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Systematic ReviewResearchMedication Safety

Most prescription-related serotonin syndrome cases involved multiple drugs, often including non-antidepressants

European journal of clinical pharmacology (PubMed)Jul 17, 2026

AI-summarized from the linked source. Educational brief, not medical advice.

Brief summary

A patient-level systematic review of 764 published serotonin syndrome cases found that 92.9% of 645 regular-prescription cases involved at least two drugs and 90.7% included a non-antidepressant; trazodone, fentanyl, and tramadol were prominent nodes in the drug co-occurrence network.

What NurseJet pulled from the source

This systematic review analyzed 764 adult serotonin syndrome cases reported through June 2024. Of 645 cases linked to regular prescriptions, 92.9% involved at least two agents and 90.7% included a non-antidepressant. Trazodone was the most connected antidepressant in the co-occurrence network, while fentanyl and tramadol were the most connected non-antidepressants. Cases following suicide attempts had higher ICU admission and mortality than regular-prescription cases. Diagnostic certainty varied: 85.6% met Sternbach criteria and 65.0% met Hunter criteria. Because the evidence comes from published cases, co-occurrence identifies medication-review signals rather than incidence or proof that a particular combination caused toxicity.

Why this matters for nurses

Nurses reconcile medications across prescribers and care settings, administer serotonergic and interacting agents, and often first recognize a concerning change after medication initiation, dose change, or overdose. The review broadens attention beyond antidepressant-only combinations.

Bedside takeaway

Most prescription-related case reports involved multiple drugs, so medication review should include opioids and other non-antidepressants.

How This Applies in Practice

Use this when: Reconciling medications or escalating suspected serotonin toxicity after a medication start, change, interaction, or overdose.

On your shift

  • Build a complete timeline of prescribed, as-needed, over-the-counter, recently started, dose-changed, and recently stopped agents.
  • Communicate the full medication list and timing promptly through the facility's toxicity or emergency escalation pathway.
Keep in mind: Case-report co-occurrence does not prove that a specific drug combination caused toxicity. Follow the emergency protocol, facility policy, and patient-specific provider orders.

Explain this for my unit

Key takeaways

  • The patient-level review included 764 published adult serotonin syndrome cases.
  • Among 645 regular-prescription cases, 92.9% involved at least two drugs and 90.7% included a non-antidepressant.
  • Trazodone, fentanyl, and tramadol were highly connected in the medication co-occurrence network.
  • Only 65.0% of cases met Hunter criteria, and case-report evidence cannot estimate incidence or establish causality.

Practice implications

  • During medication reconciliation and handoff, review prescribed, as-needed, over-the-counter, and recently stopped agents together rather than screening antidepressants alone. If serotonin toxicity is suspected, hold no ordered medicine independently unless the emergency protocol directs it; escalate promptly with the full medication timeline.

Limitations & cautions

  • The evidence consists of published case reports and series, which are vulnerable to reporting, selection, and documentation bias. Diagnostic criteria were inconsistently met, medication co-occurrence does not prove causality, and the dataset cannot estimate population incidence or comparative risk for specific combinations.
  • AI-summarized from the linked source. Review the original article before applying to practice.

Citations

Exact source links

Public citations are filtered to exact credible source pages. Homepage-only or invalid links stay in admin review and are not shown here.

European journal of clinical pharmacology (PubMed)

European journal of clinical pharmacology (PubMed). Precipitants and clinical features of serotonin syndrome: a systematic review with patient-level analysis of published case reports and series.

Open original source

https://pubmed.ncbi.nlm.nih.gov/42463509/

Professional education only

This summary does not replace clinical judgment, facility policy, provider orders, or official guidelines. Verify practice changes against the original source and local protocol.

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