Definition of phenytoin in English:



mass nounMedicine
  • A synthetic compound related to hydantoin, used as an anticonvulsant in the treatment of epilepsy.

    • ‘Magnesium sulfate has been shown to be superior to phenytoin and diazepam for the treatment of eclamptic seizures.’
    • ‘The anticonvulsant drugs phenytoin and valproic acid appear to interfere with folate absorption.’
    • ‘Drugs called anti-convulsants, such as phenytoin and valproic acid, are used to stop the involuntary action of the diaphragm.’
    • ‘Anticonvulsant medications, including phenobarbital, valproic acid, phenytoin, and carbamazepine, have a significant lowering effect on carnitine levels.’
    • ‘Anticonvulsants, such as phenytoin and carbamazepine, may be given to control epileptic fits.’


1940s: blend of phenyl and hydantoin.