Which ion channel does carbamazepine primarily affect?

Carbamazepine is an anticonvulsant that works by blocking voltage-gated sodium channels, stabilizing neuronal membranes and reducing repetitive firing. It's used for trigeminal neuralgia and seizures. It does NOT primarily affect calcium channels (gabapentin/pregabalin), potassium channels, or chloride channels (benzodiazepines → GABA-Cl).