1) Anticonvulsant 2) Anticonvulsant drug 3) Antiepileptic 4) Antiepileptic drug 5) Mesantoin 1) Mesantoin 
Mephenytoin (marketed as Mesantoin by Novartis) is a hydantoin, used as an anticonvulsant. It was introduced approximately 10 years after phenytoin, in the late 1940s. The significant metabolite of mephenytoin is nirvanol (5-ethyl-5-phenylhydantoin), which was the first hydantoin (briefly used as a hypnotic). However, nirvanol is quite toxic and m...
<chemical> An anticonvulsant effective in grand mal epilepsy. It may cause blood dyscrasias. ... Pharmacological action: anticonvulsants. ... Chemical name: 2,4-Imidazolidinedione, 5-ethyl-3-methyl-5-phenyl- ... (12 Dec 1998) ... 
(mә-fen´ә-to-in) an anticonvulsant administered orally in treatment of several types of epilepsy when the seizures are refractory to other drugs.
[n] - a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective
Mesantoin noun a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective