Perampanel May Help Some Children With Autoimmune Seizures

What was studied

This study looked at perampanel, a seizure medicine, in 14 children with autoimmune encephalitis (AE) who had AE-related seizures or epilepsy. It was a retrospective single-center case series, meaning the researchers reviewed past medical records from 2020 to 2025. The children had a median age of 8.5 years, and 9 were boys and 5 were girls.

The children were split into two groups of 7 each. One group had acute symptomatic seizures secondary to AE. The other group had autoimmune-associated epilepsy. The median maintenance dose of perampanel ranged from 2 to 4 mg per day. The researchers retrospectively collected clinical data, seizure outcomes, concomitant treatments, and adverse events.

What they found

Seizure improvement was observed in some children after perampanel administration. In the acute seizure group, 3 of 7 children had seizure resolution during the acute phase. In the autoimmune-associated epilepsy group, by 3 months, 4 of 7 had at least a 50% reduction in seizure frequency compared with baseline, and 3 of 7 were seizure-free. No serious adverse events were reported in either group.

Limits of the evidence

This was a very small study with only 14 children, and it was done at a single center. It was retrospective, so it can describe outcomes after perampanel administration but cannot show that perampanel caused the improvement. Most children also received other antiseizure medicines and immunotherapy, so it is hard to separate the possible role of perampanel from those other treatments. The findings were described by the authors as preliminary and hypothesis-generating.

For families and caregivers

For families, this study suggests that some children with AE-related seizures or epilepsy had improved seizure outcomes after perampanel was added, and no serious adverse events were reported in this small group. But the evidence is still early and preliminary. It does not show that perampanel was responsible for the improvements, and treatment decisions still depend on the child’s situation and other treatments being used.

What to watch next

Larger studies with longer follow-up could help clarify seizure outcomes and tolerability of perampanel in children with AE-related seizures or epilepsy.

Terms in this summary

autoimmune encephalitis

A brain inflammation caused by the body’s immune system attacking the brain.

antiseizure medication

A medicine used to prevent or reduce seizures.

perampanel

An antiseizure medicine studied here in children with AE-related seizures.

retrospective study

A study that looks back at existing medical records instead of planning treatment ahead of time.

acute symptomatic seizures

Seizures that happen during an active illness or brain problem, such as the acute phase of AE.

autoimmune-associated epilepsy

Epilepsy associated with autoimmune encephalitis.

immunotherapy

Treatment that changes or calms the immune system.

seizure freedom

Having no seizures during the time period being measured.