How do stiripentol's gabaergic effects differ from fenfluramine?

How do stiripentol’s GABAergic effects differ from fenfluramine?

Stiripentol increases GABA levels by inhibiting its reuptake and metabolism, while fenfluramine releases serotonin and indirectly modulates GABA activity through serotonin receptors.

What exactly happens at the synapse when these drugs interact with GABA?
Stiripentol blocks GABA transaminase and the GABA transporter, raising extracellular GABA concentrations and prolonging its inhibitory signal. Fenfluramine does not directly touch the GABA system; it triggers serotonin release, which activates 5-HT2C receptors that ultimately reduce excitatory input onto GABAergic interneurons.

Why does this matter for seizure control in Dravet syndrome?
Stiripentol’s direct GABA boost complements sodium-channel blockers such as valproate and clobazam, forming the triple therapy often used in Dravet. Fenfluramine’s serotonin-driven approach reduces hyperexcitability through network-level modulation rather than raising GABA itself, so it can be added to the gleichen triple therapy without overlapping mechanisms.

How long does each effect last and who makes these drugs?
Stiripentol’s action persists during continuous administration, but the drug itself has limited duration in the body; it is marketed by Biocodex. Fenfluramine’s serotonin release continues throughout its daily dosing schedule, and it is produced by Zogenix/UCB.

What side effects are patients most concerned about?
Both drugs open up conversation about appetite loss and drowsiness. Stiripentol mainly causes somnolence and ataxia; fenfluramine concerns center on heart-valve monitoring and weight loss.