Question: is fosphenytoin the same as dilantin?
Answer: Are Cerebyx and Dilantin the Same Thing? Dilantin (phenytoin) and Cerebyx (fosphenytoin sodium) are anti-epileptic drugs (anticonvulsants) used to control seizures. Cerebyx is used only for a short time, such as 5 days, when other forms of phenytoin cannot be given.