Phenytoin DESCRIPTION NewsLinks Phenytoin sodium is an antiepileptic drug. Phenytoin sodium is related to the barbiturates in chemical structure, but has a five-membered ring. The chemical name is 5, 5-diphenyl-2, 4-imidazolidinedione. Each Dilantin (extended phenytoin sodium) capsule contains 30 mg or 100 mg phenytoin sodium. Also contains lactose, confectioner's sugar, talc, and magnesium ...

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