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Emergency Management of Serotonin Syndrome

Hunter criteria-based recognition and treatment algorithm of life-threatening hyperserotonergic state.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Acil Servis department. Book Appointment →

What is Emergency Management of Serotonin Syndrome?

Serotonin syndrome is a life-threatening condition that develops with serotonergic drug overdose, drug interaction or therapeutic dose. SSRIs, SNRIs, MAOIs, tramadol, ondansetron, linezolid and recreational drug (MDMA) use are the most common triggers.

Diagnosis is made with the Hunter criteria: spontaneous clonus, induced clonus + agitation/hyperthermia, ocular clonus + agitation/hyperthermia, tremor + hyperreflexia. The classical clinical triad consists of mental status changes, autonomic instability and neuromuscular hyperactivity.

Treatment includes withdrawal of the offending drug, supportive care, benzodiazepines (lorazepam) and cyproheptadine (5-HT2A antagonist) in moderate-severe cases. Aggressive cooling, paralysis (rocuronium) and intubation are needed in severe hyperthermia.

Symptoms

Hyperthermia (>38°C, can be >40°C)
Tremor and hyperreflexia
Clonus (spontaneous or induced)
Agitation and confusion
Tachycardia and hypertension
Diaphoresis and mydriasis

Risk Factors

SSRI + MAOI combination
Tramadol and SSRI use
Linezolid and serotonergic drug
MDMA, cocaine use
Ondansetron and SSRI
Drug overdose (intentional)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Confusion and tremor while on serotonergic drug
  • Severe hyperthermia
  • Agitation and clonus
  • Tachycardia and hypertension
  • Persistent muscle tightness
  • Loss of consciousness

Treatment Methods

01
Immediate discontinuation of offending drug
02
Aggressive cooling and IV fluid
03
Benzodiazepines (lorazepam)
04
Cyproheptadine (12 mg PO + 2 mg q2h)
05
Severe cases: rocuronium + intubation
06
ICU and continuous monitoring

Which Department to Visit?

You can visit our Acil Servis department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Acil Servis Department

Let us help you

You can make an appointment with our specialists or contact us for your concerns.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.