Phenytoin capsules are mainly used in the treatment of epilepsy disorders to control epileptic seizures by regulating abnormal electrical activity in the brain. It is effective in treating tonic-clonic seizures, which are called grand mal seizures and partial seizures. Phenytoin can also sometimes be used to prevent seizures that may occur as a result of head injuries or after neurosurgical operations. In addition,
phenytoin may be prescribed in specific cases based on the doctor's instructions to treat problems related to electrical activity in the nerves.