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Dilantin (dī´lăntĬn), 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.