Antiepileptic Overdose

Area of Science:

• Toxicology
• Pharmacology
• Emergency Medicine

Background:

• Antiepileptic drugs (AEDs) are widely used for epilepsy and other conditions like chronic pain and psychosis.
• Overdoses of common AEDs such as phenytoin, sodium valproate, carbamazepine, and phenobarbital pose significant clinical challenges.
• AED toxicity can manifest with diverse symptoms, including central nervous system (CNS) effects and paradoxical seizures.

Purpose of the Study:

• To review the common antiepileptic drugs implicated in overdose.
• To describe the clinical manifestations and diagnostic approaches for AED toxicity.
• To outline the current management strategies for antiepileptic drug overdoses.

Main Methods:

• Review of literature on antiepileptic drug overdoses.
• Summary of clinical presentations associated with specific AED toxicities.
• Discussion of treatment modalities including decontamination, antidotes, and extracorporeal removal.

Main Results:

• Common AEDs like phenytoin, valproate, carbamazepine, and phenobarbital cause CNS toxicity, seizures, and specific organ damage (e.g., hyperammonemic encephalopathy with valproate, cardiac issues with carbamazepine).
• Diagnosis relies on clinical presentation and serum drug levels, with serial monitoring crucial due to prolonged toxicity.
• Management includes airway, breathing, and circulation (ABC) stabilization, activated charcoal, and specific interventions like sodium bicarbonate for carbamazepine or naloxone/carnitine for valproate.

Conclusions:

• Prompt recognition and management of antiepileptic drug overdoses are critical for patient outcomes.
• Treatment strategies are tailored to the specific drug involved, ranging from supportive care to advanced interventions.
• Extracorporeal removal methods, particularly hemodialysis, are valuable in severe or prolonged cases of AED toxicity.