we administered primidone , 25 mg/kg/day in 3 divided doses , to 10 patients and obtained serum levels of primidone , phenobarbital , and phenylethylmalonic acid at 1 , 2 , 4 , 6 , and 8 hours on day 1 , alternate days until discharge , and after 6 weeks .
C0033148
primidone
C0031412
phenobarbital