihood of QTc prolongation, including torsades de pointes, a condition that can prove fatal. Concurrent administration of other drugs known to lengthen the QTc interval alongside mobocertinib should be avoided. When such combined use cannot be prevented, increase the frequency of QTc interval monitoring through ECGs1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Here is how a care team usually handles this combination:
- Keep taking both exactly as prescribed unless your doctor tells you otherwise.
- Your team may avoid using them together if there's a safer option, or if both are needed, they may check your heart with EKGs more often.
- They may also review your potassium and magnesium levels, since low levels can add to the risk.
Tell your pharmacist or prescriber if you feel fainting, dizziness, palpitations, or a fluttering heartbeat. Also mention any other medicines you take, since some of those can affect heart rhythm too.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Mobocertinib together?
Both mobocertinib and sertraline can prolong the QT interval, so together they may raise the risk of a dangerous heart rhythm. Don't change anything yourself; ask your care team whether to avoid the combination or monitor you with EKGs. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Mobocertinib 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 Mobocertinib interaction managed?
Here is how a care team usually handles this combination: Keep taking both exactly as prescribed unless your doctor tells you otherwise. Your team may avoid using them together if there's a safer option, or if both are needed, they may check your heart with EKGs more often. They may also review your potassium and magnesium levels, since low levels can add to the risk. Tell your pharmacist or presc… 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 Mobocertinib 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: EXKIVITY(TM) oral capsules, mobocertinib oral capsules. Takeda Pharmaceuticals America Inc (per FDA), Lexington, MA, 2021.
Keep reading about Mobocertinib
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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