LabCorp Test

Phenytoin (Dilantin) Serum Test

Quick Overview

Test for phenytoin, which is useful in generalized tonic-clonic, complex partial, and simple partial seizures and frequently is chosen for initial therapy, particularly in adults.

Test #007401


Availability: In stock

Also Known As Dilantin, Diphenylhydantoin, Phenytek
Preparation No special preparation required.
Test Results 1-2 days. May take longer based on weather, holiday or lab delays.


Because of phenytoin's potential adverse reactions (gingival hyperplasia, hirsutism, coarsening of facial features), other antiepileptic drugs are often prescribed for infants and young children. Phenytoin is commonly given with primidone, carbamazepine, phenobarbital, or valproate when monotherapy fails. It is ineffective in myoclonic, absence, and atonic seizures and is not recommended for the treatment of infantile spasms, Lennox-Gastaut syndrome, and epileptic syndromes in older children and adolescents when absence seizures or myoclonus is present. Intravenous phenytoin sodium is effective for status epilepticus and can be used as the initial drug to manage recurrent widely spaced seizures. This drug may also initially prevent seizures in high-risk patients with head trauma. Phenytoin has been advocated for many other disorders, however conclusive evidence of effectiveness is inadequate for most proposed indications.

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