L-threodops increases extracellular norepinephrine levels in the brain: an in vivo study

Extracellular norepinephrine levels in the striatum of normal rats increased significantly following the administration of L-threodops. When peripheral decarboxylase activity was inhibited with carbidopa, administration of the same dose of L-threodops induced a 2.5-fold greater increase in norepinephrine levels.