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Coma probably induced by lorazepam-valproate interaction.

Sang-Ahm Lee¹, Jung Kyo Lee, Kyoung Heo

¹Department of Neurology and Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. salee@www.amc.seoul.kr

|April 12, 2002

Summary

Valproate (VPA) can reduce the elimination of lorazepam (LZP), potentially causing severe encephalopathy. This drug interaction highlights the need for careful monitoring in patients receiving both medications.

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Area of Science:

Pharmacology
Clinical Toxicology
Neuroscience

Background:

Valproate (VPA) and lorazepam (LZP) are commonly prescribed medications.
Both drugs are primarily eliminated via glucuronidation, suggesting potential for drug interactions.
Previous reports indicate VPA may reduce LZP elimination, but clinical significance remains unclear.

Observation:

A patient with epilepsy experienced severe encephalopathy, including coma.
This adverse event occurred during concomitant administration of VPA and LZP.
The patient's condition suggests a significant VPA-LZP drug interaction.

Findings:

Concomitant VPA administration significantly impaired LZP clearance in a patient with epilepsy.
The drug interaction led to severe central nervous system depression, manifesting as coma.

Related Experiment Videos

This case demonstrates the clinical significance of the VPA-LZP interaction.

Implications:

Clinicians should exercise caution when prescribing VPA and LZP together.
Close monitoring for signs of encephalopathy is crucial in patients on combined VPA and LZP therapy.
This interaction may necessitate dose adjustments or alternative medication choices to ensure patient safety.