Fluconazole and Sertraline: 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
Fluconazole
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 fluconazole (an antifungal, brand name Diflucan) together with sertraline (an antidepressant). Fluconazole can slow down how your body breaks down sertraline, so more of it can build up in your system. On top of that, both medicines can affect the heart's rhythm by lengthening something called the QT interval. When they're combined, that heart-rhythm effect can add up, which is why this pairing is flagged as one to avoid.
Here's the reassuring part: this is based mostly on theory, and your pharmacist and doctor can manage it safely. Please don't stop either medicine on your own. Just let your care team know you take both so they can decide the best plan for you.
Effect: Fluconazole (moderate CYP3A4 inhibitor) may reduce sertraline clearance, increasing exposure, plus additive QT-interval prolongation risk. Neither drug is a prodrug, so inhibition increases sertraline's effect.
- Mechanism: CYP3A4 inhibition by fluconazole (sertraline is partly CYP3A4-metabolized); pharmacodynamic additive QTc prolongation.
- Severity: Contraindicated on file; evidence: theoretical.
- Onset: unspecified; inhibition persists 4 to 5 days post-discontinuation due to fluconazole's long half-life.
- Management: Assess baseline/periodic ECG (QTc) and electrolytes if co-use is unavoidable; consider an alternative antifungal or reassess antidepressant. Dose should be individualized by the care team.
What happens
Increased CYP3A4 substrate exposure and an increased risk of QT interval prolongation
Interaction Deep Dive
As a moderate inhibitor of CYP3A4, fluconazole carries the potential to lengthen the QT interval and provoke torsade de pointes. Combining it with CYP3A4 substrates recognized for prolonging the QT interval is contraindicated, since such pairing can raise the exposure of those CYP3A4 substrates. Owing to fluconazole's extended half-life, its inhibitory effect on CYP3A4 can persist for 4 to 5 days following discontinuation12.
Why it happens (mechanism)
Inhibition of CYP3A4-mediated metabolism by fluconazole; additive QT interval prolongation
How to manage this interaction
Your care team can handle this safely. Because this combination is flagged as one to avoid, they may take steps such as:
- Choosing a different antifungal or reassessing your antidepressant plan
- Monitoring you more closely, which can include heart-rhythm (ECG) checks
- Adjusting and individualizing doses to fit you
What you should do: keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise, and let your pharmacist or doctor know you take both. Also mention any dizziness, fainting, or fluttering heartbeat. Remember that fluconazole's effect can linger 4 to 5 days after stopping it.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
Common questions
Can I take Fluconazole and Sertraline together?
Combining fluconazole and sertraline can raise sertraline levels and add to heart-rhythm (QT) risk, so this pairing is one to avoid. Don't change anything on your own; talk with your pharmacist or doctor so they can pick a safer plan or monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Fluconazole and Sertraline 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 Fluconazole and Sertraline interaction managed?
Your care team can handle this safely. Because this combination is flagged as one to avoid, they may take steps such as: Choosing a different antifungal or reassessing your antidepressant plan Monitoring you more closely, which can include heart-rhythm (ECG) checks Adjusting and individualizing doses to fit you What you should do: keep taking both medicines exactly as prescribed unless your prescr… 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:
- Fluconazole Dosing For 'Intestinal Candida'
- Eliquis With Fluconazole Drug Interaction
- Can You Cut Or Split Fluconazole In Half?
- 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 Fluconazole or Sertraline 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: DIFLUCAN(R) oral tablets, suspension, fluconazole oral tablets, suspension. Roerig (per FDA), New York, NY, 2024. DailyMed
- Product Information: DIFLUCAN(R) intravenous injection, fluconazole intravenous injection. Roerig (per FDA), New York, NY, 2024. DailyMed
- Khazan M & Mathis AS: Probable cause of torsades de pointes induced by fluconazole. Pharmacotherapy 2002; 22(12):1632-1637.
- Wassmann S, Nickenig G, & Bohm M: Long QT syndrome and torsade de pointes in a patient receiving fluconazole. Ann Intern Med 1999; 131:797. PubMed
Keep reading about Fluconazole
Keep reading about Sertraline
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