a 5-ht precursor , 5-hydroxytryptophan ( 5-htp ; 20-80 mg/kg , i.p . ) , suppressed the convulsions in a dose-dependent manner as shown by a decrease in the incidence and a prolongation of the latency , but a da precursor , 3,4-dihydroxyphenylalanine ( l-dopa ; 20-80 mg/kg , i.p . ) , markedly shortened the latency .
C0013023
dihydroxyphenylalanine
C0023570
l-dopa