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Fosphenytoin is an anticonvulsant that works by slowing down impulses in the brain that cause seizures. Fosphenytoin is used to prevent or control seizures. Fosphenytoin is used only for a short time when other forms of phenytoin cannot be given. Fosphenytoin may also be used for purposes not listed in this medication guide.Cerebyx is a brand whose generic drug is Fosphenytoin sodium injection. This water soluble drug is administered intravenously and is safer than other previous versions of the medicine. Cerebyx is an anticonvulsant drug and works in the brain and CNS or central nervous system of the body where it is effective.