samples of the blood concentrations were taken from 1,922 patients ranging in age from one to 40 : 1,567 measured values were obtained under medication with phenobarbital ( pb ) , phenytoin ( pht ) , carbamazepine ( cbz ) or valproate ( vpa ) alone , and 2,201 under medication with any two of the above-mentioned antiepileptic drugs .
C0031507
phenytoin
C0003299
antiepileptic drugs