Sertraline and Efavirenz: 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
Efavirenz
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.
Taking efavirenz (an HIV medicine) together with sertraline (an antidepressant, sometimes sold as Zoloft) can work against your sertraline in two ways. First, efavirenz speeds up how fast your body breaks sertraline down, so the sertraline level in your blood drops. In one study it fell by roughly a third, which could make your antidepressant work less well.
Second, both medicines can slightly affect your heart's rhythm, and together that effect can add up. This sounds worrying, but it is very manageable. Please don't stop either medicine on your own. Talk with your doctor or pharmacist. They can adjust your sertraline dose based on how you feel and keep an eye on your heart.
Mechanism: Efavirenz induces CYP3A4, increasing sertraline metabolism and lowering exposure. Neither drug is a prodrug, so the net effect is reduced sertraline effect. Separately, both agents prolong the QT interval, producing additive cardiac risk.
- PK data: Efavirenz 600 mg/day with sertraline 50 mg/day reduced sertraline AUC ~39% and Cmax ~29% (13 healthy volunteers).
- Direction: Loss of antidepressant efficacy plus additive QTc prolongation / torsade risk.
- Evidence: Established. Severity: Major.
- Management: Titrate sertraline to clinical response; consider a non-QT-prolonging alternative to efavirenz. Monitor mood response and ECG/electrolytes when risk factors are present.
What happens
Reduced sertraline exposure and an increased risk of QT interval prolongation
Interaction Deep Dive
When efavirenz and sertraline are taken together, sertraline plasma levels can fall because efavirenz induces the CYP3A4 metabolism of sertraline. A pharmacokinetic study involving 13 healthy volunteers, in which efavirenz (600 mg daily) was given alongside sertraline (50 mg once daily), showed reductions in sertraline AUC and Cmax of 39% and 29%, respectively. The sertraline dose may need to be raised depending on the clinical response. Because additive QT interval effects2 and/or ventricular arrhythmias may result 1, it is worth considering alternatives to efavirenz whenever it is combined with a drug that prolongs the QT interval or carries a known risk of torsade de pointes, such as sertraline.
Why it happens (mechanism)
Induction of CYP3A4-mediated sertraline metabolism by efavirenz; additive QT interval prolongation
How to manage this interaction
This combination is manageable when your care team is aware of it. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your sertraline dose may need to be adjusted and individualized by your care team, because efavirenz can lower its levels. Let them know if your depression or anxiety symptoms return or worsen.
- Because both drugs can affect heart rhythm, your team may monitor you more closely (for example, an ECG or checking potassium and magnesium), especially if you have other heart-rhythm risk factors.
- In some cases they may consider an alternative to efavirenz.
Ask your pharmacist or doctor before making any change.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In a pharmacokinetic study involving 13 healthy volunteers, the co-administration of efavirenz (600 mg daily) and sertraline (50 mg once daily) produced reductions in sertraline's AUC and Cmax of 39% and 29% respectively 2.
Common questions
Can I take Sertraline and Efavirenz together?
Efavirenz can lower sertraline levels (possibly weakening its effect) and both drugs can add to QT prolongation, so your care team may adjust your sertraline dose and monitor your heart. Keep taking both as prescribed and raise any symptoms with your pharmacist or doctor. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Efavirenz 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 Efavirenz interaction managed?
This combination is manageable when your care team is aware of it. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your sertraline dose may need to be adjusted and individualized by your care team, because efavirenz can lower its levels. Let them know if your depression or anxiety symptoms return or worsen. Because both drugs can affect heart rhythm, yo… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "established". Well documented — supported by controlled studies or strong clinical data.
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 Efavirenz 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 (2)
- Product Information: ZOLOFT oral tablets, oral solution, sertraline hydrochloride oral tablets, oral solution. Viatris Specialty LLC (per FDA), Morgantown, WV, 2023. DailyMed
- Product Information: SUSTIVA(R) oral capsules, oral tablets, efavirenz oral capsules, oral tablets. Bristol-Myers Squibb Company (per FDA), Princeton, NJ, 2023. DailyMed
Keep reading about Efavirenz
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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