[Urinary excretion of 3,4-dihydroxyphenyl-alanine, 3-O-methyldopa, dopamine and homovanillic acid in man. Effects of an inhibitor of decarboxylase of aromatic amino acids (Benserazide) (author's transl)].

After administration of a single and small (125 mg) dose of benserazide, 3,4-dihydroxyphenyl-alanine and 3-O-methyldopa are excreted in urine. Uturbancies last for at least 48 hours.