Patent No. EP2432454 (titled "Compositions For Continuous Administration Of Dopa Decarboxylase Inhibitors") was filed by Neuroderm on May 17, 2010. The application was issued on Mar 1, 2017.
Compositions for continuously delivering dopamine precursor levodopa to treat Parkinson's disease without pulsatile levodopa levels. The compositions contain a stable liquid formulation of levodopa and its decarboxylase inhibitor carbidopa, along with arginine. The arginine salt of carbidopa allows higher concentrations of both drugs in a liquid formulation. The formulation has specific ratios of levodopa:arginine:carbidopa molar ratios, pH, and stability. Continuous administration of the levodopa/carbidopa/arginine formulation along with discrete oral levodopa reduces pulsatility and improves efficacy compared to oral levodopa alone.

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