Sertraline and Citalopram: 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
Citalopram
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.
Citalopram (Celexa) and sertraline are both antidepressants from the same family called SSRIs. Each one raises a brain chemical called serotonin. Taking them together can push serotonin too high, which may cause a problem called serotonin syndrome. Warning signs include agitation, a fast heartbeat, sweating, shaking, muscle twitching, or confusion.
Both drugs can also affect the heart's rhythm (a change called QT prolongation), and using them together can add to that. Doctors usually try to avoid combining these two. If your care team has you on both, that is something they can manage with close monitoring, so please talk with your pharmacist or doctor before making any changes.
Effect: Additive risk of serotonin syndrome and additive QT-interval prolongation (potential for ventricular arrhythmias) when two SSRIs are combined.
Mechanism (PD): Both citalopram and sertraline inhibit serotonin reuptake, producing additive serotonergic tone; both carry intrinsic QT-prolonging potential (citalopram notably dose-dependent).
- Direction: Additive/increased effect and toxicity.
- Onset: Unspecified; risk highest at initiation and dose escalation.
- Evidence: Theoretical.
- Management: Generally avoid coadministration. If necessary, monitor for serotonin syndrome and consider ECG/electrolyte surveillance. Discontinue serotonergic agents and give supportive care if serotonin syndrome is suspected.
What happens
Increased risk of serotonin syndrome and an increased risk of QT interval prolongation
Interaction Deep Dive
The combined use of sertraline with this drug should be avoided, since doing so can heighten the likelihood of serotonin syndrome, QT prolongation, and/or ventricular arrhythmias. Should combined use become unavoidable, keep patients under close observation for serotonin syndrome, particularly when therapy is being started and when doses are raised. If serotonin syndrome is suspected, stop sertraline together with any other serotonergic agents being given at once and begin supportive care1.
Why it happens (mechanism)
Additive serotonergic effects; additive QT interval prolongation
How to manage this interaction
Care teams generally avoid using citalopram and sertraline together, since both are SSRIs and the risks add up. If your prescriber decides you need both, here is what usually happens and what you can do:
- Your team may monitor you more closely, especially when starting either drug or raising a dose.
- They may watch your heart rhythm and adjust doses individually for you.
- Keep taking both exactly as prescribed unless your doctor tells you otherwise.
Call your pharmacist or prescriber promptly if you notice agitation, rapid heartbeat, sweating, shaking, muscle twitching, fever, or confusion. Do not start or stop either medicine on your own.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Citalopram together?
Citalopram and sertraline are both SSRIs, so combining them adds up serotonin and heart-rhythm risks and is usually avoided; if you are on both, keep taking them as prescribed and ask your pharmacist or doctor about closer monitoring. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Citalopram 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 Citalopram interaction managed?
Care teams generally avoid using citalopram and sertraline together, since both are SSRIs and the risks add up. If your prescriber decides you need both, here is what usually happens and what you can do: Your team may monitor you more closely, especially when starting either drug or raising a dose. They may watch your heart rhythm and adjust doses individually for you. Keep taking both exactly as… 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
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- Interaction Between Propranolol And Citalopram
- Switching Between Generic Sertraline Brands: What to Know
- Is Ashwagandha Safe With Bupropion, Sertraline And Azelastine?
- Converting Doses Of Lexapro (Escitalopram) To Zoloft (Sertraline)
Questions for your pharmacist
- Does my dose of Sertraline or Citalopram 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 Citalopram
Keep reading about Sertraline
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