from Section 2: - Hypokinetic Movement Disorders
Published online by Cambridge University Press: 07 January 2025
Continuous dopaminergic stimulation aims to avoid fluctuations in plasma levels of antiparkinsonian drugs in Parkinson’s disease. There are limited possibilities for translating this concept into practice with standard oral therapies: subcutaneous infusions of apomorphine (and in the near future most probably also of levodopa) and intestinal infusions of levodopa/carbidopa (LD/CD). Both allow the maintenance of stable drug levels in blood and hence a sustained stimulation of dopamine receptors. The magnitude of the effect is more or less similar between techniques, with a reduction in OFF time, an improvement in ON time, and at least for infusions of LD/CD, documented reduction in dyskinesias. The effect is apparently greater with the intestinal and subcutaneous levodopa infusions given that they were compared with oral LD/CD in their pivotal studies whereas apomorphine was compared with placebo. As of yet, subcutaneous apomorphine and intestinal LD/CD infusions are positioned at the same level of efficacy as surgical treatment of PD and are alternatives for the treatment of patients with motor fluctuations not controlled with conventional treatment.
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