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Parkinson’s disease (PD) is the second most common neurodegenerative disease and is growing in prevalence and disability. The standard treatment for PD is oral levo-dopa (LD) with carbidopa (CD). As PD progresses, despite higher doses of LD/CD, plasma levels of LD fluctuate, and may be associated with motor fluctuations and dyskinesia. The development of two new subcutaneous preparations of LD/CD (ND0612 and ABBV-951) for the treatment of motor fluctuations in PD is described in detail. Both reduce motor fluctuations and dyskinesia with minor infusion site adverse events. A third subcutaneous preparation, DIZ102, is in early-stage development. The premise for using continuous release LD in advanced PD is that steady state levels of LD will prevent motor fluctuations/dyskinesia, but this is not the whole story, and will limit the benefits of subcutaneous continuous release LD. With its present pump system ND0612 cannot be used as monotherapy, whereas ABBV-951 can be. Having to combine with oral LD/CD will complicate the use of ND0612. Both ND0612 and ABBV-951 only cause modest reductions in OFF time. It is not clear whether these subcutaneous preparations will have more benefits than the intestinal gel, which also reduces OFF time and dyskinesia.

Continuous subcutaneous levodopa-carbidopa for the treatment of advanced Parkinson’s disease: is it an improvement on other delivery?