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Carisoprodol-induced myoclonic encephalopathy
1California Poison Control System-San Francisco Division, San Francisco General Hospital 94110, USA.
Journal of Toxicology. Clinical Toxicology
|October 20, 1998
Summary
Severe carisoprodol overdose can cause agitation and myoclonic encephalopathy, not just CNS depression. This highlights the need to recognize movement disorders in carisoprodol toxicity.
Area of Science:
- Clinical Toxicology
- Pharmacology
- Neurology
Background:
- Carisoprodol is a muscle relaxant metabolized to meprobamate.
- Overdose is typically associated with central nervous system (CNS) depression.
- Literature review suggests limited data on severe overdose presentations.
Observation:
- A 39-year-old male ingested 35g of carisoprodol.
- Clinical presentation included agitation, tachycardia, myoclonus, and coma.
- Toxicology confirmed high blood levels of carisoprodol (71 mcg/mL) and meprobamate (26 mcg/mL).
Findings:
- This case presents severe carisoprodol intoxication with symptoms of myoclonic encephalopathy.
- Findings contradict the assumption of simple CNS depression in carisoprodol overdose.
- A review of poison control data indicates agitation and movement disorders are more common than previously reported.
Implications:
- Clinicians should consider myoclonic encephalopathy in severe carisoprodol overdose cases.
- Enhanced recognition of movement disorders associated with carisoprodol toxicity is warranted.
- Further research into carisoprodol pharmacology and toxicity mechanisms is needed.