Potassium channel agonists emerging as treatment options for focal epilepsy: are we breaking new ground?

Focal epilepsy is a leading cause of neurological disability, with about one-third of patients failing to achieve seizure freedom despite numerous antiseizure medications (ASMs) are available. Most current therapies broadly modulate synaptic transmission, leading to dose-limiting cognitive, psychiatric, and systemic adverse effects. Kv7 (KCNQ) potassium channels, responsible for the neuronal M-current, represent a high-precision therapeutic target that regulates intrinsic excitability and provides a fundamental 'molecular brake' against pathological firing.

This mini-review summarizes the clinical evolution of Kv7 modulation, from the first-generation prototype ezogabine to more selective second-generation candidates. We outline the scientific rationale for targeting the M-current, review emerging clinical data for agents such as azetukalner (XEN1101) and opakalim (BHV-7000), and highlight preclinical strategies including dual-mechanism modulators and drug repurposing.

Kv7 agonists offer a mechanistically elegant approach to restoring seizure resistance. Second-generation agents provide encouraging mechanistic and clinical proof-of-concept, but long-term success will depend on clear advantages in patient-centered outcomes over established ASMs. Future value is likely to lie in precision-medicine strategies for KCNQ2/3-related encephalopathies and a carefully defined role in managing neuropsychiatric comorbidities.