dl-threo-3,4-dihydroxyphenylserine ( dl-threo-dops ) was administered during 10 days to 4 patients with longstanding parkinson 's disease in addition to their treatment with l-3,4-dihydroxyphenyl-l-alanine ( l-dopa ) -carbidopa ( sinemet ) .
C0030567
parkinson 's disease
C0006982
carbidopa