Phenytoin is used to treat many conditions related to the nervous system, especially in controlling epileptic seizures. This drug works to reduce abnormal electrical activity in the brain, which helps prevent seizures.
Phenytoin is also used in some cases to prevent seizures resulting from head injuries or brain surgeries. In addition, phenytoin may sometimes be prescribed for other medical purposes under the supervision of a doctor, but it is usually the treatment option for people who suffer from partial epilepsy or generalized seizures.