Sertraline and Fluoxetine Interaction
Drug interaction information between Sertraline and Fluoxetine.
Sertraline and Fluoxetine have a documented minor interaction in FDA labeling.
FDA drug labeling documents a minor-severity interaction between Sertraline and Fluoxetine. Major interactions are generally avoided, moderate ones may need monitoring or a dose adjustment, and minor ones are usually low-risk. This page shows the documented mechanism and guidance. Label-documented interactions are not a complete safety review, so always confirm your own medications with a pharmacist or doctor. Educational information, not medical advice.
How They Interact
Both medications increase serotonin levels in the brain, which can lead to an additive effect when taken together.
What To Do
Your doctor should monitor you closely for any signs of too much serotonin if these drugs are used at the same time.
FDA Label Information
If concomitant treatment with sumatriptan and an SSRI (e.g., citalopram, fluoxetine, fluvoxamine, paroxetine, sertraline) is clinically warranted, appropriate observation of the patient is advised.
Sertraline Also Interacts With
- Clonazepam major
- Aspirin moderate
- Phenelzine moderate
- Citalopram minor
- Paroxetine minor
Fluoxetine Also Interacts With
- Aspirin major
- Warfarin major
- Olanzapine major
- Pimozide major
- Thioridazine major
Frequently Asked Questions
Can I take Sertraline and Fluoxetine together?
This is a minor interaction. Your doctor should monitor you closely for any signs of too much serotonin if these drugs are used at the same time.
How serious is the interaction between Sertraline and Fluoxetine?
This interaction is classified as "minor" severity by the FDA. Minor interactions are unlikely to cause significant problems but should still be mentioned to your healthcare provider.
Why do Sertraline and Fluoxetine interact?
Both medications increase serotonin levels in the brain, which can lead to an additive effect when taken together.
Understanding the Sertraline and Fluoxetine Interaction
FDA-approved prescribing information for these two drugs flags their combination as a minor-severity interaction. Sertraline belongs to the Selective Serotonin Reuptake Inhibitor (SSRI) class and Fluoxetine belongs to the Selective Serotonin Reuptake Inhibitor (SSRI) class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Both medications increase serotonin levels in the brain, which can lead to an additive effect when taken together. Severity tiers matter: major flags generally advise avoidance, moderate flags often require monitoring or dose adjustment, and minor flags may only call for awareness.
Context around a specific patient determines real-world impact. Sertraline has 34 total documented interactions on file in this dataset, and Fluoxetine has 68. Each additional medication compounds the interaction surface, which is why pharmacists run full-profile checks rather than evaluating one pair at a time. FDA-derived guidance for this pair is: Your doctor should monitor you closely for any signs of too much serotonin if these drugs are used at the same time. Timing of doses, renal and hepatic function, age, and other concurrent prescriptions all shape whether a labeled interaction matters clinically.
An interaction flag is not a verdict. A large share of labeled interactions are managed routinely in clinical practice, the fix may be as simple as spacing doses or adding a monitoring test. Others require the prescriber to choose a different medication entirely. This page surfaces FDA-sourced labeling and openFDA data for educational purposes only; it is not medical advice and cannot account for your full clinical picture. Never start, stop, or adjust either Sertraline or Fluoxetine based on a web page, speak with your prescriber or pharmacist before making any change.
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. Always consult your healthcare provider about drug interactions.
Read our methodology - how this data is sourced, computed, and verified.