The response to levodopa in Parkinson's disease: imposing pharmacological law and order.

Abstract:

:The seemingly unpredictable response to levodopa in patients with Parkinson's disease can be understood as an interaction between several distinct pharmacological effects of levodopa. The most important are a short-duration response with a half-life of minutes to hours and a long-duration response with a half-life of days, superimposed on diurnal motor variation. A negative response characterized by brief worsening before and after the short-duration response and dyskinesia accentuate the short-duration response. These various responses are modified by disease progression and long-term levodopa therapy. Pharmacodynamic modeling of the short-duration response indicates that with time, the response becomes less graded and small changes in levodopa concentrations can produce big changes in response. In this setting, unpredictability arises from the variation in absorption and distribution of levodopa.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Nutt JG,Holford NH

doi

10.1002/ana.410390504

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

561-73

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

39

pub_type

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