Fosphenytoin disodium is primarily used in medical settings as an anticonvulsant. It is administered to control and prevent seizures, particularly in emergency situations such as status epilepticus, where rapid intervention is critical. This compound is often preferred over other anticonvulsants due to its water solubility, which allows for faster and safer intravenous or intramuscular administration. It is also used in cases where oral medication is not feasible, such as in unconscious patients or during surgical procedures. Additionally, fosphenytoin disodium is utilized for short-term management of seizures in neurosurgical settings and as a prophylactic measure in patients with a history of seizures. Its rapid conversion to phenytoin in the body ensures effective seizure control with reduced risk of adverse effects associated with direct phenytoin administration.