Sertraline and Mesoridazine: 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
Mesoridazine
No brand names on recordSertraline
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.
Both of these medicines can affect your heart's rhythm. Mesoridazine is an older antipsychotic, and sertraline is a common antidepressant. Each one can slightly stretch out the timing of your heartbeat (something doctors call the QT interval). When they are taken together, that effect can add up and raise the risk of a dangerous irregular heartbeat.
Because of this, using these two together is generally not recommended. Please don't stop either medicine on your own. Instead, talk with your pharmacist or doctor. They can review your heart health and choose a safer combination or monitor you closely to keep you protected.
Interaction: Additive QT-interval prolongation with combined mesoridazine (a phenothiazine antipsychotic) and sertraline (an SSRI).
- Mechanism: Pharmacodynamic, additive delay of cardiac repolarization; not primarily a metabolic/PK interaction. Neither is a prodrug relevant here.
- Direction/risk: Increased risk of QTc prolongation and torsades de pointes / ventricular arrhythmias.
- Severity: Contraindicated per labeling.
- Evidence: Theoretical / mechanistic.
- Management: Avoid concomitant use. If unavoidable, obtain baseline and follow-up ECG, monitor electrolytes (K+, Mg2+), and consider an alternative agent.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Because giving mesoridazine together with medications known to prolong the QT interval can heighten the likelihood of QT prolongation and serious ventricular arrhythmias, such combined use is contraindicated1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
The safest approach here is usually to avoid taking these two together, since combining them can add to the effect on your heart rhythm.
- Keep taking both as prescribed for now and do not stop either one on your own.
- Ask your pharmacist or prescriber to review this combination. They may switch one medicine to a safer alternative.
- If both are truly needed, your team may check an ECG and your electrolytes and monitor you more closely.
- Report symptoms like 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 Mesoridazine together?
Mesoridazine and sertraline can each stretch the heart's QT interval, and together the risk of a dangerous arrhythmia goes up, so this combination is generally avoided. Do not stop either drug on your own; ask your doctor or pharmacist to review it. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Mesoridazine interaction?
It is rated contraindicated. These should generally not be used together.
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 Mesoridazine interaction managed?
The safest approach here is usually to avoid taking these two together, since combining them can add to the effect on your heart rhythm. Keep taking both as prescribed for now and do not stop either one on your own. Ask your pharmacist or prescriber to review this combination. They may switch one medicine to a safer alternative. If both are truly needed, your team may check an ECG and your electro… 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 Mesoridazine 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: SERENTIL(R) oral tablets, injection, oral solution, mesoridazine besylate oral tablets, injection, oral solution. Boehringer Ingelheim Pharmaceuticals,Inc, Ridgefield, CT, 2001.
Keep reading about Mesoridazine
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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