/ Thesaurus / M Synonyms of mephenytoin Find synonyms for: Noun1. mephenytoin, Mesantoin, anticonvulsant, anticonvulsant drug, antiepileptic, antiepileptic drugusage: a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffectiveWordNet 3.0 Copyright 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: maritime Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language