Sertraline and Timolol: 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
Sertraline
No brand names on recordTimolol
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.
What's going on: Sertraline can slow down one of the liver enzymes (called CYP2D6) that helps clear timolol from your body. Timolol is a beta-blocker, and even the eye-drop form can be absorbed into your bloodstream. If timolol builds up, you might notice effects like a slower heart rate, low blood pressure, dizziness, or feeling more tired than usual.
The good news: This concern is mostly theoretical, meaning it's based on how the drugs work rather than lots of real-world reports. Your care team can manage it easily by adjusting your dose if needed and keeping an eye on how you feel. Please don't stop either medicine on your own, just check in with your pharmacist or doctor.
Mechanism: Sertraline is a moderate CYP2D6 inhibitor; timolol is a CYP2D6 substrate. Inhibition may reduce timolol clearance, increasing its systemic exposure (AUC/Cmax). Note this applies even to ophthalmic timolol given meaningful systemic absorption.
Direction: increased beta-blocker effect (bradycardia, hypotension, fatigue, possible bronchospasm in susceptible patients). Neither drug is a prodrug, so the effect is additive/exaggerated, not reduced.
- Evidence: theoretical; magnitude unquantified.
- Onset: unspecified.
- Management: monitor HR and BP; reduce timolol dose as clinically necessary. On sertraline discontinuation, timolol dose may need upward adjustment.
What happens
Increased CYP2D6 substrate exposure
Interaction Deep Dive
When sertraline, which inhibits CYP2D6, is taken alongside a substrate of CYP2D6, the substrate's exposure may rise. Should coadministration be necessary, decrease the dose of the CYP2D6 substrate as appropriate; on the other hand, discontinuing 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
Keep taking both as prescribed unless your care team tells you otherwise. This is a manageable situation.
- Your team may monitor you more closely, for example checking heart rate and blood pressure.
- The timolol dose may need to be adjusted and individualized by your care team while you are on sertraline.
- If sertraline is ever stopped, your timolol dose may need to be increased again, so let your team guide any changes.
What to raise: Tell your pharmacist or prescriber if you feel dizzy, unusually tired, faint, or notice a slow heartbeat.
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 given at 20 mg once daily to steady-state, PARoxetine raised the Cmax, AUC, and t(1/2) of a single 100 mg dose of desipramine by roughly 2-, 5-, and 3-fold, respectively. Among patients stabilized on risperiDONE 4 to 8 mg/day, daily PARoxetine 20 mg increased mean plasma risperiDONE 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 with concurrent PARoxetine than with atomoxetine given alone. Mean digoxin steady-state AUC fell by 15% when PARoxetine was present. In a study using propranolol 80 mg twice daily over 18 days, the steady-state plasma concentrations of propranolol remained unchanged during coadministration with PARoxetine 30 mg once daily for the final 10 days 2.
Common questions
Can I take Sertraline and Timolol together?
Sertraline may raise timolol levels and strengthen its beta-blocker effects, so watch for dizziness or a slow heart rate and let your care team adjust the dose and monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Timolol 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 Timolol interaction managed?
Keep taking both as prescribed unless your care team tells you otherwise. This is a manageable situation. Your team may monitor you more closely, for example checking heart rate and blood pressure. The timolol dose may need to be adjusted and individualized by your care team while you are on sertraline. If sertraline is ever stopped, your timolol dose may need to be increased again, so let your te… 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 Sertraline or Timolol 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 Sertraline
Keep reading about Timolol
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