Abstract:
:We investigated levodopa intravenous infusion rates, plasma concentrations, and clinical responses in 23 parkinsonian patients with a fluctuating response to the drug. There was a linear relationship between rate of levodopa infusion and plasma concentration when carbidopa was coadministered. Minimum-therapeutically effective plasma concentrations of levodopa ranged from 3 to 12 nmol/ml. The duration, but not the magnitude, of clinical response was linearly related to plasma concentrations. The clinical response lagged behind the rise and fall of plasma levodopa. There was no evidence of idiosyncratic pharmacokinetic or pharmacodynamic responses to levodopa to explain the fluctuating response.
journal_name
Neurologyjournal_title
Neurologyauthors
Nutt JG,Woodward WRdoi
10.1212/wnl.36.6.739subject
Has Abstractpub_date
1986-06-01 00:00:00pages
739-44issue
6eissn
0028-3878issn
1526-632Xjournal_volume
36pub_type
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