Management of Tonic-Clonic Seizures

Initial Management

The American College of Emergency Physicians recommends IV benzodiazepines as the first-line treatment for acute management of tonic-clonic seizures, with lorazepam being the preferred option due to its longer duration of action 1, 2
If IV access is not available, rectal diazepam should be administered as an alternative 2

Valproate has demonstrated high efficacy (63-88%) in controlling seizures within 20-60 minutes of administration, with a favorable safety profile and fewer adverse effects compared to phenytoin 1, 3
Levetiracetam shows similar efficacy to valproate (68-73%) in controlling refractory seizures, with minimal drug interactions and no requirement for serum level monitoring 1, 2
The recommended dosing for valproate is 30 mg/kg IV infused at 6 mg/kg/hour, followed by maintenance infusion of 1-2 mg/kg/hour, while levetiracetam is administered at 30 mg/kg IV at 5 mg/kg per minute 4

The National Comprehensive Cancer Network recommends ensuring airway, breathing, and circulation, and administering IV benzodiazepine (lorazepam preferred) as initial assessment and stabilization 1, 2, 5
If seizures continue after benzodiazepine administration, choose between valproate (30 mg/kg IV) or levetiracetam (30 mg/kg IV) based on patient's comorbidities, potential drug interactions, and previous medication response 2, 3, 4

The National Comprehensive Cancer Network recommends avoiding prophylactic anticonvulsants in patients with no history of seizures, as they do not reduce the risk of first seizure 5
Monotherapy is preferred over polytherapy to minimize adverse effects and drug interactions 2

Consider transitioning to oral formulations of the same medication that controlled the acute seizure for patients requiring ongoing treatment 2
Consider discontinuation of antiepileptic drugs after 2 seizure-free years, taking into account clinical factors 2