Stiripentol's Approved Seizure Types
Stiripentol is FDA-approved for Dravet syndrome in patients aged 2 years and older taking clobazam. It reduces overall seizure frequency, with particular efficacy against multiple generalized seizure types in Dravet, including tonic-clonic, myoclonic, atypical absence, and focal seizures.[1][2]
Fenfluramine's Approved Seizure Types
Fenfluramine is FDA-approved for seizures associated with Dravet syndrome (ages 2 years and older) and Lennox-Gastaut syndrome (LGS; ages 2 years and older). It targets drop seizures (tonic or atonic) and other seizures in these conditions.[1][3]
Key Differences in Treated Seizures
Stiripentol treats tonic-clonic, myoclonic, and atypical absence seizures specifically in Dravet syndrome, alongside focal seizures—types not explicitly highlighted in fenfluramine's core approvals. Fenfluramine emphasizes drop seizures in both Dravet and LGS, extending coverage to LGS (which stiripentol does not treat).[2][3]
| Seizure Type | Stiripentol (Dravet only) | Fenfluramine (Dravet + LGS) |
|-----------------------|---------------------------|-----------------------------|
| Tonic-clonic | Yes | Yes (Dravet) |
| Myoclonic | Yes | Limited data |
| Atypical absence | Yes | Yes (Dravet/LGS) |
| Focal | Yes | Yes (Dravet) |
| Drop (tonic/atonic) | Limited | Yes (primary in LGS) |
| LGS seizures | No | Yes |
Why These Differences Matter for Dravet Patients
In Dravet syndrome, stiripentol shows stronger evidence for myoclonic and tonic-clonic seizures per clinical trials, often used with valproate and clobazam. Fenfluramine reduces convulsive seizures broadly but excels in atonic drops common in LGS. No head-to-head trials exist; choice depends on dominant seizure types.[2][4]
How Do They Work Differently on Seizures?
Stiripentol enhances GABAergic inhibition and reduces glutamate excitotoxicity, aiding multiple Dravet seizure types. Fenfluramine boosts serotonin and sigma-1 receptor activity, broadly suppressing seizures but with cardiovascular monitoring needs.[1][5]
Sources
[1]: FDA Label - Stiripentol (Diacomit)
[2]: FDA Label - Fenfluramine (Fintepla)
[3]: Epilepsy.com - Dravet Treatments
[4]: NEJM - Stiripentol in Dravet (2007)
[5]: PubMed - Mechanisms Review (2021)