Sertraline and Clofazimine: 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
Clofazimine
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.
Clofazimine (a medicine used for certain infections like leprosy) and sertraline (an antidepressant) can each nudge the heart's electrical rhythm in the same direction. Doctors call this QT prolongation. When two medicines that do this are taken together, the effect can add up and, rarely, lead to an irregular heartbeat.
The good news is that this concern is mostly theoretical, and your care team can watch for it easily. Please keep taking both medicines exactly as prescribed, and check in with your pharmacist or doctor so they can decide if a heart tracing (ECG) is a good idea for you.
Interaction: Additive QT interval prolongation when clofazimine is combined with sertraline. Both agents carry QT-prolonging potential, so concurrent use may increase the risk of QTc prolongation and, rarely, torsades de pointes.
- Mechanism: Pharmacodynamic (additive), not a metabolic/prodrug interaction.
- Direction: Increased combined QT effect.
- Evidence: Theoretical; severity rated major.
- Onset: Unspecified.
- Management: Obtain baseline and follow-up ECGs, assess QTc, and correct/monitor electrolytes (K+, Mg2+). Watch for additional QT-prolonging agents.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
When clofazimine is given together with other agents that prolong the QT interval, ECG monitoring should be performed1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
This interaction can usually be managed safely by your care team. Here is what typically happens:
- Your doctor may order an ECG (a heart tracing) to check your heart rhythm before and during treatment.
- They may check your blood electrolytes (like potassium and magnesium), since low levels can add to the risk.
- Your doses may be adjusted and individualized by your team, and they may monitor you more closely.
What you can do: Keep taking both medicines as prescribed. Tell your pharmacist or prescriber about all your other medicines, and report symptoms like fainting, dizziness, or a fluttering heartbeat right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Clofazimine together?
Taking clofazimine and sertraline together can add to the risk of QT prolongation (an effect on heart rhythm), so let your care team know and they may check an ECG. Keep taking both as prescribed unless told otherwise. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Clofazimine 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 Clofazimine interaction managed?
This interaction can usually be managed safely by your care team. Here is what typically happens: Your doctor may order an ECG (a heart tracing) to check your heart rhythm before and during treatment. They may check your blood electrolytes (like potassium and magnesium), since low levels can add to the risk. Your doses may be adjusted and individualized by your team, and they may monitor you more… 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 Clofazimine 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: LAMPRENE(R) oral capsules, clofazimine oral capsules. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2019.
Keep reading about Clofazimine
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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