/ Thesaurus / M Synonyms of mesantoin 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: inane Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language