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Changes in psychomotor effects of L-dopa and methylphenidate after sustained dopaminergic therapy in Parkinson's disease

Evans, A. H., Lawrence, Andrew David and Lees, A. J. 2009. Changes in psychomotor effects of L-dopa and methylphenidate after sustained dopaminergic therapy in Parkinson's disease. Journal of Neurology, Neurosurgery & Psychiatry 80 (3) , pp. 267-272. 10.1136/jnnp.2006.108993

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Abstract

Background: Sustained drug therapy in Parkinson’s disease may alter the psychomotor responses to acute challenges with dopaminergic drugs, L-dopa and methylphenidate, and cause cross sensitisation. Methods: The mood, psychomotor and reward potentiating effects of an acute challenge with L-dopa and methylphenidate on separate occasions were assessed under double blind (medication naïve) conditions after a placebo and then the testing sessions were repeated in the same (medication experienced) patients following a median period of 16.7 months of continuous dopaminergic drug therapy. Results: In the medication naïve condition, affect was not changed by L-dopa or methylphenidate and only L-dopa improved motor function. In the medication experienced condition, active drugs improved positive affect compared with the medication naïve condition and there was an enhanced effect of L-dopa on motor function. Reward responsivity was enhanced by both L-dopa and methylphenidate in medication naïve and experienced conditions. Conclusion: Sustained dopaminergic drug therapy augments the motor effects of an acute challenge with L-dopa and induces euphoriant effects to L-dopa and methylphenidate challenges.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
R Medicine > RM Therapeutics. Pharmacology
Publisher: BMJ Publishing Group
ISSN: 0022-3050
Last Modified: 04 Jun 2017 04:00
URI: http://orca.cf.ac.uk/id/eprint/30731

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