[fen-i-toh-in, fuh-nit-oh-] /ˌfɛn ɪˈtoʊ ɪn, fəˈnɪt oʊ-/

noun, Pharmacology.
a barbiturate-related substance, C 1 5 H 1 2 N 2 O 2 , used as an anticonvulsant in the treatment of grand mal epilepsy and in focal seizures.
an anticonvulsant drug used in the management of epilepsy and in the treatment of abnormal heart rhythms. Formula: C15H11N2O2Na Also called diphenylhydantoin sodium

phenytoin phen·y·to·in (fěn’ĭ-tō’ĭn, fə-nĭt’ō-)
An anticonvulsant drug chemically related to the barbiturates and used most commonly in the treatment of epilepsy.


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