Darifenacin 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
Darifenacin
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.
Here is what is going on. Darifenacin (Enablex) is broken down partly by a liver enzyme called CYP2D6. Sertraline can slow that enzyme down. When the enzyme works slower, darifenacin can build up in your body a little more than usual. That could make its typical side effects stronger, like dry mouth, constipation, blurry vision, or feeling lightheaded.
The good news: this is based on how the drugs work in theory, not on strong real-world reports. Many people take combinations like this safely. Your care team can manage it by adjusting your dose if needed and keeping an eye on how you feel. Please do not change anything on your own, just check in with your pharmacist or doctor.
Mechanism: Sertraline is a moderate CYP2D6 inhibitor; darifenacin is a CYP2D6 (and CYP3A4) substrate. Inhibition may reduce darifenacin clearance and increase its exposure (AUC/Cmax).
Direction: Increased darifenacin effect, so heightened antimuscarinic adverse effects (dry mouth, constipation, blurred vision, urinary retention, CNS effects).
- Evidence: theoretical; severity rated major.
- Onset: unspecified.
- Management: if coadministered, reduce darifenacin dose as needed and monitor for anticholinergic toxicity; on sertraline discontinuation, a darifenacin dose increase may be warranted. Dose should be individualized by the care team.
What happens
Increased CYP2D6 substrate exposure
Interaction Deep Dive
When sertraline (which inhibits CYP2D6) is taken together with a CYP2D6 substrate, exposure to that substrate may rise. Should the two agents need to be given together, lower the CYP2D6 substrate dose as required; on the other hand, stopping sertraline may call for raising the dose of a CYP2D6 substrate1.
Why it happens (mechanism)
Inhibition of CYP2D6 substrate metabolism by sertraline
How to manage this interaction
What your care team may do:
- Keep both medications if they are both needed, but the darifenacin dose may be lowered and individualized to account for the higher exposure.
- Watch you more closely for anticholinergic effects such as dry mouth, constipation, blurred vision, or trouble urinating.
- If sertraline is later stopped, your darifenacin dose may need to be raised again.
What you should do: Keep taking both exactly as prescribed. Do not adjust or stop either drug on your own. Tell your pharmacist or prescriber if you notice new or stronger side effects, and mention any planned changes to your sertraline.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) Within drug interaction investigations, PARoxetine produced the following effects on agents metabolized by CYP2D6. When PARoxetine 20 mg once daily was at steady-state, it raised the Cmax, AUC, and t(1/2) of a single 100 mg dose of desipramine by roughly 2-, 5-, and 3-fold, respectively. In patients who were stable on risperiDONE 4 to 8 mg/day, PARoxetine 20 mg daily raised mean risperiDONE plasma concentrations by 4-fold, lowered 9-hydroxyrisperiDONE concentrations by 10%, and raised concentrations of the active moiety by 1.4-fold. In healthy volunteers classified as extensive CYP2D6 metabolizers, steady-state atomoxetine AUC values were 6- to 8-fold greater and Cmax values were 3- to 4-fold greater when PARoxetine was given concurrently compared with atomoxetine alone. Mean digoxin steady-state AUC fell by 15% when PARoxetine was present. In a study using propranolol 80 mg twice daily for 18 days, the steady-state plasma concentrations of propranolol remained unchanged during coadministration with PARoxetine 30 mg once daily over the last 10 days 2.
Common questions
Can I take Darifenacin and Sertraline together?
Sertraline can slow the breakdown of darifenacin, so its side effects may be stronger; your care team can manage this by adjusting the darifenacin dose and monitoring you. Keep taking both as prescribed and report any new side effects. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Darifenacin and Sertraline 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 Darifenacin and Sertraline interaction managed?
What your care team may do: Keep both medications if they are both needed, but the darifenacin dose may be lowered and individualized to account for the higher exposure. Watch you more closely for anticholinergic effects such as dry mouth, constipation, blurred vision, or trouble urinating. If sertraline is later stopped, your darifenacin dose may need to be raised again. What you should do: Keep… 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 Darifenacin 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 (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: PEXEVA(R) oral tablets, paroxetine mesylate oral tablets. Sebela Pharmaceuticals Inc (per FDA), Roswell, GA, 2023.
Keep reading about Darifenacin
Keep reading about Sertraline
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