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NEUROLOGY 1976;26:715
© 1976 American Academy of Neurology

Phenytoin kinetics in children

RICHARD G. CURLESS, M.D., PHILIP D. WALSON, M.D. and DEAN E. CARTER, Ph.D.

From the Departments of Pediatrics, Neurology, and Pharmacology, University of Arizona College of Medicine, Tucson, Arizona.

Previous studies have shown the importance of phenytoin kinetics in the management of adult patients with seizure disorders. The long half-life in adults makes single daily dosing realistic in terms of blood levels and anticonvulsant effectiveness. This report shows a wide range in both half-lives and volumes of distribution of phenytoin in 11 children (ages 6 months to 6 years) with seizure disorders. Ten of these patients have very short phenytoin half-lives (1.2 to 6.7 hours). The data strongly suggest that current recommendations for phenytoin dosage regimens in adults cannot necessarily be used in children. Blood levels must be followed closely in this age group to determine the required dosage and dose interval.

Dr. Curless' address is Department of Pediatrics, Arizona Medical Center, Tucson, AZ 85724.

This study was supported in part by Clinical Research grant No. 1 M01 RR00714 and NIH grant No. 5 T22 GM00071.

Received for publication November 13, 1975.




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