Sertraline and Telithromycin: 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 recordTelithromycin
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 sertraline (an antidepressant) and telithromycin (an antibiotic) can each affect your heart's electrical timing in a small way. This is measured on an EKG as the QT interval. When you take them together, the effects can add up, which may slightly raise the chance of an irregular heartbeat.
The good news is that this concern is mostly theoretical, meaning it is based on how the drugs work rather than lots of real-world problems. Please don't stop either medicine on your own. Talk with your pharmacist or doctor. They can check whether these two are the best choice for you or watch your heart more closely if you take both.
Effect: Additive QT interval prolongation with increased risk of ventricular arrhythmias (including torsades de pointes) when sertraline and telithromycin are combined.
- Mechanism: Additive pharmacodynamic QT prolongation; both agents independently prolong cardiac repolarization. Neither is a prodrug relevant here.
- Direction: Increased combined QT effect (PD additive).
- Evidence: Theoretical; severity rated major. Onset unspecified.
- Management: Manufacturer guidance is to avoid coadministration. If unavoidable, obtain baseline and follow-up ECG, correct electrolytes (K+, Mg2+), review other QT-prolonging agents, and monitor closely.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Sertraline should not be given together with this drug, since combining them may raise the likelihood of QT prolongation and/or ventricular arrhythmias1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Keep taking both medicines exactly as prescribed until you speak with your care team. Because both can lengthen the QT interval, the usual approach is:
- Your prescriber may consider whether an alternative antibiotic or antidepressant is a better fit for you.
- If both are needed, your team may monitor you more closely, including an EKG and blood tests to check electrolytes.
Let your pharmacist or doctor know about any other QT-affecting medicines you take. Get urgent help if you feel fainting, a racing or irregular heartbeat, or lightheadedness.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Telithromycin together?
Combining sertraline and telithromycin can add to QT prolongation and raise arrhythmia risk, so this pairing is generally avoided. Do not stop either drug on your own; ask your pharmacist or doctor whether an alternative or closer monitoring is right for you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Telithromycin 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 Telithromycin interaction managed?
Keep taking both medicines exactly as prescribed until you speak with your care team. Because both can lengthen the QT interval, the usual approach is: Your prescriber may consider whether an alternative antibiotic or antidepressant is a better fit for you. If both are needed, your team may monitor you more closely, including an EKG and blood tests to check electrolytes. Let your pharmacist or doc… 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 Telithromycin 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 Telithromycin
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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