[Determination of phenobarbital, mephenytoin and diphenylhydantoin in the surveillance of anticonvulsant treatment].

The authors describe a method of simultaneous estimation of phenobarbitone, mephenytoin and diphenylhydantoin in the blood. After extraction with ether, the methylation of these substances by trimethylanilinium hydroxide permits their rapid separation by gas chromatography. Heptabarbitone is used as internal standard and the chromatograph used is supplied with a thermoionic detector. The technique used is simple and rapid. Its reproducibility and sensitivity are satisfactory, permitting daily application to the supervision of anticonvulsant treatment, especially in Pediatrics.