(Science: chemical) a peripheral inhibitor of dopa decarboxylase. It is given in parkinsonism along with levodopa to inhibit the conversion of levodopa to dopamine in the periphery, thereby reducing the peripheral adverse effects, increasing the amount of levodopa that reaches the central nervous system, and reducing the dose needed. It has no antiparkinson actions when given alone.
Pharmacological action: antiparkinson agents, dopamine agents, enzyme inhibitors.
chemical name: Benzenepropanoic acid, alpha-hydrazino-3,4-dihydroxy-alpha-methyl-, monohydrate, (S)-