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Carbamazepine overdose. Features of 33 cases
1Intensive Care Unit, Royal Melbourne Hospital, Parkville, Victoria, Australia.
Drug Safety
|January 1, 1993
Summary
Carbamazepine overdose in adults often involves multiple substances and presents with neurological symptoms like altered consciousness and ataxia. Management focuses on supportive care, activated charcoal, and airway support.
Area of Science:
- Clinical Toxicology
- Pharmacology
Background:
- Carbamazepine is a widely prescribed anticonvulsant.
- Overdose can lead to significant toxicity.
- Understanding overdose patterns is crucial for patient management.
Purpose of the Study:
- To review cases of carbamazepine overdose.
- To identify clinical manifestations and complications.
- To inform management strategies for carbamazepine toxicity.
Main Methods:
- Retrospective review of medical records from two adult teaching hospitals.
- Analysis of 33 carbamazepine overdose cases over a four-year period.
- Data collection on patient demographics, ingested substances, clinical signs, and laboratory findings.
Main Results:
- Mean age of patients was 30 years; 58% had epilepsy.
- Mean ingested dose was 12g, with 51% involving co-ingestants like alcohol.
- Common symptoms included altered consciousness (100%), mydriasis (42%), abnormal reflexes (55%), and ataxia/nystagmus (48%).
- Complications included seizures (24%), hyperglycemia, hypokalemia, hyponatremia, and transient hepatic dysfunction.
- Higher drug concentrations correlated with hyperglycemia and hypokalemia.
Conclusions:
- Carbamazepine overdose presents with a distinct clinical picture, primarily neurological.
- Co-ingestion with other substances is common and influences toxicity.
- Supportive management, including activated charcoal and airway management, is key.
- Pharmacokinetic properties guide treatment decisions.