, trade name for diphenylhydantoin, an anticonvulsant drug. The first nonsedative antiepileptic agent, it is still widely used to control the grand mal type of epilepsy
. It is also useful against types of psychomotor epilepsy, i.e., epilepsy involving bizarre patterns of movement. In some cases Dilantin, in combination with phenobarbital, a barbiturate
, is more effective than either drug used alone.
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