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Time courses for serum concentration of valproic acid (VPA), red blood cells (RBC) and episodes of epileptic seizures (A), serum concentration of phenytoin (PHT) (B), and serum concentration of hCGβ (C) during chemotherapy in an epileptic patient. The daily dose of VPA was 1200 mg and that of PHT was 300 mg. Seizwes (
); chemotherapy (
); serum concn. of VPA before chemotherapy (▪)
