Mouse anti-Phenytoin monoclonal antibody for IA. Phenytoin is ananticonvulsant drug which can be useful in the treatment of epilepsy.Phenytoin blocks voltage-sensitive sodium channels in neurons. This actionleads to a delay in neuronal electrical recovery. Phenytoin"s inhibitoryeffect is dependent on the voltage and frequency of neural cell firing byselectively blocking the neurons that are firing at high frequency. Phenytoinprevents the electrical spread of a focus of irritable tissue from enteringnormal tissue. Phenytoin reduces the maximal activity of brain stem centersresponsible for the tonic phase of tonic clonic (grand mal) seizures.