Sertraline and Paregoric: 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
Paregoric
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.
Paregoric is a liquid opioid medicine (it contains a form of morphine) that's used to slow down diarrhea. Sertraline is an antidepressant that raises a brain chemical called serotonin. Some opioids can nudge serotonin up too, so taking both together could, in theory, push serotonin too high. That rare problem is called serotonin syndrome.
Signs to watch for include agitation, a fast heartbeat, sweating, shivering, tremor, muscle twitching, or confusion. This warning is mostly theoretical, so please don't panic. Keep taking both as prescribed, and let your pharmacist or doctor know you're on both so they can keep an eye on you.
Interaction: Additive serotonergic effects of sertraline (SSRI) and paregoric (camphorated opium tincture; morphine is weakly serotonergic) may increase the theoretical risk of serotonin syndrome.
- Direction: Additive pharmacodynamic effect, not a metabolic (PK) interaction. Neither is a prodrug relevant here.
- Evidence: Theoretical; severity rated major.
- Onset: Unspecified; highest concern at initiation and dose escalation.
- Management: Monitor for autonomic instability, neuromuscular hyperactivity (clonus, tremor, hyperreflexia), and altered mental status. If serotonin syndrome is suspected, discontinue serotonergic agents and give supportive care.
What happens
An increased risk of serotonin syndrome
Interaction Deep Dive
Taking sertraline together with this drug can heighten the likelihood of serotonin syndrome. Patients should be watched carefully for signs of serotonin syndrome, particularly when therapy is begun and when doses are raised. If serotonin syndrome is suspected, stop sertraline along with any other serotonergic agents being used right away and begin supportive care1.
Why it happens (mechanism)
Additive serotonergic effects
How to manage this interaction
The good news is your care team can manage this by keeping a closer eye on you, especially when either medicine is started or a dose is increased.
- Keep taking both exactly as prescribed unless your prescriber tells you otherwise.
- Know the warning signs: agitation, confusion, fast heart rate, sweating, shivering, tremor, muscle twitching, or diarrhea.
- Act promptly: if several of these appear together, contact your doctor or seek urgent care right away.
- Speak up: tell your pharmacist about every serotonergic medicine, supplement, or over-the-counter product you take.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Sertraline and Paregoric together?
Taking paregoric with sertraline may slightly raise the theoretical risk of serotonin syndrome, so keep both as prescribed but watch for symptoms like agitation, sweating, tremor, or a racing heart and report them promptly. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sertraline and Paregoric 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 Paregoric interaction managed?
The good news is your care team can manage this by keeping a closer eye on you, especially when either medicine is started or a dose is increased. Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Know the warning signs: agitation, confusion, fast heart rate, sweating, shivering, tremor, muscle twitching, or diarrhea. Act promptly: if several of these appear togeth… 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 Paregoric 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 (1)
- Product Information: ZOLOFT oral tablets, oral solution, sertraline hydrochloride oral tablets, oral solution. Viatris Specialty LLC (per FDA), Morgantown, WV, 2023. DailyMed
Keep reading about Paregoric
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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