in a cross-sectional study blood was obtained , 2 h after dosing , from 104 patients with idiopathic parkinsonism , divided into four groups : no l-dopa treatment ( group 1 ) , l-dopa alone ( group 2 ) , l-dopa + benserazide ( madopar ) ( group 3 ) and l-dopa + carbidopa ( sinemet ) ( group 4 ) .
C0023570
l-dopa
C0353697
l-dopa