Serotonin syndrome in dextromethorphan ingestion responsive to propofol therapy.

An 18-year-old male developed a severe serotonin syndrome after recreational ingestion of Coricidin HBP (chlorpheniramine 4 mg and dextromethorphan hydrobromide 30 mg). Propofol infusion rapidly normalized his agitation, neuromuscular hyperactivity, and autonomic instability. Confirmatory analysis demonstrated a dextromethorphan serum concentration of 930 ng/mL. Dextromethorphan can produce serotonin syndrome in the absence of another serotonergic drug.