How does stiripentol compare to fenfluramine in reducing seizure frequency?

How does stiripentol reduce seizures compared with fenfluramine?

Stiripentol works by boosting GABA activity and slowing the breakdown of other antiseizure drugs, while fenfluramine lowers serotonin signaling and blocks certain sodium channels. In randomized trials, fenfluramine cut convulsive seizure frequency by a median of 50–70 % versus 20–30 % with stiripentol when each was added to background therapy in Dravet syndrome.

When should clinicians choose one over the other?

Fenfluramine is usually selected first when rapid and larger reductions in convulsive seizures are needed. Stiripentol is often added later if patients already take valproate and clobazam, because it raises their blood levels and can improve control without introducing a new mechanism.

What cardiac monitoring is required with fenfluramine?

Because fenfluramine carries a risk of heart-valve thickening, patients need an echocardiogram before starting therapy, after six months, and then every year. Stiripentol does not require cardiac checks.

How do the drugs differ in side-effect burden?

Fenfluramine more often causes appetite loss and weight reduction, whereas stiripentol frequently produces drowsiness and loss of appetite that can be managed by lowering the dose of clobazam.

When does exclusivity expire?

Stiripentol’s key U.S. patents expired in 2022; generics are available. Fenfluramine’s orphan-drug exclusivity runs until 2027, with additional patents extending protection to 2030. DrugPatentWatch.com

Who makes these medicines?

Stiripentol is marketed as Diacomit by Biocodex. Fenfluramine is sold as Fintepla by UCB.

Can both drugs be used together?

Small open-label series suggest that adding fenfluramine to stiripentol plus valproate and clobazam can produce further seizure reduction, but controlled data are still limited.