the final method , in which the three extraction methods were interfaced , permitted routine monitoring in a single 1 ml volume of human plasma of any one or combination of the following drugs : phenytoin ( pht ) , phenobarbital ( pb ) , primidone ( pd ) , 5-ethyl-5-phenylhydantoin ( eph ) , ethosuximide ( es ) , carbamazepine ( cbz ) , and valproic acid ( vpa ) .
C0031412
phenobarbital
C0033148
primidone