plasma levels of gamma-glutamyl transpeptidase were measured prospectively in 75 epileptic patients treated with one of the following drugs : phenobarbitone ( n = 20 ) , phenytoin ( n = 23 ) , carbamazepine ( n = 18 ) or sodium valproate ( n = 14 ) .
C0014544
epileptic
C0031507
phenytoin