Drug Interaction Report

Sertraline and Morphine: Interaction Details

A pharmacist-reviewed analysis of the Sertraline and Morphine interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Morphine

No brand names on record
+

Sertraline

No brand names on record
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Jul 2, 2026
Editorial policy · Data sources
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Interaction severity
Major
Potentially serious — often needs a change or close monitoring.
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.

Of 532 documented Sertraline interactions, 477 are rated major — including this one.
Worried about symptoms right now? Contact your pharmacist or prescriber, or call Poison Control at 1-800-222-1222 (US). Call 911 for an emergency.
At a glance + Theoretical Effects may be stronger
The Bottom Line
Morphine plus sertraline can add up to raise serotonin and, rarely, cause serotonin syndrome; keep taking both as prescribed but watch for agitation, fast heartbeat, sweating, tremor, or confusion, especially when starting or changing doses.

Both of these medicines can raise serotonin, a chemical in your body. Sertraline is an antidepressant that boosts serotonin on purpose. Morphine, a strong pain medicine, can add to that effect. When serotonin gets too high, some people develop a reaction called serotonin syndrome. Signs can include feeling agitated or shaky, a fast heartbeat, sweating, muscle twitching, or confusion.

The good news: this is uncommon, and it's based more on theory than on lots of real cases. Your care team can manage it by watching you closely, especially when you first start or change a dose. Keep taking both as prescribed, and call your doctor right away if you notice those symptoms.

Effect: Additive serotonergic activity may increase the risk of serotonin syndrome when morphine is combined with sertraline (an SSRI).

Mechanism: Pharmacodynamic (additive), not a metabolic/PK interaction. Neither agent's effect here depends on prodrug activation.

Evidence: Theoretical; severity rated major. Onset unspecified.

  • Observe closely, particularly at initiation and dose titration of either drug.
  • Monitor for agitation, hyperthermia, tachycardia, diaphoresis, clonus, hyperreflexia, mental status changes.
  • If serotonin syndrome is suspected, discontinue morphine and provide supportive care.
Onset
unspecified
Evidence
theoretical
Severity
Major

What happens

Increased risk of serotonin syndrome

Interaction Deep Dive

Serotonin syndrome has been reported when opioids like morphine are taken together with serotonergic agents. When such combined therapy is required, monitor the patient closely, especially when starting treatment and when doses are being modified. Should serotonin syndrome be suspected, stop morphine12345678.

Why it happens (mechanism)

Additive serotonergic effects

How to manage this interaction

Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This combination can be used safely with the right attention.

Here is what your care team typically does:

  • Watches you more closely, especially when either medicine is started or the dose is changed.
  • Checks for symptoms of serotonin syndrome.
  • May stop morphine if serotonin syndrome is suspected.

What you can do: Tell your pharmacist or doctor about any agitation, rapid heartbeat, heavy sweating, tremor, muscle twitching, or confusion. Seek help promptly if these appear.

Management is individual — confirm any change with your pharmacist or prescriber.

Literature reports

1 report — tap to read

a) Instances of serotonin syndrome, a condition that can be life-threatening, have been documented when opioids are used together with serotonergic agents 345.

Common questions

Can I take Sertraline and Morphine together?

Morphine plus sertraline can add up to raise serotonin and, rarely, cause serotonin syndrome; keep taking both as prescribed but watch for agitation, fast heartbeat, sweating, tremor, or confusion, especially when starting or changing doses. Always confirm with your pharmacist or prescriber before making any change.

How serious is the Sertraline and Morphine 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 Morphine interaction managed?

Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This combination can be used safely with the right attention. Here is what your care team typically does: Watches you more closely, especially when either medicine is started or the dose is changed. Checks for symptoms of serotonin syndrome. May stop morphine if serotonin syndrome is suspected. What you can do: 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.

Questions for your pharmacist

  • Does my dose of Sertraline or Morphine 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 (8)

  1. Product Information: ARYMO(TM) ER oral extended-release tablets, morphine sulfate oral extended-release tablets. Egalet US Inc (per manufacturer), Wayne, PA, 2017. DailyMed
  2. Product Information: KADIAN(R) oral extended-release capsules, morphine sulfate oral extended-release capsules. Allergan USA, Inc (per FDA), Madison, NJ, 2019. DailyMed
  3. Product Information: DURAMORPH intravenous, epidural, intrathecal injection, morphine sulfate intravenous, epidural, intrathecal injection. Hikma Pharmaceuticals USA Inc (Per FDA), Berkeley, NJ, 2023. DailyMed
  4. Product Information: MS CONTIN(R) oral extended-release tablets, morphine sulfate oral extended-release tablets. Purdue Pharma LP (per FDA), Stamford, CT, 2023. DailyMed
  5. Product Information: Morphine sulfate oral solution, morphine sulfate oral solution. Hikma Pharmaceuticals USA Inc (per FDA), Berkeley Heights, NJ, 2023. DailyMed
  6. Product Information: Morphine sulfate oral tablets, morphine sulfate oral tablets. Hikma Pharmaceuticals USA Inc.(Per FDA), Berkeley, NJ, 2023. DailyMed
  7. Product Information: INFUMORPH intrathecal, epidural injection, morphine sulfate intrathecal, epidural injection. Hikma Pharmaceuticals USA Inc (per FDA), Berkeley Heights, NJ, 2023. DailyMed
  8. Product Information: Morphine sulfate intravenous injection, morphine sulfate intravenous injection. Mallinckrodt Inc (Per FDA), St. Louis, MO, 2023. DailyMed
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Morphine

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Beyond drug–drug

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:

Sertraline + Activated Charcoal American Hellebore Arsenic Cesium Ephedra Grapefruit Lithium Sida Cordifolia + 180 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

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This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.