A 12 year old boy is admitted to the paediatric intensive care unit after a motor vehicle collision, where he sustained a severe closed head injury. He lost consciousness at the scene and was intubated in the emergency department for a Glasgow Coma Score of 8 and no gag reflex. The boy has no history of seizure activity in the past or at the scene. Your local “Traumatic Brain Injury Protocol” recommends that he receive phenytoin for seizure prophylaxis. You have recently cared for a child who nearly died from phenytoin hypersensitivity syndrome and would like to know if there is a good indication for the drug.