Neurology Exam Prep Podcast Episode 16 - An Overview of Antiseizure Drugs
Jul 23, 2020
Explore the intriguing world of antiseizure medications, starting with a case-based approach that highlights the complexities of treating epilepsy. Discover how patient history and drug interactions shape medication choices, especially during pregnancy. Learn about ethosuximide as the go-to for absence epilepsy, and delve into Dravet syndrome’s unique challenges. Get insights on the rapid efficacy of intranasal midazolam for seizure clusters, and understand the risks of skin rashes in elderly patients. Finally, examine effective administration strategies for urgent seizure management.
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Valproic Acid Increases Lamotrigine Levels
- Valproic acid doubles lamotrigine levels by inhibiting its glucuronidation.
- This interaction requires immediate lamotrigine dose reduction when valproic acid starts.
Ethosuximide Mechanism and Use
- Ethosuximide specifically inhibits T-type calcium channels in thalamic reticular neurons, preventing absence seizures.
- This mechanism explains its selectivity and clinical efficacy in childhood absence epilepsy.
Avoid Sodium Blockers in Dravet Syndrome
- Avoid sodium channel blockers like oxcarbazepine in Dravet syndrome as they worsen seizures.
- Choose anti-seizure drugs based on mechanism to prevent exacerbation of genetic epilepsies.