Sertraline and Erythromycin: 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
Erythromycin
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.
Let's talk about taking erythromycin (an antibiotic) together with sertraline (an antidepressant). Two things can happen. First, both medicines can slightly affect your heart's rhythm, and using them together may add up and raise the risk of an irregular heartbeat. Second, erythromycin can slow down how your body breaks down sertraline, so more of it can build up. That could mean stronger sertraline side effects like nausea, jitteriness, or trouble sleeping.
The good news is that this is manageable. Please don't stop either medicine on your own. Just check in with your pharmacist or doctor so they can adjust things and keep an eye on you.
Effect: Combined use may cause additive QT prolongation and increased sertraline exposure with heightened adverse effects.
- Mechanism: Additive QTc prolongation (both agents), plus erythromycin's CYP3A4 inhibition reducing metabolism of sertraline (a CYP3A4 substrate), raising its exposure. Neither is activation-dependent here, so the direction is increased sertraline effect.
- Severity/Evidence: Major; theoretical.
- Onset: Unspecified.
- Management: Avoid coadministration where possible. If used together, consider dose adjustment, monitor for serotonergic/adverse effects, and obtain baseline and follow-up ECG plus electrolytes (K+, Mg2+). Assess other QT-prolonging agents and bradycardia risk.
What happens
An increased risk of QT interval prolongation, an increased sertraline exposure and an increased risk of sertraline-related adverse effects
Interaction Deep Dive
Combining sertraline with erythromycin, an agent that prolongs the QT interval, should be avoided because it can heighten the likelihood of QT prolongation and/or ventricular arrhythmias1. Because sertraline is a CYP3A4 substrate, taking it together with erythromycin may also raise sertraline exposure, which could intensify or extend both its therapeutic and adverse effects. In patients receiving erythromycin at the same time, dosage modifications should be considered and, where feasible, sertraline drug concentrations should be closely monitored234.
Why it happens (mechanism)
Additive QT interval prolongation; inhibition of CYP3A4-substrate metabolism of sertraline
How to manage this interaction
Both drugs can nudge your heart rhythm, and erythromycin can raise sertraline levels in your body, so your care team pays extra attention here.
- Keep taking both as prescribed unless your prescriber tells you otherwise.
- Your team may choose a different antibiotic when one is available, since avoiding the combination is preferred.
- If you do use them together, the sertraline dose may be adjusted and individualized, and your team may monitor you more closely (including possible heart tracing/ECG and sertraline effects).
- Tell your pharmacist or doctor about any dizziness, fainting, palpitations, or new sertraline side effects.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Erythromycin together?
Combining erythromycin and sertraline can add up on heart-rhythm risk and raise sertraline levels, so this pairing is usually avoided when possible. Keep taking both as prescribed and check with your pharmacist or doctor, who can adjust the dose and monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Erythromycin 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 Erythromycin interaction managed?
Both drugs can nudge your heart rhythm, and erythromycin can raise sertraline levels in your body, so your care team pays extra attention here. Keep taking both as prescribed unless your prescriber tells you otherwise. Your team may choose a different antibiotic when one is available, since avoiding the combination is preferred. If you do use them together, the sertraline dose may be adjusted and… 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 Erythromycin 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 (4)
- Product Information: ZOLOFT oral tablets, oral solution, sertraline hydrochloride oral tablets, oral solution. Viatris Specialty LLC (per FDA), Morgantown, WV, 2023. DailyMed
- Product Information: Erythromycin Lactobionate IV injection lyophilized powder for solution, erythromycin lactobionate IV injection lyophilized powder for solution. Nexus Pharmaceuticals (per DailyMed), Lincolnshire, IL, 2024.
- Product Information: Erythromycin oral delayed-release capsules, erythromycin oral delayed-release capsules. Dr. Reddy's Laboratories Inc. (per DailyMed), Princeton, NJ, 2025. DailyMed
- Product Information: ERYTHROMYCIN ETHYLSUCCINATE oral suspension granule, erythromycin ethylsuccinate oral suspension granule. ANI Pharmaceuticals, Inc (per DailyMed), Baudette, MN, 2025. DailyMed
Keep reading about Erythromycin
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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